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Registros recuperados: 7
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A surface “super-convergence” pathway connecting the South Indian Ocean to the subtropical South Pacific gyre ArchiMer
Maes, C.; Grima, N.; Blanke, Bruno; Martinez, E.; Paviet-salomon, T.; Huck, Thierry.
We study the dispersion and convergence of marine floating material by surface currents from a model reanalysis that represents explicitly mesoscale eddy variability. Lagrangian experiments about the long-term evolution (29 years) of an initially homogeneous concentration of particles are performed at global scale with horizontal current at ¼° resolution and refreshed daily over the 1985-2013 period. Results confirm and document the five known sites of surface convergence at the scale of individual oceanic basins, but also reveal a convergent pathway connecting the South Indian subtropical region with the convergence zone of the South Pacific through the Great Australian Bight, the Tasman Sea and the southwest Pacific Ocean. This “super-convergent” pathway...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00425/53631/54461.pdf
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Impacts of mesoscale activity on the water masses and circulation in the Coral Sea ArchiMer
Rousselet, L.; Doglioli, A. M.; Maes, C.; Blanke, Bruno; Petrenko, A. A..
The climatological vision of the circulation within the Coral Sea is today well established with the westward circulation of two main jets, the North Caledonian Jet (NCJ) and the North Vanuatu Jet (NVJ) as a consequence of the separation of the South Equatorial Current (SEC) on the islands of New Caledonia, Vanuatu, and Fiji. Each jet has its own dynamic and transports different water masses across the Coral Sea. The influence of mesoscale activity on mean flow and on water mass exchanges is not yet fully explored in this region of intense activity. Our study relies on the analysis of in situ, satellite, and numerical data. Indeed, we first use in situ data from the Bifurcation cruise and from an Argo float, jointly with satellite-derived velocities, to...
Tipo: Text Palavras-chave: Eddy circulation; Water masses mixing; Jets connection.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00353/46443/46188.pdf
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Importance of the Equatorial Undercurrent on the Sea Surface Salinity in the Eastern Equatorial Atlantic in boreal spring ArchiMer
Da-allada, Casimir Yelognisse; Jouanno, J.; Gaillard, Fabienne; Kolodziejczyk, Nicolas; Maes, C.; Reul, Nicolas; Bourles, B..
The physical processes implied in the sea surface salinity (SSS) increase in the equatorial Atlantic Cold Tongue (ACT) region during boreal spring and the lag observed between boreal spring SSS maximum and sea surface temperature (SST) summer minimum are examined using mixed-layer salinity budgets computed from observations and model during the period 2010-2012. The boreal spring SSS maximum is mainly explained by an upward flux of high salinity originating from the core of the Equatorial Undercurrent (EUC) through vertical mixing and advection. The vertical mixing contribution to the mixed-layer salt budget peaks in April-May. It is controlled primarily by i) an increased zonal shear between the surface South Equatorial Current and the subsurface EUC and...
Tipo: Text Palavras-chave: Atlantic Cold Tongue; SMOS SSS; Model; EUC salinity maximum; Vertical processes.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00363/47396/47388.pdf
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Modeling the Wake of the Marquesas Archipelago ArchiMer
Raapoto, H.; Martinez, E.; Petrenko, A.; Doglioli, A. M.; Maes, C..
In this study, a high-resolution (∼2.5 km) numerical model was set up to investigate the fine-scale activity within the region of the Marquesas archipelago. This has never been performed before. The robustness of the model results is assessed by comparison with remote sensing and in situ observations. Our results highlight regions of warm waters leeward of the different islands with high eddy kinetic energy (EKE) on their sides. The analysis of energy conversion terms reveals contributions to EKE variability by wind, baroclinic, and barotropic instabilities. The use of a geometry-based eddy detection algorithm reveals the generation of cyclonic and anticyclonic eddies in the wake of the largest islands, with both an inshore and offshore effect. Maximum...
Tipo: Text Palavras-chave: Marquesas archipelago; Island wakes; Fine-scale processes; Eddy kinetic energy; Eddy detection; Island mass effect.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00428/53986/55146.pdf
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Satellite and In Situ Salinity: Understanding Near-surface Stratification and Sub-footprint Variability ArchiMer
Boutin, J.; Chao, Y.; Asher, W. E.; Delcroix, T.; Drucker, R.; Drushka, K.; Kolodziejczyk, Nicolas; Lee, T.; Reul, Nicolas; Reverdin, G.; Schanze, J.; Soloviev, A.; Yu, L.; Anderson, J.; Brucker, L.; Dinnat, E.; Santos-garcia, A.; Jones, W. L.; Maes, C.; Meissner, T.; Tang, W.; Vinogradova, N.; Ward, B..
Remote sensing of salinity using satellite-mounted microwave radiometers provides new perspectives for studying ocean dynamics and the global hydrological cycle. Calibration and validation of these measurements is challenging because satellite and in situ methods measure salinity differently. Microwave radiometers measure the salinity in the top few centimeters of the ocean, whereas most in situ observations are reported below a depth of a few meters. Additionally, satellites measure salinity as a spatial average over an area of about 100x100 km2. In contrast, in situ sensors provide pointwise measurements at the location of the sensor. Thus, the presence of vertical gradients in, and horizontal variability of, sea surface salinity complicates comparing...
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Ano: 2016 URL: https://archimer.ifremer.fr/doc/00300/41095/40268.pdf
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Seasonal and interannual variability of the eastern tropical Pacific fresh pool ArchiMer
Guimbard, Sebastien; Reul, Nicolas; Chapron, Bertrand; Umbert, M.; Maes, C..
The Eastern Pacific Fresh Pool (EPFP) is a large region of low Sea Surface Salinity (SSS) defined by values lower than 34 practical salinity scale within [5°S-30°N, 75°W-180°W]. The fresh pool dynamically responds to strong regional and seasonally varying ocean-atmosphere-land interactions (including monsoon rain, trade and gap winds and strong currents). Using more than five years of Soil Moisture and Ocean Salinity (SMOS) satellite sea surface salinity (SSS) and complementary satellite wind, rain, currents, and sea surface temperature data together with a historical ensemble of in situ products, the present study explores the seasonal and interannual dynamics of the fresh pool over the period 2004-2015. An important interannual variability of the maximal...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00371/48245/48380.pdf
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The Southwest Pacific Ocean circulation and climate experiment (SPICE) ArchiMer
Ganachaud, A.; Cravatte, S.; Melet, A.; Schiller, A.; Holbrook, N. J.; Sloyan, B. M.; Widlansky, M. J.; Bowen, M.; Verron, J.; Wiles, P.; Ridgway, K.; Sutton, P.; Sprintall, J.; Steinberg, C.; Brassington, G.; Cai, W.; Davis, R.; Gasparin, F.; Gourdeau, L.; Hasegawa, T.; Kessler, W.; Maes, C.; Takahashi, K.; Richards, K. J.; Send, U..
The Southwest Pacific Ocean Circulation and Climate Experiment (SPICE) is an international research program under the auspices of CLIVAR. The key objectives are to understand the Southwest Pacific Ocean circulation and the South Pacific Convergence Zone (SPCZ) dynamics, as well as their influence on regional and basin-scale climate patterns. South Pacific thermocline waters are transported in the westward flowing South Equatorial Current (SEC) toward Australia and Papua-New Guinea. On its way, the SEC encounters the numerous islands and straits of the Southwest Pacific and forms boundary currents and jets that eventually redistribute water to the equator and high latitudes. The transit in the Coral, Solomon, and Tasman Seas is of great importance to the...
Tipo: Text Palavras-chave: SPICE; Southwest pacific; Jets; SPCZ; Spiciness.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00244/35504/34008.pdf
Registros recuperados: 7
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