Plateau Meteorology

Plateau Meteorology >

2016 , Vol. 35 >Issue 5: 1339 - 1351

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00099

Analysis on Variation Characteristics and Differences of the Climate Drying Degree between South and North of China

  • ZHANG Hongli ,
  • ZHANG Qiang ,
  • LIU Qian ,
  • YAN Pengcheng
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  • College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration, Lanzhou 730020, China;Gansu Provincial Meteorological Bureau, Lanzhou 730020, China;College Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China

Received date: 1999-11-30

  Online published: 2016-10-28

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Abstract

With global warming, droughts have become one of the most serious environmental problems. There are different degrees of drought tendency in some regions of China in recent years. Precipitation and Potential evaporation are selected from the high resolution data of Climatic Research Unit (CRU) to calculate drought index during 1961-2012 in China, and the aridity index is calculated by the ratio of potential evaporation to precipitation to study the aridity difference between north and south China. By separating eastern China into two regions (north and south) and using the linear trend estimation, Morlet wavelet analysis and other methods, variations in droughts and the differences between the dry and wet seasons north and the south of eastern China are analyzed. It shows that: (1) Eastern China is drying during past 112 years, and the trend is more obvious after twentieth Century 60's. The increasing trend of aridity in northern China is faster than that in the south, and the differences between aridity in north and south China expand with time. An increasing aridity is accompanying an increasing temperature, so it can be concluded that the effect of increasing temperature on the potential evaporation intensifies the degree of drought. (2) In addition, sudden turn of drought and flood also increase, which may carry greater challenges for climatic prediction and drying disaster risk. There is a accelerate transformation of 20 years and 2 years in aridity index both over north and south china, and the quasi biennial phenomenon also accelerate after twentieth Century 60 years, but the transition process always is mild in south. (3) There are also differences in the dry and wet season in eastern China. Inter-annual and decadal amplitude of variation in dry season is significantly higher than that in wet season. Compared with the wet season, spatial consistency change is better in dry season. Besides, the time of dry and wet have changed in recent years. The dry season delays while the wet season comes ahead in eastern China, which suggests that both the dry and wet seasons last longer. (4) In addition, in the last half a century, both the dry and wet seasons in north China show a significant trend of drought, but there are not the similar features in south China.

Key words： Climate change; Drought; Aridity index; Drought and flood Ch; Dry and wet seasons

Cite this article

ZHANG Hongli , ZHANG Qiang , LIU Qian , YAN Pengcheng . Analysis on Variation Characteristics and Differences of the Climate Drying Degree between South and North of China[J]. Plateau Meteorology, 2016 , 35(5) : 1339 -1351 . DOI: 10.7522/j.issn.1000-0534.2015.00099

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