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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
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
2017
Volume475Issue:0Pages:25-33
DOI10.1016/j.epsl.2017.06.035
AbstractOxygen 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.
Subject Area自然地理学
WOS IDWOS:000411167800003
Language英语
Indexed BySCI
KeywordTibetan Plateau Stable-isotopes Interannual Variations Water Isotopes Ice Cores Delta-o-18 Convection Climatology Records System
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics ; Geochemistry & Geophysics
Cooperation Status国际
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7981
Collection图书馆
Corresponding AuthorTian, LD
Affiliation1.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.
Recommended Citation
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.
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