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Physical forcing of biological productivity in the northern Arabian Sea during the northeast monsoon

DRS at CSIR-National Institute of Oceanography

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Title Physical forcing of biological productivity in the northern Arabian Sea during the northeast monsoon
 
Creator PrasannaKumar, S.
Ramaiah, N.
Gauns, M.
Sarma, V.V.S.S.
Muraleedharan, P.M.
Raghukumar, S.
DileepKumar, M.
Madhupratap, M.
 
Subject biological production
time series
surface temperature
mixed layer
nitrates
chlorophylls
primary production
satellite data
microorganisms
zooplankton
biomass
monsoons
 
Description Time-series observations at a nominally fixed location in the northern Arabian Sea (21 degrees N, 64 degrees E) during the Northeast Monsoon (winter, February) of 1997 showed the prevalence of cold sea-surface temperatures (SST) and deep mixed layers resulting from winter cooling and convection. The covariation of nitrate concentrations in the surface layers and concentrations of chlorophyll a and primary production in the euphotic zone with mixed-layer depth (MLD) and wind suggests that carbon fixation was controlled primarily by physical forcing. Cooler waters during winter 1997 relative to winter 1995 were associated with deeper MLDs, higher nitrate concentrations, elevated primary productivity, and higher chlorophyll a concentrations, leading to the inference that even a 1 degree C decrease in SST could lead to significantly higher primary productivity. Satellite data on sea surface temperature (advanced very high-resolution radiometer, AVHRR) and TOPEX/POSEIDON altimeter data suggest that this interannual variation is of basin-wide spatial scale. After the termination of winter cooling and subsequent warming during the Spring Intermonsoon, the Arabian Sea has low primary production. During the latter period, micro-organisms, i.e. heterotrophic bacteria and microzooplankton-proliferate, a feeding mode through the microbial loop that appears to be inherent to mesozooplankton for sustaining their biomass throughout the year in this region
 
Date 2009-01-07T10:50:28Z
2009-01-07T10:50:28Z
2001
 
Type Journal Article
 
Identifier Deep-Sea Research (II: Topical Studies in Oceanography), Vol.48; 1115-1126p.
http://drs.nio.org/drs/handle/2264/1579
 
Language en
 
Rights Copyright [2001]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Pergamon