1961—2011年赣州地区云量的变化特征

Variation characteristics of cloud cover in Ganzhou from 1961 to 2011

利用赣州2个国家基本气象站(赣县和寻乌)1961--2011年逐日4次总云量和低云量观测资料,采用回归分析方法,分析了月、季、年的变化规律。结果表明,赣州总云量6月最多,12月最少;低云量3月最多,7月最少;总云量赣县比寻乌多,但低云量赣县比寻乌少。四季总云量的变化趋势有所不同,主要表现在21世纪以后赣县夏、秋季总云量呈增加趋势,而寻乌夏、秋季总云量呈减少趋势。低云量四季的变化趋势都呈增多的趋势。近51a赣县年平均总云量有弱的增多趋势,而寻乌年平均总云量则有弱的减少趋势。年平均低云量的变化趋势都是增多的,赣县年变化趋势为0.24成/10a,寻乌为0.26成/10a。

Based on four daily observations of total cloud cover and low cloud cover at two national meteorological stations (Ganxian and Xunwu) in Ganzhou from 1961 to 2011,the monthly,seasonal and annual variations were analyzed by means of regression analysis.The results show that the total clouds cover in Ganzhou is the most in June and the least in December,the most of low cloud cover in March and the least in July.The total cloud cover in Ganxian is more than that in Xunwu,but the low cloud cover is less in Ganxian than in Xunwu.The variation trend of total cloud cover in four seasons is different,after the 21st century,Ganxian's the total cloud cover in summer and autumn is increasing,but Xunwu's one in summer and autumn is decreasing.The change trend of low cloud cover in the four seasons is increasing.In recent 51a,the annual average total cloud cover of Ganxian has a bit increasing trend,but a bit decreasing trend in Xunwu.The annual mean low cloud cover increased,with an annual variation trend of 0.24%/10a in Ganxian and 0.26%/10a in Xunwu.