1958—2007年秦岭南北气候变化的差异性分析

Differential analysis of abrupt climate change between southern and northern Qinling Mountains in the past 50 years

基于1958—2007年关中与陕南地区气温、降水实测数据,分析了50 a来秦岭南北气候变化的差异,研究表明:近50 a来,关中和陕南地区气候总体呈"暖干化"趋势,年均气温明显升高,而年降水量普遍减少;关中地区年均温在1990年发生突变,降水突变年为1985—1986年,秋季均温、降水突变年分别为2000年、1976年,冬季均温在1993年发生突变,降水突变不明显;陕南地区年均温突变年为1998年与2003年,1990—1991年降水突变,秋季均温、降水突变年份分别为2000年和1985—1986年,冬季均温突变年为1995—1997年,降水突变发生于2000年.由此得出:关中气候突变年份早于陕南,全球气候变化与区域人类活动为可能诱发因素;秦岭南北降水突变年份大多早于气温突变年份,相关机理仍待进一步研究.

Based on the temperature and precipitation data from 1958 to 2007,the differences in climate change between southern and northern Qinling Mountains were analyzed.The results revealed that the general trend of climate appeared to be warmer and drier in the past 50 years.The annual mean temperature rose and the annual precipitation decreased.The abrupt change of annual mean temperature in Guanzhong region happened in the year of 1990,and the abrupt change of mean temperature in autumn and winter appeared in 2000 and 1993;On the other hand,the annual precipitation abrupt change occurred in 1985-1986,and autumn precipitation abrupt change occurred in 1976,but it was not obvious in winter.In Shaannan region,the year of 1998 and 2003 are the abrupt change years of annual mean temperature.Autumn temperature abrupt change happened in 2000,and the abrupt change of mean temperature of winter appeared in 1995-1997.The precipitation abrupt change year of annual,autumn and winter are 1990-1991,1985-1986 and 2000,separately.The conclusions are as follows： Due to global climate change and regional human activities,the climate abrupt change in Guanzhong region came earlier than that in Shaannan region.The precipitation abrupt change came earlier than that of temperature in both southern and northern Qinling Mountains.The related reasons remain to be further discussed,nevertheless,it inspired us.