Acta Geographica Sinica ›› 2003, Vol. 58 ›› Issue (7s): 75-82.doi: 10.11821/xb20037s009

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Arid Climate Trend over Northeastern China and Its Response to Global Warming

XIE An1, SUN Yonggang2, BAI Renhai2   

  1. 1. Department of Atmospheric Sciences, Peking University, Beijing 100871, China;
    2. Heilongjiang Meteorological Bureau, Harbin 150030, China
  • Received:2003-04-10 Revised:2003-07-20 Online:2003-12-25 Published:2003-12-25
  • Supported by:

    National Key Project for Basic Sciences, No.G1999043405

Abstract:

The station data, including precipitation, air temperature and soil humidity are employed to investigate the arid climate trend for the past 50 years over northeastern China. "Atmospheric drought index" is proposed based on monthly mean temperature and precipitation anomalies as well as mean variance. The variations in the index and soil humidity show that the arid situation gets deteriorated throughout the northeastern China, this arid trend is more significant since the mid-1990s, especially in semi-arid area located in northeastern Inner Mongolia. Air temperature increase plays a more important role than precipitation decrease does in terms of the formation of drought. Although rainfall has slightly increased over the southern part of northeastern China in recent 50 years, arid trend remains to be developing, which is obviously associated with global warming. The responses of aridity developing over northeastern China to the global warming are explored using linear regression analyses. The results show that under circumstance of global temperature increase by 1oC the aridity extent will rise 5-20%, its maximum will reach 22%.

Key words: northeastern China, soil humidity, atmospheric drought index, arid trend, global warming