Relevant bibliographies by topics / Atolls

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Academic literature on the topic 'Atolls'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Atolls"

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Larrue, Sébastien, Jean-François Butaud, Pascal Dumas, and Stéphane Ballet. "Native plant species richness on Eastern Polynesia’s remote atolls." Progress in Physical Geography: Earth and Environment 40, no. 1 (November 30, 2015): 112–34. http://dx.doi.org/10.1177/0309133315615804.

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Which abiotic factors influence the number of native plant species on remote atolls is an important question to understand better the spatial pattern of the species observed on these low and vulnerable coral islands. However, this issue is still very poorly documented, often due to human degradation, partial botanical surveys or the difficult geographic access of remote atolls for researchers. The remote atolls of Eastern Polynesia, which are among the most isolated in the world, are of great interest for studies of native species’ distribution due to their isolation, low human density and urbanisation. In this study, we selected 49 remote atolls of Eastern Polynesia with complete botanical surveys to test the relative influence of eight abiotic factors on native plant species richness (i.e. indigenous and endemic species). Abiotic factors used as potential predictors included atoll area (km2), shoreline length (km), atoll elevation (m) and index of isolation (UNEP), but also the coastal index of the atoll ( Ic), the distance to the nearest similar atoll (km), the distance to the nearest large volcanic island ≥ 1000 km2 (here, Tahiti as a potential stepping-stone island) and the distance to the nearest raised atoll ≥ 15 m a.s.l. (here, Makatea or Henderson as a potential refugium during sea-level highstands). Spearman’s rank correlation, linear regression analysis and frequency diagrams were used to assess the relative influence of these factors on native species richness. No relationship was found between the species richness and the index of isolation or the distance to the nearest similar atoll. Atoll area and distance to the nearest raised atoll of Makatea explained 47.1% and 40%, respectively, of the native species richness variation observed on the remote atolls. The distance to the volcanic island of Tahiti and the coastal index explained 36.9% and 27.3% of the variation, while elevation and shoreline length explained 23.3% and 18.4% of the variation, respectively. Native species richness on the atolls surveyed increased with the increasing atoll area, elevation and shoreline length, but decreased with the increasing distance to the nearest raised atoll of Makatea and the large volcanic island of Tahiti. This supports the view that the spatial pattern of native species richness observed on the remote atolls was strongly influenced by (i) atoll area but also by (ii) the distance to the raised atoll of Makatea, and (iii) the distance to the volcanic island of Tahiti. This finding suggests that the raised atoll may be viewed as a refugium during sea-level highstands while the large volcanic island played the role of stepping-stone island, both islands influencing the dispersal of native species on remote atolls and attenuating the isolation effect in the study area.
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Rasheed, Shuaib, Simon C. Warder, Yves Plancherel, and Matthew D. Piggott. "Nearshore tsunami amplitudes across the Maldives archipelago due to worst-case seismic scenarios in the Indian Ocean." Natural Hazards and Earth System Sciences 24, no. 3 (March 5, 2024): 737–55. http://dx.doi.org/10.5194/nhess-24-737-2024.

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Abstract. The Maldives face the threat of tsunamis from a multitude of sources. However, the limited availability of critical data, such as bathymetry (a recurrent problem for many island nations), has meant that the impact of these threats has not been studied at an island scale. Conducting studies of tsunami propagation at the island scale but across multiple atolls is also a challenging task due to the large domain and high resolution required for modelling. Here we use a high-resolution bathymetry dataset of the Maldives archipelago, as well as corresponding high numerical model resolution, to carry out a scenario-based tsunami hazard assessment for the entire Maldives archipelago to investigate the potential impact of plausible far-field tsunamis across the Indian Ocean at the nearshore island scales across the atolls. The results indicate that the bathymetry of the atolls, which are characterized by very steep boundaries offshore, is extremely efficient in absorbing and redirecting incoming tsunami waves. Results also highlight the importance that local effects have in modulating tsunami amplitude nearshore, including the location of the atoll in question, the location of a given island within the atoll, and the distance of that island to the reef, as well as a variety of other factors. We also find that the refraction and diffraction of tsunami waves within individual atolls contribute to the maximum tsunami amplitude patterns observed across the islands in the atolls. The findings from this study contribute to a better understanding of tsunamis across complex atoll systems and will help decision and policy makers in the Maldives assess the potential impact of tsunamis across individual islands. An online tool is provided which presents users with a simple interface, allowing the wider community to browse the simulation results presented here and assess the potential impact of tsunamis at the local scale.
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Kerber, Anne U., Thomas Vogt, and Cornelia S. L. Müller. "South Sea Atolls." American Journal of Dermatopathology 37, no. 11 (November 2015): 850–51. http://dx.doi.org/10.1097/dad.0000000000000337.

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Droxler, André W., and Stéphan J. Jorry. "The Origin of Modern Atolls: Challenging Darwin's Deeply Ingrained Theory." Annual Review of Marine Science 13, no. 1 (January 3, 2021): 537–73. http://dx.doi.org/10.1146/annurev-marine-122414-034137.

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In 1842, Darwin identified three types of reefs: fringing reefs, which are directly attached to volcanic islands; barrier reefs, which are separated from volcanic islands by lagoons; and ring reefs, which enclose only a lagoon and are defined as atolls. Moreover, he linked these reef types through an evolutionary model in which an atoll is the logical end point of a subsiding volcanic edifice, as he was unaware of Quaternary glaciations. As an alternative, starting in the 1930s, several authors proposed the antecedent karst model; in this model, atolls formed as a direct interaction between subsidence and karst dissolution that occurred preferentially in the bank interiors rather than on their margins through exposure during glacial lowstands of sea level. Atolls then developed during deglacial reflooding of the glacial karstic morphologies by preferential stacked coral-reef growth along their margins. Here, a comprehensive new model is proposed, based on the antecedent karst model and well-established sea-level fluctuations during the last 5 million years, by demonstrating that most modern atolls from the Maldives Archipelago and from the tropical Pacific and southwest Indian Oceans are rooted on top of late Pliocene flat-topped banks. The volcanic basement, therefore, has had no influence on the late Quaternary development of these flat-topped banks into modern atolls. During the multiple glacial sea-level lowstands that intensified throughout the Quaternary, the tops of these banks were karstified; then, during each of the five mid-to-late Brunhes deglaciations, coral reoccupied their raised margins and grew vertically, keeping up with sea-level rise and creating the modern atolls.
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Bruyère, Oriane, Romain Le Gendre, Mathilde Chauveau, Bertrand Bourgeois, David Varillon, John Butscher, Thomas Trophime, et al. "Lagoon hydrodynamics of pearl farming atolls: the case of Raroia, Takapoto, Apataki and Takaroa (French Polynesia)." Earth System Science Data 15, no. 12 (December 8, 2023): 5553–73. http://dx.doi.org/10.5194/essd-15-5553-2023.

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Abstract. Between 2018 and 2022, four pearl farming Tuamotu atolls of French Polynesia were monitored with autonomous oceanographic instruments to measure the hydrodynamics of atoll lagoons and the ocean–lagoon water exchanges. These surveys were conducted within the framework of the ANR-funded MANA (Management of Atolls) project and its extensions to additional sites. The overarching goal was to improve knowledge on the processes influencing the spat collection of the pearl oyster Pinctada margaritifera, the oyster species used to produce black pearls. These data sets are also critical for the calibration and validation of 3D high spatial resolution hydrodynamic models used to study oyster larval dispersal within lagoons. The observational strategies focused on the characterization of ocean–lagoon exchanges through passes and hoa (i.e., shallow reef flats), lagoon circulation, incident waves breaking on the forereef, water elevation inside the lagoon as well as spatial temperature variability. Chronologically, the investigated atolls were first Raroia Atoll with 9 months of measurements between May 2018 and March 2019 during which the MALIS1 and MALIS2 cruises on-board the R/V ALIS took place. It was followed by a 4 month deployment in Takapoto Atoll (November 2021 to March 2022). In late April 2022, Apataki Atoll was instrumented until end of July, followed by Takaroa measurements between July and October 2022. Apataki (Leg2) and Takaroa Atoll were conjointly instrumented during the MALIS 3 oceanographic cruise. Altogether, those multi-atoll data bring a worldwide unique oceanographic atoll data set that is useful for addressing local pearl farming questions but potentially beneficial for other fundamental and applied investigations. Each data set was post-processed, quality controlled and converted into NetCDF format. Files are available in open source into dedicated repositories in the SEANOE marine data platform. Links (DOI) of individual data sets are provided in Table 2.
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Gaulme, François. "Les atolls du Pacifique." Études Juillet-Août, no. 7 (2017): 7. http://dx.doi.org/10.3917/etu.4240.0007.

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Martin, Tyson S. H., Rod M. Connolly, Andrew D. Olds, Daniela M. Ceccarelli, Douglas E. Fenner, Thomas A. Schlacher, and Maria Beger. "Subsistence harvesting by a small community does not substantially compromise coral reef fish assemblages." ICES Journal of Marine Science 74, no. 8 (March 28, 2017): 2191–200. http://dx.doi.org/10.1093/icesjms/fsx043.

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Abstract Fisheries usually first remove large predators before switching to smaller species, causing lasting changes to fish community structure. Reef fish provide essential protein and income for many people, and the impacts of commercial and high-intensity subsistence fishing on reef fish are well documented. However, how fish communities respond to low levels of subsistence fishing using traditional techniques (fishing for food, few fishers) is less well understood. We use three atolls in the Marshall Islands as a model system to quantify effects of commercial and subsistence fishing on reef fish communities, compared to a near-pristine baseline. Unexpectedly, fish biomass was highest on the commercially-fished atoll where the assemblage was dominated by herbivores (50% higher than other atolls) and contained few top predators (70% lower than other atolls). By contrast, fish biomass and trophic composition did not differ between pristine and subsistence-fished atolls – top predators were abundant on both. We show that in some cases, reefs can support fishing by small communities to provide food but still retain intact fish assemblages. Low-intensity subsistence fishing may not always harm marine food webs, and we suggest that its effects depend on the style and intensity of fishing practised and the type of organisms targeted.
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Poteate, Aaron S., Scott M. Fitzpatrick, William S. Ayres, and Adam Thompson. "First Radiocarbon Chronology for Mwoakilloa (Mokil) Atoll, Eastern Caroline Islands, Micronesia." Radiocarbon 58, no. 1 (January 19, 2016): 169–78. http://dx.doi.org/10.1017/rdc.2015.16.

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AbstractGiven their sheer number and evidence for long-term prehistoric occupation, atolls occupy a unique position in the peopling of the Pacific. However, they have frequently been overlooked in favor of larger islands due to a host of logistical and other issues. Once viewed as marginal environments, current research is now showing that small islands like these may have been more attractive to settlers than once thought. A new research program in Micronesia is dedicated to examining atolls to better develop baseline chronologies and investigate long-term human adaptations. As part of the initial stage of the project, we present the first radiocarbon dates (n=10) from Mwoakilloa (Mokil) atoll, which support a continuous occupation beginning between 1700–1560 cal BP (2σ). When compared to the settlement of other atoll groups in Micronesia such as the Marshall Islands—along with the nearby high volcanic islands of Pohnpei and Kosrae at approximately 2000–1800 yr ago—the dates from Mwoakilloa suggest a nearly contemporaneous or only slightly later occupation. The recovery of faunal material also demonstrates the translocation of at least two animals (Pacific rat and dog) to the island by humans that was coeval with early settlement. Additionally, there is evidence of landscape transformation in the form of a relatively large artificial mound created by debris and platform accumulation unseen elsewhere in central-eastern Micronesia, but common to atolls. These new dates reinforce the notion that Mwoakilloa and other atolls are integral to understanding prehistoric adaptations across the vast Pacific, though many questions still remain such as to the degree of interaction that occurred with nearby islands and whether settlement was continuous or intermittent through time.
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Dale, Jonathan J., Carl G. Meyer, and Christian E. Clark. "The Ecology of Coral Reef Top Predators in the Papahānaumokuākea Marine National Monument." Journal of Marine Biology 2011 (2011): 1–14. http://dx.doi.org/10.1155/2011/725602.

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Coral reef habitats in the Papahānaumokuākea Marine National Monument (PMNM) are characterized by abundant top-level predators such as sharks and jacks. The predator assemblage is dominated both numerically and in biomass by giant trevally (Caranx ignobilis) and Galapagos sharks (Carcharhinus galapagensis). A lower diversity of predatory teleosts, particularly groupers and snappers, distinguishes the PMNM from other remote, unfished atolls in the Pacific. Most coral reef top predators are site attached to a “home” atoll, but move extensively within these atolls. Abundances of the most common sharks and jacks are highest in atoll fore reef habitats. Top predators within the PMNM forage on a diverse range of prey and exert top-down control over shallow-water reef fish assemblages. Ecological models suggest ecosystem processes may be most impacted by top predators through indirect effects of predation. Knowledge gaps are identified to guide future studies of top predators in the PMNM.
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Orpin, Alan R., Graham J. Rickard, Peter K. Gerring, and Geoffroy Lamarche. "Tsunami hazard potential for the equatorial southwestern Pacific atolls of Tokelau from scenario-based simulations." Natural Hazards and Earth System Sciences 16, no. 5 (May 31, 2016): 1239–57. http://dx.doi.org/10.5194/nhess-16-1239-2016.

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Abstract. Devastating tsunami over the last decade have significantly heightened awareness of the potential consequences and vulnerability of low-lying Pacific islands and coastal regions. Our appraisal of the potential tsunami hazard for the atolls of the Tokelau Islands is based on a tsunami source–propagation–inundation model using Gerris Flow Solver, adapted from the companion study by Lamarche et al. (2015) for the islands of Wallis and Futuna. We assess whether there is potential for tsunami flooding on any of the village islets from a selection of 14 earthquake-source experiments. These earthquake sources are primarily based on the largest Pacific earthquakes of Mw ≥ 8.1 since 1950 and other large credible sources of tsunami that may impact Tokelau. Earthquake-source location and moment magnitude are related to tsunami-wave amplitudes and tsunami flood depths simulated for each of the three atolls of Tokelau. This approach yields instructive results for a community advisory but is not intended to be fully deterministic. Rather, the underlying aim is to identify credible sources that present the greatest potential to trigger an emergency response. Results from our modelling show that wave fields are channelled by the bathymetry of the Pacific basin in such a way that the swathes of the highest waves sweep immediately northeast of the Tokelau Islands. Our limited simulations suggest that trans-Pacific tsunami from distant earthquake sources to the north of Tokelau pose the most significant inundation threat. In particular, our assumed worst-case scenario for the Kuril Trench generated maximum modelled-wave amplitudes in excess of 1 m, which may last a few hours and include several wave trains. Other sources can impact specific sectors of the atolls, particularly distant earthquakes from Chile and Peru, and regional earthquake sources to the south. Flooding is dependent on the wave orientation and direct alignment to the incoming tsunami. Our "worst-case" tsunami simulations of the Tokelau Islands suggest that dry areas remain around the villages, which are typically built on a high islet. Consistent with the oral history of little or no perceived tsunami threat, simulations from the recent Tohoku and Chile earthquake sources suggest only limited flooding around low-lying islets of the atoll. Where potential tsunami flooding is inferred from the modelling, recommended minimum evacuation heights above local sea level are compiled, with particular attention paid to variations in tsunami flood depth around the atolls, subdivided into directional quadrants around each atoll. However, complex wave behaviours around the atolls, islets, tidal channels and within the lagoons are also observed in our simulations. Wave amplitudes within the lagoons may exceed 50 cm, increasing any inundation and potential hazards on the inner shoreline of the atolls, which in turn may influence evacuation strategies. Our study shows that indicative simulation studies can be achieved even with only basic field information. In part, this is due to the spatially and vertically limited topography of the atoll, short reef flat and steep seaward bathymetry, and the simple depth profile of the lagoon bathymetry.
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Dissertations / Theses on the topic "Atolls"

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Wilson, Paul Alastair. "The evolution of Cretaceous Pacific Ocean guyots." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363102.

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Yarina, Elizabeth. "Post-island futures : seeding territory for Tuvalu's fluid atolls." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106363.

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Thesis: M. Arch., Massachusetts Institute of Technology, Department of Architecture, 2016.
Thesis: M.C.P, Massachusetts Institute of Technology, Department of Urban Studies and Planning, 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 303-309).
The atoll nation of Tuvalu lies only a few meters above the seas of the equatorial Pacific, and is at high risk for inundation and storm surges due to climate change. However, in spite of the media narrative of "sinking" Tuvalu, when understood in broader contexts of time and space, the existence of atolls is highly temporal and dynamic, based on sediment hydrodynamics and coral reef production. The designation of Tuvalu as a 'nation' is also a narrow temporal framing, of colonial origin. The inhabitants of Tuvalu's atolls were historically highly mobile peoples, moving from island to island in response to resource or social concerns. Tuvaluans today continue to be mobile peoples, migrating between atolls and globally, but this movement is now limited by global territorial sanctions. Climate change creates the risk of uncertain territory and uncertain identity for Tuvaluans; the submergence of the islands below mean sea level threatens rights to their territorial waters (EEZ) as well as their nationhood status as they lose the space to practice their cultural identity. The modern nation-state views its contents (population and geography) as relatively static. The inherently fluid nature of these components in Tuvalu, further amplified by climate change, problematizes the hard lines of territory and state drawn sharply in the contemporary era. When both ground and people are acknowledged as fluid entities, how might we re-imagine the spatial and social form of the Tuvaluan nation? How can Tuvalu continue to exert territorial claims when both the subject and object of nationhood are in flux? And how can Tuvalu's spatially oriented cultural identity be maintained as its population becomes increasingly mobile? Instead of ceding territory to the rising waters of climate change, this thesis posits 'seeding' territory as an alternative. The project explores the propagation of the architectural 'seed' as a way to 'grow' territory in the context of migratory populations and unstable geographies. The seeds consider territory both in the sense of transnational legislation (per the UN Law of the Seas) but also in the cultural sense of Tuvaluans, as a collective space of shared resources and identity. The seeds generate physical territory and facilitate social networks and identities. The design of these seeds is then conceptually tested in future social and environmental scenarios both for both the in- and ex- situ nation.
by Elizabeth Yarina.
M. Arch.
M.C.P
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Poupet, Pascal. "Géochimie organique et biogéochimie de sédiments de lagon des atolls de Tikehau et Takapoto (Polynésie française)." Orléans, 1989. http://www.theses.fr/1989ORLE2052.

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Un compartiment important de la matière organique sédimentaire correspond aux trames protéiques contenues dans les grains de carbonate biogénique, caractérisées par leur richesse en acide aspartique. On ne perçoit pas l'effet de la sédimentation à partir des débris de la production planctonique, pourtant considérable. La dégradation et la consommation de ces particules à l'interface eau-sédiment est donc extrêmement rapide avant même l'enfouissement. Un autre compartiment est reconnu dans la matière organique sédimentaire grâce aux lipides biomarqueurs : il trouve sa source dans les algues benthiques, ce qui confirme l'indépendance reconnue entre les domaines planctonique et benthique. L'abondance des biomarqueurs algaires diminue en profondeur dans le sédiment : cette dégradation est liée à la consommation de la matière organique par la faune dans les sables grossiers, et par les bactéries dans les sédiments fins. L'analyse des biomarqueurs dans les lagons d'atolls étudiés a ainsi permis de désigner les sources des matières organiques sédimentaires, et l'influence de certains critères d'environnement sur les modalités de leur répartition et de leur dégradation
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Leca, Sauze Lucette. "Etude des epibiontes associes a l'huitre perliere. Pinctada margaritifera (l) var. Cumingii (jameson) dans deux atolls de polynesie francaise." Pacifique, 1993. http://www.theses.fr/1993PACI0002.

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En polynesie francaise, une recrudescence du taux d'epibiontes affectant les huitres perlieres a ete signalee dans plusieurs atolls, apres les cyclones de 1983 et les mortalites massives de 1985. Les investigations sur les biosalissures ou biofouling affectant l'huitre perliere pinctada margaritifera (linne, 1758) variete cumingii (jameson), rapportees dans cette etude, ont ete menees, dans le lagon de l'atoll de takapoto et dans celui de takaroa, du mois de mars 1990 au mois de mars 1991. Des huitres perlieres vivantes, sauvages et de culture, ainsi que des substrats artificiels constituent l'habitat des biosalissures dont l'etablissement et le developpement ont ete compares. La nature de ces epibiontes, l'intensite de la colonisation a differentes profondeurs, dans un meme milieu et dans deux lagons voisins mais dissemblables, le moment d'apparition et les periodes d'abondance de ces organismes ont ete etudies. 67 especes d'algues dont 21 cyanophycees, 25 rhodophycees, 14 chlorophycees et 7 pheophycees, ont ete recensees. Les cyanophycees et deux rhodophycees, polysiphonia et tiffaniella sont les plus frequentes. 46 especes animales ont ete repertoriees. Les groupes les plus representes sont les mollusques, les lophophoriens et les tuniciers. Les resultats de 1989 ont montre que le milieu naturel de takapoto etait plus favorable a la richesse generique de la flore algale du biofouling que l'environnement des fermes d'elevage. Il semble que l'on assiste, en 1990, a une estompe des differences, dues a la forte regression des rhodophycees sur les nacres sauvages. Il ressort aussi de cette etude dans le milieu naturel, comme dans celui des fermes, les epibiontes vegetaux sont plus diversifies a takaroa qu'a takapoto, en 1990. Un gradient qualitatif des epibiontes selon la bathymetrie a ete observe. Les tuniciers sont abondants aux faibles niveaux (1-4 m), les mollusques et les spongiaires, aux niveaux moyens (5-6 m) et les bryozoaires vers 9-10 m. Dans la succession ecologique, les spongiaires sont associes aux microphytes des le debut de la colonisation. Les tuniciers et les mollusques sont plus tardifs. Vers 2 mois les trois groupes sont presents ensemble mais ils regressent spontanement vers 5 mois. Enfin ces resultats ont aussi permis de constater des differences entre supports vivants et inertes. Les frequences algales et animales sont plus importantes sur les huitres que sur les carreaux de ceramique. Cependant les differences, peu significatives, montrent que les experimentations sur ce type de supports pourraient permettre d'economiser du materiel vivant pour la poursuite de recherches dans ce domaine
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Rufin-Soler, Caroline. "Evolutions environnementales des littoraux des atolls coralliens dans les océans Indien et Pacifique : le cas des archipels Maldivien et Tuvaluan." Phd thesis, Université de Bretagne occidentale - Brest, 2004. http://tel.archives-ouvertes.fr/tel-00409568.

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Les objectifs de ma thèse étaient de déterminer, d'une part, les causes naturelles et humaines responsables de la vulnérabilité des territoires atolliens et, d'autre part, d'estimer leur devenir dans la perspective d'une élévation du niveau de la mer et de changements climatiques. L'estimation de l'évolution future de ces territoires constituait un enjeu économique fondamental en raison de la concentration des activités et des populations sur ces espaces exigus.
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Jehl, Caroline. "Les mattes algaires cyanobactériennes, Kopara, des atolls des Tuamootu : biochimie, productivité et signification écologique : insertion dans un modèle de phosphatogenèse." Pacifique, 1995. http://www.theses.fr/1995PACI0010.

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Ebren, Philippe. "Impact des variations rapides du niveau marin sur le développement des atolls au quaternaire : Mururoa (Polynésie française). Dynamique récifale et diagenèse des carbonates." Aix-Marseille 1, 1996. http://www.theses.fr/1996AIX11079.

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L'etude de forages provenant de la couronne recifale de l'atoll de mururoa permet de reconstituer les etapes de l'edification recifale depuis 450 000 ans. L'examen des assemblages biologiques permet de caracteriser les paleoenvironnements et de determiner les paleobathymetries de croissance pour chacune des unites recifales. L'etude diagenetique et geochimique (isotopes stables ; elements traces) des carbonates met en evidence 6 periodes d'emersion, avec localement des temoins de pedogenese. Par ailleurs, les ciments marins et meteoriques ont ete caracterises aux plans petrographique et geochimique. Cette double approche, completee par l'analyse de diagraphies, permet ainsi de hierarchiser et de localiser les discontinuites. Les datations u/th obtenues permettent d'etablir un canevas chronologique precis: - 6 periodes de haut niveau marin relatif (stades isotopiques 1, 5. 5, 7, 9, 11 et 13) au cours desquels le niveau marin s'est etabli entre +4 et +9m a 123,5 ka, vers -30 m a 334 ka et entre -25 et -40 m a 451 ka par rapport au niveau marin actuel. Au cours du stade 7 (234 ka), le niveau etait situe a un niveau comparable au niveau actuel. Au cours de l'holocene, la croissance recifale actuelle a debute vers 8500 ans. - 3 periodes de bas niveau marin relatif (stades isotopiques 2 ( 20 ka), 4 ( 70 ka) et 8 ( 270 ka) au cours desquels le niveau marin etait situe respectivement vers 135 / 150 m, 70/80 m et 80/85 m sous le niveau marin actuel. Les stades isotopiques 10 ( 350 ka) et 12 ( 450 ka) n'ont pas ete dates directement, mais ont pu etre geometriquement deduits. Un modele de structuration dynamique des flancs de l'atoll est etabli a partir de l'agencement des differentes edifices recifaux et de leur chronologie, des paleoenvironnements impliques, des donnees sedimentologiques. Ce modele montre la predominance des mecanismes d'aggradation lors des periodes de haut niveau marin et d'accretion laterale associee au demantelement des edifices recifaux preexistants et la formation concomittante de talus lors des phases de bas niveau marin
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Zuliani, Alexandre. "Vers la manipulation optique d'atomes ultra-froids d'ytterbium excités dans des états de Rydberg." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS141/document.

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Les propriétés exacerbées des atomes de Rydberg ont permis d'étendre les possibilités offertes par les atomes froids dans la création de gaz d'atomes en très forte interaction, avec des applications notamment en simulations quantiques, dans la physique à N corps ou dans la réalisation de portes quantiques grâce au phénomène de blocage dipolaire. L'utilisation des atomes de Rydberg froids est cependant actuellement limitée par le fait qu'il n'est pas possible de continuer d'appliquer les techniques expérimentales de manipulation optique avec les atomes à un électron actif. L’attention de la communauté des atomes de Rydberg froids s’est donc récemment portée sur les atomes à deux électrons actifs qui offrent la possibilités, une fois l’un des deux électrons excité vers un état de Rydberg, de disposer d’un second électron optiquement actif qu’il va être possible de manipuler par laser. L’objectif de cette thèse est d’étendre les techniques de manipulation optique aux atomes à deux électrons actifs excités dans des états de Rydberg, dans le cas de l’atome d’ytterbium. Elle présente d’une part la conception et l’assemblage du dispositif expérimental permettant l’obtention d’une source d’atomes de Rydberg froids d’ytterbium. A terme, ce montage permettra la manipulation optique de ces atomes de Rydberg. D’autre part, elle présente le développement d’un modèle numérique implémentant la théorie du défaut quantique à plusieurs voies pour permettre la détermination théorique du spectre énergétique de l’ytterbium ainsi que son comportement sous l’effet de perturbations extérieures
The exacerbated properties of Rydberg atoms have extended the possibilities offered by cold atoms in creating atomic gases in very strong interaction with applications including quantum simulations in many-body physics or in achieving of quantum gates with the dipole blocking phenomenon. The use of cold Rydberg atoms is however currently limited by the fact that it is not possible to continue to apply the experimental techniques of optical manipulation with the atoms to an active electron. The attention of the Rydberg atoms cold community is recently focused on the two active electron atoms offering possibilities, once one of the two electrons excited to a Rydberg state, to provide a second optically active electron that it will be possible to manipulate with laser light.The objective of this thesis is to extend the optical manipulation techniques to atoms with two active electrons excited in Rydberg states, in the case of the ytterbium atom. It has on the one hand the design and assembly of the experimental apparatus for obtaining a source of cold Rydberg ytterbium atoms. Ultimately, this device will allow the optical manipulation of these Rydberg atoms. Furthermore, it presents the development of a numerical model that implements the multichannel quantum defect theory to the theoretical determination of the energy spectrum of ytterbium and its behavior under the influence of external perturbations
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Pillet, Valentin. "Détection et attribution des changements morphologiques côtiers récents en milieu insulaire tropical (Polynésie française, Caraïbe)." Thesis, La Rochelle, 2020. http://www.theses.fr/2020LAROS019.

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Les îles coralliennes d’atolls et les zones basses des îles hautes tropicales sont considérées comme comptant parmi les territoires les plus vulnérables aux impacts des événements météo-marins extrêmes et aux conséquences attendues du changement climatique. Néanmoins, alors que les littoraux métropolitains ont bénéficié d’un effort significatif d’évaluation de leurs évolutions passées de long terme, les espaces insulaires tropicaux ultramarins sont les moins documentés à l’échelle du territoire français. Partant de ce constat, cette thèse propose d’investiguer le rôle des facteurs météo-marins (cyclones, houles) et anthropiques (rigidification du trait de côte, remblaiement) dans les évolutions passées d’îles coralliennes d’atolls de Polynésie française et de plages d’îles hautes du nord des Petites Antilles.Ces travaux se basent sur un protocole méthodologique couplant l’apport de la géomatique et de la photo-interprétation assistée par ordinateur et des relevés réalisés sur les terrains étudiés. À partir d’une analyse multiscalaire (spatiale et temporelle), ils détectent et attribuent les évolutions planimétriques qu’ont connues les systèmes sédimentaires côtiers des îles étudiées. Les résultats obtenus sur les îles coralliennes abondent dans le sens des études antérieures qui établissaient que la majorité des îles a été stable ou en extension à l’échelle des dernières décennies. Ils permettent de proposer des modèles conceptuels de trajectoires d’évolutions pluridécennales et interrogent les contributions respectives des différents facteurs d’évolution considérés. Sur les plages des îles hautes, ces travaux mettent en évidence que les caractéristiques locales des sites étudiés expliquent la très forte variabilité longitudinale des évolutions détectées dans différents contextes météo-marins. Au-delà, ces travaux contribuent à alimenter l’échantillon mondial d’îles étudiées à ce jour et participent à enrichir la connaissance sur les évolutions passées des outremers insulaires français
Low-lying reef islands and coastal areas of tropical mountainous islands are highly vulnerable to the impacts of tropical cyclones and the expected effects of climate change. However, while the French metropolitan coasts have benefited from a significant effort to assess their long-term changes, French overseas islands are the least documented areas in French Territory. Based on this observation, this thesis examines the respective contribution of natural and anthropogenic drivers in the past evolution of reef islands (French Polynesia) and mountainous island beaches (Northern Lesser Antilles). This study relies on a combined approach between geomatic and fieldwork. From a multi-scalar (spatial and temporal) analysis, we detect and attribute the planimetric changes experienced by the sedimentary systems of the studied islands. Results on reef islands are comparable to those of previous studies which established that most of the islands have been stable or in expansion over the last decades. They allow to suggest conceptual models of long-term trajectories and examine the respective contribution of the drivers considered in this study. On mountainous island beaches, this study shows that local settings explain the high longitudinal variability detected in various climatic situations. In addition, this study contributes to the global samples of studied islands and to move forward on the understanding of past coastal changes in French overseas islands
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Lehec, Henri. "Spectroscopie Rydberg et excitation du coeur isolé d'atomes d'ytterbium ultra-froids." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS566/document.

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Les atomes de Rydberg constituent des objets idéaux pour l’étude des systèmes physiques en interaction à longue portée. Transposer à ces atomes très excités les techniques habituelles d’imagerie et de piegeage des atomes froids offrirait de nouvelles opportunités pour le domaine de la simulation quantique. Notre approche consiste à utiliser un atome à deux électrons de valence optiquement actifs tel que l’ytterbium. En effet, les transitions optiques du coeur ionique de cet atome ouvrent la voie à de nombreuses perspectives pour la manipulation optique dans l'état de Rydberg. Lorsque l’atome est doublement excité, il peut néanmoins auto-ioniser puisque son énergie se situe au delà de la première limite d’ionisation. La possibilité de s’affranchir totalement de l’autoionisation est une question ouverte.Dans cette thèse, nous présentons en premier lieu les contributions apportées au montage de l’expérience,du refroidissement des atomes d’ytterbium sur la raie d’intercombinaison à l’excitation dans des états de Rydberg. A cause des interactions entre électrons de valence, la spectroscopie de ces états très excités est plus complexe dans l'ytterbium que dans les atomes alcalins. Une étude expérimentale couplée à une analyse par théorie du défaut quantique à plusieurs voies (MQDT) a été réalisée sur diverses séries Rydberg (s, p, d et f). Cette étude, prérequis essentiel, a permis d’améliorer la précision de plus de deux ordres de grandeur sur la spectroscopie des séries étudiées.L’excitation du coeur ionique a ensuite été mise en place sur la transition 6s1/2 → 6p1/2 . Nous avons alors étudié expérimentalement et théoriquement l’excitation du coeur isolé pour des états de Rydberg de grand moment orbital (l = 5 - 9). Cette étude a montré que l'auto-ionisation est dominée par le couplage au continuum de l'état de coeur 5d3/2. Par opposition a l'atome de baryum, pour lequel l'autoionisation chute rapidement avec le moment orbital de l'électron Rydberg, nous avons montré que cette tendance est moins marquée sur l'ytterbium. Grace à cette étude, nous pourrons déterminer les états pour lesquels la manipulation optique par laser est possible
Rydberg atoms offer an ideal platform for the study of long-range interacting systems.However, usual techniques for imaging and trapping are unavailable in alkali Rydberg atoms. Our approach rely on the use of a two-optically-active-valence-electrons atom such as ytterbium. Ionic core transitions of this atom offer new perspecives for optical manipulation in the Rydberg state. However,questions remain open, especially on the possibilities of avoiding the autoionization, process which occurs when the atom is doubly excited.In this thesis, we report on the construction of the experiment, from the cooling and trapping of theatoms to the excitation in Rydberg states. Because of the interactions between valence electrons, the spectroscopy of these highly excited states is relatively complicated. An experimental study, coupled to a multi-channel quantum defect analysis (MQDT) has been done on the s,p,d and f Rydberg series. This study produced an improvement on the precision of the spectroscopy of this series by more than two orders of magnitude. We then studied the isolated core excitationon the 6s1/2 -> 6p1/2 transition for Rydberg states of large orbital quantum numbers (l=5-9). This study showed that auto-ionisation is mostly due to the coupling to the continuum of the 5d3/2 core state. In opposition to the barium atom, where auto-ionisation drops rapidly with the orbital quantum number, we have shown that ytterbium is less favourable to that extent. Thanks to this study we will be able to determine which states are good candidates for the optical manipulation
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Books on the topic "Atolls"

1

Montenars, Gilles de. Atolls sanglants: Roman. Pirae, Tahiti: Au Vent des îles, 1998.

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Keating, Barbara H., Patricia Fryer, Rodey Batiza, and George W. Boehlert, eds. Seamounts, Islands, and Atolls. Washington, D. C.: American Geophysical Union, 1987. http://dx.doi.org/10.1029/gm043.

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H, Keating Barbara, ed. Seamounts, islands, and atolls. Washington, D.C: American Geophysical Union, 1987.

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S, Kornicker Louis. Myodocopid Ostracoda of Enewetak and Bikini atolls. Washington, D.C: Smithsonian Institution Press, 1991.

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Company, Marshall Energy, United Nations Development Programme, and South Pacific Applied Geoscience Commission, eds. Biofuel electrification on remote atolls in the Marshall Islands. Majuro: [Government of RMI, 2007.

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G, Guille, ed. Les atolls de Mururoa et de Fangataufa (Polynésie française). Paris: Masson, 1993.

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South Pacific Applied Geoscience Commission. Biofuel electrification on remote atolls in the Marshall Islands. Suva, Fiji?: SOPAC?, 2006.

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Terry, James P. The Marshall Islands: Environment, history and society in the atolls. Suva, Fiji: University of the South Pacific, Faculty of Islands and Oceans, 2008.

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Bunce, Pauline. The Cocos (Keeling) Islands: Australian atolls in the Indian Ocean. Milton, Qld: Jacaranda Press, 1988.

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1967-, Terry James P., and Thomas Frank R. 1962-, eds. The Marshall Islands: Environment, history and society in the atolls. Suva, Fiji: University of the South Pacific, Faculty of Islands and Oceans, 2008.

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Book chapters on the topic "Atolls"

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Hopley, David. "Atolls." In Encyclopedia of Earth Sciences Series, 146–47. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_22.

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Hopley, David. "Atolls." In Encyclopedia of Earth Sciences Series, 1–3. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-48657-4_22-2.

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Woodroffe, Colin D., and Naomi Biribo. "Atolls." In Encyclopedia of Modern Coral Reefs, 51–71. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2639-2_4.

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Goldberg, Walter M., and Eugene C. Rankey. "The Atolls of Fiji." In A Global Atlas of Atolls, 239–59. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003287339-15.

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Goldberg, Walter M., and Eugene C. Rankey. "The Atolls of Kiribati." In A Global Atlas of Atolls, 115–41. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003287339-9.

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Goldberg, Walter M., and Eugene C. Rankey. "The Atolls of Indonesia." In A Global Atlas of Atolls, 287–312. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003287339-18.

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Goldberg, Walter M., and Eugene C. Rankey. "The Atolls of Tokelau." In A Global Atlas of Atolls, 101–4. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003287339-7.

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Goldberg, Walter M., and Eugene C. Rankey. "The Atolls of Tuvalu." In A Global Atlas of Atolls, 105–13. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003287339-8.

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Nunn, Patrick D. "Pacific Atolls: A World Apart." In Geomorphological Landscapes of the World, 349–56. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3055-9_36.

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Goldberg, Walter M., and Eugene C. Rankey. "A Global Atlas of Atolls." In A Global Atlas of Atolls, 1–24. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003287339-1.

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Conference papers on the topic "Atolls"

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R. Syversveen, A. "Modeling Atolls by Truncated Gaussian Simulation." In EAGE Conference on Petroleum Geostatistics. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609.201403101.

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Erra, Ugo, Giuseppe Scanniello, and Maria Caulo. "Software Systems as Archipelagos of Atolls." In 2015 19th International Conference on Information Visualisation (iV). IEEE, 2015. http://dx.doi.org/10.1109/iv.2015.39.

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Droxler, André W., and Stéphan J. Jorry. "THE ORIGIN OF MODERN ATOLLS: CHALLENGING DARWIN’S DEEPLY INGRAINED THEORY." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357864.

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Puzone, Vittoria, Diana Di Luccio, Maurizio Migliaccio, and Guido Benassai. "Satellite observations and in-situ measurements to monitor Maldivian atolls over time." In 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE, 2022. http://dx.doi.org/10.1109/metrosea55331.2022.9950837.

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White, Ian, Tony Falkland, and Farran Redfern. "SEA SURFACE TEMPERATURES IN THE NINO REGIONS AND ANNUAL PRECIPITATION IN EQUATORIAL PACIFIC ATOLLS." In 19th Annual Meeting of the Asia Oceania Geosciences Society (AOGS 2022). WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811275449_0028.

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Higgs, Roger. "PACIFIC ATOLLS: SEDIMENTOLOGICAL DISCOVERIES IN ENIGMATIC 'CONGLOMERATE PLATFORM' SUPPORT HOLOCENE RAPID METER-SCALE SEA-LEVEL OSCILLATION AND TSUNAMI DEPOSITION." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-377547.

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Naidu, Som, Dhiraj Bhartu, and Tony Mays. "Access to ICT Infrastructure and Devices in the South Pacific." In Tenth Pan-Commonwealth Forum on Open Learning. Commonwealth of Learning, 2022. http://dx.doi.org/10.56059/pcf10.3503.

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The South Pacific region spreads over more than 30 million square kilometres of the Pacific Ocean. The region comprises more than a dozen island nations ranging from small volcanic islands to even smaller coral atolls. Population masses in the island nations vary from around 2,000 in Tokelau to a little more than 800,000 in the Republic of Fiji. Access to information and communications technologies and internet connectivity in the region is varied. This project involves the design and conduct of a desktop study into access to ICT infrastructure, connectivity and devices and their use by students and teachers in the Pacific. Outcomes of this study will enable COL to make informed decisions about what access and delivery technologies to employ in the Partnership for Open Distance and Flexible Learning project in the Pacific. The study will address issues of access to hardware, software, connectivity and skills, as well as examples of ways in which teachers, institutions or Ministries have found ways to address the challenges in low bandwidth/limited access environments, especially in the nine developing countries of the Commonwealth in the region.
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Navarro, Luis Daniel Benavides, Christa Schwanninger, Robert Sobotzik, and Mario Südholt. "ATOLL." In the 6th workshop. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1233901.1233908.

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Singhvi, Arjun, Arjun Balasubramanian, Kevin Houck, Mohammed Danish Shaikh, Shivaram Venkataraman, and Aditya Akella. "Atoll." In SoCC '21: ACM Symposium on Cloud Computing. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3472883.3486981.

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Garrec, P. "Magic atols." In IET Waveform Diversity & Digital Radar Conference 2008. Day 2: From Active Modules to Digital Radar. IET, 2008. http://dx.doi.org/10.1049/ic.2008.0751.

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Reports on the topic "Atolls"

1

Meade, Roger. The Forgotten Marshallese of Wotho, Rongelap, and Utirik Atolls. Office of Scientific and Technical Information (OSTI), May 2024. http://dx.doi.org/10.2172/2372648.

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Stuart, M. L. Collection and processing of plant, animal and soil samples from Bikini, Enewetak and Rongelap Atolls. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/123222.

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Hamilton, T. F., S. R. Kehl, R. M. Berry, and R. M. Martinelli. Tobolar briefing: The resource potential of Copra collected from nuclear affected atolls in the northern Marshall Islands. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1389953.

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Hamilton, T. F. Radiological Conditions on Rongelap Atoll: Perspective on Resettlement of Rongelap Atoll. Office of Scientific and Technical Information (OSTI), February 2003. http://dx.doi.org/10.2172/15003848.

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Robison, W., C. Conrado, and K. Bogen. Utirik Atoll Dose Assessment. Office of Scientific and Technical Information (OSTI), October 1999. http://dx.doi.org/10.2172/791658.

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Hamilton, T. F. Radiological Conditions on Rongelap Atoll: Diving and Fishing on and Around Rongelap Atoll. Office of Scientific and Technical Information (OSTI), February 2003. http://dx.doi.org/10.2172/15003849.

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Stone, E., L. Migvar, and W. Robison. Growing plants on atoll soils. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/756838.

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Robison, W. L. Current radiological status of Utirik Atoll. Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/3614.

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Novichkova, Tatiana. Political administrative map of Midway Atoll. Edited by Nikolay Komedchikov and Alexand Khropov. Entsiklopediya, September 2012. http://dx.doi.org/10.15356/dm2016-02-12-7.

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Hamliton, T. F. Radiologoical Conditions on Rongelap Atoll: Recommendations for Visiting and Food Gathering on the Norhtern Islands of Rongelap Atoll. Office of Scientific and Technical Information (OSTI), February 2003. http://dx.doi.org/10.2172/15003850.

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