| 天气与气候 |
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| Primary Study on Regional Characteristics of Solar Radiationin China during 1961—2000 |
| WEN Xiao-hang, SHANG Ke-zheng, WANG Shi-gong, YANG De-bao, FAN Wen-yan |
| Gansu Key Laboratory of Arid Climate Change and Reducing Disaster, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China |
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Abstract By using the data of global radiation, direct radiation and scatter radiation from 112 stations, and cloud cover from 729 stations in China during 1961 to 2000, the inter-decadal anomaly spatial distribution and change were analyzed. Based on the value of global radiation, we divided whole China into 5 radiation areas, and then analyzed their variation characteristics of solar radiation. Results show that: ①Global radiation and direct radiation declined from 1961 to 1990, reaching the lowest at 1980’s and being obviously at the southwest of Qinghai-Xizang Plateau; increased from 1990 to 2000, being significant in Qinghai-Xizang Plateau, but the solar radiation did not reach the highest value in history. The decreasing rate of global radiation in the above five regions was respectively -1.24%, -1.66%, -1.60%, -1.89% and -1.93% per ten years during the 40 years. ②In the 40 years, the variation of scatter radiation was not significant in northeast China, but declined in south Xinjiang and Qinghai-Xizang Plateau and a little increase in south China. ③The low cloud cover increased in northwest China, and both total cloud cover and low cloud cover decreased in the other areas. The declining rate of total cloud cover in the above five regions was respectively -2.99%, -1.68%, -3.10%, -1.17% and -1.01% per ten years; those of low cloud cover was respectively -1.51%, 4.46%, -1.47%, -0.89% and -0.75% per ten years. At last, the reasons for long-term variation of radiation were discussed.
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Received: 13 August 2007
Published: 20 May 2008
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2008, Vol. 28 
