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A study of the carbon dioxide system in the northern Indian Ocean during premonsoon

DRS at CSIR-National Institute of Oceanography

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Title A study of the carbon dioxide system in the northern Indian Ocean during premonsoon
 
Creator George, M.D.
DileepKumar, M.
Naqvi, S.W.A.
Banerjee, S.
Narvekar, P.V.
DeSousa, S.N.
Jayakumar, D.A.
 
Subject Chemistry and Biogeochemistry
carbon dioxide
monsoons
degradation
particulate organic carbon
ISW, Indian Ocean
 
Description Extensive data sets on the carbon dioxide system in the northern Indian Ocean have been obtained during the premonsoon season. A marked increase (~50 ~kM) in the total carbon dioxide (TCO@d2@@) content is observedin deep (~. 1 km) waters of the northern Arabian Sea between approximately 10 and 20~'N; contributions from soft tissue decomposition and skeletal solution to the observed increase are about the same. In the Bay of Bengal, the corresponding increase in TCO@d2@@ observed from 11 to 19~'N is relatively small (17.5 ~kM). Significantly,, the contribution of the organic decomposition in this region is only 1/7 of the increase in TCO@d2@@. This, together with the earlier reports on large sinking fluxes of particulate organic carbon and pronounced near-bottom anomalies, suggests rapid sinking of organic matter with little decomposition in the water column due to the immense fluvial inputs of lithogenic matter into the Bay of Bengal. The greater extent of organic decomposition in subsurface waters of the Arabian Sea is reflected by generally lower pH and higher @p@@CO@d2@@ levels. This also causes the deep waters in the Arabian Sea to be more corrosive to CaCO@d3@@ than those in the Bay of Bengal. However, the TCO@d2@@ concentrations in the deep Bay of Bengal are slightly higher as compared to those in the Arabian Sea, presumably due to the greater CaCO@d3@@ dissolution in deep waters en route the Bay of Bengal (0.33 mmol/m@u2@@/d) during the premonsoon season. The overall annual evasion rate of CO@d2@@ from the Arabian Sea and Bay of Bengal has been estimated as ~. 50 Tg C. These results confirm that the northern Indian Ocean serves as a significant source of atmospheric CO@d2@@
 
Date 1994-12-23T10:06:28Z
2017-09-30T01:56:29Z
1994-12-23T10:06:28Z
2017-09-30T01:56:29Z
1994
 
Type Journal Article
 
Identifier Marine Chemistry, vol.47(3-4); 1994; 243-254
0304-4203
http://drs.nio.org/drs/handle/2264/7459
 
Language en
 
Relation Mar Chem
SCI
 
Publisher Elsevier