| 天气与气候 |
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| Spatio-temporal Change Characteristics of Sunshine Hour in Shiyang River Basin in Recent 50 Years |
| ZHANG Ke-xin, LIU Pu-xing, HUO Hua-li, ZHANG Rui, MA Ya-lan |
| College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China |
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Abstract Based on the sunshine hour data from 5 weather stations in Shiyang River basin during 1959—2008, the spatial and temporal variety of the sunshine hour was analyzed with methods of climate trending rate analysis, Kriging interpolation, Mann-Kendall abrupt change test and wavelet analysis. The annual sunshine hour in Shiyang River basin obviously increased at a trending rate of 33.9 h/10a. The sunshine hour increased in all seasons, and the increasing rate in spring was the most significant, which made the greatest contribution to the increase of annual sunshine hour. The spatial distribution of sunshine hour in Shiyang River basin was quite different, and the sunshine hour increased from the south to north. The abrupt change of sunshine hour in Shiyang River basin happened in 1987. Morlet wavelet analysis showed that variation of sunshine hour in Shiyang River basin had a period of 8 years.
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Received: 05 August 2010
Published: 20 March 2011
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2011, Vol. 31 
