1957-2013年陕北地区降水特征分析

Analysis of Precipitation Characteristics in Northern Shaanxi from 1957 to 2013

利用陕北地区10个雨量站1957-2013年的逐日降水数据,采用滑动平均、累积距平、线性倾向估计法分析区域降水变化特征。结果显示:陕北地区降水量整体呈减少趋势;降水年内分布不均,主要集中在夏季,占全年降水量的一半多;春季、夏季、秋季大部分站降水量呈减少趋势,冬季降水量变化趋势不明显;总降水日数、小雨日数、中雨日数均呈现减少趋势,大雨以上日数变化不明显。

Based on the daily precipitation data of 10 rainfall stations in northern Shaanxi from 1957 to 2013, the regional precipitation variation characteristics were analyzed by using the moving average, accumulated anomaly and linear tendency estimation. The results showed that the precipitation in northern Shaanxi showed a decreasing trend as a whole, the precipitation was uneven in a year, mainly concentrated in the summer, accounting for more than half of the annual precipitation. The precipitation in most stations in spring, summer and autumn showed a decreasing trend, and The precipitation trend of change in the winter is not obvious. The total number of precipitation days, the number of light rain days and the number of mid-rainfall days all show a decreasing trend, and the change of the days above the heavy rain is not obvious.