[1049] - Impact of Surface-Heterogeneity on AtmosphereandLand-Surface Interactions

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Shao, Y., Liu, S., Hintz, M., Kunoth, A., Simmer, C., 2014. Impact of Surface-Heterogeneity on AtmosphereandLand-Surface Interactions. Journal of Geophysical Research: Atmosphere, (submitted manuscript), 1 - 40.
Title(s):Main Title: Impact of Surface-Heterogeneity on AtmosphereandLand-Surface Interactions
Description(s):Abstract: Land-surface heterogeneity occurs on a continuum of scales, but it remains an unsolved problem how land-surface heterogeneity should be properly accounted for in land-surface and atmospheric boundary-layer parameterizations for weather and climate models. In this paper, we investigate the propagation and persistency of land-surface heterogeneity in a convective boundary layer using an atmosphere and land-surface coupled large-eddy model (LES-ALM). Model simulations are carried out for three different land surfaces of different heterogeneity scales but with the same parameter probability density function, and for a uniform land surface. A multi-scale analysis using wavelet decomposition and various temporal averages is carried out. It is found that domain-and-time averaged energy fluxes and state variables are not sensitive to the land-surface heterogeneity, in consistency with the results of earlier studies. However, our simulation also shows that this apparent insensitivity is subject to the condition that the spatial averaging is on a scale much larger than the scale of the land-surface heterogeneity, and the patterns of the atmospheric quantities in the lower part of the atmospheric boundary layer (ABL) are by all means sensitive to land-surface heterogeneity. The propagation and persistency of land-surface heterogeneity in the atmosphere is quite complex. Close to the surface, the patterns of all atmospheric quantities resemble the land-surface pattern. For short averaging times, the footprints of land-surface heterogeneity in the atmosphere are strongly blurred by the “eigen” turbulence pattern generated by the global structure of the ABL, but reemerges as the time of averaging increases and the “eigen” turbulence patterns are averaged out. In general the effect of land-surface heterogeneity diminishes with height as expected, but the persistency of land-surface heterogeneity is dependent on the heterogeneity scale. Small-scale land-surface heterogeneities are rapidly destroyed by turbulent mixing, while large-scale heterogeneity features can persist over a depth of several hundred meters.
Responsible Party
Creator(s):Author: Yaping Shao
Author: Shaofeng Liu
Author: Michael Hintz
Author: Angela Kunoth
Author: Clemens Simmer
Publisher:Wiley Online Library
TR32 Topic:Atmosphere
Related Sub-project(s):D6, C7
Subject(s):CRC/TR32 Keywords: Atmosphere–Land Interaction, Heterogeneous, LES
File Details
File Name:YSetal_18May2014_Final.pdf
Data Type:Text
Size(s):40 Pages
File Size:4724 kB (4.613 MB)
Date(s):Date Accepted: 2014-09-12
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:None
Measurement Location:--None--
Specific Informations - Publication
Article Type:Journal
Source:Journal of Geophysical Research: Atmosphere
Volume:(submitted manuscript)
Page Range:1 - 40
Metadata Details
Metadata Creator:Shaofeng Liu
Metadata Created:2014-09-12
Metadata Last Updated:2014-09-12
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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