摘要
文章采用中国气象局1960-2011年间东北地区71个气象站观测的实测日降水量,分析了ETCCDI 12个极端降水指数的时空分布。研究结果表明:连续干旱天数CDD表现出减少的趋势,在0. 05水平上显著下降,而其他降水指数均没有表现出显著下降趋势。极端降水事件的增加和减少在空间上表现出很大的差异。极端降水指数存在周期为7a、14a和17a的显著周期性变化。1960-2011年,极端降水对总降水的贡献在减少,除连续干旱日数CDD外,年总降水量和极端降水量之间存在显著的相关性。
In this paper,the temporal and spatial distribution of 12 ETCCDI extreme precipitation indexes is analyzed by using the measured daily precipitation observed by 71 meteorological stations in northeast China from 1960 to 2011. The results show that CDD shows a decreasing trend in consecutive drought days,with a significant decrease at the level of 0. 05,while other precipitation indexes do not show a significant decreasing trend. The increase and decrease of extreme precipitation events show great differences in space. The extreme precipitation index has significant periodic changes with periods of 7 years,14 years and 17 years. During the period of 1960 to 2011,the contribution of extreme precipitation to the total precipitation decreased. Except for the consecutive drought days CDD,there is a significant correlation between the annual total precipitation and extreme precipitation.
作者
李非
LI Fei(Liaoning Water Resources Management Group Co., Ltd., Shenyang 110000,China)
出处
《黑龙江水利科技》
2019年第7期16-20,共5页
Heilongjiang Hydraulic Science and Technology
关键词
极端降水
时空分布
周期性
相关性
extreme precipitation
temporal and spatial distribution
periodicity
correlation
