ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region

doi:10.1016/j.epsl.2017.06.035

	ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region
	Cai, ZY (Cai, Zhongyin)1,2,4; Tian, LD (Tian, Lide)1,3,5,6; Bowen, GJ (Bowen, Gabriel J.)2; Tian, LD
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2017
卷号	475 期号:0 页码:25-33
关键词	Tibetan Plateau Stable-isotopes Interannual Variations Water Isotopes Ice Cores Delta-o-18 Convection Climatology Records System
DOI	10.1016/j.epsl.2017.06.035
文献子类	Article
英文摘要	Oxygen isotope signals (delta O-18) from paleo-archives are important proxies for past Asian Summer Monsoon (ASM) climate reconstruction. However, causes of interannual variation in the. delta O-18 values of modern precipitation across the ASM region remain in argument. We report interannual delta O-18 variation in southern Tibetan Plateau precipitation based on long-term observations at Lhasa. These data, together with precipitation delta O-18 records from five Global Network of Isotopes in Precipitation (GNIP) stations and two ice core delta O-18 records, were used to define a regional metric of ASM precipitation delta O-18 (ASMOI). Back-trajectory analyses for rainy season precipitation events indicate that moisture sources vary little between years with relatively high and low delta O-18 values, a result that is consistent for the south (Lhasa), southeast (Bangkok), and east ASM regions (Hong Kong). In contrast, delta O-18 values at these three locations are significantly correlated with convection in the estimated source regions and along transport paths. These results suggest that upstream convection, rather than moisture source change, causes interannual variation in ASM precipitation delta O-18 values. Contrasting values of the ASMOI in El Nino and La Nina years reveal a positive isotope-El Nino Southern Oscillation (ENSO) response (e.g., high values corresponding to warm phases), which we interpret as a response, to changes in regional convection. We show that the isotope-ENSO response is amplified at high elevation sites and during La Nifia years. These findings should improve interpretations of paleo-delta O-18 data as a proxy for past ASM variation and provide new opportunities to use data from this region to study paleo-ENSO activity. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	自然地理学
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000411167800003
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7981]
专题	青藏高原研究所_图书馆
通讯作者	Tian, LD
作者单位	1.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China. 2.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA. 3.Yunnan Univ, Inst Int Rivers & Ecosecur, Kunming 650091, Yunnan, Peoples R China. 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China. 5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China. 6.Univ Chinese Acad Sci, Coll Resource & Environm, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Cai, ZY ,Tian, LD ,Bowen, GJ ,et al. ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,475(0):25-33.
APA	Cai, ZY ,Tian, LD ,Bowen, GJ ,&Tian, LD.(2017).ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region.EARTH AND PLANETARY SCIENCE LETTERS,475(0),25-33.
MLA	Cai, ZY ,et al."ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region".EARTH AND PLANETARY SCIENCE LETTERS 475.0(2017):25-33.