华南南部前汛期气温异常的时空变化特征

Spatial/Temporal Variations of Pre-flood Period Air Temperature in the South of South China

利用国家气候中心整编的1951—2000年中国160个站的月平均气温资料,根据"九五"重中之重项目执行组指出的华南地区代表站,选出华南南部地区12个代表站。侧重分析了华南南部前汛期气温异常的季节、年际和年代际变化的时空特征。发现在年代际变化方面,20世纪60年代中期到80年代末为相对低温期,90年代以后温度有明显升高的趋势,而且50a温度变化的总趋势是增加的。华南南部前汛期气温异常存在2a、4a、5a的年际周期和12a和19a的年代际周期;在空间上,华南南部前汛期气温增暖的幅度相对较弱,华南南部的前汛期气温与全国大部分地区呈现同位相的变化特征,与个别地区呈反位相。

By use of the monthly mean air temperature data at 160 stations in China during 1951—2000.12 stations are selected as representative stations in the south of South China. Based on the analysis of seasonal and interannual variations,the interannual and interdecadal variations of the air temperatures in the pre-flood period in the south of South China are emphatically studied in this paper.It is found that the air temperature in the pre-flood period in the south of South China are slightly colder before the 1990's,and get much warmer in the 1990's.The warming trend is obvious in the recent 10 years.The pre-flood period air temperature anomaly show the 2-year,4-year,5-year,12-year and 19-year periodic variations in the south of South China.The warming trend is similar with that in most areas of China.