DOI: 10.1016/j.gloplacha.2015.12.021
论文题名: Lake oxygen isotopes as recorders of North American Rocky Mountain hydroclimate: Holocene patterns and variability at multi-decadal to millennial time scales
作者: Anderson L. ; Berkelhammer M. ; Barron J.A. ; Steinman B.A. ; Finney B.P. ; Abbott M.B.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 137 起始页码: 131
结束页码: 148
语种: 英语
英文关键词: Climate forcing
; Holocene
; Lake water isotopes
; Ocean-atmosphere
; Paleoclimate
; Western North America
Scopus关键词: Calcium carbonate
; Evaporation
; Isotopes
; Lakes
; Sediments
; Climate forcings
; Holocenes
; Lake waters
; Ocean atmosphere
; Paleoclimates
; Western North America
; Oceanography
; atmosphere-ocean system
; atmospheric forcing
; calcium carbonate
; climate forcing
; comparative study
; deuterium
; evaporation
; lacustrine deposit
; lake water
; Little Ice Age
; Medieval Warm Period
; oxygen isotope
; Pacific Decadal Oscillation
; paleoclimate
; precipitation (climatology)
; sensitivity analysis
; Canada
; Jellybean Lake
; North American Cordillera
; Pacific Ocean
; Pacific Ocean (North)
; Rocky Mountains
; Yukon Territory
; Bison
英文摘要: Lake sediment oxygen isotope records (calcium carbonate-δ18O) in the western North American Cordillera developed during the past decade provide substantial evidence of Pacific ocean-atmosphere forcing of hydroclimatic variability during the Holocene. Here we present an overview of 18 lake sediment δ18O records along with a new compilation of lake water δ18O and δ2H that are used to characterize lake sediment sensitivity to precipitation-δ18O in contrast to fractionation by evaporation. Of the 18 records, 14 have substantial sensitivity to evaporation. Two records reflect precipitation-δ18O since the middle Holocene, Jellybean and Bison Lakes, and are geographically positioned in the northern and southern regions of the study area. Their comparative analysis indicates a sequence of time-varying north-south precipitation-δ18O patterns that is evidence for a highly non-stationary influence by Pacific ocean-atmosphere processes on the hydroclimate of western North America. These observations are discussed within the context of previous research on North Pacific precipitation-δ18O based on empirical and modeling methods. The Jellybean and Bison Lake records indicate that a prominent precipitation-δ18O dipole (enriched-north and depleted-south) was sustained between ~3.5 and 1.5ka, which contrasts with earlier Holocene patterns, and appears to indicate the onset of a dominant tropical control on North Pacific ocean-atmosphere dynamics. This remains the state of the system today. Higher frequency reversals of the north-south precipitation-δ18O dipole between ~2.5 and 1.5ka, and during the Medieval Climate Anomaly and the Little Ice Age, also suggest more varieties of Pacific ocean-atmosphere modes than a single Pacific Decadal Oscillation (PDO) type analogue. Results indicate that further investigation of precipitation-δ18O patterns on short (observational) and long (Holocene) time scales is needed to improve our understanding of the processes that drive regional precipitation-δ18O responses to Pacific ocean-atmosphere variability, which in turn, will lead to a better understanding of internal Pacific ocean-atmosphere variability and its response to external climate forcing mechanisms. © 2015. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961338018&doi=10.1016%2fj.gloplacha.2015.12.021&partnerID=40&md5=8c66f619f2f2c52bc247553ed9786c2e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11710
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: U.S. Geological Survey Geosciences and Environmental Change Science Center, Denver, CO, United States
Recommended Citation:
Anderson L.,Berkelhammer M.,Barron J.A.,et al. Lake oxygen isotopes as recorders of North American Rocky Mountain hydroclimate: Holocene patterns and variability at multi-decadal to millennial time scales[J]. Global and Planetary Change,2016-01-01,137.