11/2011, B773 severe turbulence event, Bay of Bengal - Skybrary
Low Dinitrogen Fixation Rates in the Bay of Bengal during ...Summary •First N 2 fixation study...
Transcript of Low Dinitrogen Fixation Rates in the Bay of Bengal during ...Summary •First N 2 fixation study...
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Low Dinitrogen Fixation Rates in the Bay of Bengal during Summer Monsoon
Arvind Singh, Himanshu Saxena, Deepika Sahoo, Atif Khan, Sanjeev Kumar, A K Sudheer
Physical Research Laboratory, Ahmedabad, India
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400 Tg N a-1
N2 loss
135 Tg N a-1
N2 fixation
Data source: Codispoti, 2007
Motivation - Nitrogen Imbalance
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Sampling Locations (July 2018)
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Physical Properties
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Chemical Properties
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Volumetric Rates
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Integrated Rates
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Summary• First N2 fixation study within the sunlit layer of the Bay of Bengal.
• Bay encounters warm water, excess PO43- and Fe - prerequisites for
diazotrophs, thus we hypothesized high N2 fixation in the Bay.
• Our findings were contrary to our hypothesis.
• Contribution of N2 fixation to primary production was negligible.
• Turbidity due to copious riverine discharge and cloud cover over Bay
might have contributed towards the low rates of N2 fixation.
• A detailed study (covering all seasons) is needed to estimate the N2
fixation rates in the Bay.