气候变化领域集成服务门户(CCPortal): Scale Invariance of Albedo-Based Wind Friction Velocity

CCPortal

DOI	10.1029/2019JD031978
	Scale Invariance of Albedo-Based Wind Friction Velocity
	Ziegler N.P.; Webb N.P.; Chappell A.; LeGrand S.L.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	Obtaining reliable estimates of aerodynamic roughness is necessary to interpret and accurately predict aeolian sediment transport dynamics. However, inherent uncertainties in field measurements and models of surface aerodynamic properties continue to undermine aeolian research, monitoring, and dust modeling. A new relation between aerodynamic shelter and land surface shadow has been established at the wind tunnel scale, enabling the potential for estimates of wind erosion and dust emission to be obtained across scales from albedo data. Here, we compare estimates of wind friction velocity (u) derived from traditional methods (wind speed profiles) with those derived from the albedo model at two separate scales using bare soil patch (via net radiometers) and landscape (via Moderate Resolution Imaging Spectroradiometer [MODIS] 500 m) data sets. Results show that profile-derived estimates of u are highly variable in anisotropic surface roughness due to changes in wind direction and fetch. Wind speed profiles poorly estimate soil surface (bed) wind friction velocities necessary for aeolian sediment transport research and modeling. Albedo-based estimates of u* at both scales have small variability because the estimate is integrated over a defined, fixed area and resolves the partition of wind momentum between roughness elements and the soil surface. We demonstrate that the wind tunnel-based calibration of albedo for predicting wind friction velocities at the soil surface (us) is applicable across scales. The albedo-based approach enables consistent and reliable drag partition correction across scales for model and field estimates of us necessary for wind erosion and dust emission modeling. © 2020. The Authors.
英文关键词	aeolian; aerodynamic roughness; albedo; dust; friction velocity; satellite remote sensing
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185831
作者单位	Cold Regions Research and Engineering Laboratory (CRREL), U.S. Army Engineer Research and Development Center, Hanover, NH, United States; USDA-ARS Jornada Experimental Range, Las Cruces, NM, United States; School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom
推荐引用方式 GB/T 7714	Ziegler N.P.,Webb N.P.,Chappell A.,et al. Scale Invariance of Albedo-Based Wind Friction Velocity[J],2020,125(16).
APA	Ziegler N.P.,Webb N.P.,Chappell A.,&LeGrand S.L..(2020).Scale Invariance of Albedo-Based Wind Friction Velocity.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Ziegler N.P.,et al."Scale Invariance of Albedo-Based Wind Friction Velocity".Journal of Geophysical Research: Atmospheres 125.16(2020).