Signature of terrestrial influence on nitrogen isotopic composition of suspended particulate matter in the Bay of Bengal

Nitrogen concentration and its isotopic composition in surface suspended matter have been measured at 24 different locations during the post-monsoon season in the Bay of Bengal. In general, the stable nitrogen isotopic composition of surface particulate organic nitrogen (PON) in the Bay of Bengal ap...

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Bibliographic Details
Published in:Current science (Bangalore) 2005-03, Vol.88 (5), p.770-774
Main Authors: Kumar, Sanjeev, Ramesh, R., Sheshshayee, M. S., Sardesai, S., Patel, P. P.
Format: Article
Language:English
Subjects:
Ammonia
Chemical composition
Chemical suspensions
Marine
Nitrates
Nitrogen
Oceans
Particulate matter
RESEARCH COMMUNICATIONS
Sea water
Seas
Surface water
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Summary:Nitrogen concentration and its isotopic composition in surface suspended matter have been measured at 24 different locations during the post-monsoon season in the Bay of Bengal. In general, the stable nitrogen isotopic composition of surface particulate organic nitrogen (PON) in the Bay of Bengal appears to be a mixture of particulate matter from the continent and marine phytoplankton, the latter having inherited the isotopic composition of deeper nitrate. Higher δ15N values of surface PON in open ocean locations could be due to the supply of nitrate with higher δ15N values. However, offshore locations have been diluted by the continental influence leading to low δ15N values in PON.
ISSN:0011-3891