Two-dimensional simulations of katabatic layers observed during the GIMEX experiment
International audience 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 wh...
Main Author: | |
---|---|
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1999
|
Subjects: | |
Online Access: | https://hal.science/hal-00329120 https://hal.science/hal-00329120/document https://hal.science/hal-00329120/file/angeo-17-533-1999.pdf |
id |
ftutoulouse3hal:oai:HAL:hal-00329120v1 |
---|---|
record_format |
openpolar |
spelling |
ftutoulouse3hal:oai:HAL:hal-00329120v1 2024-09-15T18:09:54+00:00 Two-dimensional simulations of katabatic layers observed during the GIMEX experiment Elkhalfi, A. Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 1999 https://hal.science/hal-00329120 https://hal.science/hal-00329120/document https://hal.science/hal-00329120/file/angeo-17-533-1999.pdf en eng HAL CCSD European Geosciences Union hal-00329120 https://hal.science/hal-00329120 https://hal.science/hal-00329120/document https://hal.science/hal-00329120/file/angeo-17-533-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329120 Annales Geophysicae, 1999, 17 (4), pp.533-546 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1999 ftutoulouse3hal 2024-06-25T00:12:06Z International audience 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. Article in Journal/Newspaper Greenland Ice cap Tundra Université Toulouse III - Paul Sabatier: HAL-UPS |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Elkhalfi, A. Two-dimensional simulations of katabatic layers observed during the GIMEX experiment |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Elkhalfi, A. |
author_facet |
Elkhalfi, A. |
author_sort |
Elkhalfi, A. |
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 |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.science/hal-00329120 https://hal.science/hal-00329120/document https://hal.science/hal-00329120/file/angeo-17-533-1999.pdf |
genre |
Greenland Ice cap Tundra |
genre_facet |
Greenland Ice cap Tundra |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329120 Annales Geophysicae, 1999, 17 (4), pp.533-546 |
op_relation |
hal-00329120 https://hal.science/hal-00329120 https://hal.science/hal-00329120/document https://hal.science/hal-00329120/file/angeo-17-533-1999.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1810447507547750400 |