DOI: 10.1175/JCLI-D-11-00389.1
Scopus记录号: 2-s2.0-84867676812
论文题名: Eclipse ice core accumulation and stable isotope variability as an indicator of North Pacific climate
作者: Kelsey E.P. ; Wake C.P. ; Yalcin K. ; Kreutz K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 18 起始页码: 6426
结束页码: 6440
语种: 英语
Scopus关键词: Climate variability
; North Pacific Ocean
; Pacific decadal oscillation
; Pacific-North American pattern/oscillation
; Paleoclimates
; Teleconnections
; Climate change
; Isotopes
; atmospheric circulation
; climate change
; ice core
; Pacific Decadal Oscillation
; paleoclimate
; sea surface temperature
; stable isotope
; teleconnection
; Canada
; Eclipse Icefield
; Pacific Ocean
; Pacific Ocean (North)
; Saint Elias Mountains
; Yukon Territory
英文摘要: The high accumulation rate and negligible amount ofmelt atEclipse Icefield (3017 m) in the Saint EliasRange of Yukon, Canada, allows for the preservation of a high-resolution isotopic and glaciochemical records valuable for reconstruction of climatic variables. Each of the three Eclipse ice cores have a well-constrained depth-age scale with dozens of reference horizons over the twentieth century that permits an exceptional level of confidence in the results of the current calibration exercise. Stacked time series of accumulation and stable isotopes were divided into cold and warmseasons and seasons of extreme high and extreme low accumulation and stable isotope values (eight groups). For each group, season-averaged composites of 500-hPa geopotential height grids, and the individual seasons that constitute them, were analyzed to elucidate common anomalous flow patterns. This analysis shows that the most fractionated isotopes and lowest accumulation cold seasons reflect a more zonal height pattern in the North Pacific associated with negative Pacific-North American (PNA) and Pacific decadal oscillation (PDO) indices. Conversely, the least fractionated isotopes and highest accumulation cold seasons are associated with a positive PNA pattern. Although only a maximum of approximately 20% of the total number of accumulation and stable isotope seasons exhibit a relatively consistent relationship with 500-hPa geopotential height patterns, these results support the hypothesis that the most extreme accumulation and extreme isotope cold-season values in the Saint Elias Mountains are related to consistent atmospheric circulation and oceanic sea surface temperature patterns. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52262
Appears in Collections: 气候变化事实与影响
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作者单位: Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Department of Geosciences, Oregon State University, Corvallis, OR, United States; Climate Change Institute, Department of Earth Sciences, University of Maine, Orono, ME, United States
Recommended Citation:
Kelsey E.P.,Wake C.P.,Yalcin K.,et al. Eclipse ice core accumulation and stable isotope variability as an indicator of North Pacific climate[J]. Journal of Climate,2012-01-01,25(18)