Relevant bibliographies by topics / Carbonate pump

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  2. Dissertations / Theses
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Academic literature on the topic 'Carbonate pump'

Author: Grafiati
Published: 25 May 2024

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Journal articles on the topic "Carbonate pump"

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Silkin, Vladimir A., Oleg I. Podymov, and Anna V. Lifanchuk. "Biological carbon pump in the Black Sea." Hydrosphere Еcology (Экология гидросферы), no. 2(8) (December 2022): 69–92. http://dx.doi.org/10.33624/2587-9367-2022-2(8)-69-92.

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In the northeastern part of the Black Sea, the biological carbon pump is represented by both organic and carbonate pumps. The organic carbon pump consists of small-cell diatoms (mainly Pseudo-nitzschia pseudodelicatissima) and large-cell diatoms (Pseudosolenia calcar-avis and Proboscia alata). The carbonate pump is represented by only one species of cococcolithophore, Emiliania huxleyi. These species form intense blooms that require characteristic hydrological and hydrochemical conditions. The seasonal dynamics of the biological carbon pump is as follows: organic pump (spring) → carbonate pump
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Pautova, Larisa A., and Vladimir A. Silkin. "Biological carbon pump in the ocean and phytoplankton structure." Hydrosphere Еcology (Экология гидросферы), no. 1(3) (2019): 1–12. http://dx.doi.org/10.33624/2587-9367-2019-1(3)-1-12.

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The process of carbon transfer from the atmosphere to the ocean floor is determined by three different pumps in nature: a solubility pump, an organic pump and a carbonate pump. The latter two are of biological nature. Phytoplankton is a key mediator of organic and carbonate pumps. Depending on its structure, either an organic pump or a carbonate pump will dominate. The structure of the phytoplankton community is formed depending on the hydrophysical and hydrochemical conditions in the ocean. An important regulator of a biological carbon pump is the intensity of the processes in the carbon cycl
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J.P, GUPTA, SUMBRIA N.M, and KHANNA Y.P. "QUALITY OF DIFFERENT SOURCES OF IRRIGATION WATER OF JAMMU REGION." Madras Agricultural Journal 85, February (1998): 110–12. http://dx.doi.org/10.29321/maj.10.a00694.

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Water samples from different sources viz., rivers, streams, nallahs, tube wells and hand pumps in Jammu region were collected and analysed for quality parameters to ascertain their suitability for imigation purposes. Except some of the tubewell and hand pump water samples which showed higher values of residual sodium carbonate, most of the water sources were observed to he suitable for irrigation purposes.
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Cerclet, Léo, Benoît Courcelles, and Philippe Pasquier. "Impact of Standing Column Well Operation on Carbonate Scaling." Water 12, no. 8 (2020): 2222. http://dx.doi.org/10.3390/w12082222.

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Standing column well constitutes a recent promising solution to provide heating or cooling and to reduce greenhouse gases emissions in urban areas. Nevertheless, scaling issues can emerge in presence of carbonates and impact their efficiency. Even though a thermo-hydro-geochemical model demonstrated the impact of the water temperature on carbonate concentration, this conclusion has not been yet demonstrated by field investigations. To do so, an experimental ground source heat pump system connected to a standing column well was operated under various conditions to collect 50 groundwater samples
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Guo, Liyu, and Wenju Shan. "Water Source Heat Pump’s Stuck Problems and Solutions." Journal of Physics: Conference Series 2174, no. 1 (2022): 012084. http://dx.doi.org/10.1088/1742-6596/2174/1/012084.

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Abstract This paper analyses the water source heat pump’s normal stuck reasons, and test each of them. Identify the main reasons of the stuck pump is pump mechanical seal dynamic ring and static ring binding problems. (Poor water quality, water calcium carbonate, magnesium carbonate grind through the dynamic and static ring, after a long time stop, static ring long force extrusion contact, static ring binding surface molecular diffusion migration adhesion), due to the two rings’ binding, rotating torque beyond the motor starting torque, make the motor can’t start normally. This paper aims to f
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Gao, Qing He, Yi Can Wang, and Yu Mei Jiang. "Study on Scaling Formation Characteristics and Produced Liquid Properties in Oil-Wells of ASP Flooding." Advanced Materials Research 524-527 (May 2012): 1270–78. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1270.

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Strong base ASP flooding technology can improve oil recovery by 20%, but the lifting system exists serious scaling problems which cause pump detection period shorter. The main composition of the scale are organisms (heavy oil is in majority), carbonates and silicates. The content of each component is closely related to pH value. With high pH value, the main composition of the scale is silicate. With low pH value, the main composition of the scale is carbonate. The results of analysis of the relationship between scale composition, scaling position and depositional sequence showed that the conte
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Matsumura, Yukihiko, and Kunio Yoshida. "Heat pump characteristics of sodium carbonate dehydration/hydration system." International Journal of Energy Research 19, no. 3 (1995): 253–61. http://dx.doi.org/10.1002/er.4440190309.

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Planchat, Alban, Laurent Bopp, Lester Kwiatkowski, and Olivier Torres. "The carbonate pump feedback on alkalinity and the carbon cycle in the 21st century and beyond." Earth System Dynamics 15, no. 3 (2024): 565–88. http://dx.doi.org/10.5194/esd-15-565-2024.

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Abstract. Ocean acidification is likely to impact all stages of the ocean carbonate pump, i.e. the production, export, dissolution and burial of biogenic CaCO3. However, the associated feedback on anthropogenic carbon uptake and ocean acidification has received little attention. It has previously been shown that Earth system model (ESM) carbonate pump parameterizations can affect and drive biases in the representation of ocean alkalinity, which is critical to the uptake of atmospheric carbon and provides buffering capacity towards associated acidification. In the sixth phase of the Coupled Mod
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Salmon, K. H., P. Anand, P. F. Sexton, and M. Conte. "Upper ocean mixing controls the seasonality of planktonic foraminifer fluxes and associated strength of the carbonate pump in the oligotrophic North Atlantic." Biogeosciences Discussions 11, no. 8 (2014): 12223–54. http://dx.doi.org/10.5194/bgd-11-12223-2014.

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Abstract. Oligotrophic regions represent up to 75% of Earth's open-ocean environments, and are typically characterized by nutrient-limited upper-ocean mixed layers. They are thus areas of major importance in understanding the plankton community dynamics and biogeochemical fluxes. Here we present fluxes of total planktonic foraminifera and eleven planktonic foraminifer species from a bi-weekly sediment trap time series in the oligotrophic Sargasso Sea, subtropical western North Atlantic Ocean at 1500 m water depth, over two ∼2.5 year intervals, 1998–2000 and 2007–2010. Foraminifera flux was clo
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Guo, Yintong, Peng Deng, Chunhe Yang, Xin Chang, Lei Wang, and Jun Zhou. "Experimental Investigation on Hydraulic Fracture Propagation of Carbonate Rocks under Different Fracturing Fluids." Energies 11, no. 12 (2018): 3502. http://dx.doi.org/10.3390/en11123502.

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Deep carbonate reservoirs are rich in oil and gas resources. However, due to poor pore connectivity and low permeability, it is necessary to adopt hydraulic fracturing technology for their development. The mechanism of hydraulic fracturing for fracture initiation and propagation in carbonate rocks remains unclear, especially with regard to selection of the type of fracturing fluid and the fracturing parameters. In this article, an experimental study focusing on the mechanisms of hydraulic fracturing fracture initiation and propagation is discussed. Several factors were studied, including the t
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Dissertations / Theses on the topic "Carbonate pump"

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Planchat, Alban. "Alkalinity and calcium carbonate in Earth system models, and implications for the ocean carbon cycle." Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLE005.

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L’alcalinité de l’océan (Alk) est essentielle dans l’absorption de carbone atmosphérique et offre une capacité tampon contre l’acidification. Dans le cadre des prévisions de l’absorption de carbone par les océans et des impacts potentiels sur les écosystèmes, la représentation de l’Alk et du principal facteur de sa distribution dans l’océan profond, le cycle du carbonate de calcium (CaCO3), ont souvent été négligés. Cette thèse aborde le manque de considération accordé à l’Alk et au cycle du CaCO3 dans les modèles du système terrestre (ESM) et explore les implications pour le cycle du carbone
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Lemaitre, Nolwenn. "Approche multi-proxy (Thorium-234, Baryum en excès) des flux d'export et de reminéralisation du carbone et des éléments nutritifs associés à la pompe biologique océanique." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0009/document.

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L’objectif principal de cette thèse est de mieux comprendre les différents facteurs contrôlant la pompe biologique de carbone en Atlantique Nord et dans l’Océan Austral, à proximité des îles Kerguelen, en utilisant notamment deux approches: le Thorium-234 (234Th) et le baryum biogénique (Baxs).En Atlantique Nord, les flux d’export de carbone organique particulaire (POC) augmentent lorsqu’ils sont associés à des minéraux biogéniques (silice biogénique et carbonate de calcium) et lithogènes, capable de lester les particules. L’efficacité d’export, généralement plus faible que précédemment suppos
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Noury, Adrien. "Photonique hybride des nanotubes de carbone." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112199/document.

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L’intégration des communications optiques sur puce offre de vastes promesses en termes de performances et de réduction de la puissance consommée, les canaux optiques ne souffrant pas des nombreuses limitations des canaux métalliques. De plus, l’information codée optiquement permet d’atteindre des débits de données élevés par le biais du multiplexage en longueur d’onde. Afin de conserver la compatibilité avec les composants électroniques, les communications et composants optiques doivent s’intégrer dans la filière silicium. Cependant, ce dernier matériau ne permet pas d’envisager la réalisation
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Stenman, David. "Advanced oxidation technologies for the pulp industry : an investigation on the delignifying properties of the carbonate radical anion /." Stockholm : Department of Chemistry - Nuclear Chemistry, Kungliga tekniska högskolan, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-69.

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Bouchachi, Nawal. "Assessing the role of the microbial carbon pump in carbon cycling in the Mediterranean Sea." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS165.

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La matière organique dissoute (MOD) est l'un des plus grands réservoirs de carbone réduit sur terre, contenant à peu près la même quantité de carbone que le CO2 dans l'atmosphère. Les procaryotes hétérotrophes (PH, bactéries et archées) jouent un rôle clé dans le cycle de la MOD dans l'océan. Ils transforment environ la moitié du carbone fixé par les producteurs primaires pour produire de la biomasse et du CO2. Cependant, le rôle des PH en tant que source de MOD a reçu moins d'attention. Selon la pompe microbienne de carbone (PMC), les PH produisent de la MOD récalcitrante, c'est-à-dire des co
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Dellero, Tarik. "Étude d'un système à absorption solide pour le chauffage et la réfrigération utilisant des fibres de carbone comme additif." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0127.

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Le systeme a absorption pour le stockage de l'energie thermique que nous avons etudie utilise une reaction faisant intervenir le chlorure manganeux (mncl#2) et l'ammoniac (nh#3). Cette reaction est reversible et permet de stocker la chaleur dans un sens et de la restituer dans l'autre sens tandis que la condensation et la l'evaporation de l'ammoniac servant a stocker et restituer le froid. En premier lieu, nous avons montre que l'utilisation des fibres de carbone comme additif permet d'ameliorer la cinetique et le rendement energetique de la reaction etudiee. Nous avons en meme temps trouve de
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Langlois, Benjamin. "Propriétés optiques hors-équilibre des nanotubes de carbone nus ou fonctionnalisés." Thesis, Paris, Ecole normale supérieure, 2014. http://www.theses.fr/2014ENSU0017/document.

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Cette thèse est consacrée à l'étude expérimentale par spectroscopie pompe-sonde femtoseconde des propriétés optiques hors-équilibre de solutions micellaires de nanotubes de carbone. Les propriétés des nanotubes de carbone sont profondément affectées par leur géométrie unidimensionnelle. Les interactions coulombiennes exaltées du fait du confinement quantique des électrons à une dimension donnent naissance à des excitons fortement liés. L'analyse des spectres d'absorption transitoire par la méthode des moments permet une étude des interactions entre excitons. La relaxation des excitons s'avère
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Terrats, Louis. "Le flux de carbone particulaire et le lien avec la communauté phytoplanctonique : une approche par flotteurs-profileurs biogéochimiques." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS550.pdf.

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L'Océan est un acteur majeur du climat en échangeant avec l'atmosphère de grandes quantités de carbone. Le carbone atmosphérique est fixé à la surface de l’océan par le phytoplancton qui le transforme en carbone biogène, dont une partie est transportée vers l’océan profond par des mécanismes physiques et biologiques; il s’agit de la Pompe Biologique de Carbone (BCP). Une infime partie de ce carbone biogène atteindra des profondeurs suffisantes pour être séquestré durant plusieurs siècles avant qu'il ne retourne dans l'atmosphère, régulant les concentrations atmosphériques de CO2. Aujourd'hui,
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Caffin, Mathieu. "Devenir de la fixation d'azote et export de carbone dans l'océan Pacifique tropical sud-ouest." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0475/document.

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Ce travail de thèse porte sur la quantification de la diazotrophie et son influence sur les cycles biogéochimiques dans l'océan de surface Pacifique tropical sud-ouest, une région particulièrement sous-échantillonnée à ce jour. Les objectifs de ce travail étaient (1) de quantifier la fixation de N2 et identifier les principaux acteurs de la diazotrophie dans cette région, (2) d’évaluer l'influence de la fixation de N2 sur la production primaire et sur l'export de carbone, (3) d’identifier les voies de transfert de l’azote fixé dans la chaine trophique planctonique.Il a été mis en évidence que
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Drago, Laetitia. "Analyse globale de la pompe à carbone biologique à partir de données en imagerie quantitative." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS562.

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La pompe à carbone biologique (PCB) joue un rôle central dans le cycle global du carbone océanique, en transportant le carbone de la surface vers les profondeurs et en le séquestrant pendant de longues périodes. Ce travail vise à analyser deux acteurs clés de la PCB : le zooplancton et les particules. Pour cela, nous utilisons les données d'imagerie in situ de l'Underwater Vision Profiler (UVP5) pour étudier deux axes principaux : 1) la distribution globale de la biomasse du zooplancton et 2) l'exportation de carbone dans le contexte d'une efflorescence printanière dans l'Atlantique Nord. À l'
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Books on the topic "Carbonate pump"

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O'Neil, Darcy. Fix the pumps. Art of Drink, 2009.

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Book chapters on the topic "Carbonate pump"

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Kirchman, David L. "Slow Carbon and Deep Time." In Microbes. Oxford University PressNew York, 2024. http://dx.doi.org/10.1093/oso/9780197688564.003.0006.

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Abstract The fast carbon cycle is populated by microbes with lifespans measured in hours, whereas the slow carbon cycle operates over thousands to millions of years. One connection between the two cycles is the calcium carbonate synthesized by the alga coccolithophore, as part of the carbonate pump which sequesters carbon in deep sediments for millions of years. Symbiotic algae help another major producer of calcium carbonate, reef-building corals. Before coccolithophores and corals had evolved, calcium carbonate built up in massive stromatolites during the Precambrian. Fossil stromatolites yield evidence of how and when life first evolved on Earth. Once a rock is exposed to air or water, it is rapidly colonized by microbes, setting in motion forces that end in the rock’s eventual demise. The breakup of carbonate and silicate rocks, or weathering, augmented by microbes, consumes carbon dioxide and regulates global temperatures and Earth’s climate over hundreds to thousands of years.
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Dolman, Han. "The Carbon Cycle." In Biogeochemical Cycles and Climate. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198779308.003.0009.

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The chapter first shows carbon dioxide variability over long geological timescales. The current stocks and fluxes of carbon are then given, for the whole planet and for the atmosphere, ocean and land separately. The main flows of carbon in the ocean, through the biological pump (via uptake through photosynthesis) and the physical pump (via involving chemical transformation uptake in water and production of carbonate), and on land, through photosynthesis (Gross Primary Production) and respiration leading to Net Primary Production, Net Ecosystem Production and Net Biome Production and through the storage of carbon in biomass, are described. Next, carbon interactions during the Paleocene–Eocene Thermal Maximum and glacial–interglacial transitions, thought to involve changes in ocean circulation and upwelling, are examined. The key changes from anthropogenic perturbation of the natural carbon cycle are shown to be due to fossil fuel burning and land-use change (deforestation). The effects of the carbon–climate feedback on temperature and carbon stocks are also shown.
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Gehlen, Marion, and Nicolas Gruber. "Biogeochemical Consequences of Ocean Acidification and Feedbacks to the Earth System." In Ocean Acidification. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199591091.003.0017.

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By the year 2008, the ocean had taken up approximately 140 Gt carbon corresponding to about a third of the total anthropogenic CO2 emitted to the atmosphere since the onset of industrialization (Khatiwala et al. 2009 ). As the weak acid CO2 invades the ocean, it triggers changes in ocean carbonate chemistry and ocean pH (see Chapter 1). The pH of modern ocean surface waters is already 0.1 units lower than in pre-industrial times and a decrease by 0.4 units is projected by the year 2100 in response to a business-as- usual emission pathway (Caldeira and Wickett 2003). These changes in ocean carbonate chemistry are likely to affect major ocean biogeochemical cycles, either through direct pH effects or indirect impacts on the structure and functioning of marine ecosystems. This chapter addresses the potential biogeochemical consequences of ocean acidification and associated feedbacks to the earth system, with focus on the alteration of element fluxes at the scale of the global ocean. The view taken here is on how the different effects interact and ultimately alter the atmospheric concentration of radiatively active substances, i.e. primarily greenhouse gases such as CO2 and nitrous oxide (N2O). Changes in carbonate chemistry have the potential for interacting with ocean biogeochemical cycles and creating feedbacks to climate in a myriad of ways (Box 12.1). In order to provide some structure to the discussion, direct and indirect feedbacks of ocean acidification on the earth system are distinguished. Direct feedbacks are those which directly affect radiative forcing in the atmosphere by altering the air–sea flux of radiatively active substances. Indirect feedbacks are those that first alter a biogeochemical process in the ocean, and through this change then affect the air–sea flux and ultimately the radiative forcing in the atmosphere. For example, when ocean acidification alters the production and export of organic matter by the biological pump, then this is an indirect feedback. This is because a change in the biological pump alters radiative forcing in the atmosphere indirectly by first changing the nearsurface concentrations of dissolved inorganic carbon and total alkalinity.
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Riebesell, Ulf, and Philippe D. Tortell. "Effects of Ocean Acidification on Pelagic Organisms and Ecosystems." In Ocean Acidification. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199591091.003.0011.

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Over the past decade there has been rapidly growing interest in the potential effects of ocean acidification and perturbations of the carbonate system on marine organisms. While early studies focused on a handful of phytoplankton and calcifying invertebrates, an increasing number of investigators have begun to examine the sensitivity to ocean acidification of various planktonic and benthic organisms across the marine food web. Several excellent review articles have recently summarized the rapidly expanding literature on this topic (Fabry et al. 2008; Doney et al. 2009 ; Joint et al. 2011). The focus of this chapter is on the potential ecosystem-level effects of ocean acidification. Starting with a brief review of the basic physical, chemical, and biological processes which structure pelagic marine ecosystems, the chapter explores how organismal responses to perturbations of the carbonate system could scale up in both time and space to affect ecosystem functions and biogeochemical processes. As with many chapters in this volume, and indeed much of the ocean acidification literature at present, our review raises more questions than it answers. It is hoped that these questions will prove useful for articulating and addressing key areas of future research. Complexity in marine pelagic food webs results from the interactions of multiple trophic levels across a range of temporal and spatial scales. The traditional view of marine food webs (Steele 1974) involved a relatively short trophic system in which large phytoplankton (e.g. net plankton such as diatoms) were grazed by a variety of mesozooplankton (e.g. copepods), which were in turn consumed by second-level predators, including many economically important fish and invertebrate species. This ‘classic’ marine food web is typical of high-productivity regions such as coastal upwelling regimes (Lassiter et al. 2006). A characteristic feature of these systems is a strong decoupling between primary production and grazing, which results from the different metabolic rates of consumers and producers and, in many cases, ontogenetic and seasonal delays in the emergence of feeding predators. The uncoupling between phytoplankton and their consumers leads to significant export of organic material out of the euphotic zone, the so-called biological carbon pump (discussed further below).
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Bethke, Craig M. "Petroleum Reservoirs." In Geochemical Reaction Modeling. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195094756.003.0026.

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In efforts to increase and extend production from oil and gas fields, as well as to keep wells operational, petroleum engineers pump a wide variety of fluids into the subsurface. Fluids are injected into petroleum reservoirs for a number of purposes, including: • Waterflooding, where an available fresh or saline water is injected into the reservoir to displace oil toward producing wells. • Improved Oil Recovery (IOR), where a range of more exotic fluids such as steam (hot water), caustic solutions, carbon dioxide, foams, polymers, surfactants, and so on are injected to improve recovery beyond what might be obtained by waterflooding alone. • Near-well treatments, in which chemicals are injected into producing and sometimes injector wells, where they are intended to react with the reservoir rock. Well stimulation techniques such as acidization, for example, are intended to increase the formation's permeability. Alternatively, producing wells may receive “squeeze treatments” in which a mineral scale inhibitor is injected into the formation. In this case, the treatment is designed so that the inhibitor sorbs onto mineral surfaces, where it can gradually desorb into the formation water during production. • Pressure management, where fluid is injected into oil fields in order to maintain adequate fluid pressure in reservoir rocks. Calcium carbonate may precipitate as mineral scale, for example, if pressure is allowed to deteriorate, especially in fields where formation fluids are rich in Ca++ and HCO3- and CO2 fugacity is high. In each of these procedures, the injected fluid can be expected to be far from equilibrium with sediments and formation waters. As such, it is likely to react extensively once it enters the formation, causing some minerals to dissolve and others to precipitate. Hutcheon (1984) appropriately refers to this process as “artificial diagenesis,” drawing an analogy to the role of groundwater flow in the diagenesis of natural sediments (see Chapter 19). Further reaction is likely if the injected fluid breaks through to producing wells and mixes there with formation waters. There is considerable potential, therefore, for mineral scale, such as barium sulfate (see the next section), to form during these procedures.
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Holbourn, Ann, Wolfgang Kuhnt, Karlos G. D. Kochhann, Kenji M. Matsuzaki, and Nils Andersen. "Middle Miocene climate–carbon cycle dynamics: Keys for understanding future trends on a warmer Earth?" In Understanding the Monterey Formation and Similar Biosiliceous Units across Space and Time. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.2556(05).

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ABSTRACT The late early to middle Miocene period (18–12.7 Ma) was marked by profound environmental change, as Earth entered into the warmest climate phase of the Neogene (Miocene climate optimum) and then transitioned to a much colder mode with development of permanent ice sheets on Antarctica. Integration of high-resolution benthic foraminiferal isotope records in well-preserved sedimentary successions from the Pacific, Southern, and Indian Oceans provides a long-term perspective with which to assess relationships among climate change, ocean circulation, and carbon cycle dynamics during these successive climate reversals. Fundamentally different modes of ocean circulation and carbon cycling prevailed on an almost ice-free Earth during the Miocene climate optimum (ca. 16.9–14.7 Ma). Comparison of δ13C profiles revealed a marked decrease in ocean stratification and in the strength of the meridional overturning circulation during the Miocene climate optimum. We speculate that labile polar ice sheets, weaker Southern Hemisphere westerlies, higher sea level, and more acidic, oxygen-depleted oceans promoted shelf-basin partitioning of carbonate deposition and a weaker meridional overturning circulation, reducing the sequestration efficiency of the biological pump. X-ray fluorescence scanning data additionally revealed that 100 k.y. eccentricity-paced transient hyperthermal events coincided with intense episodes of deep-water acidification and deoxygenation. The in-phase coherence of δ18O and δ13C at the eccentricity band further suggests that orbitally paced processes such as remineralization of organic carbon from the deep-ocean dissolved organic carbon pool and/or weathering-induced carbon and nutrient fluxes from tropical monsoonal regions to the ocean contributed to the high amplitude variability of the marine carbon cycle. Stepwise global cooling and ice-sheet expansion during the middle Miocene climate transition (ca. 14.7–13.8 Ma) were associated with dampening of astronomically driven climate cycles and progressive steepening of the δ13C gradient between intermediate and deep waters, indicating intensification and vertical expansion of ocean meridional overturning circulation following the end of the Miocene climate optimum. Together, these results underline the crucial role of the marine carbon cycle and low-latitude processes in driving climate dynamics on an almost ice-free Earth.
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Stephen, Alistair M., Peter W. Linder, and Shirley C. Churms. "Calcium-dependent solubility and rheological properties of some plant polysaccharides." In Gums and stabilisers for the Food industry 6. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780199632848.003.0021.

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Abstract Extraction of pectic material from the leaves of Aloe ferox is largely dependent on the removal of calcium ions. Juice squeezed from leaf, and hot-water extracts of the residual pulp, contain mineral salts and polysaccharides low in uronic acid residues. Treatment with aqueous oxalate, citrate or phosphate permits the extraction from pulp of good yields of polysaccharide that forms viscous solutions and, on restoration of Ca2+ ion, gels. Dialysis of the ammonium salt of the pectic polysaccharide ( 50% -GalEA content) against flowing tap water yielded a gel inside the membrane, the metal ion content of which, in comparison with that in the exterior aqueous medium, showed the relative selectivity coefficients for Ca:Mg:Na:K to be in the approximate ratio 100:20:7:20. Further dialysis against distilled water lowered the percentages of ions present in dried gel to Ca2+ 8.7, Mg2+ 0.14, Na+ 0.32 and K+ 0.23. Steric-exclusion chromatography showed a value of 40 000 for the molecular weight of the soluble pectic salt, raised to 330 000 on addition of Ca2+; this was followed by gel formation. Exudate from Cycad cones, a mannoglucuronoglycan with ramified acidic rhamnoarabinogalactan attached to Man in the core, consists of a weak gel from which a low molecular weight (10 000) fraction is extractable with aqueous ethanol. The residual gel is readily dispersed in aqueous sodium carbonate and then has mol. wt. 180 000, not increased on Ca2+ addition although viscosity lowering does result. The solution properties of the two types of polysaccharide, which resemble those of Khaya grandifoliola gum and gum ghatti respectively, are dependent on the relative dispersions of uronic acid groups in the different molecular structures.
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Morowitz, Harold J. "The Litmus Test." In Entropy and the Magic Flute. Oxford University PressNew York, NY, 1993. http://dx.doi.org/10.1093/oso/9780195081992.003.0036.

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Abstract IT’S DIFFICULT TO READ through a newspaper these days without encountering reference to a litmus test. Whether the article deals with appointing a Supreme Court justice or the director of the National Institutes of Health, the notion of such a test keeps working its way into the political rhetoric. To those of us who first encountered litmus in cherished childhood chemistry sets, the notion of a political litmus test impinges on the psyche in a strange way. Obviously, a more detailed understanding of litmus is called for. It begins, appropriately enough, with the 1911 edition of Encyclopaedia Britannica: LITMUS (apparently a corruption of lacmus, Dutch lacmoes, lac, lac, and moes, pulp, due to association with “lit,” an obsolete word for dye, colour; the Ger. equivalent is Lackmus, Fr. tournesol), a colouring matter which occurs in commerce in the form of small blue tablets, which, however, consist mostly, not of the pigment proper, but of calcium carbonate and sulphate and other matter devoid of tinctorial value. Litmus is extensively employed by chemists as an indicator for the detection of free acids and free alkalis. An aqueous infusion of litmus, when exactly neutralized by an acid, exhibits a violet colour, which by the least trace of free acid is changed to red, while free alkali turns it to blue. The reagent is generally used in the form of test paper bibulous paper dyed red, purple or blue by the respective kind of infusion. Litmus is manufactured in Holland from the same kinds of lichens (species Roccella and Lecanora) as are used for the preparation of archil.
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Conference papers on the topic "Carbonate pump"

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Yao, C. Y., N. C. Hill, and D. A. McVay. "Economic Pilot-Floods of Carbonate Reservoirs Using a Pump-Aided Reverse Dump-Flood Technique." In SPE Mid-Continent Operations Symposium. Society of Petroleum Engineers, 1999. http://dx.doi.org/10.2118/52179-ms.

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Uniyal, Rishabh, Suman Kumar Jaruhar, Manoj Kumar Sarkar, et al. "Key Takeaways from Implementing a Successful Downhole Scale Mitigation & Prevention Job in an Indian Western Offshore ESP Well." In Offshore Technology Conference Brasil. OTC, 2023. http://dx.doi.org/10.4043/32764-ms.

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Abstract Multiple ESP wells in an Indian Offshore Carbonate reservoir were afflicted with inorganic scale deposition chronically. Analysis of recovered deposit samples was carried out and the root cause of deposition established. This was followed by successfully carrying out remedial operations for scale removal and prevention. The experience gained from the same has been elaborated in the paper. Inorganic scale deposition in Electrical Submersible Pumps has been a big cause of concern in many wells of a carbonate reservoir in Indian Offshore. Scale deposition in ESPs causes decrease in pump
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Ali, Mahmoud T. "Reducing Carbon Footprint of Matrix Acidizing in Carbonate Formations. How Much Acid Do We Really Need to Pump?" In SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference & Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209673-ms.

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Abstract With uncertain global economic conditions and calls for lowering carbon footprint, optimizing carbonate matrix acidizing along with other operations is crucial for operators and services companies. Accurate modeling of wormhole growth is inevitable to optimize acid placement in the field. In this study, a field-scale carbonate acidizing model tuned and validated against 600+ linear and radial experiments is presented to optimize/improve field treatments. Unlike previous semi-empirical models, this model presents the wormhole velocity as a function of Darcy's velocity. This model was v
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Muklas, Aliefiyan Nursanda, Candra Kurniawan, Hendra Kusuma, Bonni Ariwibowo, Prayudha Rifqi Safiraldi, and Nayesha Shafira Elthaf Elthaf. "Long Exposure Chelating Acid Treatment to Release ESP Stuck Pump." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205628-ms.

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Abstract In October 2019, electrical submersible pump (ESP) XY-107 experienced an overload shutdown. Troubleshooting actions have been conducted such as reverse rotation, used rocking method, voltage boost, inject gas through the annulus, and even fluid circulation, yet still failed to reactivate the well. Pump stuck condition was suspected and urgently need a solution. A study was performed to determine the cause of pump stuck. XY-107 is produced from limestone formation, therefore suggesting possibility of scale deposit formation in this well. Upon physical inspection inside the well's flowl
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Shehata, Alaaeldin Abdelazim, Emad Nabil, Wael Hassan, Hesham Aql, and Salah Kamal. "Progressing Cavity Pump Challenges in Issaran Heavy Oil fracture carbonate reservoir: Case Study Issaran Field, Eastern Desert, Egypt." In North Africa Technical Conference and Exhibition. Society of Petroleum Engineers, 2012. http://dx.doi.org/10.2118/150299-ms.

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6

Al-Hosni, F., and G. H. Lanier. "Novel Jet-Pump Application Enables Water Flood Project for a Sour Carbonate Reservoir in the Sultanate of Oman." In SPE Artificial Lift Conference and Exhibition. Society of Petroleum Engineers, 2012. http://dx.doi.org/10.2118/163114-ms.

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Harrasi, Mohammed Talib Said Al, Alireza Kazemi, Rami Al-Hmouz, Abdulrahman Aal Abdulsalaam, and Rashid Al Hajri. "Machine Learning Techniques for Inorganic Scale Precipitation Prediction: A Real Field Data from a Carbonate Reservoir." In SPE Conference at Oman Petroleum & Energy Show. SPE, 2024. http://dx.doi.org/10.2118/218796-ms.

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Abstract The precipitation of inorganic scales in the oil and gas industry has been identified as a major issue for flow assurance and the optimization of oil and gas fields due to the damage that these precipitations can cause in reservoirs, well completions, and surface facilities. On the other hand, predicting these precipitations has always been challenging for engineers of petroleum, production, and production facilities. Although many commercial computer programs in the industry can predict inorganic scale precipitations with some accuracy, the majority have many limitations that can neg
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Samouei, Hamidreza, Igor Ivanishin, and Abdollah Orangi. "Novel Class of Retarded, Newtonian, Single-Phase HCl-Based Stimulation Fluids: A Laboratory Characterization." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208813-ms.

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Abstract Novel retarded acids were designed and evaluated by measuring their dissolution and corrosion rates in the laboratory at a temperature of 250°F. Results indicate that depending on the type of the retarder, the acid solutions containing 15 wt% HCl react 1.2–10.7 slower than 15 wt% straight HCl. In addition, novel retarded acids pass the industry standard for corrosion rate of L80, P110, T95, and 13Cr steel grades even with no corrosion inhibitor added to the formulation. Field application of the novel acid systems will provide a series of benefits, including ease to mix and pump, opera
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Nawal, Aamri, Ghadani Adnan, Crampin Tom, and Bos Robert. "Front End Maturation of Thermal Electrical Submersible Pump Design in a Steam Development in the North Oman." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216805-ms.

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Abstract Habur Project will be the second fractured carbonate reservoir using Thermally Assisted Gas Oil Gravity Drainage (TAGOGD) recovery mechanism in Northern Oman. ESPs are selected to provide artificial lift ahead of gas lift to reduce Capex, lower power consumption and to increase well lifting potential. This paper summarizes the approach used to mitigate risks in the deployment of thermal ESPs in potentially extreme corrosive (high H2S and CO2) operating conditions. The ESP operating environment is predicted to be challenging due to a unique combination of conditions: i) high temperatur
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Sidek, Sulaiman, Bahrom Madon, and Mohd Zaidi Jaafar. "Lesson Learned from the Application of Calcium Carbonate Polymer for Water Shut-Off Project in A Carbonate Gas Well, Offshore Borneo Island." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210047-ms.

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Abstract This paper provides valuable insights on the systematic engineering approach, extensive laboratory evaluation and lesson learned on the application of calcium carbonate polymer for water shut-off (WSO) project in a carbonate gas well, offshore Borneo Island, East Malaysia. Excessive water production is a well-known problem faced by petroleum industry, combine with carbonate reservoirs that are notoriously difficult to characterize and challenging to produce, the selection of suitable WSO method is vital to ensure successful and sustainable treatment. However, limited studies have been
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Reports on the topic "Carbonate pump"

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Delwiche, Michael, Boaz Zion, Robert BonDurant, Judith Rishpon, Ephraim Maltz, and Miriam Rosenberg. Biosensors for On-Line Measurement of Reproductive Hormones and Milk Proteins to Improve Dairy Herd Management. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7573998.bard.

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The original objectives of this research project were to: (1) develop immunoassays, photometric sensors, and electrochemical sensors for real-time measurement of progesterone and estradiol in milk, (2) develop biosensors for measurement of caseins in milk, and (3) integrate and adapt these sensor technologies to create an automated electronic sensing system for operation in dairy parlors during milking. The overall direction of research was not changed, although the work was expanded to include other milk components such as urea and lactose. A second generation biosensor for on-line measuremen
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