摘要
利用四川省156个国家级地面观测站1981~2013年的整编观测资料,统计分析了四川省雨、雪与雨夹雪日数的年平均、月平均特征以及雨雪转换情况,并采用线性趋势法、M-K检验来对不同相态降水的时空分布及气候变化特征进行了定量分析。结果表明:(1)四川地区年平均降雪日数和雨夹雪日数呈"西多东少"型分布,年降雨日数则呈"东多西少"的分布特征;(2)盆地中部、南部雨雪转换年平均日数为0.1~2日,盆地西部丘陵一带为3~5日,川西高原雨雪转换日数在10日以上,攀枝花几乎全年无雨雪转换,凉山州呈现西少东多的形势;(3)从线性趋势法、M-K检验及突变都可以看出,四川地区不同降水相态年发生日数总体都在减少。
Using the reorganization observed data from 156 national stations during 1981 ~ 2013 in Sichuan Province,statistical analysis the annual mean and monthly mean characteristics of rain day,snow day and sleet day,and the rain- snow transition condition. Using linear- trend method,Mann- Kendall test,quantitative analysis the spatial- temporal distribution and climate change characteristics of precipitation- phase in Sichuan. The results show that:( 1) the annual mean snow day and sleet day show the distribution of "west more and east less",the annual mean rain day show "east more and west less";( 2) the mean rain- snow transition days in the middle and southern of Basin is 0. 1 ~ 2,the days in the Western hills is 3 ~ 5,the days in the west Sichuan highland is more than 10,there is no rain- snow transition in Panzhihua,the days in Liangshan show " west less and east more";( 3) from the linear- trend method,Mann- Kendall test,we find that the days of different phase precipitation is decreasing,the Sichuan Province in drying.
出处
《高原山地气象研究》
2015年第1期21-26,共6页
Plateau and Mountain Meteorology Research
基金
四川省气象局青年基金(川气课题2014-青年-06)
中国气象局气象关键技术集成与应用(重点/面上)项目长江上游持续性强降水集合预报技术集成应用(CMAGJ2014M48)
成都信息工程学院科研基金(KYTZ201413
CRF201401)
国家自然科学基金(41405036)