中国区域月降水量的多时间尺度特征

根据国家气候中心气候预测室的降水分区方法，使用1951年1月到1998年12月的分区月降水指数资料，采用小波分析方法分析了中国区域月隆水的多时间尺度特征。研究结果得出：对全国平均而言，20世纪50年代和90年代为我国降水偏多期，60年代和80年代为降水偏少期；中国大部分地区降水都存在8年以上的长周期变化和2-4年周期的变化，但后者呈现出明显的不规则性。

Mult i-tmi e ScalesCharacters ofA reaMonthly Prec ip itation inChina

Based on the precipitation sectors defined by climate-predicting workshop of national climate center of China, this paper analyzed the multi-time scales characters of area monthly precipitation in China with the wavelets method in terms of the area monthly precipitation index data from January of 1951 to December of 1998. The results show that, to the Chinese average precipitation, precipitation exceeded the average in 1950s and 1990s, and were below the average in 1960s and 1980s; The precipitation in most areas of China contained the long period variation upwards of 8 years and 2 to 4 years period variation, but the latter's variation showed obvious irregularity.