DOI: 10.1002/jgrd.502492013
论文题名: Baffin Island snow extent sensitivity: Insights from a regional climate model
作者: Berdahl M. ; Robock A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 9 起始页码: 3506
结束页码: 3519
语种: 英语
Scopus关键词: Computer simulation
; Sea ice
; Snow
; Sun
; Volcanoes
; Canadian Arctic
; North Atlantic Ocean
; Regional climate models
; Relative impact
; Temperature cycles
; Temperature decrease
; Volcanic eruptions
; Weather research and forecasting models
; Weather forecasting
; climate modeling
; hydrological modeling
; ice cover
; Little Ice Age
; regional climate
; sensitivity analysis
; snow cover
; temperature effect
; volcanic eruption
; Atlantic Ocean
; Atlantic Ocean (North)
; Baffin Island
; Canada
; Canadian Arctic
; Nunavut
英文摘要: Recent modeling efforts suggest that the Little Ice Age (LIA) onset could be explained by a series of four large decadally-spaced volcanic eruptions. At that time, glaciers on Baffin Island advanced and did not retreat until the past century, perhaps due to Arctic and North Atlantic Ocean sea ice feedbacks. To try to determine what parameters sustain snow cover, we investigate the relative impacts of changes in radiation and advection on minimum summer snow extent over Baffin Island. We used the Weather Research and Forecasting (WRF) model to run eight 6month long (April-September), 10 km resolution simulations, in which we varied boundary condition temperatures, solar radiation, and sea ice cover. Although the Control Run underestimated cloud cover and thus produced an exaggerated diurnal 2m temperature cycle, the relative changes of snow extent show that WRF accurately simulates snow expansion into the same regions as during the LIA. With an average temperature decrease from current temperatures by 3.91.1 K, it only requires one season for the model to lower the snowline by comparable elevation changes seen during the descent into the LIA. WRF's maximum snow line sensitivity is 7 K/km, within the range of the typically assumed lapse rate of 5-7 K/km in the Canadian Arctic. Thus, if a shift in the Arctic climate greatly expanded sea ice coverage following large volcanic eruptions, this would have been enough to perpetuate an ice sheet on Baffin Island throughout the LIA. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1157525
; ARC-0908834
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63467
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 Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, NJ 08901, United States
Recommended Citation:
Berdahl M.,Robock A.. Baffin Island snow extent sensitivity: Insights from a regional climate model[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(9)