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Registros recuperados: 17
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A 130,000-year record of Levantine Intermediate Water flow variability in the Corsica Trough, western Mediterranean Sea ArchiMer
Toucanne, Samuel; Jouet, Gwenael; Ducassou, Emmanuelle; Bassetti, Maria-angela; Dennielou, Bernard; Minto'O, Charlie Morelle Angue; Lahmi, Marjolaine; Touyet, Nicolas; Charlier, Karine; Lericolais, Gilles; Mulder, Thierry.
Sortable silt particle-size data and stable isotope analyses from the Corsica Trough, western Mediterranean Sea, provide a continuous palaeoceanographic record of the inflow, ventilation and vertical fluctuations of the Levantine Intermediate Water (LIW) in the northern Tyrrhenian Sea for the last 130,000 years. The results presented herein reveal that climate changes drive the Mediterranean intermediate circulation on Milankovitch to millennial time-scales. Intensified intermediate inflow and ventilation in the Corsica Trough occurred throughout the last glacial interval, with a cold / faster – warm / slower pattern existing between the Dansgaard-Oeschger climatic oscillations (including Heinrich events) and the LIW variability. By contrast, a weak...
Tipo: Text Palavras-chave: Levantine Intermediate Water; Mediterranean Sea; Thermohaline circulation; Palaeoceanography.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00054/16506/14023.pdf
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A modelling study of the thermohaline circulation of the Mediterranean Sea: Water formation and dispersal ArchiMer
Haines, K; Wu, Pl.
A model of the whole Mediterranean sea at 0.25 degrees x 0.25 degrees resolution has been run for ten years with a mean seasonal cycle of forcing using NMC winds and a relaxation to NODC surface temperature and salinity. The winter season water formation and dispersal in the model thermocline has been studied using isopycnal diagnostics and potential vorticity as a water mass tracer. In the eastern basin Levantine Intermediate Water (LIW) is formed in the cyclonic Rhodes gyre and moves west in a continuous mass, accumulating and mixing in the centre of the Northern Ionian. The LIW spreading path is identified both from the high salinity and low potential vorticity values on the 28.8 isopycnal surface. Some LIW then spreads west and south towards Sicily,...
Tipo: Text Palavras-chave: PRIMO-O; Circulation thermohaline; Eau levantine intermédiaire; Formation; Modélisation; PRIMO-O; Thermohaline circulation; Levantine Intermediate Water; Water formation; Modelling.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00323/43387/43113.pdf
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Atlantic Meridional Overturning Circulation: Observed Transport and Variability ArchiMer
Frajka-williams, Eleanor; Ansorge, Isabelle J.; Baehr, Johanna; Bryden, Harry L.; Chidichimo, Maria Paz; Cunningham, Stuart A.; Danabasoglu, Gokhan; Dong, Shenfu; Donohue, Kathleen A.; Elipot, Shane; Heimbach, Patrick; Holliday, N. Penny; Hummels, Rebecca; Jackson, Laura C.; Karstensen, Johannes; Lankhorst, Matthias; Le Bras, Isabela A.; Lozier, M. Susan; Mcdonagh, Elaine L.; Meinen, Christopher S.; Mercier, Herle; Moat, Bengamin I.; Perez, Renellys C; Piecuch, Christopher G.; Rhein, Monika; Srokosz, Meric A.; Trenberth, Kevin E.; Bacon, Sheldon; Forget, Gael; Goni, Gustavo; Kieke, Dagmar; Koelling, Jannes; Lamont, Tarron; Mccarthy, Gerard D.; Mertens, Christian; Send, Uwe; Smeed, David A.; Speich, Sabrina; Van Den Berg, Marcel; Volkov, Denis; Wilson, Chris.
The Atlantic Meridional Overturning Circulation (AMOC) extends from the Southern Ocean to the northern North Atlantic, transporting heat northwards throughout the South and North Atlantic, and sinking carbon and nutrients into the deep ocean. Climate models indicate that changes to the AMOC both herald and drive climate shifts. Intensive trans-basin AMOC observational systems have been put in place to continuously monitor meridional volume transport variability, and in some cases, heat, freshwater and carbon transport. These observational programs have been used to diagnose the magnitude and origins of transport variability, and to investigate impacts of variability on essential climate variables such as sea surface temperature, ocean heat content and...
Tipo: Text Palavras-chave: Meridional overturning circulation; Thermohaline circulation; Observing systems; Ocean heat transport; Carbon storage; Moorings; Circulation variability.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00503/61507/65342.pdf
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Circulación y estructura termohalina en una región del Pacífico Oriental (03°16'S-31°23'S) durante un período de El Niño 1997-1998 OceanDocs
Zambrano, E.; Garcés Vargas, J..
El objetivo del presente trabajo es estudiar la estructura termohalina superficial y subsuperficial de una región del Pacífico Sudeste (Guayaquil-Valparaíso), Fig. 1, durante el término de la primavera austral de 1997 para determinar los posibles cambios en la circulación. Para esta fecha se dio comienzo la VII Expedición Ecuatoriana a la Antártida a bordo del B/I ORION y simultáneamente se estaba desarrollando un evento ENOS de intensidad fuerte.
Tipo: Journal Contribution Palavras-chave: El Nino phenomena; Thermohaline circulation; Surface temperature; T/S diagrams; Current direction; Countercurrents; Current measurement; Ocean circulation.
Ano: 1998 URL: http://hdl.handle.net/1834/2316
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Contribución al conocimiento de la oceanografía física del Estrecho Bransfield OceanDocs
Zambrano Q., E.; Cardin, V..
Durante el verano austral de 1988, el Ecuador realizó la Primera Expedición Científica a la Antártica abordo del buque oceanográfico ORION. Se investigó en detalle el Estrecho Bransfiel realizándose un total de 23 estaciones oceanográficas, en las que se tomó información desde la superficie hasta los 500 m. de profundidad, obteniéndose datos de temperatura y salinidad, además de parámetros químicos y bilógicos. En este trabajo se presenta una descripción de las condiciones oceanográficas predominantes durante las fechas del muestreo así como la estructura termohalina del estrecho; mediante el uso de diagramas T-S se identificaron las masas de agua presentes en la región. Del análisis de la topografía dinámica se deduce que la circulación es hacia NE y, en...
Tipo: Journal Contribution Palavras-chave: Temperature; Salinity; Water masses; Thermohaline circulation; Dynamic topography; Oceanographic stations; Physical oceanography; Physical oceanography; Temperature; Salinity.
Ano: 1989 URL: http://hdl.handle.net/1834/3826
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Estudios de algunas características físicas y biológicas de la columna de agua en Bahía Chile-Isla Greenwich OceanDocs
Cornejo, María P.; Arcos, F..
Se determinaron algunas características físicas y biológicas de la columna de agua en Bahía Chile, Isla Greenwich, por medio de la distribución espacial de temperatura, salinidad y clorofila "a", durante el verano austral (febrero de 1990). Las distribuciones verticales de las isotermas, isohalinas, isopicnas e isolíneas de clorfila "a" muestran que la circulación predominante es termohalina, influenciada por la topografía de la bahía, con un flujo subsuperficial que entra por el lado noroccidental de la misma y se dirige hacia el centro (siguiendo la topografía), aflora en el extremo interior y sale superficialmente por el lado oriental.
Tipo: Journal Contribution Palavras-chave: Chemical oceanography; Marine ecology; Salinity; Isotherms; Isopycnics; Thermohaline circulation; Chlorophylls; Chemical oceanography; Marine ecology; Salinity; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_1516; Http://aims.fao.org/aos/agrovoc/c_4609; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 1990 URL: http://hdl.handle.net/1834/3728
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Geostrophic Closure of the Zonally Averaged Atlantic Meridional Overturning Circulation ArchiMer
Sevellec, Florian; Huck, Thierry.
It is typically assumed that the meridional density gradient in the North Atlantic is well and positively correlated with the Atlantic meridional overturning circulation (AMOC). In numerical "water-hosing" experiments, for example, imposing an anomalous freshwater flux in the Northern Hemisphere leads to a slowdown of the AMOC. However, on planetary scale, the first-order dynamics are linked to the geostrophic balance, relating the north-south pressure gradient to the zonal circulation. In this study, these two approaches are reconciled. At steady state and under geostrophic dynamics, an analytical expression is derived to relate the zonal and meridional pressure gradient. This solution is only valid where the meridional density gradient length scale is...
Tipo: Text Palavras-chave: Meridional overturning circulation; Thermohaline circulation; Atm/Ocean Structure/ Phenomena; Ocean circulation; Baroclinic flows; Geographic location/entity; Ekman pumping; Circulation/ Dynamics; Atlantic Ocean.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00323/43456/42843.pdf
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Internal and forced variability along a section between Greenland and Portugal in the CLIPPER Atlantic model ArchiMer
Treguier, Anne-marie; Gourcuff, Claire; Lherminier, Pascale; Mercier, Herle; Barnier, Bernard; Madec, Gurvan; Molines, Jean-marc; Penduff, Thierry; Czeschel, Lars; Boning, Claus.
Numerical models are used to estimate the meridional overturning and transports along the paths of two hydrographic cruises, carried out in 1997 and 2002 from Greenland to Portugal. We have examined the influence of the different paths of the two cruises and found that it could explain 0.4 to 2 Sv of difference in overturning (the precise value is model-dependent). Models show a decrease in the overturning circulation between 1997 and 2002, with different amplitudes. The CLIPPER ATL6 model reproduces well the observed weakening of the overturning in density coordinates between the cruises; in the model, the change is due to the combination of interannual and high-frequency forcing and internal variability associated with eddies and meanders. Examination of...
Tipo: Text Palavras-chave: Ocean model; Thermohaline circulation; North Atlantic; Climate variability; Oceanography.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2199.pdf
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Propagation 3D d'ondes inertielles au sein d'un champ turbulent mésoéchelle ArchiMer
Danioux, Eric.
A current problem in physical oceanography is to identify the sources of energy at the origin of the abyssal mixing associated with thermohaline circulation. An important source is the inertial waves generated by wind. However, the mechanisms driving this energy from the surface to the deep mixing remain poorly understood. We study here the tridimensional propagation of inertial waves in a fully turbulent mesoscale eddy field with a primitive equations numerical model. After presenting a review of works to date, we describe various methods for extracting the inertial signal. The 3D propagation of inertial waves is then described and rationalized. In particular, two dramatic maxima of the vertical velocity have been found around 100 m and 1700 m. The deep...
Tipo: Text Palavras-chave: Potential vorticity; Diapycnal mixing; Thermohaline circulation; Resonance; Inertial waves; Vorticité potentielle; Mélange diapycnal; Circulation thermohaline; Résonance; Ondes inertielles.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-4933.pdf
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Role of bathymetry in Agulhas Current configuration and behaviour - art. no. L23611 ArchiMer
Speich, Sabrina; Lutjeharms, J. R. E.; Penven, P; Blanke, Bruno.
The Agulhas Current forms an important link in the global ocean thermohaline circulation by its role in the interocean exchange of water south of Africa. This process of ring shedding at the current's retroflection is dependent on perturbations to its trajectory that are sensitive to bathymetry. These perturbations may furthermore force the current to intersect shallow regions resulting in substantial changes to its path. A number of other flow characteristics of the system have also been deemed to be influenced by bathymetry. How dependent is Agulhas Current behaviour therefore on the bottom topography? We have used a regional, primitive equation model for initial experimentation. Removing the Agulhas Bank leads to enhanced interocean flux, indicating its...
Tipo: Text Palavras-chave: Inter ocean exchange; Inter ocean flux; Thermohaline circulation; Southwest Africa; Agulhas current.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2308.pdf
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Salinity changes along the upper limb of the Atlantic thermohaline circulation - art. no. L06609 ArchiMer
Blanke, Bruno; Arhan, Michel; Speich, Sabrina.
Lagrangian analyses of a global ocean circulation model quantify the salinity changes experienced by the warm limb of the thermohaline circulation during the northward flow to the Atlantic deep convection regions. 6 Sv out of the estimated 10-Sv transfer from 45 degrees S to 47 degrees N flow through regions of prevailing surface evaporation: the southern and northern formation regions of Salinity Maximum Water and the Gulf of Cadiz/Mediterranean Sea domain. The remaining transport gains salinity through mixing with adjacent waters. As much as 6 Sv flow through the low-salinity surface mixed layer at the latitudes of the ITCZ whose effect annihilates that of the southern region of Salinity Maximum Water. Most of the salinity increase corresponds to the...
Tipo: Text Palavras-chave: Salinity; Atlantic deep convection zones; Upper limb; Thermohaline circulation; Ocean circulation model.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1213.pdf
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The Western Mediterranean Deep Water: A proxy for climate change - art. no. L12608 ArchiMer
Rixen, Michel; Beckers, J; Levitus, S; Antonov, J; Boyer, T; Maillard, Catherine; Fichaut, Michele; Balopoulos, E; Iona, S; Dooley, H; Garcia, M; Manca, B; Giorgetti, A; Manzella, G; Mikhailov, N; Pinardi, N; Zavatarelli, M.
Reconstructions of Mediterranean ocean temperature fields back to 1950 show a proxy relationship between heat content changes in the North Atlantic and the Western Mediterranean Deep Water ( WMDW) formed in the Gulf of Lions in winter, because of consistent air-sea heat fluxes over these areas, strongly correlated to the North Atlantic Oscillation ( NAO).
Tipo: Text Palavras-chave: North Atlantic; West mediterranee; Thermohaline circulation; Temperature variation; Deep water; Water masses; Air sea heat flux.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-760.pdf
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Variabilidad oceanográfica en Ecuador asociada con el evento ENSO 1997-98 OceanDocs
Martínez, R.; Zambrano, E.; Garcés Vargas, J..
El objetivo de este artículo es documentar científicamente la evolución del evento "El Niño" en Ecuador, desde el punto de vista oceanográfico, sugiriendo posibles mecanismos involucrados en este proceso, vinculados a ondas interestacionales Kelvin en el océano (Kessler et al., 1995) que actúan como contraparte a las oscilaciones de 60 a 75 días en la atmósfera (Maden - Julian, 1995) y más específicamente de ondas encontradas en los espectros de nivel medio del mar y TSM en el mar ecuatoriano- colombiano con estas mismas características (Martínez, 1998).
Tipo: Journal Contribution Palavras-chave: Variability; Isotherms; Thermohaline circulation; El Nino phenomena; Surface temperature; Cruises; Kelvin waves; Air temperature; Mean sea level; Salinity charts; Air temperature.
Ano: 2000 URL: http://hdl.handle.net/1834/2245
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Variabilidad oceanográfica en el Estrecho Bransfield asociada con el evento ENSO 1997-1998 OceanDocs
Martínez, R..
Dentro de las actividades científicas contempladas en la VII Expedición Ecuatoriana a la Antártida para enero de 1998 en Buque de Investigación de la Armada B/I Orión efectuó un crucero oceanográfico en el Estrecho Branfield. Se efectuaron 14 estaciones oceanográficas hasta 500 metros, se realizaron mediciones de corriente utilizando un perfilador acústico doppler. Tomando como referencia trabajos anteriores en el área en años sin influencia de eventos cálidos se compararon los parámetros físicos. Luego del análisis se concluye que el evento ENSO 97-98 tuvo repercusiones evidentes en el área de estudio manifestada en dos aspectos básicos: El incremento de la temperatura y la disminución de la salinidad a nivel superficial. Esta variación habría generado un...
Tipo: Journal Contribution Palavras-chave: Variability; Thermohaline circulation; Salinity; Water masses; El Nino phenomena; Cruises; Research vessels; Salinity.
Ano: 1998 URL: http://hdl.handle.net/1834/3838
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Variabilidad oceanográfica en el Estrecho Bransfield asociada con el evento ENSO 1997-1998 OceanDocs
Martínez, R..
Dentro de las actividades científicas contempladas en la VII Expedición Ecuatoriana a la Antártida para enero de 1998 en Buque de Investigación de la Armada B/I Orión efectuó un crucero oceanográfico en el Estrecho Branfield. Se efectuaron 14 estaciones oceanográficas hasta 500 metros, se realizaron mediciones de corriente utilizando un perfilador acústico doppler. Tomando como referencia trabajos anteriores en el área en años sin influencia de eventos cálidos se compararon los parámetros físicos. Luego del análisis se concluye que el evento ENSO 97-98 tuvo repercusiones evidentes en el área de estudio manifestada en dos aspectos básicos: El incremento de la temperatura y la disminución de la salinidad a nivel superficial. Esta variación habría generado un...
Tipo: Journal Contribution Palavras-chave: Variability; Thermohaline circulation; Salinity; Water masses; El Nino phenomena; Cruises; Research vessels; Salinity.
Ano: 1998 URL: http://hdl.handle.net/1834/3838
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Variabilité basse fréquence endogène et exogène de la ciruclation thermohaline ArchiMer
Sevellec, Florian.
One of the consequences of the global warming is the modification of the hydrological cycle and then of the freshwater flux get by the ocean which one of its forcing. The ocean circulation, and more accurately the thermohaline circulation, is able to produce some low frequency variability. We are going to study the impact of the freshwater flux on the thermohaline circulation and mainly on the decadal to millennial variability. In the ocean, as in all dynamical systems, two paradigms coexist for the explanation of the observed variability : it can be endogenous or exogenous. Some outstanding results appear. During the study of endogenous variability in a 2D latitude-depth model, the growth mechanism and the oscillation one of a centennial mode are analyzed...
Tipo: Text Palavras-chave: Optimal perturbation; Freshwater flux impact; Low frequency variability; Thermohaline circulation; Perturbation optimale; Influence du flux d'eau douce; Variabilité basse fréquence; Circulation thermohaline.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-4401.pdf
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Variación estacional de las características químicas de las aguas ecuatoriales subsuperficiales al oeste de las Islas Galápagos en el área de ocurrencia de la corriente de Cromwell (1988-2002) OceanDocs
Burgos, L.; Palacios, C..
Este estudio se lo realizó al oeste de las Islas Galápagos de los diferentes cruceros oceanográficos realizados desde 1988 hasta el 2002, con el propósitoo de conocer las características hidroquímicas de las Aguas Ecuatoriales Subsuperficiales (AESS), las cuales se estima mantienen relación con el flujo y aporte de la Corriente de Cromwell que tiene su mayor incidencia en esta área y su comportamiento estacional frente a los cambios climáticos en época húmeda (Marzo-Mayo) y seca (Agosto-Septiembre).
Tipo: Journal Contribution Palavras-chave: Seasonal variations; Chemical oceanography; Nutrients (mineral); Thermohaline circulation; Dissolved oxygen; Multiship expeditions; Dissolved oxygen; Chemical oceanography; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_1516.
Ano: 2002 URL: http://hdl.handle.net/1834/2234
Registros recuperados: 17
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