Enhanced Cold-Season Warming in Arid and Semi-Arid Regions of China

  • RAN Jinjiang ,
  • JI Mingxia ,
  • HUANG Jianping ,
  • GUAN Xiaodan ,
  • QI Yulei ,
  • HE Yongli
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  • College of Atmospheric Sciences, Lanzhou University, Key Laboratory of Semi-Arid Climate Change, Ministry of Education, Lanzhou 730000, China;2. Sichuan Meteorological Training Center, Chengdu 610072, China

Received date: 2013-01-28

  Online published: 2014-08-28

Abstract

Using 55-year monthly homogenization surface air temperature at 713 stations from the National Climate Center of China, the seasonal and regional characteristics of warming in China have been investigated. In particular, the atmospheric circulation before and after cold-season warming over arid and semi-arid region have been analyzed. The interannual variation shows that warming began in the mid 1980s, and increased fast in the 1990s, then gradually slowed down in the early 21st century. The annual average warming trend in semi-arid and arid areas is 1.7 times that in humid and semi-humid areas. As for seasonal characteristics, the warming trend during cold-season is 1.9 times that of warm-season. The warming trend is comparatively fast in arid and semi-arid areas with more than 0.3℃·(10a)-1 and particularly notable over the Qinghai-Xizang Plateau, middle inner Mongolia, northeast and north China. However, the warming trend in humid and semi-humid areas is relatively slow, in which the central and west regions is slower than east coast. The cold season temperature in arid and semi-arid areas experienced a significantly abrupt change from cold to warm in 1986. A composite analysis is used here to investigate the response of the atmospheric circulation. The weakening of arctic polar vortex, eastern Asia trough, shallow trough in Europe and Siberian High, and anomaly cyclonic circulation as well as abnormal southeast wind in eastern China all could induce the warming in semi-arid and arid areas.

Cite this article

RAN Jinjiang , JI Mingxia , HUANG Jianping , GUAN Xiaodan , QI Yulei , HE Yongli . Enhanced Cold-Season Warming in Arid and Semi-Arid Regions of China[J]. Plateau Meteorology, 2014 , 33(4) : 947 -956 . DOI: 10.7522/j.issn.1000-0534.2013.00065

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