DOI: 10.1007/s00382-012-1548-0
Scopus记录号: 2-s2.0-84879554353
论文题名: Winter precipitation isotope slopes of the contiguous USA and their relationship to the Pacific/North American (PNA) pattern
作者: Liu Z. ; Bowen G.J. ; Welker J.M. ; Yoshimura K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2 起始页码: 403
结束页码: 420
语种: 英语
英文关键词: Atmospheric circulation
; Pacific/North American
; Precipitation isotope slope
英文摘要: This study compares the synoptic-dynamic relationship between two phases of the Pacific/North American (PNA) pattern and winter precipitation isotopes at 73 sites across the contiguous USA. We use the spatial pattern of isotope slope-the rate of changes in precipitation isotope ratios with distance-to identify features in the seasonal precipitation isotope fields related to climatic patterns, PNA positive and PNA negative. Our results show relationships between zones of high isotope slopes and the spatial position of the polar jet stream and juxtaposition of air masses associated with the PNA pattern. During a positive PNA winter, zones of high isotope slope in the eastern USA shift southward. This change is coincident with a southward displacement of the polar jet stream in this region, which leads to a greater frequency of polar air masses and 18O-depleted isotope values of precipitation in the region. In the western USA, zones of high slope shift eastward during the positive PNA winter, associated with more frequent penetration of tropical air masses that bring 18O-enriched precipitation to the region. Differences in δ18O/temperature relationships between the PNA-positive and -negative winters and contrasting δ18O/temperature behaviors in the eastern and western USA provide support for the role of variation in moisture source and transport as a control on the isotopic patterns. These findings highlight the importance of synoptic climate driven by PNA pattern in determining the spatial patterns of precipitation isotopes and provide constraints on paleo-water isotope interpretation and modern isotope hydrological processes. © 2012 Springer-Verlag Berlin Heidelberg. 资助项目: NSFC, National Natural Science Foundation of China
; DBI, Division of Biological Infrastructure
; DBI, Division of Biological Infrastructure
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54860
Appears in Collections: 过去全球变化的重建
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作者单位: Tianjin Key Laboratory of Water Resource and Environment, Tianjin Normal University, Tianjin, China; Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN, United States; Environment and Natural Resources Institute, University of Alaska Anchorage, Anchorage, AK, United States; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Liu Z.,Bowen G.J.,Welker J.M.,et al. Winter precipitation isotope slopes of the contiguous USA and their relationship to the Pacific/North American (PNA) pattern[J]. Climate Dynamics,2013-01-01,41(2)