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青藏高原全新世降水序列的集成重建

DOI: 10.11820/dlkxjz.2012.09.001, PP. 1117-1123

Keywords: 集成重建,降水,青藏高原,全新世

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Abstract:

青藏高原全新世降水变化对于过去全球变化研究有重要意义。在过去全球变化研究中,大尺度区域降水序列重建缺乏可行、有效的方法,本文以青藏高原作为研究区,构建了分区古降水空间模拟-多区面积加权的集成方法,重建全新世青藏高原降水序列。本研究以孢粉为环境证据,选取有空间代表性的10条由孢粉重建的高原样点降水序列,获得716条具有年代的定量降水记录,建立全新世古降水记录数据集。借助GIS分析,基于现代高原降水空间分布的地理因子模拟,并与古降水记录相集成,定量重建了高原全新世200年分辨率的降水序列。结果显示早全新世高原降水迅速增多,并在9.0kaBP达到极大值500mm,较现代高170mm;9.0~5.6kaBP是旺盛的湿润期,降水总体比现代高出80mm,但呈现明显的下降趋势;5.6kaBP以来降水减少,降水与现代相当,但波动幅度较小;集成序列与其他高低分辨率环境记录有很好的可比性,说明集成序列有很好的代表性和一定的准确性。

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