Regional drought shifts (1710–2010) in East Central Asia and linkages with atmospheric circulation recorded in tree-ring δ18O

Guobao Xu, Xiaohong Liu, Valerie M Trouet, Kerstin Treydte, Guoju Wu, Tuo Chen, Weizhen Sun, Wenling An, Wenzhi Wang, Xiaomin Zeng, Dahe Qin

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Drought occurrence and duration in central Asia are of important socioeconomic, ecological, and geophysical significance and have received increasing research attention in recent years. Understanding long-term drought trends and their driving forces require reliable records of past drought variability with broad spatial representativeness. Here, we compiled four tree-ring δ18O records from eastern central Asia (ECA) and composited them into a drought-sensitive proxy to explore regional ECA moisture variations over the past 301 years (1710–2010 CE). A robust regional standardized precipitation-evapotranspiration index (SPEI) reconstruction was established based on the tree-ring cellulose δ18O fractionation mechanism and statistically significant proxy-climate relationships. We identified prominent droughts in 1710–1770, 1810–1830, and the beginning of the twenty-first century, and a regime shift to a persistently wet period from the 1880s to 2000. Our reconstruction reveals the impact of drought and pluvial patterns on the decline of Zhungar Empire, and on historical agricultural and socio-economical activities, including increased migration into ECA during the 1770–1800 pluvial. Our findings also suggest that wet conditions in the twentieth century in ECA were related to a strengthening of the westerly circulation and thus shed light on large-scale atmospheric circulation dynamics in central Asia.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalClimate Dynamics
DOIs
StateAccepted/In press - Apr 21 2018

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Keywords

  • Drought reconstruction
  • Eastern Central Asia
  • SPEI
  • Stable oxygen isotopes
  • Tree rings

ASJC Scopus subject areas

  • Atmospheric Science

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