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地理学报  2014 

祁连山老虎沟冰芯记录的高山区大气降水变化

DOI: 10.11821/dlxb201405011, PP. 681-689

Keywords: 老虎沟,冰川净积累量,气候,祁连山,冰芯记录

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Abstract:

冰芯所记录的积累量是恢复高山区过去降水变化最可靠的指标。2006年在青藏高原东北缘祁连山老虎沟12号冰川粒雪盆海拔5040m处钻取了的一支20.12m的冰芯,利用其年积累量估算了1960-2006年期间的冰川区降水量,结合2010年实测资料,分析了这一时期降水变化特征并研究其与周边其他地区降水变化的关系。结果表明,在过去50年中,高山冰川区降水量表现出先增加后减少的趋势。在1960-1980年,降水量表现出明显增加趋势,1980-2006年表现出明显减小趋势。重建的冰川区降水量变化与临近低海拔区的肃北气象站降水变化有很好的一致性,二者相关系数为0.619(P<0.001),而量级上高山区是低山区的约3倍。祁连山老虎沟冰川区降水与周边的敦德冰芯同期的累积量、树轮重建降水、青藏高原东北部多个气象站点的实测降水,以及临近区域格点PDSI干旱指数变化对应较好。此外,近50年来祁连山老虎沟冰川区及毗邻的青藏高原东北部地区降水变化与ENSO呈正相关关系明显,反映了该地区高海拔大气降水变化很可能受ENSO的影响。

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