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地理科学  2011 

季风区边缘近500年的降水变化特征

, PP. 401-407

Keywords: 季风区边缘,石笋氧同位素,旱涝指数,阶梯式过渡降水

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Abstract:

基于武都万象洞高分辨率石笋δ18O和高精度230Th定年数据,结合利用周边地区史料恢复的旱涝指数序列,重建季风区边缘近500a以来降水变化。结果显示在年际至百年时间尺度上,万象洞石笋δ18O变化指示亚洲季风带来的降水量信息。季风区边缘降水变化可分减弱期(1470~1700A.D.)、平稳期(1701~1875A.D.)和增强期(1876~2003A.D.)三个气候段,其间季风降水的强弱变化响应史料记载的极端旱涝事件。在小冰期向20世纪暖期转换过程中,本区呈现阶梯式过渡降水模式,这是一种较大空间尺度上气候特征,在年代际至百年时间尺度上与北半球温度、中国温度变化具有同步性。

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