Show simple item record

dc.contributor.authorShetye, S.S.
dc.contributor.authorMohan, R.
dc.contributor.authorPatil, S.
dc.contributor.authorJena, B.
dc.contributor.authorChacko, R.
dc.contributor.authorGeorge, J.V.
dc.contributor.authorNoronha, S.
dc.contributor.authorSingh, N.
dc.contributor.authorPriya, L.
dc.contributor.authorSudhakar, M.
dc.date.accessioned2016-01-07T03:54:36Z
dc.date.available2016-01-07T03:54:36Z
dc.date.issued2015
dc.identifier.citationDeep Sea Research Part II: Topical Studies in Oceanography, vol.118; 2015; 250-260
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/4877
dc.description.abstractBiogeochemical processes in the Southern Ocean (SO) play a significant role in regulating the global climate. The physical and biological processes controlling pCO<sub>2</sub> in the surface mixed layer at the Indian sector of SO were observed, and changes during the transition period from summer to early winter (January, February and March) were compared. An existing, one-dimensional model describing the mixed-layer carbon cycle was used to determine the relative contributions of biological activity, mixing, thermal and air–sea fluxes on pCO<sub>2</sub>. A breakdown of the controls shows that the pCO<sub>2</sub> distributions are dominated by biological processes during January and February, whereas mixing and thermal effects contributed equally during March. Biological processes accounting for pCO<sub>2</sub> decrease reached a maximum value of 108 µatm during January. Our results are categorized according to distinct hydrographic regions such as oceanic fronts Sub-tropical front (STF), Sub-Antarctic front (SAF), Polar front (PF) and Antarctic zone (AZ). pCO<sub>2</sub> varied among these three studied months, the mean pCO<sub>2</sub> increasing from 286 µatm in January to 337 µatm in March, whereas an opposite trend was observed with dissolved oxygen (O<sub>2</sub>). The satellite-derived Primary Production (PP) decreased from January to March and also from the STF towards the SAF, PF and AZ. The observed differences in PP and pCO<sub>2</sub> during the three months showed the total diatom count ranging from 0.49×10<sup>3</sup> cells/l in March to 3.2×10<sup>3</sup> cells/l in January. Our study indicates that the drawdown in sea-surface pCO<sub>2</sub> from March to January could be attributed to the light availability, shallow Mixed layer depth (MLD), high PP, nutrient availability, and low upwelling velocity. Eddies play an important role in regulating pCO<sub>2</sub> that require further studies to quantify their percentage contribution in pCO<sub>2</sub> rise/drawdown
dc.language.isoen
dc.publisherElsevier
dc.rightsAn edited version of this paper was published by Elsevier. Copyright [2015] Elsevier
dc.subjectAQUATIC COMMUNITIES
dc.subjectAQUATIC ECOLOGY, PRODUCTIVITY
dc.subjectOCEANOGRAPHY AND LIMNOLOGY
dc.subjectCHEMISTRY AND BIOGEOCHEMISTRY
dc.titleOceanic pCO2 in the Indian sector of the southern Ocean during the austral summer-winter transition phase
dc.typeJournal Article


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record