Contrasting Productivity and Redox Potential in Arabian Sea and Bay of Bengal

Suhas S Shetye; Maruthadu Sudhakar; Rahul Mohan; Babula Jena

doi:10.1007/s12583-014-0415-9

Volume 25 Issue 2

Apr 2014

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Journal of Earth Science > 2014 > 25(2): 366-370.

Suhas S Shetye, Maruthadu Sudhakar, Rahul Mohan, Babula Jena. Contrasting Productivity and Redox Potential in Arabian Sea and Bay of Bengal. Journal of Earth Science, 2014, 25(2): 366-370. doi: 10.1007/s12583-014-0415-9

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Suhas S Shetye, Maruthadu Sudhakar, Rahul Mohan, Babula Jena. Contrasting Productivity and Redox Potential in Arabian Sea and Bay of Bengal. Journal of Earth Science, 2014, 25(2): 366-370. doi: 10.1007/s12583-014-0415-9

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Contrasting Productivity and Redox Potential in Arabian Sea and Bay of Bengal

doi: 10.1007/s12583-014-0415-9

1.
National Centre for Antarctic & Ocean Research, Headland Sada, Goa, 403804, India
2.
Ministry of Earth Sciences, Prithvi Bhavan, New Delhi, 11 003, India

More Information

Corresponding author: Suhas S. Shetye, suhassht@gmail.com
Received Date: 21 Sep 2013
Accepted Date: 17 Feb 2014
Publish Date: 01 Apr 2014

Abstract

Abstract

Understanding the past and present changes is critical for evaluating the future climatic changes. In order to understand the paleoproductivity and depositional environments of Northern Indian Ocean,two sediment cores were collected,one each from the Arabian Sea (lat. 16°51.40′N and long. 71°54.37′E,water depth 803 m) and the Bay of Bengal (lat. 13°05.35′N and long. 91°28.21′E,water depth 3 054 m). The surface seawater samples indicate higher pCO₂ values in Arabian Sea as compared to the Bay of Bengal. The sediment organic carbon variations along with sedimentological and other geochemical parameters were studied. Sediment organic carbon varied from 0.5%–4.7% and 0.3%–1.22% in Arabian Sea and the Bay of Bengal,respectively. In Arabian Sea,low productivity,oxic conditions and less intense southwest monsoon prevailed during the deglacial period,whereas productivity has increased from last 16 kyr to the modern age. In the Bay of Bengal,organic carbon decreased from the Last Glacial Maxima (LGM) to the modern age,indicating higher productivity in the past as compared to modern age. Fe was associated with organic carbon in the Bay of Bengal and increased during LGM,showing similar trend to that of organic carbon,indicating that Fe may be the limiting factor for the growth of phytoplankton in the Bay of Bengal in the modern age. In the Bay of Bengal,Mn is enriched during modern age and is depleted during LGM,whereas chromium showed the opposite trend indicating anoxic conditions during the LGM,whereas in Arabian Sea the trends are opposite to the Bay of Bengal.
- paleoproductivity,
- geochemical,
- deglacial,
- organic carbon

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Contrasting Productivity and Redox Potential in Arabian Sea and Bay of Bengal

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