DOI: 10.5194/tc-9-971-2015
Scopus记录号: 2-s2.0-84929302802
论文题名: Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012
作者: Niwano M ; , Aoki T ; , Matoba S ; , Yamaguchi S ; , Tanikawa T ; , Kuchiki K ; , Motoyama H
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 3 起始页码: 971
结束页码: 988
语种: 英语
英文关键词: albedo
; energy balance
; grain size
; in situ measurement
; microbial activity
; numerical model
; one-dimensional modeling
; snowmelt
; snowpack
; spatiotemporal analysis
; surface energy
; temperature profile
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: The surface energy balance (SEB) from 30 June to 14 July 2012 at site SIGMA (Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic)-A, (78°03′ N, 67°38′ W; 1490 m a.s.l.) on the northwest Greenland Ice Sheet (GrIS) was investigated by using in situ atmospheric and snow measurements as well as numerical modeling with a one-dimensional multi-layered physical snowpack model called SMAP (Snow Metamorphism and Albedo Process). At SIGMA-A, remarkable near-surface snowmelt and continuous heavy rainfall (accumulated precipitation between 10 and 14 July was estimated to be 100 mm) were observed after 10 July 2012. Application of the SMAP model to the GrIS snowpack was evaluated based on the snow temperature profile, snow surface temperature, surface snow grain size, and shortwave albedo, all of which the model simulated reasonably well. Above all, the fact that the SMAP model successfully reproduced frequently observed rapid increases in snow albedo under cloudy conditions highlights the advantage of the physically based snow albedo model (PBSAM) incorporated in the SMAP model. Using such data and model, we estimated the SEB at SIGMA-A from 30 June to 14 July 2012. Radiation-related fluxes were obtained from in situ measurements, whereas other fluxes were calculated with the SMAP model. By examining the components of the SEB, we determined that low-level clouds accompanied by a significant temperature increase played an important role in the melt event observed at SIGMA-A. These conditions induced a remarkable surface heating via cloud radiative forcing in the polar region. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75300
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention, Nagaoka, Japan; Earth Observation Research Center, Japan Aerospace Exploration Agency, Tsukuba, Japan; National Institute of Polar Research, Tachikawa, Japan
Recommended Citation:
Niwano M,, Aoki T,, Matoba S,et al. Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012[J]. Cryosphere,2015-01-01,9(3)