DOI: 10.1002/2017JD027539
Scopus记录号: 2-s2.0-85045271576
论文题名: A 400-Year Ice Core Melt Layer Record of Summertime Warming in the Alaska Range
作者: Winski D. ; Osterberg E. ; Kreutz K. ; Wake C. ; Ferris D. ; Campbell S. ; Baum M. ; Bailey A. ; Birkel S. ; Introne D. ; Handley M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 7 起始页码: 3594
结束页码: 3611
语种: 英语
英文关键词: Alaska
; ice core
; melt layer
; paleoclimate
; temperature
Scopus关键词: glacier mass balance
; ice core
; paleoclimate
; paleotemperature
; proxy climate record
; Rossby wave
; summer
; Alaska
; Alaska Range
; Denali National Park
; Pacific Ocean
; Pacific Ocean (Tropical)
; United States
英文摘要: Warming in high-elevation regions has societally important impacts on glacier mass balance, water resources, and sensitive alpine ecosystems, yet very few high-elevation temperature records exist from the middle or high latitudes. While a variety of paleoproxy records provide critical temperature records from low elevations over recent centuries, melt layers preserved in alpine glaciers present an opportunity to develop calibrated, annually resolved temperature records from high elevations. Here we present a 400-year temperature proxy record based on the melt layer stratigraphy of two ice cores collected from Mt. Hunter in Denali National Park in the central Alaska Range. The ice core record shows a sixtyfold increase in water equivalent total annual melt between the preindustrial period (before 1850 Common Era) and present day. We calibrate the melt record to summer temperatures based on weather station data from the ice core drill site and find that the increase in melt production represents a summer warming rate of at least 1.92 ± 0.31°C per century during the last 100 years, exceeding rates of temperature increase at most low-elevation sites in Alaska. The Mt. Hunter melt layer record is significantly (p < 0.05) correlated with surface temperatures in the central tropical Pacific through a Rossby wave-like pattern that enhances high temperatures over Alaska. Our results show that rapid alpine warming has taken place in the Alaska Range for at least a century and that conditions in the tropical oceans contribute to this warming. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114093
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Climate Change Institute and School of Earth and Climate Sciences, University of Maine, Orono, ME, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States
Recommended Citation:
Winski D.,Osterberg E.,Kreutz K.,et al. A 400-Year Ice Core Melt Layer Record of Summertime Warming in the Alaska Range[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(7)