DOI: 10.5194/tc-15-2601-2021
论文题名: Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect
作者: Van Tiggelen M. ; Smeets P.C.J.P. ; Reijmer C.H. ; Wouters B. ; Steiner J.F. ; Nieuwstraten E.J. ; Immerzeel W.W. ; Van Den Broeke M.R.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 6 起始页码: 2601
结束页码: 2621
语种: 英语
英文关键词: aerodynamics
; ice sheet
; ICESat
; transect
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: The aerodynamic roughness of heat, moisture, and momentum of a natural surface are important parameters in atmospheric models, as they co-determine the intensity of turbulent transfer between the atmosphere and the surface. Unfortunately this parameter is often poorly known, especially in remote areas where neither high-resolution elevation models nor eddy-covariance measurements are available. In this study we adapt a bulk drag partitioning model to estimate the aerodynamic roughness length (z0m) such that it can be applied to 1D (i.e. unidirectional) elevation profiles, typically measured by laser altimeters. We apply the model to a rough ice surface on the K-transect (west Greenland Ice Sheet) using UAV photogrammetry, and we evaluate the modelled roughness against in situ eddy-covariance observations. We then present a method to estimate the topography at 1 m horizontal resolution using the ICESat-2 satellite laser altimeter, and we demonstrate the high precision of the satellite elevation profiles against UAV photogrammetry. The currently available satellite profiles are used to map the aerodynamic roughness during different time periods along the K-transect, that is compared to an extensive dataset of in situ observations. We find a considerable spatiooral variability in z0m, ranging between 10-4 m for a smooth snow surface and 10-1 m for rough crevassed areas, which confirms the need to incorporate a variable aerodynamic roughness in atmospheric models over ice sheets. © 2021 Maurice van Tiggelen et al. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164819
Appears in Collections: 气候变化与战略
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作者单位: Institute for Marine and Atmospheric Research (IMAU), Utrecht University, Utrecht, Netherlands; Department of Physical Geography, Utrecht University, Utrecht, Netherlands; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands; International Centre for Integrated Mountain Development, Kathmandu, Nepal
Recommended Citation:
Van Tiggelen M.,Smeets P.C.J.P.,Reijmer C.H.,et al. Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect[J]. Cryosphere,2021-01-01,15(6)