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Future change of diabatic heating in the Asian summer monsoon

PI: Hiroaki Ueda
Institution: University of Tsukuba
Diabatic heating, mainly consists of latent heating and sensible heat supply from the land surface, has an important role in the establishment and maintenance of the monsoon. Until now, there are many studies on the heating processes related to the seasonal evolution of the Asian summer monsoon. Ueda et al. (2003, J. Climate) has revealed that pre-monsoon heating in the western part of the Tibetan Plateau exhibits hybrid nature of <wetc and <dryc processes. Ishizaki and Ueda (2004) analyzed the heat and moisture budget over the Indochina Peninsula and obtained presence of condensation heating as well as the sensible heat supply from the land surface. Recently, Ueda and Kawamura (2004, Int. J. Climatol.) has indicated that the springtime anomalous tropical heat source over the Indian Ocean, relevant to a cold episode of the El Nino, can affect midlatitude atmosphere through direct heat-induced response to the atmosphere and cause to change ensuing Asian summer monsoon. However, few studies are available on longer time-scale. Thus, the purpose of the proposed research is to evaluate the change of heat and moisture budget, especially over the Asiatic landmass in boreal summer. The main data to be used is monthly mean 3-D atmosphere data (air temperature, horizontal wind, specific humidity, omega, geopotential height). Additional data required for the heat and moisture budget analysis are monthly net down/up-ward short/long- wave radiation flux and precipitation.
  • Hori, M. E., and H. Ueda, 2006: Impact of Global Warming on the East Asian Winter Monsoon as revealed by nine Coupled Atmosphere-Ocean GCMs. Geophys. Res. Lett., 33, doi:10.1029/2005GL024961. Abstract. Edit.
  • Ueda, H., A. Iwai, K. Kuwako and M.E. Hori, 2006: Impact of anthropogenic forcing on the Asian summer monsoon as simulated by 8 GCMs.. Geophys. Res. Lett., 33, doi:10.1029/2005GL025336. Abstract. Edit.

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