气候变化领域集成服务门户(CCPortal): Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect

CCPortal

DOI	10.5194/tc-15-2601-2021
	Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect
	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.
发表日期	2021
ISSN	19940416
起始页码	2601
结束页码	2621
卷号	15 期号:6
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.
英文关键词	aerodynamics; ice sheet; ICESat; transect; Arctic; Greenland; Greenland Ice Sheet
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202441
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
推荐引用方式 GB/T 7714	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],2021,15(6).
APA	Van Tiggelen M..,Smeets P.C.J.P..,Reijmer C.H..,Wouters B..,Steiner J.F..,...&Van Den Broeke M.R..(2021).Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect.Cryosphere,15(6).
MLA	Van Tiggelen M.,et al."Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect".Cryosphere 15.6(2021).