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

IF 1.1 4区农林科学 Q3 FORESTRY Tree-Ring Research Pub Date : 2017-03-06 DOI:10.3959/1536-1098-73.1.1

C. Nie, Qibin Zhang, Lixin Lyu

引用次数: 10

Abstract

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.

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千年长树年轮年表揭示青藏高原东南部特大干旱

摘要：千年树龄的树木在天然林中很少见。本文以青藏高原东南部比如地区现存的刺柏为材料，提出了一个1184年长的年轮宽度年表。生长气候响应分析表明，比鲁年表与晚春（5-6月）标准化降水蒸发指数（SPEI）显著正相关（r=0.67，n=53，p<0.01）。年轮年表解释了公元1957–2010年期间SPEI总方差的44.5%。对5月至6月SPEI的重建表明，在13世纪末至15世纪末发生了长达两个世纪的特大干旱，在公元1630年代至1690年代发生了长达70年的特大干旱。与该地区其他湿度记录的比较表明，在我们的重建中发现的两个世纪的特大干旱可能是一种普遍现象，很可能反映了西南亚夏季风减少的阶段。我们的研究结果为青藏高原上千年的特大干旱事件提供了新的证据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tree-Ring Research 农林科学-林学

CiteScore

2.40

自引率

12.50%

发文量

审稿时长

>36 weeks

期刊介绍： Tree-Ring Research (TRR) is devoted to papers dealing with the growth rings of trees and the applications of tree-ring research in a wide variety of fields, including but not limited to archaeology, geology, ecology, hydrology, climatology, forestry, and botany. Papers involving research results, new techniques of data acquisition or analysis, and regional or subject-oriented reviews or syntheses are considered for publication. Scientific papers usually fall into two main categories. Articles should not exceed 5000 words, or approximately 20 double-spaced typewritten pages, including tables, references, and an abstract of 200 words or fewer. All manuscripts submitted as Articles are reviewed by at least two referees. Research Reports, which are usually reviewed by at least one outside referee, should not exceed 1500 words or include more than two figures. Research Reports address technical developments, describe well-documented but preliminary research results, or present findings for which the Article format is not appropriate. Book or monograph Reviews of 500 words or less are also considered. Other categories of papers are occasionally published. All papers are published only in English. Abstracts of the Articles or Reports may be printed in other languages if supplied by the author(s) with English translations.