Izvestiya, Atmospheric and Oceanic Physics

, Volume 43, Issue 3, pp 378–383 | Cite as

Model estimates for the mean gas exchange between the ocean and the atmosphere under the conditions of the present-day climate and its changes expected in the 21st century

  • R. S. Bortkovskii
  • B. N. Egorov
  • V. M. Kattsov
  • T. V. Pavlova


Annual mean fluxes of CO2 and oxygen across the sea surface are estimated with the use of numerical modeling for several regions located in the Gulf Stream and Kuroshio zones. The present-day climatic conditions and the climatic conditions expected in the middle and at the end of the 21st century are considered. Specific features of gas exchange under a strong wind that are associated with gas exchange by bubbles and with changes in the air-water difference of the gas concentrations were taken into account in the calculations. The estimates obtained differ substantially from the results based on the traditional approach, which disregards the above features. A considerable increase in the absorption of CO2 by the ocean, which is mainly caused by the continuing increase in the CO2 concentration in the air during its small changes in the ocean, is expected in the 21st century. At the same time, no trends are revealed in the annual mean fluxes of oxygen across the ocean surface. The conclusion is made that, in calculations of CO2 absorption by the world ocean, it is necessary to take into account both specific features of gas transfer under a strong wind and an increase in the atmospheric concentration of CO2.


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  1. 1.
    W. A. Oost, W. Kohsiek, G. de Leeuw, et al., “On the Discrepancies between CO2 Flux Measurement Methods,” in Proceedings of 3rd International Symposium on Air-Water Gas Transfer, Ed. by B. Jaehne and E. C. Monahan (AEON, Heidelberg, 1995), pp. 723–733.Google Scholar
  2. 2.
    R. Wanninkhof, “Relationships between Wind Speed and Gas Exchange over the Ocean,” J. Geophys. Res. C 97, 7373–7382 (1992).Google Scholar
  3. 3.
    R. S. Bortkovskii, “Estimation of the Oxygen and CO2 Mean Exchange between the Ocean and the Atmosphere in Key Areas of the Ocean,” Izv. Akad. Nauk, Fiz. Atmos. Okeana 42, 250–257 (2006) [Izv., Atmos. Ocean. Phys. 42, 228–235 (2006)].Google Scholar
  4. 4.
    R. S. Bortkovskii, “Gas Transfer across the Ocean Surface and under a Strong Wind and Its Contribution to the Mean Gas Exchange,” Izv. Akad. Nauk, Fiz. Atmos. Okeana 39, 809–816 (2003)) [Izv., Atmos. Ocean. Phys. 39, 732–738 (2003)].Google Scholar
  5. 5.
    T. Takahashi, R. A. Feely, R. Weiss, et al., “Global Air-Sea Flux of CO2: An Estimate Based on Measurements of Sea-Air pCO2 Difference,” Proc. Natl. Acad. Sci. USA 94, 8292–8299 (1997).CrossRefGoogle Scholar
  6. 6.
    I. F. Leifer, W. A. Asher, and P. J. Farley, “A Validation Study of Bubble Mediated Air-Sea Gas Transfer Modeling for Trace Gases,” in Proceedings of 3rd International Symposium on Air-Water Gas Transfer, Ed. by B. Jaehne and E. C. Monahan (AEON, Heidelberg, 1995), pp. 269–283.Google Scholar
  7. 7.
    L. Memery and L. Merlivat, “Modelling of Gas Flux through Bubbles at the Air-Water Interface,” Tellus B 37, 272–285 (1985).CrossRefGoogle Scholar
  8. 8.
    S. A. Thorpe, “On the Clouds of Bubbles Formed by Breaking Wind-Waves in Deep Water and Their Role in Air-Sea Gas Transfer,” Philos. Trans. R. Soc. London, No. (1483), 155–251 (1982).Google Scholar
  9. 9.
    D. K. Woolf and S. A. Thorpe, “Bubbles and the Air-Sea Exchange of Gases in Near-Saturation Conditions,” J. Marine Res. 49, 435–466 (1991).CrossRefGoogle Scholar
  10. 10.
    B. A. Kagan, V. A. Ryabchenko, and A. S. Safrai, Response of the Ocean-Atmosphere System to an External Forcing (Gidrometeoizdat, Leningrad, 1990) [in Russian].Google Scholar
  11. 11.
    S. J. D. D’Allessio, K. Abdella, and N. A. McFarlane, “A New Second-Order Turbulence Closure Scheme for Modeling the Ocean Mixed Layer,” J. Phys. Oceanogr. 28, 1624–1641 (1998).CrossRefGoogle Scholar
  12. 12.
    S. Levitus and T. P. Boyer, World Ocean Atlas (Washington, DC, 1994), Vols. 1, 2.Google Scholar
  13. 13.
    L. A. Strokina, Heat Balance of the Ocean Surface (Gidrometeoizdat, Leningrad, 1989) [in Russian].Google Scholar
  14. 14.
    T. A. Parmuzina, “Reducing the Mean Continuous Duration of Storms Calculated from Three-Hourly Observations to Hourly Data,” Tr. VNIIGMI-MTsD, No. 62, 103–110 (1978).Google Scholar
  15. 15.
    R. S. Bortkovski, “Atmosphere-Ocean Gas Exchange Due to Bubbles Generated by Wind Wave Breaking,” in Gas Transfer at Water Surfaces, Ed. by M. A. Donelan et al., Geophys. Monograph 127, 261–264 (2002).Google Scholar
  16. 16.
    R. S. Bortkovskii and B. N. Egorov, “Consideration for the Statistical Structure of the Wind Velocity during Determination of the Energy and Gas Exchange between the Ocean and the Atmosphere,” Meteorol. Gidrol., No. 2, 46–53 (2003).Google Scholar
  17. 17.
    A. Olsen, A. M. Abdirahman, A. C. Stuart-Menteth, et al., “Diurnal Variations of Surface Ocean pCO2 and Sea-Air CO2 Flux Evaluated Using Remotely Sensed Data,” Geophys. Rev. Lett. 31, L20304, doi:10.1029/2004G1020583 (2004).CrossRefGoogle Scholar
  18. 18.
    N. Nakićenović, J. Alcamo, G. Davis, et al., IPCC Special Report on Emission Scenarios (Cambridge Univ. Press, Cambridge, 2000).Google Scholar
  19. 19.
    IPCC: Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change, Ed. by J. T. Houghton, Y. Ding, D. J. Griggs, et al. (Cambridge Univ. Press, Cambridge, 2001).Google Scholar
  20. 20.
    T.-H. Peng, R. Wanninkhof, J. L. Bullister, et al., “Quantification of Decadal Antropogenic CO2 Uptake in the Ocean Based on Dissolved Inorganic Carbon Measurements,” Nature 396(6711), 560–563 (1998).CrossRefGoogle Scholar
  21. 21.
    P. G. Brewer, C. Goyet, and G. Friedrich, “Direct Observation of the Oceanic CO2 Increase Revisited,” Proc. Natl. Acad. Sci. USA 94, 8308–8313 (1997).CrossRefGoogle Scholar
  22. 22.
    U. Siegenthaler, “Uptake of Excess CO2 by an Outcrop-Diffusion Model of the Ocean,” J. Geophys. Res. C 88, 3599–3608 (1983).Google Scholar
  23. 23.
    M. Hoppema, “Weddell Sea Turned from Source to Sink for Atmospheric CO2 between Pre-Industrial Time and Present,” Global Planet. Changes 40, 219–231 (2004).CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • R. S. Bortkovskii
    • 1
  • B. N. Egorov
    • 1
  • V. M. Kattsov
    • 1
  • T. V. Pavlova
    • 1
  1. 1.Voeikov Main Geophysical ObservatorySt. PetersburgRussia

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