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Variability in biological responses influenced by upwelling events in the Eastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Variability in biological responses influenced by upwelling events in the Eastern Arabian Sea
 
Creator Habeebrehman, H.
Prabhakaran, M.P.
Jacob, J.
Sabu, P.
Jayalakshmi, K.J.
Achuthankutty, C.T.
Revichandran, C.
 
Subject primary production
seasonal variations
phytoplankton
chlorophylls
 
Description This study documents the result of field observations from the southeastern Arabian Sea during onset, peak and late phases of summer monsoon. The pronounced variations in phytoplankton standing stock (chlorophyll a), primary production, meso zooplankton standing stock and physico-chemical variables were examined according to the different stages of upwelling i.e., newly upwelled (Type-1), mature (Type-2) and aged upwelling (Type-3). Type-1 stage was observed along the inshore waters off 8-10 degrees N during the onset of summer monsoon and along north of 13 degrees N during peak and late summer monsoon. This stage was characterized by high wind stress (approx. 0.72 dynes/cm sup(2)) and upsloping of isotherms and isolines of nitrate towards the coast. Type-2 stage was identified along the inshore regions of 8-11.5 degrees N during peak summer monsoon with relatively stable and nutrient rich (greater than 2 mu M NO sub(3)) cold (greater than 27.7 degrees N) surface waters. Type-3 stage was observed along 8 degrees N transect during the late summer monsoon, which was characterized by relaxed wind stress. Upwelling signatures were not prominent along this transect. Relatively higher biological production was observed during Type-2 stage. Distribution of meso zooplankton biomass followed the same trend as that of chlorophyll a and primary production. Northward propagation of upwelling was observed as summer monsoon proceeded. Spatial variations in biological production were observed in the Arabian Sea as a consequence of the variations in the intensity of upwelling.
 
Date 2008-11-24T10:57:38Z
2008-11-24T10:57:38Z
2008
 
Type Journal Article
 
Identifier Journal of Marine Systems, vol.74; 545-560p.
http://drs.nio.org/drs/handle/2264/1491
 
Language en
 
Rights Copyright [2008]. 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 Elsevier