近50年锡林郭勒盟地区沙尘暴突变特征分析

[目的]分析锡林郭勒盟地区沙尘天气的发展趋势，从而更好地预报和预防沙尘天气，保障农业生产发展。『方法]采用线性倾向估计和Mann—Kendall突变检验法，分析近50年锡林郭勒盟地区沙尘暴天气变化的特点。[结果]锡林郭勒地区沙尘暴一年四季均可发生，春、冬两季发生最多，夏季次之，秋季最少。春季是沙尘暴天气现象最频发季节；近50年锡林郭勒盟的平均沙尘暴日数都有明显的下降趋势，以春季的下降趋势最显著，秋季下降幅度最小；近50年锡林郭勒盟年季平均沙尘暴日数均存在年代际变化的突变现象。[结论]总体来看，锡林郭勒盟的沙尘暴是从一个相对较多的平均态转变到一个相对较少的平均态。

Analysis on Mutation Characterization of Sandstorms of Xilinguole League in Recent 50 Years

[Objective]The main purpose was to understand the development trend of sand dust weather in Xilinguole region, so as to forecaste and prevente sand dust, so as to ensure the developm- ent of agricultural production. [Method] The linear trend test method and the Mann-Kendall test techniques were applied to detect sandstorms changes in the last 50 years in the Xilinguole region. [Result]The analysis results showed that： the Xilinguole area dust storms could occur throughout the year, and it occured most frequently in spring and winter, but occured the least in summer and autumn. Spring was the season of the most frequent sandstorm weather phenomena~ The average number of sand dust storm days in Xilinguole region over the last 50 years had significantly decreased, with the most significant downward trend in spring, and the smallest decline in autumn. There were decadal variation mutation in the season average sandstorm days of Xilinguole League in recent 50 years. [Conclusion]Overall, sandstorms in Xilinguole League changed from a relatively high state to low.