Environmental controls on new and primary production in the northern Indian Ocean.

Singh, Arvind and Ramesh, R. (2015) Environmental controls on new and primary production in the northern Indian Ocean. Progress in Oceanography, 131 . pp. 138-145. DOI 10.1016/j.pocean.2014.12.006.

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New production is comparable in the Arabian Sea and the Bay of Bengal.Primary production is moderate in the Bay of Bengal, and the western Arabian Sea is the most productive part of the northern Arabian Sea.N2 fixation estimates with ‘newly’ established techniques need to be conducted in the northern Indian Ocean.

Oceans are a significant part of the atmospheric carbon dioxide (CO2) sink, but their efficiency to sequester CO2 is constrained by the availability of reactive nitrogen, a major limiting nutrient in most of the surface ocean. Because the export flux is difficult to measure directly, new production estimates are useful as a measure of annual carbon export from the sunlit ocean layer. We have analysed data on new, regenerated and primary production based on the 15N tracer incubation experiments from a series of research cruises that were conducted during 1994-2007 in the northern Indian Ocean with an aim to identify environmental variables which control ocean productivity. There are a number of hypotheses concerning the environmental controls on productivity, most of which have not been assessed against direct measurements. Using step-wise multi linear regression (MLR) analysis, we found significant correlation between primary production and sea surface temperature (SST), phosphate (PO43-) and Silicate (Si). Sea surface salinity (SSS), nitrate (NO3-), N:Si and solar radiation are identified as the predictors explaining the most variance in the observed f ratio (ratio of new production to total production). The observed spatial variations in new production could neither be significantly explained by linear regression nor MLR, however, using primary production and f ratio, we have significantly modelled new production on a basin scale. Our findings suggest that the Bay of Bengal could be as important as the Arabian Sea in its efficiency to export carbon to the deep ocean.

Document Type: Article
Additional Information: WOS:000350540400010
Keywords: Multi linear regression; N2 fixation; New production; Northern Indian Ocean; Primary production; 15N tracer
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R07
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.pocean.2014.12.006
ISSN: 0079-6611
Projects: Future Ocean
Date Deposited: 16 Dec 2014 10:17
Last Modified: 13 Apr 2017 09:24
URI: http://oceanrep.geomar.de/id/eprint/26530

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