DOI: 10.5194/tc-15-3459-2021
论文题名: Energetics of surface melt in West Antarctica
作者: Ghiz M.L. ; Scott R.C. ; Vogelmann A.M. ; Lenaerts J.T.M. ; Lazzara M. ; Lubin D.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 7 起始页码: 3459
结束页码: 3494
语种: 英语
英文关键词: energy balance
; ice sheet
; ice shelf
; microwave imagery
; remote sensing
; satellite imagery
; sensible heat flux
; snowmelt
; surface energy
; weather station
; Antarctica
; Florida [United States]
; Pine Island
; Siple Dome
; United States
; West Antarctica
英文摘要: We use reanalysis data and satellite remote sensing of cloud properties to examine how meteorological conditions alter the surface energy balance to cause surface melt that is detectable in satellite passive microwave imagery over West Antarctica. This analysis can detect each of the three primary mechanisms for inducing surface melt at a specific location: thermal blanketing involving sensible heat flux and/or longwave heating by optically thick cloud cover, all-wave radiative enhancement by optically thin cloud cover, and föhn winds. We examine case studies over Pine Island and Thwaites glaciers, which are of interest for ice shelf and ice sheet stability, and over Siple Dome, which is more readily accessible for field work. During January 2015 over Siple Dome we identified a melt event whose origin is an all-wave radiative enhancement by optically thin clouds. During December 2011 over Pine Island and Thwaites glaciers, we identified a melt event caused mainly by thermal blanketing from optically thick clouds. Over Siple Dome, those same 2011 synoptic conditions yielded a thermal-blanketing-driven melt event that was initiated by an impulse of sensible heat flux and then prolonged by cloud longwave heating. The December 2011 synoptic conditions also generated föhn winds at a location on the Ross Ice Shelf adjacent to the Transantarctic Mountains, and we analyze this case with additional support from automatic weather station data. In contrast, a late-summer thermal blanketing period over Pine Island and Thwaites glaciers during February 2013 showed surface melt initiated by cloud longwave heating and then prolonged by enhanced sensible heat flux. One limitation thus far with this type of analysis involves uncertainties in the cloud optical properties. Nevertheless, with improvements this type of analysis can enable quantitative prediction of atmospheric stress on the vulnerable Antarctic ice shelves in a steadily warming climate. © 2021 Madison L. Ghiz et al. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164691
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Scripps Institution of Oceanography, University of California San Diego, San Diego, CA 92093-0206, United States; Science Systems and Applications Inc., Hampton, VA 23666, United States; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY 11973-5000, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO 80309-0311, United States; Antarctic Meteorological Research Center, Space Science and Engineering Center, University of Wisconsin-Madison, Madison, WI 53706, United States; Madison Area Technical College, Madison, WI 53704, United States
Recommended Citation:
Ghiz M.L.,Scott R.C.,Vogelmann A.M.,et al. Energetics of surface melt in West Antarctica[J]. Cryosphere,2021-01-01,15(7)