Title: Climatic change of sunshine duration and its influencing factors over Heihe River basin during the last 46 years.
Abstract:Using the data of monthly sunshine duration,mean cloudiness,surface vapor pressure and precipitation at 10 meteorological stations over Heihe River Basin from 1960 to 2005,the trend variation of the s...Using the data of monthly sunshine duration,mean cloudiness,surface vapor pressure and precipitation at 10 meteorological stations over Heihe River Basin from 1960 to 2005,the trend variation of the sunshine duration were analyzed by using linear trend analysis.Main results were as follows:(1) On an average in Heihe River Basin,the annual sunshine duration showed decreasing tendency during recent 46 years with a decreasing rate of 1.77 h/10a over.Specifically,in recent 25 years,the reducing trends became more significant.In autumn and winter,the sunshine durations showed a decreasing tendency,but in summer its increasing tendency became more significant.(2)In the 1960s,the sunshine durations were positive in all seasons.In the 1970s,except winter,the sunshine durations were lower in other seasons.In the 1980s,the sunshine durations were more sufficient in spring and autumn,while lower in summer and winter.In the 1990s,the sunshine durations were lower in spring,while more sufficient in other seasons.(3)Results indicated that the main causes for the increase of sunshine duration in summer were the obvious decrease of cloudiness.The decrease of sunshine duration in annual and autumn mainly caused by the significant increase of surface vapor pressure and precipitation.Read More
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 2
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