1961~2018年共和盆地沙尘天气变化特征分析

Characteristics of dust weather in Gonghe basin during the period of 1961 ~ 2018

利用共和盆地3个气象站1961~2018年逐月沙尘天气观测资料,采用Mann-Kendall检验、Morlet小波分析等方法,分析了近59年间盆地沙尘天气的变化特征和趋势.结果表明:(1) 1961~2018年盆地沙尘天气日数呈波动下降趋势,减速为0.5d·a-1;(2)盆地沙尘天气日数的季节变化从春季到冬季呈"V"字形变化,且春季>冬季>秋季>夏季;(3)小波分析显示盆地沙尘天气变化存在8年、16年和27年的周期,其中8年周期最显著,目前盆地处在沙尘天气减少期.

Based on the monthlydust weather data collected from three meteorological stations in the Gonghe Basin,this paper analyzed the characteristic and change trend of dust weather days during the past 59 years,with the Mann-Kendall test and Morlet wavelet analysis. The results showed that:( 1) The number of days of dust weather in the basin from 1961 to 2018 shows a fluctuating downward trend,and the deceleration is 0. 5 d·a-1.( 2) Curve of the seasonal variation of dust weather days was "V-shaped"from spring to winter,that was to say,the most dust weather days appeard in spring and winter,and then in summer and autumn;( 3) Wavelet analysis shows that the dust weather days fluctuated significantly with the interval of 8 a,16 a and 27 a,and the 8 a interval is the most significant. It is currently in the period of dusty weather reduction.