【摘要】 本文利用1954-2001年北京地区(20个气象站)逐月沙尘资料,重点对北京地区沙尘天气的空间分布特征、沙尘日数的年代变化规律、沙尘日数的月变化进行分析;分析了近三年北京地区出现沙尘天气特点及成因;同时对近48年的沙尘出现日数变化规律进行了小波分析。更多还原

【Abstract】 Based on the surface-meteorological observation data from 20 stations in Beijing area from 1954 to 2002, investigation has been conducted for the temporal and spatial distribution characteristics, especially long-term trend and variation of sand-dust storms, and monthly variation in Beijing area in recent 48 years. We have analyzed the characteristics and formative causes of sand-dust storms in Beijing in recent 3 years. we have found some variation of sand-dust storms by wavelet analysis.更多还原