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Nitrogen uptake rates and f-ratios in the Equatorial and Southern Indian Ocean

Prakash, S and Ramesh, R and Sheshshayee, MS and Mohan, R and Sudhakar, M (2015) Nitrogen uptake rates and f-ratios in the Equatorial and Southern Indian Ocean. Current Sciences, 108 (2). pp. 239-245.

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We report data on nitrate, ammonium and urea uptake rates from the Equatorial and Southern Indian Oceans. Productivity (0.81–2.23 mmol N m–2 d–1) over the Equatorial Indian Ocean was low, but the f-ratio (0.13–0.45) was relatively high. In the Southern Indian Ocean total N-uptake rate varied from 1.7 to 12.3 mmol Nm–2 d–1; it was higher in the Antarctic coast (69S) and lower over most of the Southern Ocean, the lowest being at 58S. The f-ratio also showed significant spatial variation, but was higher compared to values at the Equatorial Indian Ocean. The mean f-ratio in the Southern Indian Ocean was 0.50. The nitrate-specific uptake rates and f-ratios appear to have increased significantly in the recent past relative to earlier estimates. While productivity in the Southern Ocean is comparable to that in the Equatorial Indian Ocean, higher f-ratios in the former underscore its importance in the uptake of CO2

Item Type: Article
Additional Information: Copyright of this article belongs Indian Academy of Sciences
Uncontrolled Keywords: Carbon sequestration;f-ratio;nitrogen uptake; primary productivity;Southern Ocean
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 04 Feb 2015 06:20
Last Modified: 04 Feb 2015 06:20

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