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Drought variation of western Chinese Loess Plateau since 1568 and its linkages with droughts in western North America

Journal article
Authors Keyan Fang
Zhengtang Guo
Deliang Chen
Hans W. Linderholm
Jinbao Li
Feifei Zhou
Guoyang Guo
Zhipeng Dong
Yingjun Li
Published in Climate Dynamics
Volume 49
Issue 11-12
Pages 3839-3850
ISSN 09307575
Publication year 2017
Published at Department of Earth Sciences
Pages 3839-3850
Language en
Links dx.doi.org/10.1007/s00382-017-3545-...
Keywords Drought, Multi-decadal timescale, Tree ring, Western Chinese Loess Plateau, Western North America
Subject categories Climate Research

Abstract

© 2017, Springer-Verlag Berlin Heidelberg. Understanding long-term drought variations in the past can help to evaluate ongoing and future hydroclimate change in the arid western Chinese Loess Plateau (WCLP), a region with increasing demand for water resources due to the increasing population and socioeconomic activities. Here we present a new tree-ring chronology inform the WCLP, which shows coherent interannual variations with tree-ring chronologies from 7 neighboring areas across the WCLP, suggesting a common regional climate control over tree growth. However, considerable differences are observed among their interdecadal variations, which are likely due to growth disturbances at interdecadal timescales. To deal with this issue, we use a frequency based method to develop a composite tree-ring chronology from 401 tree-ring series from these 8 sites, which shows more pronounced interdecadal variability than a chronology developed using traditional methods. The composite tree-ring chronology is used to reconstruct the annual precipitation from previous August to current July from 1568 to 2012, extending about 50 years longer than the previous longest tree-ring reconstruction from the region. The driest epoch of our reconstruction is found in the 1920s–1930s, which matches well with droughts recorded in historical documents. Over the past four centuries, a strong resemblance between drought variability in the WCLP and western North America (WNA) is evident on multidecadal timescales, but this relationship breaks down on timescales shorter than about 50 years.

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