Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere

Wintertime fronts climatology and the relationship between fronts and precipitation as depicted by a group of CMIP5 models are evaluated over the Southern Hemisphere (SH). The frontal activity is represented by an index that takes into account the vorticity, the gradient of temperature and the speci...

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Autores principales: Blázquez, J., Solman, S.A.
Formato: JOUR
Materias:
CMIP5 models
Frontal activity
Precipitation
Present climate
Southern Hemisphere
atmospheric front
climate modeling
climatology
CMIP
precipitation (climatology)
winter
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09307575_v50_n7-8_p2705_Blazquez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09307575_v50_n7-8_p2705_Blazquez
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spelling todo:paper_09307575_v50_n7-8_p2705_Blazquez2023-10-03T15:48:05Z Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere Blázquez, J. Solman, S.A. CMIP5 models Frontal activity Precipitation Present climate Southern Hemisphere atmospheric front climate modeling climatology CMIP precipitation (climatology) Southern Hemisphere winter Wintertime fronts climatology and the relationship between fronts and precipitation as depicted by a group of CMIP5 models are evaluated over the Southern Hemisphere (SH). The frontal activity is represented by an index that takes into account the vorticity, the gradient of temperature and the specific humidity at the 850 hPa level. ERA-Interim reanalysis and GPCP datasets are used to assess the performance of the models in the present climate. Overall, it is found that the models can reproduce adequately the main features of frontal activity and front frequency over the SH. The total precipitation is overestimated in most of the models, especially the maximum values over the mid latitudes. This overestimation could be related to the high values of precipitation frequency that are identified in some of the models evaluated. The relationship between fronts and precipitation has also been evaluated in terms of both frequency of frontal precipitation and percentage of precipitation due to fronts. In general terms, the models overestimate the proportion between frontal and total precipitation. In contrast with frequency of total precipitation, the frequency of frontal precipitation is well reproduced by the models, with the higher values located at the mid latitudes. The results suggest that models represent very well the dynamic forcing (fronts) and the frequency of frontal precipitation, though the amount of precipitation due to fronts is overestimated. © 2017, Springer-Verlag GmbH Germany. Fil:Blázquez, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Solman, S.A. 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_09307575_v50_n7-8_p2705_Blazquez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic CMIP5 models
Frontal activity
Precipitation
Present climate
Southern Hemisphere
atmospheric front
climate modeling
climatology
CMIP
precipitation (climatology)
Southern Hemisphere
winter
spellingShingle CMIP5 models
Frontal activity
Precipitation
Present climate
Southern Hemisphere
atmospheric front
climate modeling
climatology
CMIP
precipitation (climatology)
Southern Hemisphere
winter
Blázquez, J.
Solman, S.A.
Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere
topic_facet CMIP5 models
Frontal activity
Precipitation
Present climate
Southern Hemisphere
atmospheric front
climate modeling
climatology
CMIP
precipitation (climatology)
Southern Hemisphere
winter
description Wintertime fronts climatology and the relationship between fronts and precipitation as depicted by a group of CMIP5 models are evaluated over the Southern Hemisphere (SH). The frontal activity is represented by an index that takes into account the vorticity, the gradient of temperature and the specific humidity at the 850 hPa level. ERA-Interim reanalysis and GPCP datasets are used to assess the performance of the models in the present climate. Overall, it is found that the models can reproduce adequately the main features of frontal activity and front frequency over the SH. The total precipitation is overestimated in most of the models, especially the maximum values over the mid latitudes. This overestimation could be related to the high values of precipitation frequency that are identified in some of the models evaluated. The relationship between fronts and precipitation has also been evaluated in terms of both frequency of frontal precipitation and percentage of precipitation due to fronts. In general terms, the models overestimate the proportion between frontal and total precipitation. In contrast with frequency of total precipitation, the frequency of frontal precipitation is well reproduced by the models, with the higher values located at the mid latitudes. The results suggest that models represent very well the dynamic forcing (fronts) and the frequency of frontal precipitation, though the amount of precipitation due to fronts is overestimated. © 2017, Springer-Verlag GmbH Germany.
format JOUR
author Blázquez, J.
Solman, S.A.
author_facet Blázquez, J.
Solman, S.A.
author_sort Blázquez, J.
title Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere
title_short Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere
title_full Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere
title_fullStr Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere
title_full_unstemmed Fronts and precipitation in CMIP5 models for the austral winter of the Southern Hemisphere
title_sort fronts and precipitation in cmip5 models for the austral winter of the southern hemisphere
url http://hdl.handle.net/20.500.12110/paper_09307575_v50_n7-8_p2705_Blazquez
work_keys_str_mv AT blazquezj frontsandprecipitationincmip5modelsfortheaustralwinterofthesouthernhemisphere
AT solmansa frontsandprecipitationincmip5modelsfortheaustralwinterofthesouthernhemisphere
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