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Seasonal variability of salinity and salt transport in the northern Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Seasonal variability of salinity and salt transport in the northern Indian Ocean
 
Creator D’Addezio, J.M.
Subrahmanyam, B.
Nyadjro, E.S.
Murty, V.S.N.
 
Subject OCEANOGRAPHY AND LIMNOLOGY
METEOROLOGY AND CLIMATOLOGY
OCEANOGRAPHY AND LIMNOLOGY
 
Description Analyses using a suite of observational datasets (Aquarius and Argo) and model simulations are carried out to examine the seasonal variability of salinity in the northern Indian Ocean (NIO). The model simulations include Estimating the Circulation and Climate of the Ocean, Phase II (ECCO2), the European Centre for Medium-Range Weather Forecasts–Ocean Reanalysis System 4 (ECMWF–ORAS4), Simple Ocean Data Assimilation (SODA) reanalysis, and the Hybrid Coordinate Ocean Model (HYCOM). The analyses of salinity at the surface and at depths up to 200 m, surface salt transport in the top 5-m layer, and depth-integrated salt transports revealed different salinity processes in the NIO that are dominantly related to the semiannual monsoons. Aquarius proves a useful tool for observing this dynamic region and reveals some aspects of sea surface salinity (SSS) variability that Argo cannot resolve. The study revealed large disagreement between surface salt transports derived from observed- and analysis-derived salinity fields. Although differences in SSS between the observations and the model solutions are small, model simulations provide much greater spatial variability of surface salt transports due to finer detailed current structure. Meridional depth-integrated salt transports along 6°N revealed dominant advective processes from the surface toward near-bottom depths. In the Arabian Sea (Bay of Bengal), the net monthly mean maximum northward (southward) salt transport of ~50 × 106 kg s -1 occurs in July, and annual-mean salt transports across this section are about -2.5 × 106 kg s -1 3 × 106 kg s -1)
 
Date 2015-10-26T09:10:00Z
2015-10-26T09:10:00Z
2015
 
Type Journal Article
 
Identifier Journal of Physical Oceanography, vol.45(7); 2015; 1947-1966
http://drs.nio.org/drs/handle/2264/4808
 
Language en
 
Rights An edited version of this paper was published by American Meteorological Society. Copyright [2015] American Meteorological Society
 
Publisher American Meteorological Society