摘要
根据沙尘天气标准确定了1961～2003年天津逐年的春季沙尘天气日数且形成序列,分析了春季沙尘天气的演变规律,并应用小波分析方法分析了其多时间尺度的变化特征.结果表明:天津地区春季的沙尘天气以每10年-5.9天的变化速率呈显著的下降趋势;20世纪60～70年代处于沙尘多发期,90年代最少;春季沙尘天气具有40年、4～6年和16年的明显周期.t检验结果显示,气候突变大约发生在1980年前后.
The annual dust storm serials from 1961 to 2003 was established according to the Standards of Dust Storm in Spring in Tianjin, and the variation characteristics of multi-scale dust storm activities were analyzed by the wavelet analysis method. The results show that dust storms decreased significantly in the past 43 years with the change rate being - 5.9 day per ten years. Dust storms occurred more frequently in the 1960s and 1970s and less in the 1990s. It is al~ found that there are significant periods of 40 years, 4 to 6 years, 16 years in the number of dusty days in spring. The climate jump of dust storms in Tianjin is found around 1980 by t-test.
出处
《气象科技》
2005年第6期513-515,共3页
Meteorological Science and Technology
基金
天津市科委科技攻关项目"天津地区沙尘天气监测
预报服务及防止沙尘对策的研究"资助
关键词
春季沙尘
变化规律
小波分析
dust storm in spring, variation regularities, wavelet analysis
