Letter | Published:

Dominant control of the South Asian monsoon by orographic insulation versus plateau heating

Nature volume 463, pages 218222 (14 January 2010) | Download Citation

Abstract

The Tibetan plateau, like any landmass, emits energy into the atmosphere in the form of dry heat and water vapour, but its mean surface elevation is more than 5 km above sea level. This elevation is widely held to cause the plateau to serve as a heat source that drives the South Asian summer monsoon, potentially coupling uplift of the plateau to climate changes on geologic timescales1,2,3,4,5. Observations of the present climate, however, do not clearly establish the Tibetan plateau as the dominant thermal forcing in the region: peak upper-tropospheric temperatures during boreal summer are located over continental India, south of the plateau. Here we show that, although Tibetan plateau heating locally enhances rainfall along its southern edge in an atmospheric model, the large-scale South Asian summer monsoon circulation is otherwise unaffected by removal of the plateau, provided that the narrow orography of the Himalayas and adjacent mountain ranges is preserved. Additional observational and model results suggest that these mountains produce a strong monsoon by insulating warm, moist air over continental India from the cold and dry extratropics. These results call for both a reinterpretation of how South Asian climate may have responded to orographic uplift, and a re-evaluation of how this climate may respond to modified land surface and radiative forcings in coming decades.

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References

  1. 1.

    Hochgebirge und allgemeine Zirkulation. II. Die Gebirge als Wärmequellen. Arch. Meteorol. Geophys. Bioklimatol. A 5, 265–279 (1953)

  2. 2.

    Contributions to a Meteorology of the Tibetan Highlands (Tech. Rep. 130, Colorado State Univ., 1968)

  3. 3.

    & The role of mountains in the South Asian monsoon circulation. J. Atmos. Sci. 32, 1515–1541 (1975)

  4. 4.

    , & Mantle dynamics, uplift of the Tibetan Plateau, and the Indian monsoon. Rev. Geophys. 31, 357–396 (1993)

  5. 5.

    China: The third pole. Nature 454, 393–396 (2008)

  6. 6.

    & The onset and interannual variability of the Asian summer monsoon in relation to land-sea thermal contrast. J. Clim. 9, 358–375 (1996)

  7. 7.

    & Forcing of late Cenozoic Northern Hemisphere climate by plateau uplift in southern Asia and the American West. J. Geophys. Res. 94, 18409–18427 (1989)

  8. 8.

    & Sensitivity of the Indian monsoon to forcing parameters and implications for its evolution. Nature 360, 647–652 (1992)

  9. 9.

    , & Role of Asian and African orography in Indian summer monsoon. Geophys. Res. Lett. 29, 50–51 (2002)

  10. 10.

    , & Evolution of the Asian summer monsoon associated with mountain uplift: simulation with the MRI atmosphere-ocean coupled GCM. J. Meteorol. Soc. Jpn 81, 909–933 (2003)

  11. 11.

    , & Relative roles of large-scale orography and land surface processes in the global hydroclimate. Part I: impacts on monsoon systems and the tropics. J. Hydrometeorol. 7, 626–641 (2006)

  12. 12.

    & Tectonic forcing of late Cenozoic climate. Nature 359, 117–122 (1992)

  13. 13.

    , , & Evolution of Asian monsoons and phased uplift of the Himalaya-Tibetan plateau since Late Miocene times. Nature 411, 62–66 (2001)

  14. 14.

    & in The Asian Monsoon (ed. Wang, B.) 513–549 (Springer, 2006)

  15. 15.

    Tropical sea surface temperature: an interactive one-dimensional atmosphere-ocean model. Dyn. Atmos. Oceans 2, 455–469 (1978)

  16. 16.

    , & On large-scale circulations in convecting atmospheres. Q. J. R. Meteorol. Soc. 120, 1111–1143 (1994)

  17. 17.

    , & Ocean-atmosphere-land feedbacks in an idealized monsoon. Q. J. R. Meteorol. Soc. 127, 1869–1892 (2001)

  18. 18.

    , & Theoretical aspects of the onset of Indian summer monsoon from perturbed orography simulations in a GCM. Ann. Geophys. 24, 2075–2089 (2006)

  19. 19.

    & The convective cold top and quasi equilibrium. J. Atmos. Sci. 64, 1467–1487 (2007)

  20. 20.

    et al. Subseasonal variability associated with Asian summer monsoon simulated by 14 IPCC AR4 coupled GCMs. J. Clim. 21, 4541–4567 (2008)

  21. 21.

    & Annual intensification of the Somali jet in a quasi-equilibrium framework: observational composites. Q. J. R. Meteorol. Soc. 135, 319–335 (2009)

  22. 22.

    & Temperature profiles in radiative-convective equilibrium above surfaces at different heights. J. Geophys. Res. 104, 24265–24272 (1999)

  23. 23.

    , , , & Role of narrow mountains in large-scale organization of Asian monsoon convection. J. Clim. 19, 3420–3429 (2006)

  24. 24.

    & Associations between China monsoon rainfall and tropospheric jets. Q. J. R. Meteorol. Soc. 124, 2597–2623 (1998)

  25. 25.

    Orographic influence of the Tibetan Plateau on the Asiatic winter monsoon circulation. Part I: large-scale aspects. J. Meteorol. Soc. Jpn 59, 66–84 (1981)

  26. 26.

    , & A diagnostic study of formation and structures of the Meiyu front system over East Asia. J. Meteorol. Soc. Jpn 82, 1565–1576 (2004)

  27. 27.

    , & Northern winter stationary waves: theory and modeling. J. Clim. 15, 2125–2144 (2002)

  28. 28.

    et al. The ERA-40 re-analysis. Q. J. R. Meteorol. Soc. 131, 2961–3012 (2005)

  29. 29.

    , & Overview of the Integrated Global Radiosonde Archive. J. Clim. 19, 53–68 (2006)

  30. 30.

    Atmospheric Convection (Oxford Univ. Press, 1994)

  31. 31.

    et al. The formulation and atmospheric simulation of the Community Atmosphere Model: CAM3. J. Clim. 19, 2144–2161 (2006)

  32. 32.

    et al. The TRMM Multisatellite Precipitation Analysis (TMPA): quasi-global, multiyear, combined-sensor precipitation estimates at fine scales. J. Hydrometeorol. 8, 38–55 (2007)

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Acknowledgements

We thank P. Molnar for conversations motivating this work. Computing time was provided by the NCAR, which is sponsored by the NSF. W.R.B. was supported by the Reginald A. Daly Postdoctoral Fellowship in the Department of Earth and Planetary Sciences at Harvard University, and the John and Elaine French Environmental Fellowship at the Harvard University Center for the Environment. Z.K. was supported by NSF grant ATM-0754332.

Author Contributions Both authors contributed to designing the research and interpreting results. W.R.B. performed the observational analyses and model runs, and wrote the manuscript.

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Affiliations

  1. Department of Earth and Planetary Sciences,

    • William R. Boos
    •  & Zhiming Kuang
  2. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA

    • Zhiming Kuang

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Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to William R. Boos.

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https://doi.org/10.1038/nature08707

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