华南地区近40年降水的气候特征
CLIMATE CHARACTERISTICS OF PRECIPITATION OF THE RECENT 40 YEARS IN SOUTH CHINA
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摘要: 利用1951-1994年华南地区15个站的月降水量资料,探讨了这一地区近40年来降水的气候特征。结果表明:(1)华南地区年降水量的变化存在一定的阶段性和周期性,50年代和70年代及90年代前期降水相对偏多,60年代和80年代降水相对偏少。近40年来降水量的变化趋势呈抛物线型,总的来看,前20年少,后20年略有增多。(2)降水变化具有明显的周期性振动,年和汛期(4-9月)降水的主周期为7-11年,前汛期和后汛期降水都存在准3年周期性振荡。Abstract: The data of monthly rainfall at 15 stations in South China from1951 to 1994 are used to discuss the climate characteristics of precipitation of the recent 40 years in this area. The conclusions are as follows: (1) The variation tendency of the annual precipitation is a parabolic curve, the first two decades are on the lower side, and the last two decades on the higher side. (2) The precipitation variations have significant periodic oscillation. There are principal cycles of 7-11 years for both yearly and flood season rainfall, and quasi-cycles of 3 years for rainfall in both.
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