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树轮揭示的藏东南米堆冰川小冰期以来的进退历史

, PP. 380-389

Keywords: 青藏高原,冰川进退,树木年轮,小冰期,气候变化,冰碛垄

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Abstract:

?利用冰川前端冰碛垄上的树轮年代学证据,对冰碛垄形成年代进行定年,重建了青藏高原东南部米堆冰川小冰期以来的进退波动历史.在对冰碛垄进行定年时,我们对树龄进行了髓心年龄估计和取样高度年龄校正,并考虑了先锋树种的定居期.最老树木的年龄显示,小冰期以来,米堆冰川至少经历了四次明显的冰川进退波动,分别为AD1767(TM1-LM1),AD1875(LM2),AD1924(LTM-LM3)和AD1964(TM2),其中AD1767(TM1-LM1)对应小冰期冰盛期,冰川前进达到最大规模.米堆冰川波动历史与中国和北半球其他地区冰川的波动呈现较高的空间一致性.与藏东南地区夏季温度变化重建的对比表明,百年时间尺度上米堆冰川进退波动与温度冷暖变化趋势相对应,在年代际尺度上,冰川进退波动与温度变化存在约8a的滞后期.

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