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

Show simple item record PrasannaKumar, S. Ramaiah, N. Gauns, M. Sarma, V.V.S.S. Muraleedharan, P.M. Raghukumar, S. DileepKumar, M. Madhupratap, M. 2009-01-07T10:50:28Z 2009-01-07T10:50:28Z 2001
dc.identifier.citation Deep-Sea Research (II: Topical Studies in Oceanography), Vol.48; 1115-1126p.
dc.description.abstract 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
dc.language.iso en
dc.publisher Pergamon
dc.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.
dc.subject biological production
dc.subject time series
dc.subject surface temperature
dc.subject mixed layer
dc.subject nitrates
dc.subject chlorophylls
dc.subject primary production
dc.subject satellite data
dc.subject microorganisms
dc.subject zooplankton
dc.subject biomass
dc.subject monsoons
dc.title Physical forcing of biological productivity in the northern Arabian Sea during the northeast monsoon
dc.type Journal Article

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