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近54年内蒙古自治区西部沙尘暴的变化趋势
马潇潇, 王海兵, 左合君
内蒙古农业大学 沙漠治理学院 内蒙古风沙物理与防沙治沙工程重点实验室, 内蒙古 呼和浩特 010011
摘要:
[目的]研究近54 a内蒙古自治区西部沙尘暴天气发生频次的变化特征,为该区沙尘暴天气的科学预测和防治提供理论依据。[方法]采用线性回归、5 a滑动平均、小波分析、滑动t检验、Mann-Kendall检验方法分析内蒙古自治区西部24个气象站点沙尘暴日数的变化趋势、周期性、突变性等特征。[结果]①近54 a来沙尘暴天气发生频次可分为高频期(1960-1975年)、快速减少期(1976-1992年)和低频期(1993-2013年)。沙尘暴发生的频次分别为17,9和4 d/a;发生频次的周期性存在31,22,13 a三个长周期和5,8,1.5 a三个短周期的波动变化。②1986年前后沙尘暴发生频次出现了明显的突变现象,1976-1986年的线性递减率为0.76 d/a,1987-1992年的线性递减率为1.4 d/a。[结论]近54 a内蒙古自治区西部沙尘暴日数变化呈波动下降趋势,且存在明显的周期性和突变性特征。
关键词:  沙尘暴日数  小波分析方法  周期性  突变性  内蒙古自治区西部
DOI:10.13961/j.cnki.stbctb.2019.04.003
分类号:P954
基金项目:内蒙古农业大学人才项目"戈壁地表沙尘过程研究"(NDYB2017-3)
Variation Trend of Sandstorm in Western Inner Mongolia Autonomous Region in Recent 54 Years
Ma Xiaoxiao, Wang Haibing, Zuo Hejun
College of Desert Control Science and Engineering, Inner Mongolia Key Laboratory of Aedian Physics and Desertification on Control Engineering, Inner Monglia Agricultural University, Hohhot, Inner Monglia 010011, China
Abstract:
[Objective] The variation characteristics of sandstorm weather frequency in Western Inner Mongolia Autonomous Region in the recent 54 years were studied in order to provide theoretical basis for its scientific prediction and prevention and treatment.[Methods] Through the methods of linear regression, 5-year sliding average, wavelet analysis, moving t test and Mann-Kendall, the changing trend, periodicity and mutagenicity of sandstorm day number of 24 meteorological stations in Western Inner Mongolia Autonomous Region were analyzed.[Results] ① In the recent 54 years, the frequency of sandstorm weather could be divided into high frequency period(1960-1975), rapid attenuation period(1976-1992) and low frequency period(1993-2013). The frequency of dust occurrence was 17, 9, 4 days per year, there were 31, 22, 13 years long periods and 5, 8, 1.5 years short cycles. ② There was an obvious mutation in the frequency of sandstorm around 1986. The linear decrement rate of 1976-1986 was 0.76 day per years, that of 1987-1992 was 1.4 days per years.[Conclusion] In the recent 54 years, the change of sandstorm day number in Western Inner Mongolia Autonomous Region showed a fluctuating trend, and there were obvious cyclical and mutagenic characteristics.
Key words:  sandstorm days  wavelet analysis  periodicity  mutagenicity  Western Inner Mongolia Autonomous Region