DOI: 10.1016/j.quascirev.2015.07.030
Scopus记录号: 2-s2.0-84949657633
论文题名: McCall Glacier record of Arctic climate change: Interpreting a northern Alaska ice core with regional water isotopes
作者: Klein E.S. ; Nolan M. ; McConnell J. ; Sigl M. ; Cherry J. ; Young J. ; Welker J.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 131 起始页码: 274
结束页码: 284
语种: 英语
英文关键词: Aleutian Low
; Arctic Alaska
; Ice core
; McCall Glacier
; North Pacific index
; Paleoclimate reconstruction
; Paleothermometer
; Precipitation moisture source
; Sea ice
; Water isotopes
Scopus关键词: Climate change
; Climatology
; Isotopes
; Moisture
; Repair
; Sea ice
; Aleutian low
; Arctic Alaska
; Ice core
; Moisture sources
; North Pacific
; Paleoclimate reconstruction
; Paleothermometer
; Water isotope
; Ice
; atmospheric moisture
; climate oscillation
; climate variation
; GRIP
; ice core
; isotopic composition
; isotopic ratio
; paleoclimate
; proxy climate record
; reconstruction
; sea ice
; Alaska
; Brooks Range
; McCall Glacier
; United States
英文摘要: We explored modern precipitation and ice core isotope ratios to better understand both modern and paleo climate in the Arctic. Paleoclimate reconstructions require an understanding of how modern synoptic climate influences proxies used in those reconstructions, such as water isotopes. Therefore we measured periodic precipitation samples at Toolik Lake Field Station (Toolik) in the northern foothills of the Brooks Range in the Alaskan Arctic to determine δ18O and δ2H. We applied this multi-decadal local precipitation δ18O/temperature regression to ~65 years of McCall Glacier (also in the Brooks Range) ice core isotope measurements and found an increase in reconstructed temperatures over the late-20th and early-21st centuries. We also show that the McCall Glacier δ18O isotope record is negatively correlated with the winter bidecadal North Pacific Index (NPI) climate oscillation. McCall Glacier deuterium excess (d-excess, δ2H - 8*δ18O) values display a bidecadal periodicity coherent with the NPI and suggest shifts from more southwestern Bering Sea moisture sources with less sea ice (lower d-excess values) to more northern Arctic Ocean moisture sources with more sea ice (higher d-excess values). Northern ice covered Arctic Ocean McCall Glacier moisture sources are associated with weak Aleutian Low (AL) circulation patterns and the southern moisture sources with strong AL patterns. Ice core d-excess values significantly decrease over the record, coincident with warmer temperatures and a significant reduction in Alaska sea ice concentration, which suggests that ice free northern ocean waters are increasingly serving as terrestrial precipitation moisture sources; a concept recently proposed by modeling studies and also present in Greenland ice core d-excess values during previous transitions to warm periods. This study also shows the efficacy and importance of using ice cores from Arctic valley glaciers in paleoclimate reconstructions. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59716
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Biological Sciences, University of Alaska Anchorage, 3101 Science Circle, Anchorage, AK, United States; Institute of Northern Engineering, University of Alaska Fairbanks, 306 Tanana Loop, Fairbanks, AK, United States; Desert Research Institute, University of Nevada Reno, 2215 Raggio Parkway, Reno, NV, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Klein E.S.,Nolan M.,McConnell J.,et al. McCall Glacier record of Arctic climate change: Interpreting a northern Alaska ice core with regional water isotopes[J]. Quaternary Science Reviews,2016-01-01,131