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SMOS reveals the signature of Indian Ocean Dipole events ArchiMer
Durand, F; Alory, Gael; Dussin, Raphael; Reul, Nicolas.
The tropical Indian Ocean experiences an interannual mode of climatic variability, known as the Indian Ocean Dipole (IOD). The signature of this variability in ocean salinity is hypothesized based on modeling and assimilation studies, on account of scanty observations. Soil Moisture and Ocean Salinity (SMOS) satellite has been designed to take up the challenge of sea surface salinity remote sensing. We show that SMOS data can be used to infer the pattern of salinity variability linked with the IOD events. The core of maximum variability is located in the central tropical basin, south of the equator. This region is anomalously salty during the 2010 negative IOD event, and anomalously fresh during the 2011 positive IOD event. The peak-to-peak anomaly exceeds...
Tipo: Text Palavras-chave: SSS; Indian Ocean Dipole; SMOS; ARGO; ENSO.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00161/27234/25481.pdf
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Interannual variability of the Tropical Indian Ocean mixed layer depth ArchiMer
Keerthi, M. G.; Lengaigne, M.; Vialard, Jerome; De Boyer Montegut, Clement; Muraleedharan, P. M..
In the present study, interannual fluctuations of the mixed layer depth (MLD) in the tropical Indian Ocean are investigated from a long-term (1960-2007) eddy permitting numerical simulation and a new observational dataset built from hydrographic in situ data including Argo data (1969-2008). Both datasets show similar interannual variability patterns in relation with known climate modes and reasonable phase agreement in key regions. Due to the scarcity of the observational dataset, we then largely rely on the model to describe the interannual MLD variations in more detail. MLD interannual variability is two to four times smaller than the seasonal cycle. A large fraction of MLD interannual variations is linked to large-scale climate modes, with the exception...
Tipo: Text Palavras-chave: Mixed layer; Interannual variability; Indian Ocean; Indian Ocean Dipole; El Nino/Southern Oscillation; Monsoon.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00124/23564/22771.pdf
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