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《Journal of Arid Meteorology》 2017-04
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Spatial-temporal Characteristics and Influence Factors of Total Cloud Cover in Qinghai Province During 1961-2015

ZHANG Xiaojun;MA Xueqian;TIAN Jianbing;Weather Modification Office,Qinghai Meteorological Bureau;  
Based on the observation data of 46 meteorological stations in Qinghai during 1961-2015,the spatial-temporal characteristics and influence factors of total cloud cover were analyzed by using the empirical orthogonal function(EOF) and Mann-Kendall test.The results show that the maximum total cloud cover was 64%,the minimum was 48%,and the average was 57% in Qinghai. The total cloud cover showed a decreasing trend with the average rate of-0. 006% a-1,and the maximum was-0. 187% a-1,which passed the significant level of 0. 05. The abrupt change of the total cloud cover occurred in 1979. From EOF analysis of total cloud cover anomaly,the variance contribution rate of the first pattern reached 49. 97%,which presented the consistency change feature of total cloud cover in Qinghai,while the second pattern showed an opposite change of total cloud cover for the northern and southern parts of Qinghai,and the third pattern corresponded well with the complex landforms of Qinghai Province,which was influenced by the large mountains. The correlation coefficients were calculated between time coefficients of the first three patterns from EOF of total cloud cover anomaly and meteorological factors. The time coefficient of the first pattern was negatively correlated with temperature and sunshine hours,but positively correlated with relative humidity,precipitation and evaporation. The time coefficient of the second pattern was closely and negatively related to temperature,and positively related to humidity,sunshine hours and evaporation.
【Fund】: 国家自然科学基金地区科学基金项目(41665008);; 国家留学基金委西部地区人才培养计划共同资助
【CateGory Index】: P426.53
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