DOI: 10.1002/jgrd.50619
论文题名: Climate controls on Andean precipitation δ18O interannual variability
作者: Insel N. ; Poulsen C.J. ; Sturm C. ; Ehlers T.A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 9721
结束页码: 9742
语种: 英语
英文关键词: central Andes
; regional modeling
; South America
; stable isotopes
Scopus关键词: Isotopes
; Vapors
; Central Andes
; General circulation model
; Interannual variability
; Oxygen isotopic composition
; Regional model
; Sea surface temperature (SST)
; South America
; Stable isotopes
; Atmospheric movements
; annual variation
; isotopic composition
; oxygen isotope
; paleoclimate
; precipitation (climatology)
; proxy climate record
; Quaternary
; sea surface temperature
; spatial variation
; stable isotope
; Andes
; Bolivia
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: The stable oxygen isotopic composition of precipitation (δ18Op ) is used as a proxy for modern and past atmospheric, biologic, and surface processes. Although the physical processes that fractionate 18O in vapor are known, regional controls of δ18Op are not well understood. Here we present results from a limited-domain general circulation model (REMOiso) to quantify regional controls on modern (1976-1999) interannual and spatial variations of δ18Op across four Andean domains spanning 50° latitude. Results are compared to observed δ18Op from meteorological stations. Simulated annual amount-weighted mean δ18Op ranges between -4 and -7‰ (0-5°S), -8 and -20‰ (14°S-26°S), -4 and -8.5‰ (30°S-35°S), and -7 to -10‰ (45°S-50°S). Relationships between climate and δ18Op on interannual timescale vary along the Andes and are tied to changes in precipitation and large-scale dynamics. In the northern Andes, interannual variations in δ18Op are mainly associated with precipitation amounts driven by low-latitude sea surface temperature and Amazon Basin conditions. In the north central Andes, δ18Op correlates with precipitation amount and wind trajectory, which is related to the position of the Bolivian High. In the south central Andes, δ18Op variability is mainly influenced by precipitation amounts that are controlled by the position and strength of the westerlies. In the southern Andes, interannual δ18Op variability is linked to the intensification and weakening of the South Pacific High. The regional climate- δ18Op relationships are discussed in the context of pre-Quaternary sedimentary δ18O proxy records. Key Points Simulated annual amount-weighted mean d18O vary significantly along the AndesPrecipitation d18O is influenced by large-scale processes varying across regionsVapor trajectories are the dominant control on d18O in the central Andes ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 0738822
; 0907817
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63339
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, University of Tuebingen, Ann Arbor, MI, United States; Department of the Geophysical Sciences, University of Chicago, HGS Bldg, 5734 South Ellis Ave., Chicago, IL 60637, United States; Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden; Department of Geosciences, Universität Tübingen, Tübingen, Germany
Recommended Citation:
Insel N.,Poulsen C.J.,Sturm C.,et al. Climate controls on Andean precipitation δ18O interannual variability[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)