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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.39 [2010] >
IJMS Vol.39(3) [September 2010] >
| 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 |
| Page(s): | 362-368 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.39(3) [September 2010]
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