Impact of Surface-Heterogeneity on AtmosphereandLand-Surface Interactions
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| Title: | Main Title: Impact of Surface-Heterogeneity on AtmosphereandLand-Surface Interactions |
| Description: | 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
| Creators: | Yaping Shao (Author), Shaofeng Liu (Author), Michael Hintz (Author), Angela Kunoth (Author), Clemens Simmer (Author) |
| Publisher: | Wiley Online Library |
| Publication Year: | 2014 |
Topic
| TR32 Topic: | Atmosphere |
| Related Subprojects: | D6, C7 |
| Subjects: | Keywords: Atmosphere–Land Interaction, Heterogeneous, LES |
File Details
| Filename: | YSetal_18May2014_Final.pdf |
| Data Type: | Text - Article |
| Size: | 40 Pages |
| File Size: | 4.6 MB |
| Date: | Accepted: 12.09.2014 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| Licence: | [TR32DB] Data policy agreement |
Geographic
Specific Information - Publication
| Publication Status: | In Review |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Journal of Geophysical Research: Atmosphere |
| Volume: | (submitted manuscript) |
| Number of Pages: | 40 (1 - 40) |
Metadata Details
| Metadata Creator: | Shaofeng Liu |
| Metadata Created: | 12.09.2014 |
| Metadata Last Updated: | 12.09.2014 |
| Subproject: | D6 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 788 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 4 |
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