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Relevant bibliographies by topics / Milankovitch Cycle

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Academic literature on the topic 'Milankovitch Cycle'

Author: Grafiati

Published: 7 June 2025

Last updated: 9 July 2025

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Journal articles on the topic "Milankovitch Cycle"

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de Winter, N. J., C. Zeeden, and F. J. Hilgen. "Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous Greenhouse world." Climate of the Past Discussions 9, no. 4 (2013): 4475–98. http://dx.doi.org/10.5194/cpd-9-4475-2013.

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Abstract. Deep marine successions of early Campanian age from DSDP site 516F drilled at low paleolatitudes in the South Atlantic reveal distinct sub-Milankovitch variability in addition to precession and eccentricity related variations. Elemental abundance ratios point to a similar climatic origin for these variations and exclude a quadripartite structure – as observed in the Mediterranean Neogene – of the precession related cycles as an explanation for the inferred semi-precession cyclicity in MS. However, the semi-precession cycle itself is likely an artifact, reflecting the first harmonic of the precession signal. The sub-Milankovitch variability is best approximated by a ~ 7 kyr cycle as shown by spectral analysis and bandpass filtering. The presence of sub-Milankovitch cycles with a period similar to that of Heinrich events of the last glacial cycle is consistent with linking the latter to low-latitude climate change caused by a non-linear response to precession induced variations in insolation between the tropics.

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de Winter, N. J., C. Zeeden, and F. J. Hilgen. "Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous greenhouse world." Climate of the Past 10, no. 3 (2014): 1001–15. http://dx.doi.org/10.5194/cp-10-1001-2014.

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Abstract. Deep marine successions of early Campanian age from DSDP (Deep Sea Drilling Project) site 516F drilled at low paleolatitudes in the South Atlantic reveal distinct sub-Milankovitch variability in addition to precession, obliquity and eccentricity-related variations. Elemental abundance ratios point to a similar climatic origin for these variations and exclude a quadripartite structure as an explanation for the inferred semi-precession cyclicity in the magnetic susceptibility (MS) signal as observed in the Mediterranean Neogene for precession-related cycles. However, semi-precession cycles as suggested by previous work are likely an artifact reflecting the first harmonic of the precession signal. The sub-Milankovitch variability, especially in MS, is best approximated by a ~7 kyr cycle as shown by spectral analysis and bandpass filtering. The presence of sub-Milankovitch cycles with a period similar to that of Heinrich events of the last glacial cycle is consistent with linking the latter to low-latitude climate change caused by a non-linear response to precession-induced variations in insolation between the tropics.

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Heesterman, Aart. "Human Interference with the Earth Has Abolished the Next Ice Age but Overdosing with Carbon Dioxide Emissions Could Have Catastrophic Consequences." Advances in Environmental and Engineering Research 03, no. 04 (2022): 1–11. http://dx.doi.org/10.21926/aeer.2204046.

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Around 1600 AD the carbon dioxide content of the earth’s atmosphere started to rise, even whilst according to the Milankovitch [1] astronomical theory of climate variation it was due to fall. On the natural earth the carbon dioxide count of the atmosphere is a delayed response and an enhancing feedback on the basic cause of the Milankovitch astronomical cycle, the intensity of the June sunshine. If the Milankovitch cycle had continued its natural course, the medevial cold period known as the little ice age. Human interference with the earth has abolished or delayed the next ice age but overdosing with carbon dioxide emissions could have catastrophic consequences.

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Ganopolski, Andrey. "Toward generalized Milankovitch theory (GMT)." Climate of the Past 20, no. 1 (2024): 151–85. http://dx.doi.org/10.5194/cp-20-151-2024.

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Abstract. In recent decades, numerous paleoclimate records and results of model simulations have provided strong support for the astronomical theory of Quaternary glacial cycles formulated in its modern form by Milutin Milankovitch. At the same time, new findings have revealed that the classical Milankovitch theory is unable to explain a number of important facts, such as the change in the dominant periodicity of glacial cycles from 41 to 100 kyr about 1 million years ago. This transition was also accompanied by an increase in the amplitude and asymmetry of the glacial cycles. Here, based on the results of a hierarchy of models and data analysis, a framework of the extended (generalized) version of the Milankovitch theory is presented. To illustrate the main elements of this theory, a simple conceptual model of glacial cycles was developed using the results of an Earth system model, CLIMBER-2. This conceptual model explicitly assumes the multistability of the climate–cryosphere system and the instability of the “supercritical” ice sheets. Using this model, it is shown that Quaternary glacial cycles can be successfully reproduced as the strongly nonlinear response of the Earth system to the orbital forcing, where 100 kyr cyclicity originates from the phase locking of the precession and obliquity-forced glacial cycles to the corresponding eccentricity cycle. The eccentricity influences glacial cycles solely through its amplitude modulation of the precession component of orbital forcing, while the long timescale of the late Quaternary glacial cycles is determined by the time required for ice sheets to reach their critical size. The postulates used to construct this conceptual model were justified using analysis of relevant physical and biogeochemical processes and feedbacks. In particular, the role of climate–ice sheet–carbon cycle feedback in shaping and globalization of glacial cycles is discussed. The reasons for the instability of the large northern ice sheets and the mechanisms of the Earth system escape from the “glacial trap” via a set of strongly nonlinear processes are presented. It is also shown that the transition from the 41 to the 100 kyr world about 1 million years ago can be explained by a gradual increase in the critical size of ice sheets, which in turn is related to the gradual removal of terrestrial sediments from the northern continents. The implications of this nonlinear paradigm for understanding Quaternary climate dynamics and the remaining knowledge gaps are finally discussed.

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Tabor, C. R., C. J. Poulsen, and D. Pollard. "Mending Milankovitch theory: obliquity amplification by surface feedbacks." Climate of the Past Discussions 9, no. 4 (2013): 3769–87. http://dx.doi.org/10.5194/cpd-9-3769-2013.

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Abstract. Milankovitch theory states that orbitally induced changes in high-latitude summer insolation dictate the waxing and waning of ice-sheets. Accordingly, precession should dominate the ice-volume response because it most strongly modulates summer insolation intensity. However, Early Pleistocene (2.6–0.8 Ma) ice-volume proxy records vary almost exclusively at the frequency of the obliquity cycle. To explore this paradox, we use an Earth system model coupled with a dynamic ice-sheet to separate the climate responses to idealized transient orbits of obliquity and precession that maximize insolation changes. Our results show that positive surface albedo feedbacks between high-latitude annual-mean insolation, ocean heat flux and sea-ice coverage, and boreal forest/tundra exchange enhance the ice-volume response to obliquity forcing relative to precession forcing. These surface feedbacks, in combination with modulation of the precession cycle power by eccentricity, may explain the dominantly 41 kyr cycles in global ice volume of the Early Pleistocene.

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Lewis, David F. V., and Jean-Lou C. M. Dorne. "The Astronomical Pulse of Global Extinction Events." Scientific World JOURNAL 6 (2006): 718–26. http://dx.doi.org/10.1100/tsw.2006.156.

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The linkage between astronomical cycles and the periodicity of mass extinctions is reviewed and discussed. In particular, the apparent 26 million year cycle of global extinctions may be related to the motion of the solar system around the galaxy, especially perpendicular to the galactic plane. The potential relevance of Milankovitch cycles is also explored in the light of current evidence for the possible causes of extinction events over a geological timescale.

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KAWAHATA, Hodaka. "Global Carbon Cycle Recorded in the Deep-sea Sediments and Milankovitch Cycle." Journal of Geography (Chigaku Zasshi) 104, no. 1 (1995): 1–15. http://dx.doi.org/10.5026/jgeography.104.1.

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Antico, Andrés, Olivier Marchal, Lawrence A. Mysak, and Françoise Vimeux. "Milankovitch Forcing and Meridional Moisture Flux in the Atmosphere: Insight from a Zonally Averaged Ocean–Atmosphere Model." Journal of Climate 23, no. 18 (2010): 4841–55. http://dx.doi.org/10.1175/2010jcli3273.1.

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Abstract A 1-Myr-long time-dependent solution of a zonally averaged ocean–atmosphere model subject to Milankovitch forcing is examined to gain insight into long-term changes in the planetary-scale meridional moisture flux in the atmosphere. The model components are a one-dimensional (latitudinal) atmospheric energy balance model with an active hydrological cycle and an ocean circulation model representing four basins (Atlantic, Indian, Pacific, and Southern Oceans). This study finds that the inclusion of an active hydrological cycle does not significantly modify the responses of annual-mean air and ocean temperatures to Milankovitch forcing found in previous integrations with a fixed hydrological cycle. Likewise, the meridional overturning circulation of the North Atlantic Ocean is not significantly affected by hydrological changes. Rather, it mainly responds to precessionally driven variations of ocean temperature in subsurface layers (between 70- and 500-m depth) of this basin. On the other hand, annual and zonal means of evaporation rate and meridional flux of moisture in the atmosphere respond notably to obliquity-driven changes in the meridional gradient of annual-mean insolation. Thus, when obliquity is decreased (increased), the meridional moisture flux in the atmosphere is intensified (weakened). This hydrological response is consistent with deuterium excess records from polar ice cores, which are characterized by dominant obliquity cycles.

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Martinez, Mathieu, Sergey Kotov, David De Vleeschouwer, Damien Pas, and Heiko Pälike. "Testing the impact of stratigraphic uncertainty on spectral analyses of sedimentary series." Climate of the Past 12, no. 9 (2016): 1765–83. http://dx.doi.org/10.5194/cp-12-1765-2016.

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Abstract. Spectral analysis is a key tool for identifying periodic patterns in sedimentary sequences, including astronomically related orbital signals. While most spectral analysis methods require equally spaced samples, this condition is rarely achieved either in the field or when sampling sediment core. Here, we propose a method to assess the impact of the uncertainty or error made in the measurement of the sample stratigraphic position on the resulting power spectra. We apply a Monte Carlo procedure to randomise the sample steps of depth series using a gamma distribution. Such a distribution preserves the stratigraphic order of samples and allows controlling the average and the variance of the distribution of sample distances after randomisation. We apply the Monte Carlo procedure on two geological datasets and find that gamma distribution of sample distances completely smooths the spectrum at high frequencies and decreases the power and significance levels of the spectral peaks in an important proportion of the spectrum. At 5 % of stratigraphic uncertainty, a small portion of the spectrum is completely smoothed. Taking at least three samples per thinnest cycle of interest should allow this cycle to be still observed in the spectrum, while taking at least four samples per thinnest cycle of interest should allow its significance levels to be preserved in the spectrum. At 10 and 15 % uncertainty, these thresholds increase, and taking at least four samples per thinnest cycle of interest should allow the targeted cycles to be still observed in the spectrum. In addition, taking at least 10 samples per thinnest cycle of interest should allow their significance levels to be preserved. For robust applications of the power spectrum in further studies, we suggest providing a strong control of the measurement of the sample position. A density of 10 samples per putative precession cycle is a safe sampling density for preserving spectral power and significance level in the Milankovitch band. For lower sampling density, the use of gamma-law simulations should help in assessing the impact of stratigraphic uncertainty in the power spectrum in the Milankovitch band. Gamma-law simulations can also model the distortions of the Milankovitch record in sedimentary series due to variations in the sedimentation rate.

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Fong Chao, Benjamin. "“Concrete” Testimony to Milankovitch Cycle in Earth's changing obliquity." Eos, Transactions American Geophysical Union 77, no. 44 (1996): 433. http://dx.doi.org/10.1029/96eo00291.

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Dissertations / Theses on the topic "Milankovitch Cycle"

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Tierney, Kate. "Milankovitch cycles in the distant past /." Columbus, Ohio : Ohio State University, 2002. http://hdl.handle.net/1811/6109.

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Ditchfield, Peter William. "Milankovitch cycles in Cenomanian chalks of the Anglo-Paris Basin." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293784.

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Hoang, Hoai-Nam. "Long term stability and diffusion in the solar system." Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLO002.

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Le système solaire étant chaotique, l'évolution de l'orbite de la Terre au-delà de 60 millions d'années ne peut être prédite de manière fiable. En revanche, les variations orbitales de la Terre contrôlent l'insolation qui entraîne des changements climatiques à long terme, et ont été imprimées dans les enregistrements géologiques. La récupération de ce forçage astronomique dans les données géologiques a révolutionné la détermination des échelles de temps géologiques. La prise en compte de l'incertitude chaotique du forçage astronomique est une nécessité. Pour aborder ce problème, nous obtenons, évaluons et illustrons l'application de fonctions de densité de probabilité des fréquences séculaires en utilisant kernel density estimation, dont l'incertitude est déterminée par la méthode du moving block bootstrap. En plus d'être chaotiques, les planètes internes du système solaire peuvent également être instables. Malgré le manque de contraintes apparentes qui limitent la dynamique chaotique, la probabilité d'instabilité est remarquablement faible en 5 milliards d'années, surtout si l'on considère qu'elle est 1000 fois plus longue que le temps de Lyapunov du système. Nous tentons de résoudre ce paradoxe dans cette thèse en étudiant la déstabilisation dans sa complexité totale d'un système de haute dimension. Dans un premier temps, nous fournissons une analyse statistique exhaustive de l'instabilité jusqu'à 100 Gyr à partir d'une hiérarchie de modèles séculaires à différents degrés d'excentricités et d'inclinaisons. Nous constatons que l'hamiltonien tronqué au degré 4, malgré son exhaustivité, est trop stable et ne suffit pas à reproduire les statistiques d'instabilité. Ceci est dû à la contribution significative inattendue des termes au degré 6 à la frontière de l'instabilité.Dans un deuxième temps, nous montrons que la dynamique des planètes internes sur son échelle de temps chaotique est lente-rapide avec une large séparation des échelles de temps. La première preuve se trouve dans son spectre de Lyapunov, où une hiérarchie d'exposants caractéristiques s'étend sur deux ordres de grandeur. Les plus petits exposants de Lyapunov peuvent être reliés aux variables lentes, qui varient sur une échelle de temps beaucoup plus longue que le temps de Lyapunov. Concrètement, à partir d'une analyse systématique des résonances séculaires principales, nous démontrons trois quasi-symétries, qui définissent trois quasi-intégrales de mouvement. Par une nouvelle utilisation d'une méthode statistique traditionnelle - l'analyse en composantes principales, nous confirmons que ces quasi-intégrales sont parmi les degrés de liberté les plus lents de la dynamique chaotique. Les quasi-intégrales contraignent la diffusion chaotique à long terme des orbites, ralentissant ainsi le système dans sa trajectoire vers la collision planétaire<br>Because the Solar System is chaotic, the orbital evolution of the Earth's orbit beyond 60 Myr cannot be reliably predicted. On the other hand, Earth's orbital variations control insolation which leads to long-term climate change, and were thus imprinted in the geological records. The recovery of this astronomical forcing in geological data has revolutionized the determination of the geological time scales. Taking into account the chaotic uncertainty of the astronomical forcing is necessary for a complete astronomical calibration of geological records. To address this problem, we obtain, benchmark and illustrate the application of probability density functions of the secular frequencies using kernel density estimation, whose uncertainty determined by the moving block bootstrap method.Apart from being chaotic, the inner planets of the Solar System can also be unstable. Despite the lack of apparent constraints that bound the chaotic dynamics, the probability of instability is remarkably low in 5 billion years, especially considering it is 1000 times longer than the Lyapunov time of the system. We attempt to resolve the paradox in this thesis by studying the destabilization in its total complexity of a high dimensional system. As a first step, we provide an exhaustive statistical analysis of instability up to 100 Gyr from a hierarchy of secular models at different degrees in eccentricities and inclinations. We find that the Hamiltonian truncated at degree 4, despite its comprehensiveness, is overly stable and not sufficient to reproduce the instability statistics. This is due to the unexpectedly significant contribution of the terms at degree 6 to the frontier of instability. As a second step, we show that the dynamics of the inner planets over its chaotic timescale is slow-fast with a wide separation of timescales. The first evidence is found in its Lyapunov spectrum, where a hierarchy of characteristic exponents spans two orders of magnitude. The smallest Lyapunov exponents can be related to the slow variables, which vary on a timescale much longer than the Lyapunov time. Concretely, from a systematic analysis of the leading secular resonances, we demonstrate three quasi-symmetries, which define three quasi-integral of motion. By a novel utilization of a traditional statistical method - principal component analysis, we confirm that these quasi-integrals are among the slowest degrees of freedom of the chaotic dynamics. The quasi-integrals constrain the long-term chaotic diffusion of the orbits, thereby slowing down the system in their pathway towards planetary collision

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Rutherford, Scott David. "Phytoplankton productivity and Milankovitch Cycles in the Cenomanian-Turonian Bridge Creek member of the Greenhorn Formation in southeastern Colorado." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01102009-063011/.

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Sentenac, Françoise. "Etude de séquences loféritiques en domaine carbonaté : leur signification géodynamique." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22055.

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Le thème abordé, l' étude des séquences loféritiques, a été traité à partir d'exemples, situés dans deux zones géographiques distinctes : la Provence et l' Italie centrale, à des époques différentes du Mésozoïque, l' étude stratigraphique, basée sur le contenu micropaléontologique (foraminifères et algues calcaires) actualisé et complété, a permis de préciser ou réviser l'attribution stratigraphique de certaines séries. La reconstitution des paléoenvironnements, axée sur les critères hydrologiques, hydrodynamiques et bathymétriques, a mis en évidence quatre grands ensembles biosédimentaires : le domaine de plate-forme interne, caractérisé par des sédiments sableux, ou la biophase est la plus variée et la plus abondante; le domaine marginolittoral exposé, régi par un gradient hydrodynamique élevé ; le domaine marginolittoral abrité, dominé par une sédimentation micritique, ou les variations hydrologiques sont les plus marquées et les indices d'exondation temporaire les plus fréquents; le domaine insulaire caractérisé par des altérations et cimentations du sédiment. L' inventaire des séquences élémentaires et l'analyse des transitions ont montré la diversité du motif séquentiel. Les séquences ont été classées, selon un critère bathymétrique, en trois groupes: les séquences bathydécroissantes, les séquences bathycroissantes, et les séquences bipolaires. L' analyse spectrale a été appliquée à l' étude des rythmes, sur les paramètres facies, hydrodynamisme, et bathymétrie. En complément à cette analyse, une technique nouvelle a été mise au point, afin de déterminer de façon graphique, les variations engendrées par un ou plusieurs des rythmes mis en évidence sur les spectres de puissance. Il ressort que les rythmes les plus significatifs, se situent dans le domaine des basses fréquences et représentent en moyenne 60% des variations de facies et d'hydrodynamisme, mais moins de 50% des variations bathymétriques. Ils rendent compte des fluctuations entre les ensembles plate-forme interne du marginolittoral exposé, et les domaines marginolittoral abrité-insulaire; ainsi que de l'opposition entre des conditions hydrodynamiques fortes et conditions moyennes à nulles Pour la bathymétrie, seules des oscillations de faible amplitude (infralittoral-médiolittoral inférieur) correspondent à ces rythmes. Ces rythmes ont souvent des périodes voisines des cycles de Milankovitch : le premier rythme de l'excentricité de l'orbite terrestre (100000 ans) y est le plus fréquent. L' élaboration des séquences loféritiques se corrèle a des modifications physiographiques de la plate-forme et à une mobilité du talus. La tectonique saccadée du tréfonds combinée àdes phénomènes périodiques astronomiques, détermineraient la sédimentation loféritique.

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Giraud, Fabienne. "Recherche des périodicités astronomiques et des fluctuations du niveau marin à partir de l'étude du signal carbonaté des séries pélagiques alternantes : application au crétacé inférieur du Sud-Est de la France (Bassin vocontien)... /." Lyon : Centre des sciences de la Terre, 1995. http://catalogue.bnf.fr/ark:/12148/cb35786572m.

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Boulila, Slah. "Cyclostratigraphie des séries sédimentaires du Jurassique supérieur (Sud-Est de la France, Nord de la Tunisie) : contrôle astro-climatique, implications géochronologiques et séquentielles." Paris 6, 2008. http://www.theses.fr/2008PA066019.

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Une étude cyclostratigraphique à haute résolution a été entreprise, en utilisant les variations de la susceptibilité magnétique (SM), sur trois coupes marneuses oxfordiennes et deux coupes d’alternances marno-calcaires kimméridgiennes du Bassin du Sud-Est de la France. Les séries marneuses oxfordiennes enregistrent avec les plus fortes amplitudes de SM, les cycles d’excentricité à 100 et 405 ka. Les séries d’alternances kimméridgiennes détectent plutôt préférentiellement les cycles de précession. Les durées estimées des zones d’ammonites sont très proches de celles de l’échelle des temps géologiques GTS2004 pour le Kimméridgien inférieur, mais notablement différentes pour l’Oxfordien inférieur et moyen. Comparés aux séquences eustatiques de 3ème ordre de la charte globale de référence, les cycles d’excentricité à 405 ka semblent contrôler les variations du niveau marin relatif au moins durant le Kimméridgien inférieur et l’Oxfordien inférieur et moyen dans le Bassin du Sud-Est.

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Binyatov, Elnur. "Sedimentological, Cyclostratigraphic Analysis And Reservoir Characterization Of Balakhany X Formation Within The Productive Series Azeri Field On C01 Well (offshore Azerbaijan)." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609628/index.pdf.

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The Azeri, Chirag, Gunashli (ACG) field is located offshore Azerbaijan. The reservoirs are multilayered sandstones forming traps within a major anticlinal structure. Proven crude oil reserves are estimated to contain 5.4 billion barrels of oil. In the past this area has been studied in regional detail but not at the reservoir scale with respect to the fluvio-deltaic sediments filling the northern shore of the ancient South Caspian Sea. The aim of this study is carried out the sedimentological, cyclostratigraphical analysis and reservoir characterization of Balakhany X Formation within the Productive Series which is considered to be one of the significant producing horizons. To be able to achieve this objective, a 30m thick section, which is mainly composed of siliciclastics, has been studied in detail on Balakhany X cores from C01 well Azeri field. In this study, detailed lithofacies analyses were performed and sandstone, mudstone, siltstone facies were recognized in the studied interval of the Balakhany X Formation. Litharenites and sublitharenites sandstones are the most abundant in the succession. Sedimentological analysis such as grain-size sphericity, provenance, XRD, SEM and grain surface texture were performed and their relationship with depositional environment were discussed. The grain size distribution of the samples along the succession shows distribution of fine to very fine sands. Sorting of sandstones ranges between moderately well to very well sorted. The provenance analysis of sandstones based on modal analysis of thin sections related to recycled orogen. According to interpretation of grain size parameters and grain surface textures analysis the main transporting agent of sands observed as wind, wave and river agents. High resolution cyclostratigraphy studies based on cm-m scaled cyclic occurrences of lithofacies along the measured section were performed. Milankovitch, sub-Milankovitch and millennial cycles were determined along the studied section. The petrophysical analysis revealed good to very good (18 to 24%) porosity and good permeability (10 to 538mD) in Balakhany X Formation. The porosity and permeability are affected by both textural and compositional controls. Grain size distribution along the reservoir section is fine to very fine sands. Influence of compaction was observed by the fractures and dissolutions on the sand grains. The calcite cement, grain-size variation, sorting and compaction are the main factors controlling porosity and permeability.

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Liu, Wei. "Influence de la mousson et des changements du niveau marin sur la sédimentation hémipélagique en Mer de Timor au cours des derniers 240 ka." Paris 6, 2011. http://www.theses.fr/2011PA066522.

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Les variations de la composition des sédiments pélagiques permettent d’appréhender les changements de l’environnement au cours du temps et d’en discuter les facteurs de contrôle. C’est ce qui a été tenté sur une carotte prélevée lors de la mission MD122 dans la Mer de Timor, à mi-chemin entre l’Indonésie et l’Australie. La carotte MD01-2376, prélevée à une profondeur de 2906 m, a échantillonné le sédiment sur 27,90 m. Celui-ci est constitué d’une boue biogène calcaréo-siliceuse riche en argile et en matière organique. Le sommet de cette carotte a été daté par 14C et l’ensemble de la carotte a été stratigraphiquement calé grâce aux données isotopiques (δ18O) obtenues sur le foraminifère Globigerinoides ruber. La base de la carotte est datée de 250 000 ans. Ainsi il est possible de suivre l’évolution de la composition du sédiment, et notamment de sa fraction organique, sur cet intervalle de temps et de comparer nos données à celles obtenues antérieurement sur deux carottes voisines situées respectivement à 1783 et 3875 m de profondeur. Les teneurs en carbonate, en carbone organique, le type de matière organique (déterminée par pyrolyse Rock-Eval, analyse C/N et isotopie des kérogènes mais aussi par la détermination des palynofaciès) et l’analyse élémentaire du sédiment par XRF core scanner ont été les principaux marqueurs utilisés. L’analyse en composante principale des données XRF permet de discriminer trois groupes d’éléments dont les comportements sont reliés à (1) la productivité (Ca, Sr, Si, Br, …), (2) aux flux détritiques (Al, K, Ti, Rb, Zr) et (3) aux conditions redox (Mn). L’analyse spectrale des marqueurs organiques et inorganiques et leur comparaison mettent en évidence un double contrôle de la sédimentation : le premier par les variations du niveau marin lors des cycles glaciaires-interglaciaires correspondant aux cycles d’excentricité et le second à plus haute fréquence correspond aux changements de l'intensité de la mousson sous l’influence de la précession des équinoxes. Lors des périodes glaciaires, la mousson du nord-ouest faiblit ce qui diminue les précipitations et permet un brassage des eaux et une plus forte productivité de surface. Celle-ci conduit à des flux exportés plus importants, notamment en carbonate et matière organique. Pour autant, les sédiments glaciaires sont moins carbonatés que leurs homologues interglaciaires car la dégradation de la matière organique et les conditions plus réductrices des eaux de fond favorisaient la dissolution de la calcite. La comparaison des trois carottes révèle des similitudes et des différences. L’amplitude des variations des teneurs en CaCO3 et du Corg sont globalement identiques entre les trois carottes, même si les teneurs en CaCO3 diminuent logiquement avec la profondeur des sites. En revanche, les teneurs en Corg sont quasiment identiques quelle que soit la profondeur du site, ce qui s’explique par une dissolution plus rapide des carbonates que ne l’est la dégradation de la matière organique marine. On note quelques petits décalages temporels ou des comportements différents entre les trois carottes que l’on peut interpréter comme l'influence des circulations d'eau profonde et leur effet sur la préservation des carbonates et/ou de la matière organique. Le palynofacies légèrement différent entre la carotte MD98-2166 et MD01-2376 suggère une plus grande proximité des sources de matière organique terrestre au niveau de la carotte MD98-2166 lors des périodes glaciaires. Enfin, les données isotopiques sur les kérogènes suggèrent une influence des plantes en C4 (d’origine australienne) plus marquée pendant les périodes glaciaires.

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Martinez, Mathieu. "Calibration astronomique du Valanginien et de l'Hauterivien (crétacé inférieur) : Implications paléoclimatiques et paléocéanographiques." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00906955.

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Une calibration orbitale du Valanginien et d'une partie de l'Hauterivien (Crétacé inférieur) est présentée au cours de ce travail. Celles-ci sont basées sur l'identification des cycles de l'excentricité à partir d'analyses spectrales menées sur des proxies climatiques mesurés à haute résolution sur des alternances marne/calcaire hémipélagiques.Cinq coupes de référence sont analysées dans le Bassin Vocontien (Sud-Est de la France), couvrant l'ensemble de l'étage du Valanginien. Une durée de 5,08 Ma est proposée pour cet étage à partir de l'identification du cycle de l'excentricité de 405 ka. Le cadre temporel proposé, combiné aux âges radioisotopiques disponibles, montre que la perturbation en 13C du Valanginien moyen (événement Weissert) est antérieure à la mise en place des trapps du Paraná-Etendeka. La forte expression de l'obliquité dans la partie supérieure du Valanginien pourrait refléter la mise en place de calottes polaires de faible extension.La transition Hauterivien-Barrémien de Río Argos (Sud-Est de l'Espagne) est traitée par une analyse multi-proxies (cortèges argileux et susceptibilité magnétique ou SM). Par comparaison avec les bancs calcaires, les interbancs marneux sont enrichis en kaolinite et en illite, appauvries en smectite et possèdent de fortes valeurs de SM. Cela reflète des conditions tropicales humides lors du dépôt des marnes tandis que les calcaires se déposent en climat semi-aride. Les durées des zones d'ammonite à P. ohmi et à T. hugii sont respectivement estimées à 0,78 Ma et 0,54 Ma. L'événement anoxique Faraoni a une durée comprise entre 100 et 150 ka. Par corrélation avec d'autres coupes, Río Argos apparaît être le meilleur candidat GSSP

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Books on the topic "Milankovitch Cycle"

1

Schwarzacher, Walther. Cyclostratigraphy and the Milankovitch theory. Elsevier, 1993.

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Hering, Gerd. Milankovitch-Zyklen in mitteldevonischen Schelf-Carbonaten des Rheinischen Schiefergebirges. Im Selbstverlag der Geologischen Institute der Georg-August-Universität Göttingen, 1995.

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Read, J. F. Milankovitch sea level changes, cycles, and reservoirs on carbonate platforms in greenhouse and ice-house worlds: A short course. SEPM, 1995.

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Read, J. F. Milankovitch sea level changes, cycles, and reservoirs on carbonate platforms in greenhouse and ice-house worlds: A short course organized. Society for Sedimentary Geology, 1995.

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Devonian events and biostratigraphy of south China: Conodont zonation and correlation, bio-event and chemo-event, Milankovitch cycle and nickel-episode. Peking University Press, 1994.

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A response to "Milankovitch theory viewed from Devils Hole" by J. Imbrie, A.C. Mix and D.G. Martinson. U.S. Dept. of the Interior, Geological Survey, 1993.

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Orbital Forcing Timescales & Cyclostratigraphy. (Geological Society Special Publication Ser. No 85.). Geological Society Publishing House, 1995.

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Ellam, Rob. 7. Reconstructing the past and weathering the future. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0007.

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Tiny microfossils called Foraminifera form calcium carbonate shells that record the δ18O composition of the seawater in which they grew. These microfossils are found in sea bed sediment cores, and a lot of information from these oxygen isotope records can be extracted. ‘Reconstructing the past and weathering the future’ looks at the methodology used in palaeoclimate studies and explains gain and phase modelling and Milankovitch orbital cycles. Similar isotope temperature records have been constructed from polar ice cores. Atmospheric CO2 composition can be reconstructed from the amount of CO2 dissolved in the ice. A new sub-discipline of clumped isotope geochemistry—‘isotomics’—will have applications far beyond carbonate palaeothermometry.

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Book chapters on the topic "Milankovitch Cycle"

1

Schwarzacher, W. "Milankovitch Cycles and Sequences: Two Different Stratigraphic Tools." In Computerized Modeling of Sedimentary Systems. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03902-1_12.

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Spiegel, David S., Sean N. Raymond, Courtney D. Dressing, Caleb A. Scharf, and Jonathan L. Mitchell. "Exaggerated Milankovitch-Like Eccentricity Cycles and Extreme Exoplanet Climate Variation." In Climate Change. Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-0973-1_10.

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"Milankovitch Cycle(s)." In Environmental Biology. Science Publishers, 2009. http://dx.doi.org/10.1201/b10187-6.

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Summerhayes, Colin. "Icehouse Climates." In The Icy Planet. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197627983.003.0002.

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Abstract Over the past 1,000 million years, Earth’s climate oscillated between warm greenhouse climates (abundant CO2), when sea level was high, and cold icehouse climates (low CO2), when sea level was low and large ice sheets were common. At times between 1,000 and 500 million years ago Earth was a “snowball” covered in ice from poles to tropics. Icehouse climates with polar ice developed around 445 million years ago, 300 million years ago, and over the past 34 million years (when the Antarctic ice sheet formed). Northern hemisphere ice sheets developed over the past 2.6 million years, when climates oscillated from warm to cold in Milankovitch Cycles. Human civilization developed in a warm Milankovitch Cycle peaking about 12,000 years ago. Plate tectonics drove rises in CO2 when volcanism was abundant. Chemical weathering of mountains drove falls in CO2. As trees evolved, they also sucked CO2 out of the air.

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McMichael, Anthony. "Spread of Farming, New Diseases, and Rising Civilizations: Mid- Holocene Optimum." In Climate Change and the Health of Nations. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190262952.003.0010.

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As The Earth Warmed after the last glacial maximum, temperatures fluctuated. About 9700 B.C.E., temperatures rose again suddenly and began to stabilize, marking the beginning of a new geological epoch, the Holocene. The landscape continued to change, but not so fast that a single generation of humans would have noticed. Ice- sheets and tundra were receding in Eurasia, and over time human groups, both hunter- gatherers and then early farmer- pastoralist communities, adjusted their ways of living to warmer conditions and different rainfall patterns. Small- scale farming and herding emerged on all nonpolar continents during the period 8500 to 6000 B.C.E., predominantly in the northern hemisphere, while human numbers were creeping up. These great changes in environmental conditions and subsequent cultural practices had a profound influence on the foundations of human health and survival: food sufficiency and quality, water supplies, contacts with infectious agents, modes of settlement, and social relations. A new era in human ecology was looming. Farming increased food production, but the switch to dependency on a few staples decreased diversity of diets and created an annual agricultural regime more susceptible to climate shifts. Close contact with animals, standing water in irrigated environments, and denser settlements provided opportunities for microbes, pathogens, viruses, and parasites to cross species barriers and infect and spread among human populations. During the Early Holocene, from about 9700 B.C.E. to 6000 B.C.E., the earth was subjected to the competing stresses of high solar influence and still massive melting ice- sheets. From around 6000 B.C.E., the majority of ice- sheet melting had abated, allowing the stabilization of the Earth’s climate into what can be called the Mid- Holocene Climatic Optimum (approx. 6000 to 3000 B.C.E.). This was a change in climate that spanned 3,000 to 4,000 years. Warming was most evident in the northern hemisphere, influenced by the peaking of solar radiation at higher northern latitudes as the 23,000- year Milankovitch “wobble” cycle maximized northern sun exposure for several millennia. The Milankovitch cycle also drew the rain- bearing Inter- Tropical Convergence Zone (ITCZ) further north.

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"MILANKOVITCH CYCLES." In The Little Book of Weather. Princeton University Press, 2024. http://dx.doi.org/10.2307/jj.14284456.42.

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"MILANKOVICH CYCLES." In The Complete Guide to Climate Change. Routledge, 2008. http://dx.doi.org/10.4324/9780203888469-48.

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Kerans, Charles. "USE OF ONE- AND TWO-DIMENSIONAL CYCLE ANALYSIS IN ESTABLISHING HIGH-FREQUENCY SEQUENCE FRAMEWORKS." In Milankovitch Sea-level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-House Worlds. SEPM (Society for Sedimentary Geology), 1995. http://dx.doi.org/10.2110/scn.95.35.0001a.

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READ, J. F. "OVERVIEW OF CARBONATE PLATFORM SEQUENCES, CYCLE STRATIGRAPHY AND RESERVOIRS IN GREENHOUSE AND ICE-HOUSE WORLDS." In Milankovitch Sea-level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-House Worlds. SEPM (Society for Sedimentary Geology), 1995. http://dx.doi.org/10.2110/scn.95.35.0001.

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Pälike, H. "EARTH | Orbital Variation (Including Milankovitch Cycles)." In Encyclopedia of Geology. Elsevier, 2005. http://dx.doi.org/10.1016/b0-12-369396-9/00123-4.

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Conference papers on the topic "Milankovitch Cycle"

1

Ying*, Guo. "Application of Milankovitch Cycle Analysis to Achieve High Definition Erosional Map From Yubei Area of Tarim Basin, China." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2209872.

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Wehner, Matthew, and Jacob Grosskopf. "ANTONIO CREEK SECTION MILANKOVITCH CYCLE DETECTION AND OAE 2 CORRELATION TO OTHER LOCATIONS IN THE WESTERN INTERIOR SEAWAY DESPITE HIATUSES." In 51st Annual GSA South-Central Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017sc-289337.

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Jovanovic, Gordana. "Milankovitch cycles, eighty years later." In 11th International Conference of the Balkan Physical Union. Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.427.0044.

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Gustovich, Kristina, Edward Geary, and Daniel Hanley. "GENDER AND SPATIAL REASONING: THE MILANKOVITCH CYCLES." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283914.

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Drake, Lee. "PREDICTING INTERGLACIAL TRANSITIONS WITH MACHINE LEARNING AND THE MILANKOVITCH CYCLES." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-381096.

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Поморцев, О., O. Pomorcev, А. Поморцева, and A. Pomorceva. "Absolute Chronology of Pleistocene Transgressive Cycles and Their Position on M. Milankovitch Scale." In XXVII International Shore Conference "Arctic Coast: The Path to Sustainability". Academus Publishing, 2019. http://dx.doi.org/10.31519/conferencearticle_5cebbb8cd484e8.51604428.

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Larsen, Kristine. "MILANKOVITCH CYCLES AND THE PROPHECY OF ITHLINNE: CLIMATE CHANGE DENIAL IN THE FICTIONAL WORLD OF ANDRZEJ SAPKOWSKI’S WITCHER SERIES." In Northeastern Section-56th Annual Meeting-2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021ne-361502.

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Grippo, Alessandro, Linda A. Hinnov, and Linda A. Hinnov. "GRAND MILANKOVITCH CYCLES RECORDED IN THE CRETACEOUS (ALBIAN) FUCOID MARLS, PIOBBICO CORE, ITALY, AND IMPLICATIONS FOR THE CHAOTIC EVOLUTION OF THE SOLAR SYSTEM." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-336139.

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Parker, Douglas. "CYCLIC SEDIMENTATION PATTERNS CAN RESULT FROM CYCLIC INCREASES IN VOLCANICLASTIC INPUT DRIVEN BY CHANGES IN THE ORIENTATION OF THE GRAVITATIONAL PULL ON THE EARTH (MILANKOVITCH CYCLES)." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-391913.

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Gou, Patrick, Raja Azlan Raja Ismail, Florence Yuen, et al. "Deciphering the Record of the Sun-Earth Dance in Well Logs: The Extra-Terrestrial Imprint and its Application to High-Resolution Stratigraphy and Well Correlation in South Furious Field, Offshore North Sabah." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31567-ms.

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Abstract South Furious is an oilfield in the Inboard Belt offshore North Sabah with oil production since 1979. The field is heavily faulted and compartmentalized, making it structurally complex and challenging for development. It is believed that the field has a low recovery factor, despite having a relatively large oil in-place volume reported. Its highly-heterogenous Stage IVA reservoir with thin sand-shale intercalations, and poor seismic imaging quality make stratigraphic interpretation and well correlations highly uncertain. Recognizing the limitations of conventional methods for well correlation in South Furious, SEA Hibiscus decided to take a quantitative approach on the existing well logs itself, particularly the gamma ray (GR) curve. This data-driven approach is a shift from the unsuccessful model-based method. Cyclostratigraphic analysis using CycloLog works on the principle that extra-terrestrial forces described by the Milankovitch Cycles have a huge influence on sedimentation processes, and its record are preserved in the well logs that we acquire while drilling, although not always obvious without the proper quantitative approach. This high-resolution stratigraphic method allows the detection of cyclic signals in facies-sensitive wireline logs (e.g., gamma ray), including subtle ones, and at resolutions that are equivalent to 4th to 6th Order stratigraphic cycles. Utilizing the Integrated Prediction Error Filter Analysis (INPEFA), geological breaks or events are quantitatively and objectively identified. Cyclostratigraphic and climate stratigraphy concepts as described by Perlmutter and Matthews (1990) and Nio (2005) form the basis of this analysis, which is an evolution of traditional sequence stratigraphic concepts. Results from the 10 pilot wells in South Furious show dramatic improvements in the stratigraphic correlation resolution, particularly in the deeper/older sections, allowing correlations to be made across different fault block segments, previously nearly impossible. With the ongoing inclusion of more wells to the cyclostratigraphic study and future plans to integrate independent chemostratigraphic data, a more robust stratigraphic framework for the field would be established. Results from the current study prove that the cyclostratigraphic method allows objective, quantitative and data-driven stratigraphic well correlations to be made from a systematic and quantitative review of existing well logs, without additional rock sampling or measurement, and in a cost-effective manner. Geoscientists should always be receptive to new ways of working, including utilizing data and techniques that have origins outside mainstream geoscience.

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