Two-dimensional simulations of katabatic layers observed during the GIMEX experiment
The hydrostatic model SALSA is used to simulate a particular event observed during the Greenland 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...
Published in: | Annales Geophysicae |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
1999
|
Subjects: | |
Online Access: | https://doi.org/10.1007/s00585-999-0533-3 https://doaj.org/article/dfead92c61c74318a769e03041290de3 |
id |
ftdoajarticles:oai:doaj.org/article:dfead92c61c74318a769e03041290de3 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:dfead92c61c74318a769e03041290de3 2023-05-15T16:29:25+02:00 Two-dimensional simulations of katabatic layers observed during the GIMEX experiment A. Elkhalfi 1999-04-01T00:00:00Z https://doi.org/10.1007/s00585-999-0533-3 https://doaj.org/article/dfead92c61c74318a769e03041290de3 EN eng Copernicus Publications https://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0533-3 0992-7689 1432-0576 https://doaj.org/article/dfead92c61c74318a769e03041290de3 Annales Geophysicae, Vol 17, Pp 533-546 (1999) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1999 ftdoajarticles https://doi.org/10.1007/s00585-999-0533-3 2022-12-30T21:08:26Z The hydrostatic model SALSA is used to simulate a particular event observed during the Greenland 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 parametrization 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 (mesoscale meteorology; polar meteorology; turbulance) Article in Journal/Newspaper Greenland Ice cap Tundra Directory of Open Access Journals: DOAJ Articles Greenland Annales Geophysicae 17 4 533 546 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 A. Elkhalfi Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The hydrostatic model SALSA is used to simulate a particular event observed during the Greenland 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 parametrization 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 (mesoscale meteorology; polar meteorology; turbulance) |
format |
Article in Journal/Newspaper |
author |
A. Elkhalfi |
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 |
publisher |
Copernicus Publications |
publishDate |
1999 |
url |
https://doi.org/10.1007/s00585-999-0533-3 https://doaj.org/article/dfead92c61c74318a769e03041290de3 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice cap Tundra |
genre_facet |
Greenland Ice cap Tundra |
op_source |
Annales Geophysicae, Vol 17, Pp 533-546 (1999) |
op_relation |
https://www.ann-geophys.net/17/533/1999/angeo-17-533-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0533-3 0992-7689 1432-0576 https://doaj.org/article/dfead92c61c74318a769e03041290de3 |
op_doi |
https://doi.org/10.1007/s00585-999-0533-3 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
4 |
container_start_page |
533 |
op_container_end_page |
546 |
_version_ |
1766019113137733632 |