• Login
    View Item 
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Oceanic pCO2 in the Indian sector of the southern Ocean during the austral summer-winter transition phase

    Thumbnail
    View/Open
    Deep_Sea_Res_Pt_II_118_250.pdf (4.787Mb)
    Date
    2015
    Author
    Shetye, S.S.
    Mohan, R.
    Patil, S.
    Jena, B.
    Chacko, R.
    George, J.V.
    Noronha, S.
    Singh, N.
    Priya, L.
    Sudhakar, M.
    Metadata
    Show full item record
    Abstract
    Biogeochemical 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
    URI
    http://drs.nio.org/drs/handle/2264/4877
    Collections
    • Scholarly literature [9074]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV