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Project D6


Large-Eddy Simulation of Atmosphere and Land Interactions over Heterogeneous Surfaces

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Research Area:
Atmosphere, Land surface, Turbulence


project d6

Figure 1. (a) Snap shot of a cross section of potential temperature and surface sensible heat fluxes simulated by LES-ALM. (b) As (a), but for specific humidity and latent heat flux. A large updraft eddy at x = 2 km carries heat and moisture upwards, and a large downdraft eddy at x = 4 km carries heat downwards and moisture upwards (Shao et al. 2013).

We have been developing a numerical modeling system, known as LES-ALM, for simulation of heterogeneous atmospheric and land-surface processes on scale of atmospheric large eddies. LES-ALM includes a large-eddy flow model and a land-surface scheme which ensures the adequate representation of atmosphere–land-surface interactions on large-eddy scales. Improvements made to the land-surface scheme include (1) a multi-layer canopy scheme; (2) a method for flux estimates consistent with the large-eddy sub-grid closure; and (3) an appropriate soil-layer configuration. The model has been implemented to the Selhausen-Merken test site and validated with TR32 airborne and ground-based observations (Shao et al. 2013). The rapid large-eddy and surface feedbacks have been investigated by Liu and Shao (2013). The current research focus is on the propagation of land-surface patterns into the atmosphere. A technique has been developed for quantifying land-surface heterogeneity using the information entropy spectrum (IES). IES allows the identification of dominant heterogeneity scales and provides a sound basis for land-surface simplifications and reconstructions in atmospheric models (Hintz et al. 2014). Techniques based on cluster analysis have been under development for investigation of the propagation of surface patterns into the atmosphere (Lennartz-Sassinek et al. 2014).The scale dependencies of heterogeneous atmosphere-land interactions are being investigated from various perspectives (Shao et al. 2014; Liu et al. 2014).


Cooperation partner:

4 Member(s):

Yaping Shao

Prof. Dr.
Yaping Shao
Principal Investigator
in C7, D6, Z4

University of Cologne
Institute for
Geophysics and Meteorology

Pohligstr. 3
50969 Cologne
Germany

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+49 (0) 221 470 3688
+49 (0) 221 470 5161
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yshao@uni-koeln.de

 

 

Shaofeng Liu

Dr.
Shaofeng Liu
Scientist
in D6

University of Cologne
Institut of
Geophysics and Meteorology

Pohligstr. 3
50969 Cologne
Germany

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+49 (0) 221 470 6487
+49 (0) 221 470 5161
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sliu03@uni-koeln.de

 

 

Michael Hintz

Dr.
Michael Hintz
Scientist
in D6, B1

University of Cologne
Institute of
Geophysics and Meteorology

Pohligstr. 3
50969 Cologne
Germany

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+49 (0) 221 470 6487
+49 (0) 221 470 5161
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mhintz@meteo.uni-koeln.de

 

 

Stefanie Neske

Stefanie Neske
Ph.D. Student
in C7, D6

University of Cologne
Institute for Geophysics and Meteorology


Germany

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(0221) 470 3687

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sneske@uni-koeln.de

 

 


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