Current Science

Satya Prakash ¹, R. Ramesh ¹, M. S. Sheshshayee ², Rahul Mohan ³, M. Sudhakar ³

Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Department of Crop Physiology, University of Agricultural Sciences, Bengaluru 560 065, IN
3 National Centre for Antarctic and Ocean Research, Vasco-da-Gama, Goa 403 804, IN

Abstract

We report data on nitrate, ammonium and urea uptake rates from the Equatorial and Southern Indian Oceans. Productivity (0.81-2.23 mmol Nm^-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 (69°S) and lower over most of the Southern Ocean, the lowest being at 58°S. 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.

Keywords

Carbon Sequestration, f-Ratio, Nitrogenuptake, Primary Productivity, Southern Ocean.

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K. Chandrasekar ¹, N. Saravanane ¹, Sherine Sonia Cubelio ¹, M. Sudhakar ¹

Affiliations
1 Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Government of India, Atal Bhavan, LNG Road, Ochanthuruthu (PO), Puthuvype, Kochi 682 508, IN

Abstract

No Abstract.

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