DOI: 10.1175/JCLI-D-13-00334.1
Scopus记录号: 2-s2.0-84893191237
论文题名: Pacific-North American teleconnection controls on precipitation isotopes (δ18O) across the Contiguous United States and Adjacent Regions: A GCM-based analysis
作者: Liu Z. ; Yoshmura K. ; Bowen G.J. ; Welker J.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 3 起始页码: 1046
结束页码: 1061
语种: 英语
Scopus关键词: Antiphase oscillations
; Atmospheric circulation
; Atmospheric general circulation models
; Interannual variability
; Northern Rocky Mountains
; Northwestern United States
; Paleoclimate records
; Teleconnection patterns
; Climate models
; Climatology
; Isotopes
; atmospheric general circulation model
; climatology
; computer simulation
; moisture flux
; numerical model
; paleoclimate
; precipitation assessment
; teleconnection
; winter
; Great Lakes [North America]
; Pacific Ocean
; Pacific Ocean (North)
; Rocky Mountains
; United States
英文摘要: The Pacific-North American (PNA) teleconnection pattern has a strong influence on North America's winter climate, but much less is known about how the PNA pattern controls precipitation isotopes (e.g., δ18O) across the United States. In this study, an isotopically equipped atmospheric general circulation model (isoGSM) is used to investigate how divergent phases of the PNA affect precipitation δ18O values across the United States. A simulation using observational climate and isotope data over the United States is evaluated first. The simulation explains 84%of the spatial variability of winter precipitation δ18O, with an overestimation in the northern Rocky Mountains and the Great Lakes. Temporally, the simulation explains 29%-81% of the interannual variability of winter precipitation δ18O, with typically a higher explained variance in the east than the west. The modeled winter precipitation δ18O exhibits a clear northwest-southeast (NW-SE) dipolelike pattern in response to shifts in the PNA pattern, with the center of positive polarity in the northwestern United States and the Canadian prairies and the center of negative polarity over the Ohio River valley. This dipolelike spatial pattern is a result of the difference in atmospheric circulation and moisture sources associated with the PNA pattern. These results highlight the importance of the PNA-associated circulation dynamics in governing precipitation isotope patterns across the United States. This understanding improves our ability to interpret paleoclimate records of water isotope/hydrologic change across the United States with a much greater appreciation of regional traits. The robust antiphase oscillation in precipitation isotopes in response to shifting the PNA pattern provides a promising opportunity to reconstruct the past variability in the PNA pattern that may be recorded in ice cores, tree rings, lake sediments, and speleothems. © 2014 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; NSF, National Science Foundation
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50959
Appears in Collections: 气候变化事实与影响
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作者单位: Tianjin Key Laboratory of Water Resource and Environment, Tianjin Normal University, Tianjin, China; Atmosphere and Ocean Research Institute, University of Tokyo, Chiba, Japan; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States
Recommended Citation:
Liu Z.,Yoshmura K.,Bowen G.J.,et al. Pacific-North American teleconnection controls on precipitation isotopes (δ18O) across the Contiguous United States and Adjacent Regions: A GCM-based analysis[J]. Journal of Climate,2014-01-01,27(3)