DOI: 10.1175/JCLI-D-16-0071.1
Scopus记录号: 2-s2.0-85017512287
论文题名: Cloud-atmospheric boundary layer-surface interactions on the Greenland ice sheet during the July 2012 extreme melt event
作者: Solomon A. ; Shupe M.D. ; Miller N.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 9 起始页码: 3237
结束页码: 3252
语种: 英语
Scopus关键词: Atmospheric boundary layer
; Atmospheric thermodynamics
; Boundary layer flow
; Boundary layers
; Budget control
; Glaciers
; Arctic
; Cloud forcing
; Energy budget/balance
; Ice sheet
; Regional model
; Transport
; Ice
英文摘要: Regional model simulations of the 10-13 July 2012 extreme melt event over the Greenland Ice Sheet (GIS) are used to investigate how low-level liquid-bearing clouds impact surface energy fluxes, and therefore the energy available for melt. A sensitivity study in which the radiation code is modified so that cloud liquid and ice do not emit, absorb, or reflect radiation is used to identify cloud impacts beyond the cloud radiative effect. It is found that Arctic mixed-phase stratocumuli are not produced in the sensitivity experiment, highlighting that cloud radiative fluxes are required to maintain the clouds. A number of feedbacks are found that damp the warming effect of the clouds. Thin mixed-phase clouds increase the downward longwave fluxes by 100 W m-2, but upward daytime surface longwave fluxes increase by 20 W m-2 (60 W m-2 at night) and net shortwave fluxes decrease by 40 W m-2 (partially due to a 0.05 increase in surface albedo), leaving only 40 W m-2 available for melt. This 40 W m-2 is distributed between the turbulent and conductive ground fluxes, so it is only at times of weak turbulent fluxes (i.e., at night or during melt) that this energy goes into the conductive ground flux, providing energy for melt. From these results it is concluded that it is the integrated impact of the clouds over the diurnal cycle (the preconditioning of the snowpack by the clouds at night) that made melt possible during this 3-day period. These findings are extended to understand the pattern of melt observed over the GIS. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49679
Appears in Collections: 气候变化事实与影响
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作者单位: Cooperative Institute for Research in Environmental Science, University of Colorado Boulder, Boulder, CO, United States; NOAA/Earth System Research Laboratory Physical Sciences Division, Boulder, CO, United States
Recommended Citation:
Solomon A.,Shupe M.D.,Miller N.B.. Cloud-atmospheric boundary layer-surface interactions on the Greenland ice sheet during the July 2012 extreme melt event[J]. Journal of Climate,2017-01-01,30(9)