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Nitrogen uptake rates and new production in the northern Indian Ocean

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Title Nitrogen uptake rates and new production in the northern Indian Ocean
 
Creator Gandhi, Naveen
Prakash, Satya
Ramesh, R
Kumar, Sanjeev
 
Subject New productivity
f ratio
15N tracer technique
northern Indian Ocean
 
Description 362-368
Nitrogen-15 based new production measurements initiated during the last
decade in the northern Indian Ocean are summarized. Two different
biogeochemical provinces in eastern Arabian Sea
have been recognized during the late winter monsoon: less productive southern
(non-bloom) and more productive northern (Noctiluca scintillans bloom) regions.
The southern sector is characterized by low column N-uptake and very low
f-ratio (~5.5 mmol N m-2d-1 and 0.4 respectively). The f
ratio, although low, increased progressively towards north. This increase may
be the effect of more intense winter cooling towards the north. The northern
part is a highly productive zone, with very high N-uptake and significantly
high f ratio (~19 mmol N m-2d-1 and 0.8 respectively). New
production during the pre-monsoon in the Bay of Bengal is
higher than that in the post-monsoon. New production for the region during the
pre-monsoon averages around 5 (±4) mmol N m-2d-1,
almost twice the average value observed during the post-monsoon (2.6 mmol N m-2d-1).
Average f ratio for the entire region increases to 0.70 (±0.1) during pre-monsoon from 0.5 during the post-monsoon
 
Date 2010-11-19T11:27:34Z
2010-11-19T11:27:34Z
2010-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/10672
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.39(3) [September 2010]