基于SPI指数的辽宁省气象干旱时间特征分析

The analysis of temporal change rules of meteorological drought over the Liaoning province based on SPI

基于辽宁省22个气象站1960-2014年的逐月降水数据,选取标准化降水指数作为旱涝评价指标,对辽宁省55a间的气象干旱多尺度时间特征进行分析。结果表明:(1)辽宁省的降水情况呈现出明显周期性,以5年为周期,在干旱与轻涝间变化。(2)辽宁省季节性干旱上,存在着春、冬旱趋势相近,夏、秋旱趋势相近的整体特征。

On the basis of the Liaoning Province 22 meteorological station in 1960-2014 monthly precipitation data,the standardized precipitation index selection as the drought and flood evaluation index,to 55 years in Liaoning province meteorological time characteristic analysis.Results show that:(1)The precipitation of Liaoning province shows obvious periodicity,with a period of 5 years,which changes between drought and light waterlogging;(2)On the seasonal drought in Liaoning province,the trend of drought in spring and winter is similar,summer and autumn is similar.