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A reduction in marine primary productivity driven by rapid warming over the tropical Indian Ocean

Roxy, MK and Modi, A and Murtugudde, R and Valsala, V and Panickal, S and Prasanna Kumar, S and Ravichandran, M and Vichi, M and Lavy, M (2016) A reduction in marine primary productivity driven by rapid warming over the tropical Indian Ocean. Geophysical Research Letters, 43 (2). pp. 826-833.

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Among the tropical oceans, the western Indian Ocean hosts one of the largest concentrations of marine phytoplankton blooms in summer. Interestingly, this is also the region with the largest warming trend in sea surface temperatures in the tropics during the past century - although the contribution of such a large warming to productivity changes has remained ambiguous. Earlier studies had described the western Indian Ocean as a region with the largest increase in phytoplankton during the recent decades. On the contrary, the current study points out an alarming decrease of up to 20 in phytoplankton in this region over the past six decades. We find that these trends in chlorophyll are driven by enhanced ocean stratification due to rapid warming in the Indian Ocean, which suppresses nutrient mixing from subsurface layers. Future climate projections suggest that the Indian Ocean will continue to warm, driving this productive region into an ecological desert.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Atmospheric temperature; Chlorophyll; Climate change; Marine biology; Phytoplankton; Surface waters; Tropics, Arabian sea; Climate projection; Indian ocean; Marine phytoplankton; Ocean stratification, Oceanography
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 26 Apr 2016 06:19
Last Modified: 26 Apr 2016 06:19

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