Impacts of coastal SST variability on the East Asian summer monsoon

Advances in Atmospheric Sciences volume 24, pages 259–270 (2007)Cite this article

Abstract

The impacts of the seasonal and interannual SST variability in the East Asia coastal regions (EACRSST) on the East Asian summer monsoon (EASM) have been examined using a regional climate model (PσRCM9) in this paper. The simulation results show that the correlation between the EACRSST and the EASM is strengthened after the mid-1970s and also the variability of the EACRSST forcing becomes much more important to the EASM interannual variability after the mid-1970s. The impacts of the EACRSST on the summer precipitation over each sub-region in the EASM region become weak gradually from south to north, and the temporal evolution features of the summer precipitation differences over North and Northeast China agree well with those of the index of EASM (IEASM) differences.

The mechanism analyses show that different EACRSST forcings result in the differences of sensible and latent heat flux exchanges at the air-sea interface, which alter the heating rate of the atmosphere. The heating rate differences induce low level air temperature differences over East Asia, resulting in the differences of the land-sea thermal contrast (LSTC) which lead to 850 hPa geopotential height changes. When the 850 hPa geopotential height increases over the East Asian continent and decreases over the coast of East China and the adjacent oceans during the weakening period of weakens consequently. On the contrary, the EASM enhances during the strengthening period of the LSTC.

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  1. Department of Atmospheric Sciences, Nanjing University, Nanjing, 210093, China

    Huang Anning, Zhang Yaocun & Gao Xinfang

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  1. Huang Anning
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  2. Zhang Yaocun
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  3. Gao Xinfang
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Huang, A., Zhang, Y. & Gao, X. Impacts of coastal SST variability on the East Asian summer monsoon. Adv. Atmos. Sci. 24, 259–270 (2007). https://doi.org/10.1007/s00376-007-0259-7

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Key words

  • SST variability
  • coastal oceans
  • East Asian monsoon
  • numerical simulations