DOI: 10.5194/tc-14-3645-2020
论文题名: Evaluation of a new snow albedo scheme for the greenland ice sheet in the regional atmospheric climate model (racmo2)
作者: Van Dalum C.T. ; Jan Van De Berg W. ; Lhermitte S. ; Van Den Broeke M.R.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 11 起始页码: 3645
结束页码: 3662
语种: 英语
英文关键词: ablation
; albedo
; climate modeling
; MODIS
; parameterization
; radiative transfer
; regional climate
; remote sensing
; satellite data
; Arctic
; Greenland
; Greenland Ice Sheet
; Kangerlussuaq Fjord
英文摘要: Snow and ice albedo schemes in present-day climate models often lack a sophisticated radiation penetration scheme and do not explicitly include spectral albedo variations. In this study, we evaluate a new snow albedo scheme in the Regional Atmospheric Climate Model (RACMO2) for the Greenland ice sheet, version 2.3p3, that includes these processes. The new albedo scheme uses the TwostreAm Radiative TransfEr in Snow (TARTES) model and the Spectral-To-NarrOWBand ALbedo (SNOWBAL) module, version 1.2. Additionally, the bare-ice albedo parameterization has been updated. The snow and ice broadband and narrowband albedo output of the updated version of RACMO2 is evaluated using the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) and Kangerlussuaq transect (K-Transect) in situ data and Moderate Resolution Imaging Spectroradiometer (MODIS) remote-sensing observations. Generally, the modeled narrowband and broadband albedo is in very good agreement with satellite observations, leading to a negligible domain-Averaged broadband albedo bias for the interior. Some discrepancies are, however, observed close to the ice margin. Compared to the previous model version, RACMO2.3p2, the broadband albedo is considerably higher in the bare-ice zone during the ablation season, as atmospheric conditions now alter the bare-ice broadband albedo. For most other regions, however, the updated broadband albedo is lower due to spectral effects, radiation penetration or enhanced snow metamorphism. © 2020 BMJ Publishing Group. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164609
Appears in Collections: 气候变化与战略
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作者单位: Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
Recommended Citation:
Van Dalum C.T.,Jan Van De Berg W.,Lhermitte S.,et al. Evaluation of a new snow albedo scheme for the greenland ice sheet in the regional atmospheric climate model (racmo2)[J]. Cryosphere,2020-01-01,14(11)