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Relevant bibliographies by topics / Oceanic carbonate system

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Academic literature on the topic 'Oceanic carbonate system'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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Journal articles on the topic "Oceanic carbonate system"

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Li, Futian, Yaping Wu, David A. Hutchins, Feixue Fu, and Kunshan Gao. "Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO<sub>2</sub> concentrations." Biogeosciences 13, no. 22 (2016): 6247–59. http://dx.doi.org/10.5194/bg-13-6247-2016.

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Abstract. Diel and seasonal fluctuations in seawater carbonate chemistry are common in coastal waters, while in the open-ocean carbonate chemistry is much less variable. In both of these environments, ongoing ocean acidification is being superimposed on the natural dynamics of the carbonate buffer system to influence the physiology of phytoplankton. Here, we show that a coastal Thalassiosira weissflogii isolate and an oceanic diatom, Thalassiosira oceanica, respond differentially to diurnal fluctuating carbonate chemistry in current and ocean acidification (OA) scenarios. A fluctuating carbona

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Humphreys, Matthew P., Ernie R. Lewis, Jonathan D. Sharp, and Denis Pierrot. "PyCO2SYS v1.8: marine carbonate system calculations in Python." Geoscientific Model Development 15, no. 1 (2022): 15–43. http://dx.doi.org/10.5194/gmd-15-15-2022.

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Abstract. Oceanic dissolved inorganic carbon (TC) is the largest pool of carbon that substantially interacts with the atmosphere on human timescales. Oceanic TC is increasing through uptake of anthropogenic carbon dioxide (CO2), and seawater pH is decreasing as a consequence. Both the exchange of CO2 between the ocean and atmosphere and the pH response are governed by a set of parameters that interact through chemical equilibria, collectively known as the marine carbonate system. To investigate these processes, at least two of the marine carbonate system's parameters are typically measured – m

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Calvès, Gérôme, Alan Mix, Liviu Giosan, et al. "The Nazca Drift System – palaeoceanographic significance of a giant sleeping on the SE Pacific Ocean floor." Geological Magazine 159, no. 3 (2021): 322–36. http://dx.doi.org/10.1017/s0016756821000960.

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AbstractThe evolution and resulting morphology of a contourite drift system in the SE Pacific oceanic basin is investigated in detail using seismic imaging and an age-calibrated borehole section. The Nazca Drift System covers an area of 204 500 km2 and stands above the abyssal basins of Peru and Chile. The drift is spread along the Nazca Ridge in water depths between 2090 and 5330 m. The Nazca Drift System was drilled at Ocean Drilling Program Site 1237. This deep-water drift overlies faulted oceanic crust and onlaps associated volcanic highs. Its thickness ranges from 104 to 375 m. The seismi

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Hart, Malcolm B., Wendy Hudson, Christopher W. Smart, and Jarosław Tyszka. "A reassessment of ‘<i>Globigerina bathoniana</i>’ Pazdrowa, 1969 and the palaeoceanographic significance of Jurassic planktic foraminifera from southern Poland." Journal of Micropalaeontology 31, no. 2 (2012): 97–109. http://dx.doi.org/10.1144/0262-821x11-015.

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Abstract. ‘Globigerina Ooze’, Foraminiferal Ooze or Carbonate Ooze as it is now known, is a widespread and highly characteristic sediment of the modern ocean system. Comparable sediments are much less common in the geological record although, as we describe here, a number of Middle Jurassic carbonate sediments with distinctive assemblages from Central Europe fulfil many of the criteria. One important component of these assemblages in the Middle Jurassic is ‘Globigerina bathoniana’ Pazdrowa, 1969, first described from the Bathonian sediments near Ogrodzieniec (Poland). The generic assignment of

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Nisumaa, A. M., S. Pesant, R. G. J. Bellerby, et al. "EPOCA/EUR-OCEANS data-mining compilation on the impacts of ocean acidification." Earth System Science Data Discussions 3, no. 1 (2010): 109–30. http://dx.doi.org/10.5194/essdd-3-109-2010.

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Abstract. The uptake of anthropogenic CO2 by the oceans has led to a rise in the oceanic partial pressure of CO2, and to a decrease in pH and carbonate ion concentration. This modification of the marine carbonate system is referred to as ocean acidification. Numerous papers report the effects of ocean acidification on marine organisms and communities but few have provided details concerning full carbonate chemistry and complementary observations. Additionally, carbonate system variables are often reported in different units, calculated using different sets of dissociation constants and on diff

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Nisumaa, A. M., S. Pesant, R. G. J. Bellerby, et al. "EPOCA/EUR-OCEANS data compilation on the biological and biogeochemical responses to ocean acidification." Earth System Science Data 2, no. 2 (2010): 167–75. http://dx.doi.org/10.5194/essd-2-167-2010.

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Abstract. The uptake of anthropogenic CO2 by the oceans has led to a rise in the oceanic partial pressure of CO2, and to a decrease in pH and carbonate ion concentration. This modification of the marine carbonate system is referred to as ocean acidification. Numerous papers report the effects of ocean acidification on marine organisms and communities but few have provided details concerning full carbonate chemistry and complementary observations. Additionally, carbonate system variables are often reported in different units, calculated using different sets of dissociation constants and on diff

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George, Bivin G., Jyotiranjan S. Ray, and Sanjeev Kumar. "Geochemistry of carbonate formations of the Chhattisgarh Supergroup, central India: implications for Mesoproterozoic global events." Canadian Journal of Earth Sciences 56, no. 3 (2019): 335–46. http://dx.doi.org/10.1139/cjes-2018-0144.

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The Chhattisgarh Supergroup is one of the major Proterozoic marine sedimentary sequences of India. It consists of largely undeformed and unmetamorphosed siliciclastic, volcaniclastic, and carbonate formations deposited in two sub-basins, Hirri and Bharadwar, separated by an Archean greenstone belt. In spite of its apparent importance for Mesoproterozoic oceanic records, very few geochemical studies have been carried in the basin. Here, we present results of our high resolution geochemical and C–O–Sr isotopic studies in two carbonate formations of the supergroup: the Charmuria and the Chandi. W

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Zahn, Rainer, Ahmed Rushdi, Nicklas G. Pisias, Brian D. Bornhold, Bertrand Blaise та Robert Karlin. "Carbonate deposition and benthicδ13C in the subarctic Pacific: implications for changes of the oceanic carbonate system during the past 750,000 years". Earth and Planetary Science Letters 103, № 1-4 (1991): 116–32. http://dx.doi.org/10.1016/0012-821x(91)90154-a.

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Wagener, Thibaut, Nicolas Metzl, Mathieu Caffin, et al. "Carbonate system distribution, anthropogenic carbon and acidification in the western tropical South Pacific (OUTPACE 2015 transect)." Biogeosciences 15, no. 16 (2018): 5221–36. http://dx.doi.org/10.5194/bg-15-5221-2018.

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Abstract. The western tropical South Pacific was sampled along a longitudinal 4000 km transect (OUTPACE cruise, 18 February, 3 April 2015) for the measurement of carbonate parameters (total alkalinity and total inorganic carbon) between the Melanesian Archipelago (MA) and the western part of the South Pacific gyre (WGY). This paper reports this new dataset and derived properties: pH on the total scale (pHT) and the CaCO3 saturation state with respect to aragonite (Ωara). We also estimate anthropogenic carbon (CANT) distribution in the water column using the TrOCA method (Tracer combining Oxyge

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Loretz, Jeremy. "(Invited) Electrochemical Marine Carbon Dioxide Removal (mCDR)." ECS Meeting Abstracts MA2024-01, no. 28 (2024): 1493. http://dx.doi.org/10.1149/ma2024-01281493mtgabs.

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Ebb Carbon is developing an electrochemical system to safely remove carbon dioxide from the atmosphere and store it in the ocean as dissolved inorganic carbon. The core process uses bipolar electrodialysis (BPED) to process incoming seawater into aqueous acid and alkaline seawater. The acid is kept on land and used for beneficial purposes that result in its neutralization. The alkaline seawater is returned to the ocean, shifting the carbonate buffer system toward carbonate, resulting in the removal of CO2 from the air into oceanic bicarbonate as air-sea equilibration is restored. For the mCDR

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Dissertations / Theses on the topic "Oceanic carbonate system"

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Yu, Jimin. "Boron concentration in foraminifera as a proxy for glacial-interglacial change in the oceanic carbonate system." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614120.

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Wimart-Rousseau, Cathy. "Dynamiques saisonnière et pluriannuelle du système des carbonates dans les eaux de surface en mer Méditerranée." Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0503.

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La mer Méditerranée est souvent considérée comme un océan laboratoire pour comprendre les changements globaux liés à l’augmentation de CO2 atmosphérique. Ce travail, basé sur l’étude de données recueilles dans trois régions méditerranéennes, étudie les variations du CO2 océanique dans ce bassin. À l’échelle de la saison, outre les changements de température, le contenu en alcalinité influe sur le contenu en CO2 en Méditerranée orientale, tandis que les changements en carbone total sont responsables des variations dans le bassin occidental. En zone côtière urbanisée, l’émission de CO2 anthropiq

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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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Beer, Christopher James. "Planktic foraminifera, ocean sediments and the palaeo-marine carbonate system." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/208361/.

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Legge, Oliver. "The role of carbonate system dynamics in Southern Ocean CO2 uptake." Thesis, University of East Anglia, 2017. https://ueaeprints.uea.ac.uk/66840/.

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Three years of carbonate system measurements from Ryder Bay on the West Antarctic Peninsula are presented. The strong, asymmetric seasonal cycle of surface water Dissolved Inorganic Carbon (DIC) is quantitatively attributed to four processes:mixing of water masses, air-sea CO2 flux, calcium carbonate precipitation/dissolution and photosynthesis/respiration. In summer, reduced mixing with deeper water, net photosynthesis, and melting glacial ice and sea ice reduce DIC. In winter, mixing with deeper water and net heterotrophy increase DIC, resulting in aragonite saturation states close to 1. Ryd

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Murphy, Paulette P. "The carbonate system in seawater : laboratory and field studies /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/8509.

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Melato, Lebohang Innocentia. "Characterization of the Carbonate System across the Agulhas and Agulhas Return Currents." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15745.

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In this study, we investigate the role that the solubility and biological pumps have on CO₂ variability across the Agulhas Current system ( Agulhas Current and the Agulhas Return Current). The Agulhas Current system transports heat and salt from the Indian Ocean into the South Atlantic Ocean via the Agulhas leakage, which influences the Atlantic Meridional Overturning Circulation (AMOC). This study presents for the first time a characterization of the role the Agulhas Current system (Agulhas and Agulhas Return Currents) has on the uptake of anthropogenic CO₂. Fugacity of carbon dioxide (fCO₂ )

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Chanson, Mareva. "The Changes of the Carbonate Parameters in the Ocean: Anthropogenic and Natural Processes." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/275.

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Since the industrial revolution, CO sub 2 has increased in the atmosphere and about 40% of the increase has been taken up by the ocean. An artifact of increasing CO sub 2 in the ocean is ocean acidification; it changes the calcium carbonate saturation state, which in turn alters the calcification rate of shelled organisms. The purpose of this dissertation is to estimate the changes in the carbonate system in the oceans, and whether these changes are due to natural (biological activity, chemical transformation or mixing of water masses) or anthropogenic (human activities) perturbations. The

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Jiang, Zong-Pei. "Variability and control of the surface ocean carbonate system observed from ships of opportunity." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/361858/.

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The surface ocean plays an important role in the marine carbon cycle linking the atmosphere and the deep ocean. There are substantial variations in the surface ocean carbonate system in different environments and on various time scales, resulting from the interactions of various physical and biogeochemical processes. In this study, the use of Ships of Opportunity (SOO, as carriers of automatic underway measuring systems and platforms for sample collections) was promoted to enhance the surface ocean observing capacity to provide in-situ observations with better temporal resolution and spatial c

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Stella, Sofia. "Analysis of the Variability of Carbonate System Parameters in the North-East Atlantic." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The purpose of this thesis is to analyse the spatial and temporal variability of the aragonite saturation state (ΩAR), commonly used as an indicator of ocean acidification, in the North-East Atlantic. When the aragonite saturation state decreases below a certain threshold, ΩAR <1, calcifying organisms (i.e. molluscs, pteropods, foraminifera, crabs, etc.) are subject to dissolution of shells and aragonite structures. This objective agrees with the challenge 'Ocean, climate change and acidification' of the EU COST Ocean Governance for Sustainability project, which aims to combine the information

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Books on the topic "Oceanic carbonate system"

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Cool-water carbonates: Depositional systems and palaeoenvironmental controls. The Geological Society, 2006.

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Murray, James W. Aquatic Geochemical Oceanography. Oxford University PressOxford, 2025. https://doi.org/10.1093/9780191853241.001.0001.

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Abstract This book is intended as a text for advanced undergraduate and graduate level courses in Aquatic Chemistry, Marine Chemistry and Geochemistry and as a reference for marine geochemists. There is a need for a teaching book that integrates principles and basic tools of aquatic chemistry and ocean distributions, with a geochemical focus. There is a core body of fundamental knowledge that forms the backbone that can be built on and this should be taught first. Strengthening the core aquatic chemical skill set and obtaining a solid background in previous research are two of the main tools t

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Book chapters on the topic "Oceanic carbonate system"

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Bijma, J., H. J. Spero, and D. W. Lea. "Reassessing Foraminiferal Stable Isotope Geochemistry: Impact of the Oceanic Carbonate System (Experimental Results)." In Use of Proxies in Paleoceanography. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58646-0_20.

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García-Ibáñez, Maribel I., and Regina A. Easley-Vidal. "Future Strategy for a Resilient Production and Certification of Seawater Reference Materials for the Carbonate System." In Springer Oceanography. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-2520-8_13.

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Abstract Ocean inorganic carbon research is crucial to quantify the global ocean uptake of atmospheric carbon dioxide (CO2), understand its spatiotemporal variability and mechanisms that control this process, and monitor ocean acidification. This requires high-quality measurements of the seawater carbonate system that rely on the availability of reference materials (RMs). The COVID-19 pandemic highlighted the fragility of the production system of the seawater RMs for the carbonate system, currently depending on one single laboratory. With that in mind, a new model for seawater RMs for the carb

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Henriet, J. P., and S. Guidard. "Carbonate Mounds as a Possible Example for Microbial Activity in Geological Processes." In Ocean Margin Systems. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-05127-6_27.

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Zhai, Wei-dong, Li-wen Zheng, Cheng-long Li, Tian-qi Xiong, and Song-yin Wang. "Changing Nutrients, Dissolved Oxygen and Carbonate System in the Bohai and Yellow Seas, China." In Atmosphere, Earth, Ocean & Space. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4886-4_8.

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Erlenkeuser, H., and U. von Grafenstein. "Stable Oxygen Isotope Ratios in Benthic Carbonate Shells of Ostracoda, Foraminifera, and Bivalvia from Surface Sediments of the Laptev Sea, Summer 1993 and 1994." In Land-Ocean Systems in the Siberian Arctic. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60134-7_39.

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"Oceans and Estuaries." In Biotic Feedbacks in the Global Climatic System, edited by George M. Woodwell and Fred T. Mackenzie. Oxford University PressNew York, NY, 1995. http://dx.doi.org/10.1093/oso/9780195086409.003.0014.

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Abstract The oceans are absorbing carbon dioxide at the rate of 2 ± 1 petagrams of carbon per year. Experience and theory based on experience suggest that the warming projected on the basis of meteorological considerations will reduce the oceanic absorption of CO2• The reduction will be the result of the warming of the surface waters and the reduction of their capacity for holding dissolved CO2, and of a further reduction in absorptive capacity from the gradual titration of the carbonate ion of oceanic water by CO2 from the atmosphere. Both processes speed the accumulation of CO2 in the atmosp

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Waite, Lowell E., Richard B. Koepnick, and James R. Markello. "The Miocene World: A Brief Summary." In Cenozoic Isolated Carbonate Platforms—Focus Southeast Asia. SEPM (Society for Sedimentary Geology), 2023. http://dx.doi.org/10.2110/sepmsp.114.03.

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This paper presents a brief synopsis of the Miocene Epoch, an important transitory chapter in the history of the Earth. It was during the Miocene that the major continents and oceans attained a “modern” configuration in terms of paleogeography and tectonics, oceanic ventilation and circulation, ocean chemistry, and faunal and floral assemblages. It also was during the Miocene that global climate fully transitioned into its current icehouse state, including marked growth of the Antarctic ice sheet and initiation of the Arctic ice cap. Long-term global cooling was controlled by a number of facto

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"Chapter 4 The Oceanic Carbonate System and Calcium Carbonate Accumulation in Deep Sea Sediments." In Geochemistry of Sedimentary Carbonates. Elsevier, 1990. http://dx.doi.org/10.1016/s0070-4571(08)70333-9.

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Bing, Saw Bing, Mu Ramkumar, Jyotsana Rai, et al. "The Evolution of Carbonate Systems During the Oligocene–Miocene Transition: An Example of Subis Limestone, Malaysia." In Cenozoic Isolated Carbonate Platforms—Focus Southeast Asia. SEPM (Society for Sedimentary Geology), 2023. http://dx.doi.org/10.2110/sepmsp.114.13.

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The Subis Platform is considered one of the very few outcrops in Malaysia which records remarkable changes in the growth history of a carbonate system. The Subis Platform is located near Batu Niah, Sarawak. Stratigraphically, the Subis Platform is named the Subis Limestone, a member of the Tangap Formation. This article discusses the older succession of the Subis Limestone at the Subis-2 well and the Hollystone Quarry. Both well and outcrop indicate a slightly older succession based on the occurrence of larger benthic foraminifera and calcareous nannofossils. The age of the Subis Limestone ran

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Dolman, Han. "DETERMINING ATMOSPHERIC AND OCEANIC CARBON DIOXIDE." In Carbon Dioxide through the Ages. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780198869412.003.0009.

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Abstract We get acquainted with measurements of the concentration (mole fraction) of CO2 in the atmosphere. Charles David Keeling started the famous Mauna Loa series in 1958 that is now the iconic symbol of human impact on the climate. He made direct measurements of the mole fraction, rather than the indirect measurements obtained by chemical titration. He noticed that there was a small gradual increase per year in the baseline. Soon he related this to the impact of fossil fuel burning. In 1957 Roger Revelle and Hans Suess stated famously that ‘human beings are now carrying out a large-scale g

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Conference papers on the topic "Oceanic carbonate system"

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Festy, D., and A. M. Beccaria. "Electrochemical Studies of High Strength Low Alloy Steel Corrosion and Cathodic Protection in Seawater: Effect of Hydrostatic Pressure." In CORROSION 1992. NACE International, 1992. https://doi.org/10.5006/c1992-92404.

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Abstract The exploration and exploitation of deep ocean resources are limited by material performance. The reliability of equipment is ensured by material resistance to seawater aggressivity. A special high pressure tank has been designed to perform experiments on the effects of hydrostatic pressure upon metallic alloy corrosion and protection in a seawater environment, including mechanical behaviour. Electrochemical investigations on corrosion and cathodic protection have been performed in natural seawater pressurized up to 30 MPa. Results of electrochemical investigations and chemical analys

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Gray, William, Molly Trudgill, Nathaelle Bouttes, et al. "Glacial carbonate compensation in the Pacific Ocean constrained from paired oxygen and carbonate system reconstructions." In Goldschmidt2023. European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.16800.

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Al-Thani, Jassem A., Connor Izumi, Oguz Yigiterhan, et al. "Ocean Acidification and Carbonate System Geochemistry in the Arabian Gulf." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0030.

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Alkalinity (Alk) and (dissolved inorganic carbon) DIC were measured on high resolution seawater samples, collected on November 2018 and May 2019 at seven stations in the Exclusive Economic Zone (EEZ) of Qatar. Calculated surface PCO2 averaged 472 matm in 2018 and 447 matm in 2019. Thus, the Arabian Gulf is degassing CO2 at present and will not take up atmospheric CO2 until 2042. Ocean acidification is not yet an issue in the EEZ of Qatar. The elevated PCO2 values are due to CaCO3 formation. Normalized NAlk and NDIC were calculated to remove the impact of increasing salinity. NAlk and NDIC decr

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Maksimov, Danil, Alexey Pavlov, and Sigbjørn Sangesland. "Drilling in Karstified Carbonates: Early Risk Detection Technique." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18263.

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Abstract Heterogeneous nature and complex rock properties of carbonate reservoirs makes the drilling process challenging. One of these challenges is uncontrolled mud loss. Caves or a system of cavities could be a high-risk zone for drilling as the mud losses cannot always be controlled by conventional methods, such as mud weight (MW) / equivalent mud weight (ECD) optimization, or by increasing concentration of lost circulation material (LCM) in the drilling mud. Seismic-based detection of such karstification objects is inefficient due to relatively small size, various shapes and low contrast e

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Gupta, Anuj. "Characterization of Matrix Wettability and Mass Transfer From Matrix to Fractures in Carbonate Reservoirs." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84172.

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This paper presents results of an experimental investigation, supported by numerical analysis, to characterize oil recovery from fractured carbonate reservoirs. Imbibition recovery of oil is measured as a function of time for samples with varying wettability and shape factors. One of the objectives of this study is to verify the validity of exponential transfer function for matrix-fracture systems with varying wettability and flow-boundary conditions. Another objective is to establish the possibility of quantitatively determining the wettability of a sample based on history-matching of cumulat

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Lagkaditi, Lydia, Ashok Srivastava, and Anuj Gupta. "Geology-Based Reservoir Model Building for Carbonate Reservoirs." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11328.

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Environment in which carbonate reservoir rocks are deposited was studied by visiting and collecting rock samples from a carbonate reservoir analog located at Jabal Fuwairit in the Northeastern coast of Qatar. The primary objective of this study is to develop methods to characterize carbonate reservoirs. The experimental procedure included collecting samples based on geology, mapping the location and altitudes of the samples using a high-resolution Global Positioning System (GPS) with an altimeter, permeability measurements at selected locations, conducting petrophysical measurements on the sam

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Beemer, Ryan D., Alexandre N. Bandini-Maeder, Jeremy Shaw, Ulysse Lebrec, and Mark J. Cassidy. "The Granular Structure of Two Marine Carbonate Sediments." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77087.

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Calcareous sediments are prominent throughout the low-latitudinal offshore environment and have been known to be problematic for offshore foundation systems. These fascinating soils consist largely of the skeletal remains of single-celled marine organisms (plankton and zooplankton) and can be as geologically complex as their onshore siliceous counter parts. To enable an adequate understanding of their characteristics, in particular, their intra-granular micro-structure, it is important that geotechnical engineers do not forget about the multifaceted biological origins of these calcareous sedim

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Han, Jinju, Youngjin Seo, Juhyun Kim, Sunlee Han, and Youngsoo Lee. "Comparison of Oil Recovery and Carbonate Rock’s Properties Alterations by CO2 Miscible Flooding." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78723.

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This present study indicates experimental investigation about the impact of CO2 flooding on oil recovery and rock’s properties alteration in carbonate reservoir under the miscible condition. In order to compare the effect to initial pore characteristic, two type of carbonate rock was used; an Edward white represents homogeneous mainly consisted micropore, whereas an Indiana limestone represented heterogeneous mainly consisted macropore in this study. Under the miscible condition (9.65 MPa and 40°C), five pore volume of CO2 were injected into oil-wet carbonate rock, which was fully saturated wi

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Boukpeti, Nathalie, Barry Lehane, and J. Antonio H. Carraro. "Strain Accumulation Procedure During Staged Cyclic Loading of Carbonate Sediments." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23692.

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Design of offshore foundation systems requires assessment of the effects of cyclic loading on the soil strength. This paper investigates the applicability of the strain accumulation procedure, which is used to assess the effects of wave loading on the soil strength. Staged undrained cyclic simple shear tests were conducted on a carbonate sediment from the North West shelf of Australia, with varying shear stress amplitude in each stage. The shear strain mobilised at the end of the staged tests is compared with the value predicted by the strain accumulation procedure, using shear strain contours

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Li, Mu, Lufeng Zhang, and Minghui Li. "Study on Acid Fracturing Technology for Carbonate Reservoirs in Ordos Basin." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19296.

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Abstract Acid fracturing, a key stimulation technology, has been widely applied in carbonate formations, which have the complex reservoir space and natural fracture. However, the conventional acid fracturing technology has limitations in target reservoir due to serious acid leakage and rapid acid-rock reaction speed. Therefore, a deep-penetration acid fracturing technology was proposed to enhance the stimulation effect. The reservoir basic physical properties, such as permeability and porosity, microstructure characteristic of pore throats, mineral composition, and rock mechanics characteristi

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Reports on the topic "Oceanic carbonate system"

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Wimart-Rousseau, Cathy, Marine Fourrier, and Fiedler Björn. Development of BGCArgo data quality validation based on an integrative multiplatform approach. EuroSea, 2022. http://dx.doi.org/10.3289/eurosea_d7.2.

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This report presents the results of Task 7.3 on “Development of BGC-Argo data quality validation based on an integrative multiplatform approach”. Observing changes in ocean conditions on the spatiotemporal scales necessary to constrain carbon uptake is a challenge. Defined as an Essential Ocean Variable (EOV) by the Global Ocean Observing System (GOOS, e.g., Tanhua et al., 2019), pH is relevant to assess numerous crucial questions regarding the oceanic evolution in response to the current global changes. However, the large spatiotemporal variability of this carbonate system parameter requires

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Fourrier, Marine. Integration of in situ and satellite multi-platform data (estimation of carbon flux for trop. Atlantic). EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d7.6.

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This report presents the results of task 7.3 on “Quantification of improvements in carbon flux data for the tropical Atlantic based on the multi-platform and neural network approach”. To better constrain changes in the ocean’s capture and sequestration of CO2 emitted by human activities, in situ measurements are needed. Tropical regions are considered to be mostly sources of CO2 to the atmosphere due to specific circulation features, with large interannual variability mainly controlled by physical drivers (Padin et al., 2010). The tropical Atlantic is the second largest source, after the tropi

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Schwinger, Jörg. Report on modifications of ocean carbon cycle feedbacks under ocean alkalinization. OceanNETs, 2022. http://dx.doi.org/10.3289/oceannets_d4.2.

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Ocean Alkalinization deliberately modifies the chemistry of the surface ocean to enhance the uptake of atmospheric CO2. Here we quantify, using idealized Earth system model (ESM) simulations, changes in carbon cycle feedbacks and in the seasonal cycle of the surface ocean carbonate system due to ocean alkalinization. We find that both, carbon-concentration and carbon climate feedback, are enhanced due to the increased sensitivity of the carbonate system to changes in atmospheric CO2 and changes in temperature. While the temperature effect, which decreases ocean carbon uptake, remains small in

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Seifert, Miriam, Claudia Hinrichs, Judith Hauck, and Christoph Völker. New / improved model parametrizations for responses in phytoplankton growth and calcification to changes in alkalinity implemented. OceanNets, 2023. http://dx.doi.org/10.3289/oceannets_d4.5.

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Global biogeochemical ocean models that are currently in place to investigate alkalinity enhancement at a global scale do usually not consider the effects of a changing carbonate system on phytoplankton. We introduce new and modified parameterizations of phytoplankton carbonate systems sensitivities into the biogeochemistry model REcoM. We then compare phytoplankton biomass and net primary production at different atmospheric CO2 concentrations to results from other deliverables (D5.3, 5.6, 5.7) based on experiments and models. The resilience of phytoplankton biomass towards low CO2 concentrati

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Scanlan, E. J., M. Leybourne, D. Layton-Matthews, A. Voinot, and N. van Wagoner. Alkaline magmatism in the Selwyn Basin, Yukon: relationship to SEDEX mineralization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328994.

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Several sedimentary exhalative (SEDEX) deposits have alkaline magmatism that is temporally and spatially associated to mineralization. This report outlines interim data from a study of potential linkages between magmatism and SEDEX mineralization in the Selwyn Basin, Yukon. This region is an ideal study site due to the close spatial and temporal relationships between SEDEX deposits and magmatism, particularly in the MacMillan Pass, where volcanic rocks have been drilled with mineralization at the Boundary deposit. Alkaline volcanic samples were analysed from the Anvil District, MacMillan Pass,

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Riebesell, Ulf. Comprehensive data set on ecological and biogeochemical responses of a low latitude oligotrophic ocean system to a gradient of alkalinization intensities. OceanNets, 2022. http://dx.doi.org/10.3289/oceannets_d5.4.

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The potential biogeochemical and ecological impacts of ocean alkalinity enhancement were tested in a 5-weeks mesocosm experiment conducted in the subtropical, oligotrophic waters off Gran Canaria in September/October 2021. In the nine mesocosms, each with a volume of about 10 m3 inhabiting a natural plankton community, alkalinity enhancement was achieved through addition of a mix of sodium bicarbonate and sodium carbonate, simulating CO2-equilibrated alkalinization in a gradient from control up to twice the natural alkalinity. The response of the enclosed plankton community to the alkalinity a

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