Increased drought events in southwest China revealed by tree ring oxygen isotopes and potential role of Indian Ocean Dipole

doi:10.1016/j.scitotenv.2019.01.186

IVPP-IR

	Increased drought events in southwest China revealed by tree ring oxygen isotopes and potential role of Indian Ocean Dipole
	Xu, Chenxi 1,2; An, Wenling 1,2; Wang, S. -Y. Simon 3; Yi, Liang 4; Ge, Junyi 2,5,8; Nakatsuka, Takeshi 6; Sano, Masaki 6,7; Guo, Zhengtang 1,2,8
	2019-04-15
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	661 页码:645-653
通讯作者	Xu, Chenxi([email protected])
摘要	The highlands in southwestern China experience pronounced fluctuations in the hydroclimate with profound impacts on agriculture and economics. To investigate the drought history of this region beyond instrumental records, a tree ring cellulose oxygen isotope (delta O-18(c)) chronology was developed for the period 1733-2013 using samples collected from six Larix trees in the low-latitude highlands (LLH) of southwestern China. The analysis revealed that delta O-18(c) is significantly correlated with the rainy season (May-October) precipitation and relative humidity, as well as drought severity. The delta O-18(c) chronology accounts for 46% of the observed variance in the rainy season precipitation and it was subsequently used to reconstruct precipitation. The reconstructed precipitation reveals an apparent drying trend since 1840, accompanied by increasingly frequent drought events since 1970. Interdecadal variability is also present, characterized with two distinct wet periods in 1740-1760 and 1800-1900 and two drier periods in 1760-1800 and 1900-2013. On the interannual timescale, the LLH precipitation was modulated collectively by the El Nino-Southern Oscillation (ENSO) and the Indian Ocean dipole (IOD). There appears to be an enhanced precipitation-IOD relationship since 1970 in response to the increase in positive-IOD events, implying an increasing likelihood of drought for the southwest China LLH. (C) 2019 Elsevier B.V. All rights reserved.
关键词	Precipitation Tree ring oxygen isotope Southwest China Indian Ocean Dipole
DOI	10.1016/j.scitotenv.2019.01.186
关键词[WOS]	SUMMER MONSOON ; DELTA-O-18 CHRONOLOGY ; TIME-SERIES ; PRECIPITATION ; RECONSTRUCTION ; VARIABILITY ; MOISTURE ; PLATEAU ; RIVER ; FREQUENCY
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of China[41672179] ; Natural Science Foundation of China[41672352] ; Natural Science Foundation of China[41630529] ; Natural Science Foundation of China[41430531] ; Natural Science Foundation of China[41690114] ; Natural Science Foundation of China[41888101] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26020000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA13010106] ; Chinese Academy of Sciences (CAS) Pioneer Hundred Talents Program ; National Key R&D Program of China[2016YFA0600502] ; National Key R&D Program of China[2017YFE0112800]
项目资助者	Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Chinese Academy of Sciences (CAS) Pioneer Hundred Talents Program ; National Key R&D Program of China
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000458408200059
出版者	ELSEVIER SCIENCE BV
引用统计	被引频次：37[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/9388
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Xu, Chenxi
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China 3.Utah State Univ, Dept Plants Soils & Climate, Logan, UT 84322 USA 4.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China 5.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China 6.Res Inst Humanity & Nat, Kita Ku, Kyoto, Japan 7.Waseda Univ, Fac Human Sci, 2-579-15 Mikajima, Tokorozawa, Saitama 3591192, Japan 8.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Xu, Chenxi,An, Wenling,Wang, S. -Y. Simon,et al. Increased drought events in southwest China revealed by tree ring oxygen isotopes and potential role of Indian Ocean Dipole[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,661:645-653.
APA	Xu, Chenxi.,An, Wenling.,Wang, S. -Y. Simon.,Yi, Liang.,Ge, Junyi.,...&Guo, Zhengtang.(2019).Increased drought events in southwest China revealed by tree ring oxygen isotopes and potential role of Indian Ocean Dipole.SCIENCE OF THE TOTAL ENVIRONMENT,661,645-653.
MLA	Xu, Chenxi,et al."Increased drought events in southwest China revealed by tree ring oxygen isotopes and potential role of Indian Ocean Dipole".SCIENCE OF THE TOTAL ENVIRONMENT 661(2019):645-653.