DOI: 10.1002/jgrd.50362
论文题名: An observed negative trend in West Antarctic accumulation rates from 1975 to 2010: Evidence from new observed and simulated records
作者: Burgener L. ; Rupper S. ; Koenig L. ; Forster R. ; Christensen W.F. ; Williams J. ; Koutnik M. ; Miège C. ; Steig E.J. ; Tingey D. ; Keeler D. ; Riley L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4205
结束页码: 4216
语种: 英语
英文关键词: accumulation rate
; firn core
; SAM
; Southern Annular Mode
; West Antarctica
Scopus关键词: Atmospheric temperature
; Snow
; Accumulation rates
; firn core
; SAM
; Southern Annular Mode
; West antarctica
; Computer simulation
; atmospheric dynamics
; data set
; firn
; ice core
; ice sheet
; latitude
; sea surface temperature
; snow accumulation
; Amundsen Sea
; Antarctica
; Southern Ocean
; West Antarctic Ice Sheet
; West Antarctica
英文摘要: Observations of snow accumulation rates from five new firn cores show a negative trend that is statistically significant over the past several decades across the central West Antarctic ice sheet (WAIS). A negative temporal trend in accumulation rates is unexpected in light of rising surface temperatures as well as model simulations predicting higher accumulation rates for the region. Both the magnitude of the mean accumulation rates and the range of interannual variability observed in the new records compare favorably to older records collected from a broad area of the WAIS, suggesting that the new data may serve as a regional proxy for recent temporal trends in West Antarctic accumulation rates. The observed negative trend in accumulation is likely the result of a shift in low-pressure systems over the Amundsen Sea region, dominated by changes in the austral fall season. Regional-scale climate models and reanalysis data do not capture the negative trend in accumulation rate observed in these firn cores. Nevertheless the models and reanalyses agree well in both accumulation-rate means and interannual variability, with no single model or dataset standing out as significantly more skilled at capturing the observed magnitude of and trend in accumulation rates in this region of the WAIS. Key Points Significant negative accumulation trends from new West Antarctic firn coresTropical and high latitude atmospheric dynamics affect snow precipitationSuite of model and reanalysis do not capture negative accumulation trend ©2013. 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/63746
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geological Sciences, Brigham Young University, S389 ESC, Provo, UT 84602, United States; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt MD, United States; University of Utah, Department of Geography, Salt Lake City UT, United States; Center for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Department of Earth and Space Sciences, University of Washington, Seattle WA, United States
Recommended Citation:
Burgener L.,Rupper S.,Koenig L.,et al. An observed negative trend in West Antarctic accumulation rates from 1975 to 2010: Evidence from new observed and simulated records[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)