Theoretical and Applied Climatology

, Volume 104, Issue 1–2, pp 139–158 | Cite as

Simulated changes in the atmospheric water balance over South Asia in the eight IPCC AR4 coupled climate models

Original Paper

Abstract

This paper evaluates the performance of eight state-of-art IPCC-AR4 coupled atmosphere-ocean general circulation models in their representation of regional characteristics of atmospheric water balance over South Asia. The results presented here are the regional climate change scenarios of atmospheric water balance components, precipitation, moisture convergence and evaporation (P, C and E) up to the end of the twenty-second century based on IPCC AR4 modelling experiments conducted for (A1B) future greenhouse gas emission scenario. The AOGCMs, despite their relatively coarse resolution, have shown a reasonable skill in depicting the hydrological cycle over the South Asian region. However, considerable biases do exist with reference to the observed atmospheric water balance and also inter-model differences. The monsoon rainfall and atmospheric water balance changes under A1B scenario are discussed in detail. Spatial patterns of rainfall change projections indicate maximum increase over northwest India in most of the models, but changes in the atmospheric water balance are generally widespread over South Asia. While the scenarios presented in this study are indicative of the expected range of rainfall and water balance changes, it must be noted that the quantitative estimates still have large uncertainties associated with them.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Hydrospheric Atmospheric Research Center (HyARC)Nagoya UniversityNagoyaJapan
  2. 2.International Pacific Research Center, SOESTUniversity of Hawaii at ManoaHonoluluHawaii

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