RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2009, Vol. 18 >> Issue (7): 620-.

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VARIATION AND INFLUENCING FACTORS OF PAN EVAPORATION IN ANHUI PROVINCE IN LATEST 45 YEARS

  

  1. 1.Anhui Province Climate Center,Anhui Province, Hefei 230031, China|2.Taishan Meteorological Bureau,Guangdong Province, Taishan 529200, China
  • Online:2009-07-20

Abstract:

Annual and seasonal variations analyzed by linear tendency estimate and MannKendall test of 20 cmpan evaporation of 32 meteorological stations over the YangtzeHuaihe River in Anhui Province from 1963 to 2007 indicated a significant negative trend (-65.3 mm/10 a，confidence level of 001).The jump point of the evaporation happened in 1976,and the obvious variation in 1982.The most remarkable decrease happened in summer.The evaporation had a significant negative trend of 24 stations and a positive trend (confidence level of 005) of only 1 station,which shows a spatial declining trend of more in North and less in South.Combining with other research on the impact climate factors of pan evaporation (7 factors:temperature，sunshine duration，daily temperature rang,wind speed，relative humidity，precipitation and lowcloud),the main result indicated as follows:(1)the annual temperature increased and pan evaporation decreased,therefore the “pan evaporation paradox” actually existed in Anhui Province,but the correlation between temperature and pan evaporation was not significant;(2)the pan evaporation had significant negative correlation with the sunlight，daily temperature range and wind speed，meanwhile the lowcloud cover,precipitation and relative humidity may also play an important role in an unknown mechanism.

Key words: climatic change, pan evaporation, features of variation, impact factors, pan evaporation paradox, Anhui Province

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