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Seasonal cycle of physical forcing and biological response in the Bay of Bengal

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Title Seasonal cycle of physical forcing and biological response in the Bay of Bengal
 
Creator Kumar, S Prasanna
Nuncio, M
Narvekar, Jayu
Ramaiah, N
Sardesai, S
Gauns, M
Fernandes, V
 
Subject Stratification
Advection
Wind-mixing
Mixed layer depth
Cold-core eddy
Chlorophyll
Primary productivity
Nutrients
 
Description 388-405
Seasonal cycle of the
physical processes and the biological response in the Bay of Bengal were
studied using co-located physical, chemical and
biological data collected along the central and the western Bay covering four
seasons from 2001 to 2006. The spring intermonsoon was characterized by warm
surface waters with high salinity and less stable water column compared to
summer and fall intermonsoon. During summer, freshening due to precipitation
and river discharge strongly stratified the upper water column, especially in
the north. Continued freshening and presence of low salinity waters during fall
intermonsoon sustained the stratification. Presence of cold core eddies
controlled the nutrient flux to the upper layers. During winter, the net heat
loss from the sea surface led to the surface cooling with coldest sea surface
temperature. Comparatively stronger winds were able to initiate wind-mixing as
the water column stability was the least during this period. Less stable water
column also supported an efficient nutrient supply by cold core eddies. It
resulted in the highest mean column integrated chlorophyll as well as primary
productivity. Perennially low surface chlorophyll in the Bay of Bengal was
largely controlled by the physical processes such as stratification and reduced
wind-mixing. The moderate column integrated chlorophyll biomass as well as
primary productivity throughout the year was regulated by the presence of
mesoscale eddies.
 
Date 2010-11-19T11:28:23Z
2010-11-19T11:28:23Z
2010-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/10675
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.39(3) [September 2010]