Climate Dynamics

, Volume 36, Issue 7, pp 1463–1473

Recent changes in the summer precipitation pattern in East China and the background circulation


DOI: 10.1007/s00382-010-0852-9

Cite this article as:
Zhu, Y., Wang, H., Zhou, W. et al. Clim Dyn (2011) 36: 1463. doi:10.1007/s00382-010-0852-9


This study documents the decadal changes of the summer precipitation in East China, with increased rainfall in the Huang-Huai River region (HR) and decreased in the Yangtze River region (YR) during 2000–2008 in comparison to 1979–1999. The main features of the atmospheric circulation related to the increased precipitation in the HR are the strengthened ascending motion and slightly increased air humidity, which is partly due to the weakened moisture transport out of the HR to the western tropical Pacific (associated with the weakened westerly over East Asia and the warming center over the Lake Baikal). The rainfall decrease in the YR is related to the weakened ascending motion and reduced water vapor content, which is mainly related to the weakened southwesterly moisture flux into the YR (associated with the eastward recession of the Western Pacific Subtropical High). The global sea surface temperature (SST) also shows significant changes during 2000–2008 relative to 1979–1999. The shift of the Pacific decadal oscillation (PDO) to a negative phase probably induces the warming over the Lake Baikal and the weakened westerly jet through the air-sea interaction in the Pacific, and thus changes the summer precipitation pattern in East China. Numerical experiments using an atmospheric general circulation model, with prescribed all-Pacific SST anomalies of 2000–2008 relative to 1979–1999, also lend support to the PDO’s contribution to the warming over the Lake Baikal and the weakened westerlies over East China.


East ChinaPrecipitationInterdecadal variabilityClimate change

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Nansen-Zhu International Research Centre, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Climate Change Research CenterChinese Academy of SciencesBeijingChina
  3. 3.School of Energy and EnvironmentCity University of Hong KongHong KongChina
  4. 4.Graduate School of Chinese Academy of SciencesBeijingChina