DOI: 10.1175/JCLI-D-15-0166.1
Scopus记录号: 2-s2.0-84947736891
论文题名: Characterization of the simulated regional snow albedo feedback using a regional climate model over complex terrain
作者: Letcher T.W. ; Minder J.R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 19 起始页码: 7576
结束页码: 7595
语种: 英语
Scopus关键词: Atmospheric movements
; Budget control
; Climate models
; Feedback
; Global warming
; Landforms
; Snow
; Solar radiation
; Albedo
; Atmosphere-land interactions
; Horizontal grid spacing
; Mesoscale process
; Regional climate changes
; Regional climate model simulation
; Regional climate modeling
; Snow covers
; Climate change
; albedo
; atmosphere-biosphere interaction
; climate change
; climate modeling
; complex terrain
; mesoscale meteorology
; regional climate
; snow cover
; thermodynamics
; Colorado
; United States
英文摘要: Midlatitude mountain regions are particularly sensitive to climate change because of an active snow albedo feedback (SAF). Here, the SAF is characterized and quantified over the complex terrain of the Colorado Headwaters region using high-resolution regional climate model simulations. A pair of 7-yr control and pseudo-global warming simulations is used to study the regional climate response to a large-scale thermodynamic climate perturbation. Warming is strongly enhanced in regions of snow loss by as much as 5°C. Linear feedback analysis is used to quantify the strength of the SAF within the Headwaters region. The strength of the SAF reaches a maximum value of 4Wm-2K-1 during April when snow loss coincides with strong incoming solar radiation. Simulations using 4- and 12-km horizontal grid spacing show good agreement in the strength and timing of the SAF, whereas a 36-km simulation shows discrepancies that are tied to differences in snow accumulation and ablation caused by smoother terrain. Energy budget analysis shows that transport by atmospheric circulations acts as a negative feedback to regional warming, damping the effects of the SAF. On the mesoscale, the SAF nonlocally enhances warming in locations with no snow, and enhances snowmelt in locations that do not experience snow cover change. The methods presented here can be used generally to quantify the role of the SAF in simulated regional climate change, illuminating the causes of differences in climate warming between models and regions. © 2015 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50681
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, 1400 Washington Ave., Albany, NY, United States
Recommended Citation:
Letcher T.W.,Minder J.R.. Characterization of the simulated regional snow albedo feedback using a regional climate model over complex terrain[J]. Journal of Climate,2015-01-01,28(19)