Bibliografie tematiche / Deep ocean circulation

Letteratura scientifica selezionata sul tema "Deep ocean circulation"

Autore: Grafiati

Pubblicato: 25 maggio 2024

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Articoli di riviste sul tema "Deep ocean circulation":

Ferrari, Raffaele, Louis-Philippe Nadeau, David P. Marshall, Lesley C. Allison e Helen L. Johnson. "A Model of the Ocean Overturning Circulation with Two Closed Basins and a Reentrant Channel". Journal of Physical Oceanography 47, n. 12 (dicembre 2017): 2887–906. http://dx.doi.org/10.1175/jpo-d-16-0223.1.

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AbstractZonally averaged models of the ocean overturning circulation miss important zonal exchanges of waters between the Atlantic and Indo-Pacific Oceans. A two-layer, two-basin model that accounts for these exchanges is introduced and suggests that in the present-day climate the overturning circulation is best described as the combination of three circulations: an adiabatic overturning circulation in the Atlantic Ocean associated with transformation of intermediate to deep waters in the north, a diabatic overturning circulation in the Indo-Pacific Ocean associated with transformation of abyssal to deep waters by mixing, and an interbasin circulation that exchanges waters geostrophically between the two oceans through the Southern Ocean. These results are supported both by theoretical analysis of the two-layer, two-basin model and by numerical simulations of a three-dimensional ocean model.

Cunningham, Stuart A. "Southern Ocean circulation". Archives of Natural History 32, n. 2 (ottobre 2005): 265–80. http://dx.doi.org/10.3366/anh.2005.32.2.265.

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The Discovery Investigations of the 1930s provided a compelling description of the main elements of the Southern Ocean circulation. Over the intervening years, this has been extended to include ideas on ocean dynamics based on physical principles. In the modern description, the Southern Ocean has two main circulations that are intimately linked: a zonal (west-east) circumpolar circulation and a meridional (north-south) overturning circulation. The Antarctic Circumpolar Current transports around 140 million cubic metres per second west to east around Antarctica. This zonal circulation connects the Atlantic, Indian and Pacific Oceans, transferring and blending water masses and properties from one ocean basin to another. For the meridional circulation, a key feature is the ascent of waters from depths of around 2,000 metres north of the Antarctic Circumpolar Current to the surface south of the Current. In so doing, this circulation connects deep ocean layers directly to the atmosphere. The circumpolar zonal currents are not stable: meanders grow and separate, creating eddies and these eddies are critical to the dynamics of the Southern Ocean, linking the zonal circumpolar and meridional circulations. As a result of this connection, a global three-dimensional ocean circulation exists in which the Southern Ocean plays a central role in regulating the Earth's climate.

Zahn, Rainer. "Deep ocean circulation puzzle". Nature 356, n. 6372 (aprile 1992): 744–45. http://dx.doi.org/10.1038/356744a0.

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Ladant, Jean-Baptiste, Christopher J. Poulsen, Frédéric Fluteau, Clay R. Tabor, Kenneth G. MacLeod, Ellen E. Martin, Shannon J. Haynes e Masoud A. Rostami. "Paleogeographic controls on the evolution of Late Cretaceous ocean circulation". Climate of the Past 16, n. 3 (9 giugno 2020): 973–1006. http://dx.doi.org/10.5194/cp-16-973-2020.

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Abstract. Understanding of the role of ocean circulation on climate during the Late Cretaceous is contingent on the ability to reconstruct its modes and evolution. Geochemical proxies used to infer modes of past circulation provide conflicting interpretations for the reorganization of the ocean circulation through the Late Cretaceous. Here, we present climate model simulations of the Cenomanian (100.5–93.9 Ma) and Maastrichtian (72.1–66.1 Ma) stages of the Cretaceous with the CCSM4 earth system model. We focus on intermediate (500–1500 m) and deep (> 1500 m) ocean circulation and show that while there is continuous deep-water production in the southwestern Pacific, major circulation changes occur between the Cenomanian and Maastrichtian. Opening of the Atlantic and Southern Ocean, in particular, drives a transition from a mostly zonal circulation to enhanced meridional exchange. Using additional experiments to test the effect of deepening of major ocean gateways in the Maastrichtian, we demonstrate that the geometry of these gateways likely had a considerable impact on ocean circulation. We further compare simulated circulation results with compilations of εNd records and show that simulated changes in Late Cretaceous ocean circulation are reasonably consistent with proxy-based inferences. In our simulations, consistency with the geologic history of major ocean gateways and absence of shift in areas of deep-water formation suggest that Late Cretaceous trends in εNd values in the Atlantic and southern Indian oceans were caused by the subsidence of volcanic provinces and opening of the Atlantic and Southern oceans rather than changes in deep-water formation areas and/or reversal of deep-water fluxes. However, the complexity in interpreting Late Cretaceous εNd values underscores the need for new records as well as specific εNd modeling to better discriminate between the various plausible theories of ocean circulation change during this period.

CORLISS, BRUCE H., DOUGLAS G. MARTINSON e THOMAS KEFFER. "Late Quaternary deep-ocean circulation". Geological Society of America Bulletin 97, n. 9 (1986): 1106. http://dx.doi.org/10.1130/0016-7606(1986)97<1106:lqdc>2.0.co;2.

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Birchfield, Edward, e Matthew Wyant. "Diverse Limiting Circulations In A Simple Ocean Box Model". Annals of Glaciology 14 (1990): 330. http://dx.doi.org/10.3189/s0260305500008892.

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A coupled ocean-atmosphere model is formulated, incorporating an ocean comprised of two surface and one deep-ocean boxes, horizontal and vertical mixing, a thermohaline circulation, and forcing by latitudinal differential surface heating and evaporation. Surface fluxes are determined through coupling with a two-box steady-state atmospheric energy-balance model The hydrological cycle, thermohaline circulation and latitudinal exchange rate in the atmosphere are each controlled by an independent parameter. For a weak hydrological cycle, a cold low-salinity deep-ocean equilibrium exists with deep water produced in high latitudes, resembling the modern ocean; for a strong hydrological cycle, a warm saline deep ocean is found with deep water produced in lower latitudes, similar to proposed models of a Cretaceous ocean. More complex solutions exist for an intermediate range of parameters. These include co-existence of both of the above limiting circulations as stable steady states and an oscillatory solution about the cold deep-ocean limit case. In general for this model, the cold deep-ocean case appears less stable than the warm saline deep-ocean case.

Birchfield, Edward, e Matthew Wyant. "Diverse Limiting Circulations In A Simple Ocean Box Model". Annals of Glaciology 14 (1990): 330. http://dx.doi.org/10.1017/s0260305500008892.

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Boyle, E. A. "Glacial/interglacial deep ocean circulation contrast". Chemical Geology 70, n. 1-2 (agosto 1988): 108. http://dx.doi.org/10.1016/0009-2541(88)90504-9.

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Hu, Shijian, Janet Sprintall, Cong Guan, Michael J. McPhaden, Fan Wang, Dunxin Hu e Wenju Cai. "Deep-reaching acceleration of global mean ocean circulation over the past two decades". Science Advances 6, n. 6 (febbraio 2020): eaax7727. http://dx.doi.org/10.1126/sciadv.aax7727.

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Ocean circulation redistributes Earth’s energy and water masses and influences global climate. Under historical greenhouse warming, regional ocean currents show diverse tendencies, but whether there is an emerging trend of the global mean ocean circulation system is not yet clear. Here, we show a statistically significant increasing trend in the globally integrated oceanic kinetic energy since the early 1990s, indicating a substantial acceleration of global mean ocean circulation. The increasing trend in kinetic energy is particularly prominent in the global tropical oceans, reaching depths of thousands of meters. The deep-reaching acceleration of the ocean circulation is mainly induced by a planetary intensification of surface winds since the early 1990s. Although possibly influenced by wind changes associated with the onset of a negative Pacific decadal oscillation since the late 1990s, the recent acceleration is far larger than that associated with natural variability, suggesting that it is principally part of a long-term trend.

Schmittner, Andreas, Tiago A. M. Silva, Klaus Fraedrich, Edilbert Kirk e Frank Lunkeit. "Effects of Mountains and Ice Sheets on Global Ocean Circulation*". Journal of Climate 24, n. 11 (1 giugno 2011): 2814–29. http://dx.doi.org/10.1175/2010jcli3982.1.

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Abstract The impact of mountains and ice sheets on the large-scale circulation of the world’s oceans is investigated in a series of simulations with a new coupled ocean–atmosphere model [Oregon State University–University of Victoria model (OSUVic)], in which the height of orography is scaled from 1.5 times the actual height (at T42 resolution) to 0 (no mountains). The results suggest that the effects of mountains and ice sheets on the buoyancy and momentum transfer from the atmosphere to the surface ocean determine the present pattern of deep ocean circulation. Higher mountains reduce water vapor transport from the Pacific and Indian Oceans into the Atlantic Ocean and contribute to increased (decreased) salinities and enhanced (reduced) deep-water formation and meridional overturning circulation in the Atlantic (Pacific). Orographic effects also lead to the observed interhemispheric asymmetry of midlatitude zonal wind stress. The presence of the Antarctic ice sheet cools winter air temperatures by more than 20°C directly above the ice sheet and sets up a polar meridional overturning cell in the atmosphere. The resulting increased meridional temperature gradient strengthens midlatitude westerlies by ~25% and shifts them poleward by ~10°. This leads to enhanced and poleward-shifted upwelling of deep waters in the Southern Ocean, a stronger Antarctic Circumpolar Current, increased poleward atmospheric moisture transport, and more advection of high-salinity Indian Ocean water into the South Atlantic. Thus, it is the current configuration of mountains and ice sheets on earth that determines the difference in deep-water formation between the Atlantic and the Pacific.

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Tesi sul tema "Deep ocean circulation":

Johnson, Gregory Conrad. "Near-equatorial deep circulation in the Indian and Pacific Oceans /". Thesis, Woods Hole, Mass. : Woods Hole Oceanographic Institution, 1990. http://hdl.handle.net/1912/2637.

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Thesis (Ph. D.)--Woods Hole Oceanographic Institution and Massachusetts Institute of Technology, 1990.
Funding was provided by the Office of Naval Research and a Secretary of the Navy Graduate Fellowship in Oceanography. References : p. 117-121.

Holgate, Simon John. "The Late Ordovician deep ocean circulation and the carbon cycle". Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272742.

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Goodman, Paul Joseph. "The role of North Atlantic Deep Water formation in the thermohaline circulation /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10025.

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LeBel, Deborah Anne. "The large-scale circulation of the deep North Pacific by inverse methods /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10987.

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Richet, Oceane Tess. "Impact of ocean waves on deep waters mixing and large-scale circulation". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX104/document.

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Les différents projets présentés dans cette thèse contribuent à la compréhension de plusieurs aspects clés de la circulation océanique. Le premier aspect que nous étudions porte sur les processus physiques à l'origine du mélange lié à la marée; deux processus ont été mis en évidence. Depuis la latitude critique vers l'équateur, la marée interne transfert son énergie à des ondes plus petite échelle via des instabilités triadiques résonnantes impliquant les ondes proche inertielles. Depuis la latitude critique vers le pôle, les ondes de marée interne continuent de transférer leur énergie à des ondes plus petite échelle, mais étonnamment ce transfert se fait entre la marée interne et des ondes évanescentes.Dans la deuxième étude, nous étudions l'effet d'un courant moyen sur la propagation et la dissipation des ondes de marée interne, générées à la topographie dans des simulations haute résolution. Dans ce cas, la dépendance en latitude de la dissipation de la marée interne est plus lisse et plus proche d'une constante. Ce changement de la dépendance en latitude peut être lié au décalage des fréquences des ondes de marée interne par effet Doppler, ce qui induit la génération d'ondes secondaires plus petite échelle.Dans la troisième étude, nous étudions l'effet d'une perturbation générée en amont sur la circulation dans le bassin amont dû à l'interaction entre la perturbation et un seuil hydrauliquement contrôlé. Les ondes de Kelvin et topographiques de Rossby, générées par une variation de l'afflux d'eau dans le bassin amont, perturbent l'écoulement au dessus du seuil et ainsi l'export d'eau. Cette perturbation est due à la réfraction des ondes sur le seuil à chaque passage, une fois qu'elles ont fait le tour du bassin amont
The various projects presented in this thesis contribute to our understanding of various key aspects of the oceanic circulation. The first aspect that we investigate is the physical processes responsible for this tidal mixing, and we identify two processes. Equatorward of the critical latitude, internal tides transfer their energy to smaller-scale waves via triadic resonant instabilities involving near-inertial waves. Poleward of the critical latitude, internal tides still transfer energy to smaller-scale waves, but surprisingly this transfer takes place between the internal tide and evanescent waves.In the second study, we investigate the effect of a mean current on the propagation and the dissipation of internal tides generated at the topography in high-resolution simulations. In that case, the latitudinal dependence of the tidal energy dissipation is found to be smoother and closer to a constant. This change in the latitudinal dependence can be linked to the Doppler shift of the frequency of the internal tides, which impacts the generation of smaller-scale secondary waves.In the third study, we study the effect of an upstream disturbance on the upstream circulation by interaction with a hydraulically controlled sill. The Kelvin and topographic Rossby waves, generated by a change in the upstream inflow, perturb the flow through the channel and hence the water export. This perturbation is due to the refraction of the waves at the sill at each passage, once they go around the upstream basin

Doherty, Louis Ford. "Deep water renewal in the Strait of Georgia". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26245.

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The seasonal and interannual variation of the water properties and deep water renewal in the Strait of Georgia are examined. Temperature, salinity and dissolved oxygen data acquired over an intensively sampled one year period are presented to show the timing of renewal periods and the variation in properties across the Strait and with depth. The northward propagation of the renewal signal and of its variation across the Strait of Georgia are discussed. A volumetric analysis provides temperature and salinity averages of the Strait of Georgia waters and of renewal water during several stages of each renewal period. Estimates of the renewal volume are calculated using a heat and salt budget method. Data collected in the central part of the Strait over several decades are presented to show the interannual variation in water properties. Correlation coefficients relating the wintertime air temperatures to the deep water properties some time later in the Strait are given.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate

Day, Kate. "On the relationship between deep circulation and a dynamical tracer over the global ocean". Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367708.

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Ninnemann, Ulysses S. "Deep sea sedimentary record of southern ocean physical and chemical heterogeneity : implications for climate and ocean circulation /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035425.

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Lhardy, Fanny. "Role of Southern Ocean sea ice on deep ocean circulation and carbon cycle at the Last Glacial Maximum". Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASJ013.

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La période froide du Dernier Maximum Glaciaire était caractérisée, en regard de notre climat moderne, par une couverture de glace de mer australe accrue, une circulation profonde Atlantique moins profonde et une plus faible concentration en CO2 dans l’atmosphère. Ces différences sont bien connues grâce aux observations indirectes mais difficiles à représenter dans les simulations issues des modèles de climat. En effet, ces modèles simulent fréquemment une concentration en CO2 atmosphérique trop élevée, une circulation océanique trop profonde dans l’Atlantique et une banquise présentant une distribution trop circulaire dans l’océan austral ainsi qu’une étendue hivernale et une amplitude saisonnière trop faibles. Ces désaccords modèle-données observés au Dernier Maximum Glaciaire remettent en cause la représentation numérique de certains processus climatiques essentiels. Plusieurs études soulignent le rôle majeur de la glace de mer australe sur la capacité de stockage de carbone de l’océan et la circulation océanique profonde. Je me suis donc focalisée sur cette région pour mieux com-prendre les processus associés à ce stockage. Grâce aux simulations réalisées avec le modèle système terre iLOVECLIM, j’ai pu démontrer que les incertitudes liées à la représentation des calottes polaires ont un impact limité sur les variables examinées ici. En revanche, d’autres choix de conditions aux limites (affectant le volume de l’océan, l’ajustement de l’alcalinité) peuvent entraîner des modifications importantes du contenu total en carbone de l’océan. Je montre également que l’utilisation d’une paramétrisation simple de la plongée des saumures résultant de la formation de glace de mer permet d’améliorer significativement la simulation de la glace de mer australe, de la circulation océanique profonde et de la concentration en CO2 atmosphérique. Un ensemble de simulations incluant l’impact de différentes paramétrisations océaniques est utilisé pour montrer que la circulation océanique très profonde simulée par notre modèle ne peut être attribuée à une glace de mer australe insuffisante. En revanche, les processus de convection dans l’océan austral semblent clefs pour améliorer à la fois la glace de mer australe, la circulation océanique profonde et la concentration en CO2 atmosphérique auDernier Maximum Glaciaire
Compared to the present-day climate, the cold period of the Last Glacial Maximum was characterized by an expanded sea-ice cover in the Southern Ocean, a shoaled Atlantic deep ocean circulation and a lower atmospheric CO2 concentration. These changes are well-documented by indirect observations but difficult to represent in simulations of climate models. Indeed, these models tend to simulate a too high atmospheric CO2 concentration, a too deep Atlantic deep ocean circulation, and a sea-ice cover with a too circular distribution in the Southern Ocean and a too small winter extent and seasonal amplitude. The model-data discrepancies observed at the Last Glacial Maximum call into question the model representation of some important climate processes. Several studies have underlined the crucial role of the Southern Ocean sea ice on ocean carbon storage capacity and deep circulation. I have therefore focussed on this region to improve our understanding of the processes associated with this storage. Thanks to simulations performed with the Earth System Model iLOVECLIM, I have demonstrated thatthe uncertainties related to ice sheet reconstructions have a limited impact on the variables examined in this study. In contrast, other choices of boundary conditions (influencing the ocean volume and alkalinity adjustment) can yield large changes of carbon sequestration in the ocean. I also show that a simple parameterization of the sinking of brines consequent to sea-ice formation significantly improves the simulated Southern Ocean sea ice, deep ocean circulation and atmospheric CO2 concentration. A set of simulations including the effects of diverse ocean parameterizations is used to show that the too deep ocean circulation simulated by our model cannot be attributed to an insufficient sea-ice cover, whereas convection processes in the Southern Ocean seem crucial to improve both the Southern Ocean sea ice, the deep ocean circulation and the atmospheric CO2 concentration at the Last Glacial Maximum

Lavender, Kara L. "The general circulation and open-ocean deep convection in the Labrador Sea : a study using subsurface floats /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035893.

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Libri sul tema "Deep ocean circulation":

1926-, Teramoto Toshihiko, a cura di. Deep ocean circulation: Physical and chemical aspects. Amsterdam: Elsevier, 1993.

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Johnson, Gregory Conrad. Near-equatorial deep circulation in the Indian and Pacific Oceans. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1990.

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Johnson, Gregory Conrad. Near-equatorial deep circulation in the Indian and Pacific Oceans. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1990.

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Edwards, Christopher A. Dynamics of nonlinear cross-equatorial flow in the deep ocean. Woods Hole, Mass: Massachusetts Institute of Technology, Woods Hole Oceanographic Institution, Joint Program in Oceanography/Applied Ocean Science and Engineering, 1996.

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Chippindale, Marc David. Deep ocean circulation near the Charlie-Gibbs fracture zone. Norwich: University of East Anglia, 1991.

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International Monterey Colloquium on Deep Convection and Deep Water Formation in the Oceans (1990). Deep convection and deep water formation in the oceans: Proceedings of the International Monterey Colloquium on Deep Convection and Deep Water Formation in the Oceans. Amsterdam: Elsevier, 1991.

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Speer, Kevin George. The influence of geothermal sources on deep ocean temperature, salinity, and flow fields. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1988.

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Nakata, Minoru. Pacific deep circulation in world ocean cicrulation model: Sekai kaiyō gaijumkan moderu kora mita Taiheiyō shinsō junkan. Tokyo]: [University of Tokyo, Center for Climate System Research], 1996.

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Oka, Akira. Role of freshwater forcing and salt transport in the formation of the Atlantic deep circulation. Tokyo]: University of Tokyo, Center for Climate System Research, 2003.

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Levy-Ryan, Ellen. Moored current meter and temperature-pressure recorder measurements from the western North Atlantic (high energy benthic boundary layer and abyssal circulation experiments 1983-1984): Volume XXXIX. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1986.

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Capitoli di libri sul tema "Deep ocean circulation":

Tolmazin, David. "Deep-ocean circulation". In Elements of Dynamic Oceanography, 128–51. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4856-3_7.

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Rintoul, Stephen R. "Large-Scale Ocean ocean/oceanic Circulation: Deep Circulation ocean/oceanic deep circulation and Meridional Overturning ocean/oceanic meridional overturning". In Encyclopedia of Sustainability Science and Technology, 5856–81. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_721.

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Rintoul, Stephen R. "Large-Scale Ocean Circulation: Deep Circulation and Meridional Overturning". In Earth System Monitoring, 199–232. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5684-1_10.

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Adkins, Jess F., e Edward A. Boyle. "Age Screening of Deep-Sea Corals and the Record of Deep North Atlantic Circulation Change at 15.4KA". In Reconstructing Ocean History, 103–20. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4197-4_7.

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Saenko, Oleg A. "Projected strengthening of the Southern Ocean winds: Some implications for the deep ocean circulation". In Ocean Circulation: Mechanisms and Impacts—Past and Future Changes of Meridional Overturning, 365–82. Washington, D. C.: American Geophysical Union, 2007. http://dx.doi.org/10.1029/173gm23.

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Wang, Dongxiao. "Middle and Deep Waters Mass and Circulation in the South China Sea". In Ocean Circulation and Air-Sea Interaction in the South China Sea, 159–230. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6262-2_4.

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Boyle, Edward A. "Deep ocean circulation, preformed nutrients, and atmospheric carbon dioxide: Theories and evidence from oceanic sediments". In Mesozoic and Cenozoic Oceans, 49–59. Washington, D. C.: American Geophysical Union, 1986. http://dx.doi.org/10.1029/gd015p0049.

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Sakai, Kotaro, e W. Richard Peltier. "The Influence of Deep Ocean Diffusivity on the Temporal Variability of the Thermohaline Circulation". In Geophysical Monograph Series, 227–42. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm126p0227.

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Schott, Friedrich A., e Peter Brandt. "Circulation and deep water export of the subpolar North Atlantic during the 1990's". In Ocean Circulation: Mechanisms and Impacts—Past and Future Changes of Meridional Overturning, 91–118. Washington, D. C.: American Geophysical Union, 2007. http://dx.doi.org/10.1029/173gm08.

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Skinner, L. C., H. Elderfield e M. Hall. "Phasing of millennial climate events and northeast Atlantic deep-water temperature change since 50 ka BP". In Ocean Circulation: Mechanisms and Impacts—Past and Future Changes of Meridional Overturning, 197–208. Washington, D. C.: American Geophysical Union, 2007. http://dx.doi.org/10.1029/173gm14.

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Atti di convegni sul tema "Deep ocean circulation":

Barbelet, Thea C., Bethany Royce, Charlotte Heo, Molly O. Patterson e Jeffrey T. Pietras. "PLIOCENE DEEP OCEAN CIRCULATION IN THE SOUTHWEST PACIFIC". In Joint 72nd Annual Southeastern/ 58th Annual Northeastern Section Meeting - 2023. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023se-386043.

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Barbelet, Thea, Bethany Royce, Charlotte Heo, Molly O. Patterson e Jeffrey Pietras. "PLIOCENE DEEP OCEAN CIRCULATION IN THE SOUTHWEST PACIFIC". In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-390618.

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Kitazawa, Daisuke, Takero Yoshida, Jinxin Zhou e Sanggyu Park. "Comparative Study on Vertical Circulation in Deep Lakes: Lake Biwa and Lake Ikeda". In 2018 OCEANS - MTS/IEEE Kobe Techno-Ocean (OTO). IEEE, 2018. http://dx.doi.org/10.1109/oceanskobe.2018.8558877.

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Symes, Emily, Chandranath Basak, Jennifer Middleton, Jesse Farmer, Gisela Winckler e Anna Cruz. "Deep Ocean Circulation Changes in the South Pacific During the Mid-Pleistocene Transition". In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.19891.

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Rintoul, Steve R., M. Balmesada, S. Cunningham, B. D. Dushaw, S. Garzoli, A. L. Gordon, P. Heimbach et al. "Deep Circulation and Meridional Overturning: Recent Progress and a Strategy for Sustained Observations". In OceanObs'09: Sustained Ocean Observations and Information for Society. European Space Agency, 2010. http://dx.doi.org/10.5270/oceanobs09.pp.32.

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Ross, Phoebe, Tina van de Flierdt, Dan Lunt, Sebastian Steinig, Philip Sexton e Samantha Hammond. "Global deep ocean circulation through the early Eocene Climatic Optimum - a neodymium isotope perspective". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9743.

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Wang, Ze, James Nielsen e Yuanhang Chen. "Analysis of Thermally Induced Stresses for Effective Remediation of Lost Circulation Through Drilling Induced Fractures". In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-62519.

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Abstract (sommario):

Lost circulation events during drilling are associated with the initiation of new fractures or the reopening of pre-existing fractures from the wellbore. Practices frequently implemented to combat lost circulation, including wellbore strengthening (WBS), are employed by plugging and propping the newly induced and pre-existing fractures to limit further propagation from the wellbore. One observation that was noted is that there is a discrepancy in the performance of lost circulation prevention methods for different temperatures between the fluids used and the surrounding formation. However, it is not yet fully understood how temperature affects pre-existing fractures and newly initiated fractures during these practices. This study discusses how the stress state around fractures is influenced by a change in temperature considering fluid flow into a formation through drilling induced fractures. A finite element analysis with a coupled thermal-hydrologic-mechanical processes simulation was established to demonstrate how the stress redistributes around the fractures while considering fluid invasion and heat transmission. The results of the changing thermal stress around the fractures under various scenarios have been investigated. Included in our analysis is the potential risk of reinitiating fractures. The conclusions from this study indicate that a large temperature difference between the formation rock and fluid flow into the fractures could be a major concern when trying to prevent fracture propagation and control lost circulation events. It could potentially diminish the effect of enhanced hoop stress provided by WBS and fracture plugging by lost circulation materials. Such information is important to facilitate a successful management of lost circulation by taking into accounts the thermal impact of different lost circulation prevention approaches. The results from this paper are particularly important when a large temperature difference exists between circulating fluids and surrounding rock as commonly seen in HPHT and deep water wells.

Kitago, Ryuta, Shigemi Naganawa e Elvar Karl Bjarkason. "Application of Drilling Fluid Circulation Technology to Lifting System for Deep-Sea Mineral Resources". In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-104712.

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Abstract Various types of deep-sea mineral resources such as mud containing rare earth elements, manganese nodules, cobalt-rich crusts, and methane hydrate are found on deep-water seabeds around the world. Lifting systems for mining these resources using a gas lift approach or submersible pumps have been studied by many researchers. As an alternative to these lifting systems, this study proposes a rare earth mud lifting system using a hydraulic jet pump, like those used for artificial lifting in oil wells. The objective of this study is to investigate the design of this lifting system to maximize the mud suction rate of the hydraulic jet pump by numerical simulation. The hydraulic jet pump simulations involved two-phase flow of seawater as the working fluid and rare earth mud slurry as the production fluid. The simulation results showed that all the considered hydraulic jet pump designs could suck in highly viscous rare earth mud slurry at an ocean depth of about 7,000 m. A design with three sets of suction lines and diffusers gave the best performance and could transport a rare earth mud slurry at commercially viable combinations of flow rates and mud concentrations. At a suction line diameter of 1″, the produced mud rate exceeded the commercial reference standard, with mud recovery rates of 10,500 ton/day and 15,800 ton/day when the volumetric mud concentration of the slurry entering the pump was 20% and 40%, respectively.

Shukla, Arvind, Sunil Singh e Tapas Mishra. "Millennial-scale variability in deep ocean circulation in the Eastern Arabian Sea based on the authigenic Neodymium Isotopes". In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.14252.

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Lin, Ray-Qing, e Weijia Kuang. "Ship Motion Instabilities in Coastal Regions". In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79753.

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Ship motion instabilities occur much more frequently in coastal regions than in the deep ocean because both nonlinear wave-wave interactions and wave-current interactions increase significantly as the water depth decreases. This is particularly significant in the coastal regions connecting to the open ocean, since the wave resonant interactions change from the four-equivalent-wave interaction in deep water to the interactions of three local wind waves with a long wave (e.g. swell, edge waves, bottom topography waves, etc.) in shallow water [1, 2], resulting in rapid growth of the incoming long waves. In this study, we use our DiSSEL (Digital, Self-consistent, Ship Experimental Laboratory) Ship Motion Model [3,4,5,6] coupled with our Coastal Wave Model [1,2,11] and an Ocean Circulation Model [7] to simulate strongly nonlinear ship motions in coastal regions, focusing on the ship motion instabilities arising from ship body-surface wave-current interactions.

Rapporti di organizzazioni sul tema "Deep ocean circulation":

Aagaard, K. On the Deep Circulation in the Arctic Ocean. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/126774.

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Menawat, A. S. Carbon dioxide, climate and the deep ocean circulation: Carbon chemistry model. Office of Scientific and Technical Information (OSTI), settembre 1992. http://dx.doi.org/10.2172/6994048.

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Menawat, A. S. Carbon dioxide, climate and the deep ocean circulation: Carbon chemistry model. Final report. Office of Scientific and Technical Information (OSTI), settembre 1992. http://dx.doi.org/10.2172/10105035.

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Rémy, Elisabeth, Romain Escudier e Alexandre Mignot. Access impact of observations. EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d4.8.

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The accuracy of the Copernicus Marine Environment and Monitoring Service (CMEMS) ocean analysis and forecasts highly depend on the availability and quality of observations to be assimilated. In situ observations are complementary to satellite observations that are restricted to the ocean surface. Higher resolution model forecasts are required by users of the CMEMS global and regional ocean analysis and forecasts. To support this with an efficient observational constrain of the model forecast via data assimilation, an increase observation coverage is needed, associated with an improved usage of the available ocean observations. This work exploits the capabilities of operational systems to provide comprehensive information for the evolution of the GOOS. In this report, we analyse the use and the efficiency of the in-situ observations to constrain regional and global Mercator Ocean systems. Physical and biogeochemical variables are considered. The in-situ observations are used either to estimate physical ocean state at global and regional scale via data assimilation or to estimate BGC model parameters. The impact of the physical in situ observations assimilated in open ocean and coastal areas is assessed with numerical data assimilation experiments. The experiments are conducted with the regional 1/36° resolution and global 1/12° resolution systems operated by Mercator Ocean for the Copernicus Marine Service. For the global physical ocean, the focus is on the tropical ocean to better understand how the tropical mooring observations constrain the intraseasonal to daily variability and the complementarity with satellite observations and the deep ocean. The tropical moorings provide unique high frequency observations at different depth, but they are far away from each other, so part of the signal in the observation are decorrelated from one mooring to the others. It is only via an integrated approach, as data assimilation into a dynamical model and complementarity with other observing networks that those observations can efficiently constrain the different scales of variability of the tropical ocean circulation. As the satellite observations brings higher spatial resolution between the tropical moorings but for the ocean surface, we show that the tropical mooring and Argo profile data assimilation constrain the larger scale ocean thermohaline vertical structure (EuroSea D2.2; Gasparin et al., 2023). The representation of the high frequency signals observed at mooring location is also significantly improved in the model analysis compared to a non-assimilative simulation. The ocean below 2000 m depth is still largely under constrained as very few observations exist. Some deep ocean basins, as the Antarctic deep ocean, shows significant trend over the past decade but they are still not accurately monitored. Based on the spread of four deep ocean reanalysis estimates, large uncertainties were estimated in representing local heat and freshwater content in the deep ocean. Additionally, temperature and salinity field comparison with deep Argo observations demonstrates that reanalysis errors in the deep ocean are of the same size as or even stronger than the observed deep ocean signal. OSSE already suggested that the deployment of a global deep Argo array will significantly constrain the deep ocean in reanalysis to be closer to the observations (Gasparin et al., 2020). At regional and coastal scales, the physical ocean circulation is dominated by higher frequency, smaller scale processes than the open ocean which requires different observation strategy to be well monitor. The impact of assimilating high frequency and high-resolution observations provided by gliders on European shelves is analysed with the regional Iberic Biscay and Irish (IBI) system. It was found that repetitive glider sections can efficiently help to constrain the transport of water masses flowing across those sections. BGC ocean models are less mature than physical ocean models and some variable dependencies are still based on empirical functions. In this task, Argo BGC profile observations were used to optimize the parameters of the global CMEMS biogeochemical model, PISCES. A particle filter algorithm was chosen to optimize a 1D configuration of PISCES in the North Atlantic. The optimization of the PISCES 1D model significantly improves the model's ability to reproduce the North Atlantic bloom Recommendations on the in-situ network extensions for real time ocean monitoring are given based on those results, and the one also obtained in the WP2, Task 2.2 where data assimilation experiments but with simulated observations where conducted. Argo extension and the complementarity with satellite altimetry was also extensively studied. (EuroSea Deliverable ; D4.8)

Kopte, Robert. OSADCP Toolbox. GEOMAR, 2024. http://dx.doi.org/10.3289/sw_2_2024.

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Vessel-mounted Acoustic Doppler Current Profilers (ADCPs) provide velocity profiles of the upper ocean along the ship track. They are a key tool in oceanographic research to study the oceanic circulation and the associated distribution of mass, heat, contaminants and other tracers. In order to obtain high-quality ocean current data from vessel-mounted ADCP measurements, a number of requirements must be met, from system installation and data acquisition measures to certain essential processing steps. Here, we collect key points on ADCP data acquisition in general and on the characteristics and requirements of vessel-mounted deployments. We summarize general post-processing guidelines and present an open-source Python toolbox called OSADCP for scientists to convert, clean, calibrate and organize binary raw vessel-mounted ADCP data for scientific use. The toolbox is designed to process ADCP measurements in deep water by Teledyne RDI Ocean Surveyor ADCPs and the data acquisition software VMDAS. An extended version of OSADCP is continuously developed as part of a data management project for the German oceanographic research fleet. The corresponding workflow was designed to ensure a standardized and reliable ADCP data transfer from the sensor to the repository. It is described here as one example for scientific data management that follows FAIR data guidelines.

Knowledge summary, A deep-sea experiment on carbon dioxide storage in oceanic crust. CDRmare, 2022. http://dx.doi.org/10.3289/cdrmare.20.

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On Iceland, water enriched with carbon dioxide has been injected into the upper ocean crust since 2014 – and successfully. The carbon dioxide mineralises within a short time and is firmly bound for millions of years. However, since ocean crust only rises above sea level in a few places on Earth, researchers are currently investigating the option of injecting carbon dioxide into ocean regions where huge areas of suitable basalt crust lie at medium to great water depths. One possible advantage: In the deep sea subsurface, the carbon dioxide would either be stable as a liquid or dissolve in the seawater circulating in the rock. Due to the high pressure, both the liquid carbon dioxide and the carbon dioxide-water mixture would be heavier than seawater, making leakage from the underground unlikely. But would carbon dioxide storage in the deep sea subsurface be technically feasible and ultimately also economically viable? The research mission CDRmare provides answers – with the help of the world's first deep-sea research experiment on carbon dioxide storage on cooled flanks of the Mid-Atlantic Ridge.

A deep-sea experiment on carbon dioxide storage in oceanic crust. CDRmare, 2022. http://dx.doi.org/10.3289/cdrmare.21.

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Abstract (sommario):

On Iceland, water enriched with carbon dioxide has been injected into the upper ocean crust since 2014 – and successfully. The carbon dioxide mineralises within a short time and is firmly bound for millions of years. However, since ocean crust only rises above sea level in a few places on Earth, researchers currently investigate the option of injecting carbon dioxide into ocean regions where huge areas of suitable basalt crust lie at medium to great water depths. One possible advantage: In the deep sea subsurface, the carbon dioxide would either be stable as a liquid or dissolve in the seawater circulating in the rock. Due to the high pressure, both the liquid carbon dioxide and the carbon dioxide-water mixture would be heavier than seawater, making leakage from the underground unlikely. But would carbon dioxide storage in the deep sea subsurface be technically feasible and ultimately also economically viable? The research mission CDRmare provides answers – with the help of the world's first deep-sea research experiment on carbon dioxide storage on cooled flanks of the Mid-Atlantic Ridge.