Acta Geographica Sinica ›› 2008, Vol. 63 ›› Issue (7): 761-768.doi: 10.11821/xb200807010

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The Climatic Characteristics and Change of Haze Days over China during 1961- 2005

GAO Ge   

  1. Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China
  • Received:2008-03-15 Revised:2008-05-07 Online:2008-07-25 Published:2008-07-25
  • Supported by:

    Project of China Meteorological Administration, No.2007-2012208-2

Abstract:

In the context of haze days during the period 1961-2005 over China, the characteristics and changes of temporal and spatial distribution of haze days as well as possible reason and the relationship with the trend of global solar radiation and sunshine duration are analyzed. Result shows that the spatial pattern of annual and seasonal haze days presents more in eastern and less in western China. There are three regions with the number of haze days coinciding with the economically developed regions: the lower and middle reaches of the Yangtze River, North China and South China. Apart from Northeast China, the Qinghai-Tibet Plateau and western part of Northwest China with small annual variation and less in values, the annual variation of haze days is obvious in most of the other regions. The haze days are maximum in winter and the minimum in summer. In recent 45 years, the national mean annual haze days exhibited obvious increasing trends with the maximum in 2004. In most parts of eastern China, the number of haze days shows increasing trends, particularly in areas such as the middle and lower reaches of the Yangtze River, Pearl River Basin and west of Henan Province with obvious trends and the increments of haze days are great, where the increasing air pollution caused by human activities and climate change are the possible reasons. In western China and Northeast China, the trend is decreasing. In North China, the middle and lower reaches of the Yangtze River and South China, the trends of haze days and sunshine durations are opposite. The increasing haze days may be one of the reasons leading to the decrease of global solar radiations. In Northeast China, Northwest China, Southwest China and Tibet-Qinghai Plateau, the trends of haze days show slight decrease and are identical to the change of sunshine duration. But in these regions the haze seldom occurs and the change of it will not greatly affect the change of sunshine duration and global solar radiation.

Key words: China, haze, atmospheric pollution, sunshine duration, global solar radiation