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Natural isotopic composition of nitrogen in suspended particulate matter in the Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Natural isotopic composition of nitrogen in suspended particulate matter in the Bay of Bengal
 
Creator Kumar, S.
Ramesh, R.
Bhosle, N.B.
Sardessai, S.
Sheshshayee, M.S.
 
Subject suspended particulate matter
nitrogen isotopes
particulate organic nitrogen
hydrography
nutrients (mineral)
salinity
seasonal variations
 
Description The first measurements of nitrogen isotopic composition (delta sup(15) N) in suspended particulate matter (SPM) of the surface Bay of Bengal (BOB) at 24 different locations during pre- (April-May 2003) and post- (September-October 2002) monsoon seasons is presented. The delta sup(15) N values of particulate organic nitrogen (PON) in surface suspended matter of coastal and northern open BOB show mixing between continental inputs and marine sources. Dilution by continental material brought in by rivers leads to consistently lower delta sup(15) N, evident from the relationship between surface salinity and delta sup(15) N. Delta sup(15) N values of surface PON of open ocean locations during both seasons, and also at coastal locations during premonsoon suggest nitrate from deeper waters to be a predominant source of nutrients for phytoplankton. The depth profiles of delta sup(15) N of PON during the premonsoon season at nine different locations indicate an increase in delta sup(15) N by a maximum of 2.8 ppt between euphotic depth and 300 m. These changes are less than those observed in the far eastern Indian Ocean, indicating higher sinking rates of particles ballasted by aggregates of organic and mineral matter in BOB
 
Date 2008-07-02T04:52:35Z
2008-07-02T04:52:35Z
2004
 
Type Journal Article
 
Identifier Biogeosciences, Vol.1; 63-70p.
http://drs.nio.org/drs/handle/2264/1130
 
Language en
 
Rights Copyright [2004]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher The European Geosciences Union