摘要
基于四川地区5个站点1960~2004年的日降水观测资料,对其在等级分析的基础上探讨了幂律分布的规律,结果如下：（1）这5个站点日降水存在的一个共同特征—幂律尾分布,且不同等级的降水量对应不同的幂律尾指数,在一定程度上反映了不同雨型具有不同的气候背景和物理机理;（2）小雨幂指数随时间变化很小,中雨幂指数随时间变化较大,从80年代末期开始,四川盆地西部与南部地区中雨幂指数增加,中雨降水减少,川西高原、四川盆地东部与北部地区中雨幂指数减小,中雨降水增加。因此,中雨的变化可能会引起总降水量的变化。
The daily precipitation observational data of 5 stations of Sichuan from 1960 to 2004 are divided in sections,statistically and power-low distribution analyzed. The result shows that,（ 1） the daily precipitation of the five sites has a common feature-power-law distribution,and different levels of rainfall for different power-law exponent,to a certain extent,it reflects that the different rainfall patterns with different climate background and the physical mechanism;（2） the light rain exponent is changed very little over time,but the moderate power exponent is changed dramatically. Starting from the late80,the moderate power in the south and west of Sichuan correspond to the reducing trend with the increase of the power-law exponent,and in the east and north and the plateau of Sichuan shows the trend of increase with the reducing of the power-law exponent. So the changes of total precipitation may be caused by the moderate power changes.
出处
《高原山地气象研究》
2016年第1期44-51,共8页
Plateau and Mountain Meteorology Research
关键词
统计分析
幂律指数
降水变化
sichuan
statistically analyzed
power-law exponent
rainfall change
