Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model

In this study the capability of the MM5 model in simulating the main mode of intraseasonal variability during the warm season over South America is evaluated through a series of sensitivity experiments. Several 3-month simulations nested into ERA40 reanalysis were carried out using different cumulus...

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Autores principales: Solman, Silvina Alicia, Pessacg, Natalia Liz
Publicado: 2012
Materias:
MM5 model
Regional climate modeling
Sensitivity experiments
South America
atmospheric circulation
boundary condition
boundary layer
climate modeling
cumulus
numerical model
precipitation (climatology)
regional climate
seasonal variation
spatial distribution
Atlantic Ocean
Atlantic Ocean (South)
La Plata Basin
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v38_n1-2_p281_Solman
http://hdl.handle.net/20.500.12110/paper_09307575_v38_n1-2_p281_Solman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09307575_v38_n1-2_p281_Solman
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spelling paper:paper_09307575_v38_n1-2_p281_Solman2023-06-08T15:52:40Z Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model Solman, Silvina Alicia Pessacg, Natalia Liz MM5 model Regional climate modeling Sensitivity experiments South America atmospheric circulation boundary condition boundary layer climate modeling cumulus numerical model precipitation (climatology) regional climate seasonal variation spatial distribution Atlantic Ocean Atlantic Ocean (South) La Plata Basin In this study the capability of the MM5 model in simulating the main mode of intraseasonal variability during the warm season over South America is evaluated through a series of sensitivity experiments. Several 3-month simulations nested into ERA40 reanalysis were carried out using different cumulus schemes and planetary boundary layer schemes in an attempt to define the optimal combination of physical parameterizations for simulating alternating wet and dry conditions over La Plata Basin (LPB) and the South Atlantic Convergence Zone regions, respectively. The results were compared with different observational datasets and model evaluation was performed taking into account the spatial distribution of monthly precipitation and daily statistics of precipitation over the target regions. Though every experiment was able to capture the contrasting behavior of the precipitation during the simulated period, precipitation was largely underestimated particularly over the LPB region, mainly due to a misrepresentation in the moisture flux convergence. Experiments using grid nudging of the winds above the planetary boundary layer showed a better performance compared with those in which no constrains were imposed to the regional circulation within the model domain. Overall, no single experiment was found to perform the best over the entire domain and during the two contrasting months. The experiment that outperforms depends on the area of interest, being the simulation using the Grell (Kain-Fritsch) cumulus scheme in combination with the MRF planetary boundary layer scheme more adequate for subtropical (tropical) latitudes. The ensemble of the sensitivity experiments showed a better performance compared with any individual experiment. © 2011 Springer-Verlag. Fil:Solman, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pessacg, N.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v38_n1-2_p281_Solman http://hdl.handle.net/20.500.12110/paper_09307575_v38_n1-2_p281_Solman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic MM5 model
Regional climate modeling
Sensitivity experiments
South America
atmospheric circulation
boundary condition
boundary layer
climate modeling
cumulus
numerical model
precipitation (climatology)
regional climate
seasonal variation
spatial distribution
Atlantic Ocean
Atlantic Ocean (South)
La Plata Basin
spellingShingle MM5 model
Regional climate modeling
Sensitivity experiments
South America
atmospheric circulation
boundary condition
boundary layer
climate modeling
cumulus
numerical model
precipitation (climatology)
regional climate
seasonal variation
spatial distribution
Atlantic Ocean
Atlantic Ocean (South)
La Plata Basin
Solman, Silvina Alicia
Pessacg, Natalia Liz
Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
topic_facet MM5 model
Regional climate modeling
Sensitivity experiments
South America
atmospheric circulation
boundary condition
boundary layer
climate modeling
cumulus
numerical model
precipitation (climatology)
regional climate
seasonal variation
spatial distribution
Atlantic Ocean
Atlantic Ocean (South)
La Plata Basin
description In this study the capability of the MM5 model in simulating the main mode of intraseasonal variability during the warm season over South America is evaluated through a series of sensitivity experiments. Several 3-month simulations nested into ERA40 reanalysis were carried out using different cumulus schemes and planetary boundary layer schemes in an attempt to define the optimal combination of physical parameterizations for simulating alternating wet and dry conditions over La Plata Basin (LPB) and the South Atlantic Convergence Zone regions, respectively. The results were compared with different observational datasets and model evaluation was performed taking into account the spatial distribution of monthly precipitation and daily statistics of precipitation over the target regions. Though every experiment was able to capture the contrasting behavior of the precipitation during the simulated period, precipitation was largely underestimated particularly over the LPB region, mainly due to a misrepresentation in the moisture flux convergence. Experiments using grid nudging of the winds above the planetary boundary layer showed a better performance compared with those in which no constrains were imposed to the regional circulation within the model domain. Overall, no single experiment was found to perform the best over the entire domain and during the two contrasting months. The experiment that outperforms depends on the area of interest, being the simulation using the Grell (Kain-Fritsch) cumulus scheme in combination with the MRF planetary boundary layer scheme more adequate for subtropical (tropical) latitudes. The ensemble of the sensitivity experiments showed a better performance compared with any individual experiment. © 2011 Springer-Verlag.
author Solman, Silvina Alicia
Pessacg, Natalia Liz
author_facet Solman, Silvina Alicia
Pessacg, Natalia Liz
author_sort Solman, Silvina Alicia
title Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
title_short Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
title_full Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
title_fullStr Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
title_full_unstemmed Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
title_sort regional climate simulations over south america: sensitivity to model physics and to the treatment of lateral boundary conditions using the mm5 model
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v38_n1-2_p281_Solman
http://hdl.handle.net/20.500.12110/paper_09307575_v38_n1-2_p281_Solman
work_keys_str_mv AT solmansilvinaalicia regionalclimatesimulationsoversouthamericasensitivitytomodelphysicsandtothetreatmentoflateralboundaryconditionsusingthemm5model
AT pessacgnatalializ regionalclimatesimulationsoversouthamericasensitivitytomodelphysicsandtothetreatmentoflateralboundaryconditionsusingthemm5model
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