Millennium-Long Tree-Ring Chronology Reveals Megadroughts on the Southeastern Tibetan Plateau

Millennium-Long Tree-Ring Chronology Reveals Megadroughts on the Southeastern Tibetan Plateau
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千年树木年轮揭示青藏高原东南部特大干旱

DOI:
10.3959/1536-1098-73.1.1
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发表时间:
2017-03
期刊:
影响因子:
1.6
通讯作者:
Lixin Lyu
Lixin Lyu
中科院分区:
农林科学4区
文献类型:
--
作者:
Changyuan Nie;Qi-Bin Zhang;Lixin Lyu

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千年古树在天然林中十分罕见。在这里,我们提出了一个长达1184年的树木年轮宽度年表生活在西藏高原东南部的比如地区的圆柏。生长-气候响应分析表明,Biru年表与晚春(5 - 6月)标准化降水蒸发指数(SPEI)呈显著正相关(r = 0.67,n = 53,p < 0.01)。树轮年表解释了1957-2010年期间SPEI总方差的44.5%。重建5月至6月的SPEI表明,在13世纪末至15世纪末,有一个长达两个世纪的大变革,在公元1630年代至1690年代,有一个长达七十年的大变革。与该地区其他湿度记录的比较表明,在我们的重建中确定的两个世纪的megadbrought可能是一个普遍的现象,最有可能反映了一个阶段的减少西南亚夏季风。我们的研究结果提供了新的证据,在过去的千年在青藏高原的megadbrought事件。
ABSTRACT Millennium-aged trees are rare in natural forests. Here we present an 1184-year-long tree-ring width chronology from living juniper trees in the Biru area on the southeastern Tibetan Plateau. Growth-climate response analysis shows that the Biru chronology is significantly and positively correlated with late-spring (May-June) Standardized Precipitation Evaporation Index (SPEI) (r = 0.67, n = 53, p < 0.01). The tree-ring chronology explains 44.5% of the total variance of SPEI during the period AD 1957–2010. Reconstruction of May-June SPEI shows that there was a two-century-long megadrought during the late 13th to late 15th Centuries, and a seven-decade-long megadrought during AD 1630s to 1690s. Comparisons with other moisture records in the region suggest that the two-century megadrought identified in our reconstruction might be a widespread phenomenon most likely reflecting a stage of reduced Southwest Asian Summer Monsoon. Our results provide new evidence on the megadrought events on the Tibetan Plateau for the last millennium.
DOI: 10.1007/s00382-004-0473-2
发表时间: 2004-11
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发表时间: 1978-02
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