The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model

The zonda is a wind that exhibits the so-called foehn effect: a warm, dry, strong wind related to adiabatic compression upon descending in the lee of the Andes. This phenomenon occurs mostly in winter and spring over the entire length of the extratropical Andes. It is frequently detected near the ci...

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Autores principales: Norte, F.A., Ulke, A.G., Simonelli, S.C., Viale, M.
Formato: JOUR
Materias:
atmospheric modeling
atmospheric structure
detection method
extratropical environment
jet stream
lee wave
topographic effect
urban atmosphere
wind
Andes
Argentina
Atlantic Ocean
Mendoza
San Juan [Argentina]
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01777971_v102_n1-2_p1_Norte
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01777971_v102_n1-2_p1_Norte2023-10-03T15:08:06Z The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model Norte, F.A. Ulke, A.G. Simonelli, S.C. Viale, M. atmospheric modeling atmospheric structure detection method extratropical environment jet stream lee wave topographic effect urban atmosphere wind Andes Argentina Atlantic Ocean Mendoza San Juan [Argentina] South America The zonda is a wind that exhibits the so-called foehn effect: a warm, dry, strong wind related to adiabatic compression upon descending in the lee of the Andes. This phenomenon occurs mostly in winter and spring over the entire length of the extratropical Andes. It is frequently detected near the cities of Mendoza and San Juan, the most important urban regions of western Argentina. The aim of this work is to understand why a zonda wind event, occurring on 11 July 2006, reached and maintained the higher category Z4 during several hours. A secondary aim is to evaluate the ability of a Brazilian regional atmospheric modeling system (BRAMS) model to represent the features of this extreme episode and to explore if it can be used to predict a zonda event. The difference found with respect to other severe zonda wind episodes analyzed was that the wind registered the highest category (Z4) with extreme gusts during a long period. This condition was registered in particular on southern plain areas of San Juan province. The phenomenon had a great impact on the community, with residences and buildings being affected or destroyed, trees being felled, power supply and communications being shutdown, and several rural and urban fires being reported. The event was characterized through surface and upper-level information and model results. The synoptic surface and upper-air conditions were those typically associated with a severe zonda wind occurrence: a surface cold front approaching the region, driven by a 500 hPa trough, a strong upper-air jet stream, and a deep low-pressure surface system at higher latitudes over the Atlantic Ocean. The North West Argentine Low in central west Argentina during the following hours could be observed centered approximately at 31°S 66°W. in a few lower latitude than the location observed by National Center of Environmental Prediction (NCEP) reanalysis. On the other hand, it is the authors' impression that the BRAMS model achieved an acceptable representation of some aspects of this zonda wind event. This is the first study on BRAMS model performance in predicting a zonda event. Further and thorough research is required to study the application of BRAMS to contribute to the analysis of the three-dimensional structure and the related physical mechanisms, and to enable skillful comparison with others models. To apply this sophisticated high-resolution model in a region with complex topography and without a dense surface and upper-air observational network is a challenge. © Springer-Verlag 2008. Fil:Norte, F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ulke, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Simonelli, S.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Viale, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01777971_v102_n1-2_p1_Norte
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic atmospheric modeling
atmospheric structure
detection method
extratropical environment
jet stream
lee wave
topographic effect
urban atmosphere
wind
Andes
Argentina
Atlantic Ocean
Mendoza
San Juan [Argentina]
South America
spellingShingle atmospheric modeling
atmospheric structure
detection method
extratropical environment
jet stream
lee wave
topographic effect
urban atmosphere
wind
Andes
Argentina
Atlantic Ocean
Mendoza
San Juan [Argentina]
South America
Norte, F.A.
Ulke, A.G.
Simonelli, S.C.
Viale, M.
The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model
topic_facet atmospheric modeling
atmospheric structure
detection method
extratropical environment
jet stream
lee wave
topographic effect
urban atmosphere
wind
Andes
Argentina
Atlantic Ocean
Mendoza
San Juan [Argentina]
South America
description The zonda is a wind that exhibits the so-called foehn effect: a warm, dry, strong wind related to adiabatic compression upon descending in the lee of the Andes. This phenomenon occurs mostly in winter and spring over the entire length of the extratropical Andes. It is frequently detected near the cities of Mendoza and San Juan, the most important urban regions of western Argentina. The aim of this work is to understand why a zonda wind event, occurring on 11 July 2006, reached and maintained the higher category Z4 during several hours. A secondary aim is to evaluate the ability of a Brazilian regional atmospheric modeling system (BRAMS) model to represent the features of this extreme episode and to explore if it can be used to predict a zonda event. The difference found with respect to other severe zonda wind episodes analyzed was that the wind registered the highest category (Z4) with extreme gusts during a long period. This condition was registered in particular on southern plain areas of San Juan province. The phenomenon had a great impact on the community, with residences and buildings being affected or destroyed, trees being felled, power supply and communications being shutdown, and several rural and urban fires being reported. The event was characterized through surface and upper-level information and model results. The synoptic surface and upper-air conditions were those typically associated with a severe zonda wind occurrence: a surface cold front approaching the region, driven by a 500 hPa trough, a strong upper-air jet stream, and a deep low-pressure surface system at higher latitudes over the Atlantic Ocean. The North West Argentine Low in central west Argentina during the following hours could be observed centered approximately at 31°S 66°W. in a few lower latitude than the location observed by National Center of Environmental Prediction (NCEP) reanalysis. On the other hand, it is the authors' impression that the BRAMS model achieved an acceptable representation of some aspects of this zonda wind event. This is the first study on BRAMS model performance in predicting a zonda event. Further and thorough research is required to study the application of BRAMS to contribute to the analysis of the three-dimensional structure and the related physical mechanisms, and to enable skillful comparison with others models. To apply this sophisticated high-resolution model in a region with complex topography and without a dense surface and upper-air observational network is a challenge. © Springer-Verlag 2008.
format JOUR
author Norte, F.A.
Ulke, A.G.
Simonelli, S.C.
Viale, M.
author_facet Norte, F.A.
Ulke, A.G.
Simonelli, S.C.
Viale, M.
author_sort Norte, F.A.
title The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model
title_short The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model
title_full The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model
title_fullStr The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model
title_full_unstemmed The severe zonda wind event of 11 July 2006 east of the Andes Cordillera (Argentine): A case study using the BRAMS model
title_sort severe zonda wind event of 11 july 2006 east of the andes cordillera (argentine): a case study using the brams model
url http://hdl.handle.net/20.500.12110/paper_01777971_v102_n1-2_p1_Norte
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