Two-dimensional simulations of katabatic layers observed during the GIMEX experiment
Abstract. The hydrostatic model SALSA is used to simulate a particular event observed during the Green-land Ice Margin EXperiment ‘‘GIMEX’ ’ (on July 12th, 1991). The time evolution of the large-scale flow was incorporated in the model through time dependent boundary conditions which were updated us...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.523.2126 2023-05-15T16:38:07+02:00 Two-dimensional simulations of katabatic layers observed during the GIMEX experiment A. Elkhalfi The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.2126 http://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.2126 http://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf text ftciteseerx 2016-01-08T10:14:18Z Abstract. The hydrostatic model SALSA is used to simulate a particular event observed during the Green-land Ice Margin EXperiment ‘‘GIMEX’ ’ (on July 12th, 1991). The time evolution of the large-scale flow was incorporated in the model through time dependent boundary conditions which were updated using the closest upwind sounding. A turbulent scheme for the stable boundary layer and an appropriate parametriza-tion of the surface fluxes implemented in the same model, are used for this study. The simulation results are discussed and compared to the available observations. The computed turbulent fluxes are correctly estimated. The model predicts a mixing zone of about 1500 m high which is in good agreement with tundra site observations. Over the ice cap, the katabatic layer is correctly simulated by the model. Its height of 80–300 m is well estimated. The comparison between the simulation and observations taken at ice cap sites is reasonably valid. The ablation computed along the ice cap corresponds well to the values reconstructed of observations at sites 4 and 9. Finally, a sensibility study to a specified westward geostrophic wind (2 ms)1) shows that the consideration of this latter improves the simulated tundra wind evolution. Key words. Meteorology and atmospheric dynamics (mesoscalemeteorology; polar meteorology; turbulance). 1 Text Ice cap Tundra Unknown |
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Open Polar |
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ftciteseerx |
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English |
description |
Abstract. The hydrostatic model SALSA is used to simulate a particular event observed during the Green-land Ice Margin EXperiment ‘‘GIMEX’ ’ (on July 12th, 1991). The time evolution of the large-scale flow was incorporated in the model through time dependent boundary conditions which were updated using the closest upwind sounding. A turbulent scheme for the stable boundary layer and an appropriate parametriza-tion of the surface fluxes implemented in the same model, are used for this study. The simulation results are discussed and compared to the available observations. The computed turbulent fluxes are correctly estimated. The model predicts a mixing zone of about 1500 m high which is in good agreement with tundra site observations. Over the ice cap, the katabatic layer is correctly simulated by the model. Its height of 80–300 m is well estimated. The comparison between the simulation and observations taken at ice cap sites is reasonably valid. The ablation computed along the ice cap corresponds well to the values reconstructed of observations at sites 4 and 9. Finally, a sensibility study to a specified westward geostrophic wind (2 ms)1) shows that the consideration of this latter improves the simulated tundra wind evolution. Key words. Meteorology and atmospheric dynamics (mesoscalemeteorology; polar meteorology; turbulance). 1 |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. Elkhalfi |
spellingShingle |
A. Elkhalfi Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
author_facet |
A. Elkhalfi |
author_sort |
A. Elkhalfi |
title |
Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
title_short |
Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
title_full |
Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
title_fullStr |
Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
title_full_unstemmed |
Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
title_sort |
two-dimensional simulations of katabatic layers observed during the gimex experiment |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.2126 http://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf |
genre |
Ice cap Tundra |
genre_facet |
Ice cap Tundra |
op_source |
http://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.2126 http://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766028407065280512 |