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DOI	10.1016/j.epsl.2017.06.035
	ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region
	Cai, Zhongyin; Tian, Lide; Bowen, Gabriel J.
通讯作者	Tian, LD (通讯作者)
发表日期	2017
ISSN	0012-821X
EISSN	1385-013X
起始页码	25
结束页码	33
卷号	475
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.
关键词	TIBETAN PLATEAU STABLE-ISOTOPES INTERANNUAL VARIATIONS WATER ISOTOPES DELTA-O-18 CONVECTION CLIMATOLOGY RECORDS SPACE
英文关键词	oxygen isotope; precipitation; moisture source; convection; Asian Summer Monsoon; El Niffo Southern Oscillation
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000411167800003
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259062
推荐引用方式 GB/T 7714	Cai, Zhongyin,Tian, Lide,Bowen, Gabriel J.. ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region[J]. 中国科学院青藏高原研究所,2017,475.
APA	Cai, Zhongyin,Tian, Lide,&Bowen, Gabriel J..(2017).ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region.EARTH AND PLANETARY SCIENCE LETTERS,475.
MLA	Cai, Zhongyin,et al."ENSO variability reflected in precipitation oxygen isotopes across the Asian Summer Monsoon region".EARTH AND PLANETARY SCIENCE LETTERS 475(2017).