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Registros recuperados: 5
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Seasonal and intraseasonal biogeochemical variability in the thermocline ridge of the southern tropical Indian Ocean ArchiMer
Resplandy, L.; Vialard, Jerome; Levy, M.; Aumont, Olivier; Dandonneau, Y..
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) time series shows high variability of surface chlorophyll at seasonal and intraseasonal time scales in the oligotrophic southern tropical Indian Ocean thermocline ridge called the Seychelles-Chagos thermocline ridge (SCTR). The SCTR is characterized by an open ocean upwelling due to local Ekman pumping, which annually maintains the mixed layer (ML) shallow and is responsive to atmospheric forcing and in particular to the Madden-Julian Oscillation (MJO) at an intraseasonal time scale. Here we present an overview of SCTR biogeochemistry and investigate the physical processes driving the response observed at seasonal and intraseasonal time scales. Using satellite observations and biophysical ocean...
Tipo: Text Palavras-chave: Madden julian oscillation; Arabian sea; Rossby waves; Interannual variability; Circulation model; Monsoon; Temperature; Perturbations; Nutrients; Dynamics.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00185/29630/27994.pdf
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RAMA The Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction ArchiMer
Mcphaden, M. J.; Meyers, G.; Ando, K.; Masumoto, Y.; Murty, V. S. N.; Ravichandran, M.; Syamsudin, F.; Vialard, Jerome; Yu, L.; Yu, W..
The Indian Ocean is unique among the three tropical ocean basins in that it is blocked at 25 degrees N by the Asian landmass. Seasonal heating and cooling of the land sets the stage for dramatic monsoon wind reversals, strong ocean atmosphere interactions, and intense seasonal rains over the Indian subcontinent, Southeast Asia, East Africa, and Australia. Recurrence of these monsoon rains is critical to agricultural production that supports a third of the world's population. The Indian Ocean also remotely influences the evolution of El Nino-Southern Oscillation (ENSO), the North Atlantic Oscillation (NAO), North American weather, and hurricane activity. Despite its importance in the regional and global climate system though, the Indian Ocean is the most...
Tipo: Text Palavras-chave: Madden julian oscillation; Tropical indian ocean; Sea heat fluxes; Intraseasonal variability; Equatorial currents; Summer monsoon; Interannual variability; Arabian sea; El nino; Rainfall variability.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00185/29632/27992.pdf
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CIRENE Air-Sea Interactions in the Seychelles-Chagos Thermocline Ridge Region ArchiMer
Vialard, Jerome; Duvel, J. P.; Mcphaden, M. J.; Bouruet-aubertot, P.; Ward, Ben; Key, E.; Bourras, D.; Weller, Robert; Minnett, P.; Weill, A.; Cassou, C.; Eymard, L.; Fristedt, T.; Basdevant, C.; Dandonneau, Y.; Duteil, O.; Izumo, T.; De Boyer Montegut, Clement; Masson, S.; Marsac, F.; Menkes, C.; Kennan, S..
A field experiment in the southwestern Indian Ocean provides new insights into ocean-atmosphere interactions in a key climatic region.
Tipo: Text Palavras-chave: Madden julian oscillation; Southwest indian ocean; Surface temperature; Mixed layer; Intraseasonal variability; Rainfall variability; Tropical cyclones; Western pacific; Dipole mode; El nino.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00185/29634/27990.pdf
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Indo-Pacific Sea surface temperature perturbations associated with intraseasonal oscillations of tropical convection ArchiMer
Duvel, Jean Philippe; Vialard, Jerome.
The intraseasonal variability (ISV; 20-90 days) of the SST is examined using 7 yr of data from the Tropical Rainfall Measuring Mission's (TRMM) Microwave Imager ( TMI). The ISV of the SST is larger in the summer hemisphere and in regions of relatively small ocean mixed layer depth (MLD). For these regions, the reddening of the SST spectrum in regard to the surface flux spectrum suggests that the ISV of the SST is mostly controlled by the integration of the local surface forcing by ocean mixed layer. However, the precise origin of large-scale organized perturbations of the SST also depends on region and season. Since the ISV of the convection is an intermittent phenomenon, the local mode analysis (LMA) technique is used to detect only the ensemble of...
Tipo: Text Palavras-chave: Madden julian oscillation; Western indian ocean; Summer monsoon; Mixed layer; Warm pool; Variability; Fluxes; Model; Atmosphere; Bengal.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00185/29638/27986.pdf
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Ocean-Atmosphere Coupling in the Monsoon Intraseasonal Oscillation: A Simple Model Study ArchiMer
Bellon, Gilles; Sobel, Adam H.; Vialard, Jerome.
A simple coupled model is used in a zonally symmetric aquaplanet configuration to investigate the effect of ocean-atmosphere coupling on the Asian monsoon intraseasonal oscillation. The model consists of a linear atmospheric model of intermediate complexity based on quasi-equilibrium theory coupled to a simple, linear model of the upper ocean. This model has one unstable eigenmode with a period in the 30-60-day range and a structure similar to the observed northward-propagating intraseasonal oscillation in the Bay of Bengal/west Pacific sector. The ocean-atmosphere coupling is shown to have little impact on either the growth rate or latitudinal structure of the atmospheric oscillation, but it reduces the oscillation's period by a quarter. At latitudes...
Tipo: Text Palavras-chave: Madden julian oscillation; Tropical circulation model; Sea surface temperature; Asian summer monsoon; Convective perturbations; Walker circulation; Radiation budget; Indian ocean; Variability; Simulation.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00185/29637/27987.pdf
Registros recuperados: 5
Primeira ... 1 ... Última
 

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