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The nitrogen cycle in the Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title The nitrogen cycle in the Arabian Sea
 
Creator Bange, H.W.
Naqvi, S.W.A.
Codispoti, L.A.
 
Subject nitrogen cycle
denitrification
nitrogen fixation
nitrous oxide
anthropogenic factors
water column
man-induced effects
climatic change
 
Description Despite their importance for the global oceanic nitrogen (N) cycle, estimates of N fluxes in the Arabian Sea remain in considerable uncertainty. In this report, we summarize current knowledge of important processes, including denitrification, N sub(2) fixation and nitrous oxide emissions. Additionally, we discuss anthropogenic impacts on the N cycle in the region. Existing studies suggest that the Arabian Sea is a significant source of N sub(2)O, and a major sink for fixed-N mainly due to enhanced rates of denitrification that occur in suboxic portions of the water column in the Arabian Sea. Sedimentary denitrification is small compared to water column denitrification, and additions of fixed-N via N sub(2) fixation also are small compared to pelagic denitrification. As a consequence, the fixed-N budget of the Arabian Sea is dominated by an advective supply from the south, and by the sink arising from pelagic denitrification. Although relatively small compared to the advective supply, inputs of fixed-N from runoff and from the atmosphere may have significant impacts on surface waters and on the coastal waters of western India, and these inputs are rising because of human activities. Overall, the Arabian Sea 's nitrogen cycle is likely to respond sensitively to climate change and, in turn, have an impact on climate via its N sub(2) O and denitrification components.
 
Date 2008-02-22T04:47:45Z
2008-02-22T04:47:45Z
2005
 
Type Journal Article
 
Identifier Progress in oceanography, Vol.65; 145-158p.
http://drs.nio.org/drs/handle/2264/898
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Elsevier