新疆天山极端干湿事件时空演变特征

基于新疆天山26个气象站1960—2017年的气象资料,采用FAO Penman-Monteith模型计算了各气象站月地表湿润指数,标准化后统计极端干湿事件频率.运用线性趋势分析法、反距离加权法探究了极端干湿事件频率的时空演变特征,并采用相关分析、偏相关分析及交叉小波分析分别探讨了气象因子和大气环流对极端干湿事件变化的...

Spatio-temporal evolution of the extreme dry and wet events in Tianshan Mountains,Xinjiang,China

The FAO Penman-Monteith model was used to calculate the monthly surface humid index at 26 meteorological stations in the Tianshan Mountains,Xinjiang,China,based on their meteorological data from 1960 to 2017.The extreme dry and wet event frequencies were calculated after standardizing the data.Subsequently,the Mann-Kendall trend analysis and inverse distance weighting methods were used to explore their spatio-temporal evolutionary characteristics.Pearson and partial correlation analyses and cross wavelet transform were used to investigate the influence of meteorological factors and atmospheric circulation on the extreme dry and wet events.The results showed that(1)the interannual decrease and increase in extreme dry and wet events were-0.40 and 0.37 times per decade,respectively.The highest occurrence of extreme dry and wet events and the largest decrease in extreme dry events occurred in summer,while the largest increase in extreme wet events was in autumn;(2)the northern slope exhibited the highest incidence of extreme dry and wet events,with a frequency of 4.36 and 2.76 times a year,respectively.It also exhibited the fastest rate of decline in extreme dry and increase in extreme wet events,with an average annual incidence of-0.75 and 0.58 times per decade,respectively;and(3)the average relative humidity was the primary meteorological factor influencing the changes in extreme dry and wet events in the region,and the El Ni?o-Southern Oscillation was the main atmospheric circulation factor.