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Title: Nitrogen uptake rates and new production in the northern Indian Ocean
Authors: Gandhi, Naveen
Prakash, Satya
Ramesh, R
Kumar, Sanjeev
Keywords: New productivity
f ratio
15N tracer technique
northern Indian Ocean
Issue Date: Sep-2010
Publisher: NISCAIR-CSIR, India
Abstract: 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
Description: 362-368
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.39(3) [September 2010]

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