辽宁人工增雨试验区最长连续降水日数变化分析

Variation Analysis of the Longest Consecutive Precipitation Days in Liaoning Artificial Precipitation Test Area

利用辽宁省1961～2008年5～9月人工增雨作业季节的日降水资料,从48年的降水资料中选出5～9月各月中最长连续降水日数作为基础,以人工增雨试验区平均值作为研究对象。结果表明,人工增雨试验区48年的最长连续降水日数各月的平均变化趋势率5、6月呈上升趋势,增幅分别为0.120和0.123d/10年;7、8、9月的趋势率呈下降趋势,分别为-0.236、-0.034和-0.079d/10年。由此体现出辽宁省在5月的人工增雨作业对于试验区最长连续降水日数的影响起到了积极作用。

According to daily precipitation data in artificial precipitation season during May to September from 1961 to 2008 in Liaoning Province, the average days in the artificial precipitation test area is studied based on the longest consecutive precipitation days selected from May to September in 48 years. The results show that the average variance trend rates of the longest monthly consecutive precipitation days in May and June increase at rate of 0. 120 day/10 a and 0. 123 day/10 a, while the trends rate of declination are - 0. 236 day/10 a - 0. 034 day/10 a and -0. 079 day/10 a in July, August and September. It means artificial precipitation of Liaoning in May has active affect on the longest consecutive precipitation days in the test area.