The central and eastern Arabian Sea as a perennial source of atmospheric carbon dioxide

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Sarma, V. V. S. S. ; Kumar, M. Dileep ; George, M. D. (2011)

Seasonal (winter monsoon, intermonsoon and southwest monsoon) and interannual (between southwest monsoon seasons of 1995 and 1996) variations in total carbon dioxide (TCO2) and partial pressure of CO2 (pCO2) were studied in the central and eastern Arabian Sea as a part of the JGOFS (India) Programme. The pCO2 values were computed from the results of coulometric TCO2 and spectrophotometric pH measurements. Seasonal variability in TCO2 is evident with the changing circulation and biological production. In all seasons, the pCO2 is higher in surface waters of the Arabian Sea, except along the Indian coast in the southwest monsoon, than that in atmosphere, and thus this region appears to be a perennial source of atmospheric CO2. Significantly, an average of ∼45 Tg y−1 could be ejected to atmosphere from the study region, that seems to far exceed the earlier estimations. The estimated fluxes, however, are in agreement with those from the eastern equatorial Pacific Ocean.DOI: 10.1034/j.1600-0889.1998.t01-1-00005.x
  • References (16)
    16 references, page 1 of 2

    Jayakumar, D. A. 1994. A study of the carbon dioxide system in the northern Indian Ocean during premonsoon. Mar. Chem. 47, 243-254.

    Goyet, C. and Poisson, A. 1989. New determination of carbonic acid constants in seawater as a function of temperature and salinity. Deep-Sea Res. 36A, 1635-1654.

    Hansson, I. 1973. A new set of acidity constants for carbonic acid and boric acid in seawater. Deep-Sea Res. 20, 461-478.

    Kumar, M. D., Rajendran, A., Somasundar, K., Ittekkot, V. and Desai, B. N. 1992. Processes controlling carbon components in the Arabian Sea. In: Oceanography of the Indian Ocean (ed. B. N. Desai). Oxford-IBH, New Delhi, pp. 313-325.

    Kumar, M. D., Naqvi, S. W. A., George, M. D. and Jayakumar, D. A. 1996. A sink for atmospheric carbon dioxide in the northeast Indian Ocean. J. Geophys. Res. 101, 18,121-18,125.

    Liss, P. S. and Merlivat, L. 1986. Air-sea gas exchange rates: Introduction and synthesis. In: T he roˆle of airsea exchange in geochemical cycling (ed. P. BuatMenard). D. Reidel, Norwell, Mass., pp. 113-129.

    Louanchi, F., Metzl, N. and Poisson, A. 1996. Modelling the monthly sea surface fCO2 fields in the Indian Ocean. Mar. Chem. 55, 265-279.

    Madhupratap, M., Prasanna Kumar, S., Bhattathiri, P. M. A., Kumar, M. D., Raghukumar, S., Nair, K. K. C. and Ramaiah, N. 1996. Mechanism of the biological response to winter cooling in the northeastern Arabian Sea. Nature (L ondon) 384, 549-552.

    Muraleedharan, P. M. and Prasanna Kumar, S. 1996. Arabian Sea upwelling - a comparison between coastal and open ocean regions. Curr. Sci. 71, 842-846.

    Sarma, V. V. S. S., Kumar, M. D., George, M. D. and Rajendran, A. 1996. Seasonal variations in inorganic carbon components in the central and eastern Arabian Sea. Curr. Sci. 71, 852-856.

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