Links between topography, moisture fluxes pathways and precipitation over South America

The Andes Cordillera plays a role in driving moisture and heat from tropical onto subtropical South America. It forces the development of a lee-side trough that covers most of western Argentina and a low-level jet that maximizes over Paraguay, eastern Bolivia and northern Argentina and is tightly li...

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Autores principales:	Saurral, Ramiro Ignacio, Camilloni, Ines Angela
Publicado:	2015
Materias:	Andes Cordillera Global climate models Precipitation South American climate atmospheric moisture climate modeling global climate precipitation (climatology) precipitation assessment rainfall topography Andes Argentina Bolivia Paraguay
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v45_n3-4_p777_Saurral http://hdl.handle.net/20.500.12110/paper_09307575_v45_n3-4_p777_Saurral
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09307575_v45_n3-4_p777_Saurral
record_format	dspace
spelling	paper:paper_09307575_v45_n3-4_p777_Saurral2023-06-08T15:52:45Z Links between topography, moisture fluxes pathways and precipitation over South America Saurral, Ramiro Ignacio Camilloni, Ines Angela Andes Cordillera Global climate models Precipitation South American climate atmospheric moisture climate modeling global climate precipitation (climatology) precipitation assessment rainfall topography Andes Argentina Bolivia Paraguay The Andes Cordillera plays a role in driving moisture and heat from tropical onto subtropical South America. It forces the development of a lee-side trough that covers most of western Argentina and a low-level jet that maximizes over Paraguay, eastern Bolivia and northern Argentina and is tightly linked to precipitation variability over much of central and southeastern South America. Its steep slopes and the large zonal gradients in topography between the Equator and 40°S are misrepresented in climate simulations using Global Climate Models (GCM) with resolutions coarser than about 100 km, since they naturally have a poor representation of the Andes and related circulation features. This paper analyses the impact of varying artificially the altitude of the Andes Cordillera in a GCM as well as increasing the horizontal resolution to study how these variations determine moisture fluxes and precipitation over selected regions of South America. Results show that the height of the Andes is crucial in shaping moisture fluxes pathways onto subtropical South America all year long. In particular, the low-level jet is only simulated when the Andes heights are doubled. At the same time, the relationship between the Andes shape and the location of the Bolivian High in summer is also discussed. In terms of precipitation, the lowest bias in the simulations is achieved when the horizontal resolution is increased, while in particular near the Andes foothills the simulated annual rainfall is largely determined by the Mountains shape. © 2014, Springer-Verlag Berlin Heidelberg. Fil:Saurral, R.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Camilloni, I.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v45_n3-4_p777_Saurral http://hdl.handle.net/20.500.12110/paper_09307575_v45_n3-4_p777_Saurral
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Andes Cordillera Global climate models Precipitation South American climate atmospheric moisture climate modeling global climate precipitation (climatology) precipitation assessment rainfall topography Andes Argentina Bolivia Paraguay
spellingShingle	Andes Cordillera Global climate models Precipitation South American climate atmospheric moisture climate modeling global climate precipitation (climatology) precipitation assessment rainfall topography Andes Argentina Bolivia Paraguay Saurral, Ramiro Ignacio Camilloni, Ines Angela Links between topography, moisture fluxes pathways and precipitation over South America
topic_facet	Andes Cordillera Global climate models Precipitation South American climate atmospheric moisture climate modeling global climate precipitation (climatology) precipitation assessment rainfall topography Andes Argentina Bolivia Paraguay
description	The Andes Cordillera plays a role in driving moisture and heat from tropical onto subtropical South America. It forces the development of a lee-side trough that covers most of western Argentina and a low-level jet that maximizes over Paraguay, eastern Bolivia and northern Argentina and is tightly linked to precipitation variability over much of central and southeastern South America. Its steep slopes and the large zonal gradients in topography between the Equator and 40°S are misrepresented in climate simulations using Global Climate Models (GCM) with resolutions coarser than about 100 km, since they naturally have a poor representation of the Andes and related circulation features. This paper analyses the impact of varying artificially the altitude of the Andes Cordillera in a GCM as well as increasing the horizontal resolution to study how these variations determine moisture fluxes and precipitation over selected regions of South America. Results show that the height of the Andes is crucial in shaping moisture fluxes pathways onto subtropical South America all year long. In particular, the low-level jet is only simulated when the Andes heights are doubled. At the same time, the relationship between the Andes shape and the location of the Bolivian High in summer is also discussed. In terms of precipitation, the lowest bias in the simulations is achieved when the horizontal resolution is increased, while in particular near the Andes foothills the simulated annual rainfall is largely determined by the Mountains shape. © 2014, Springer-Verlag Berlin Heidelberg.
author	Saurral, Ramiro Ignacio Camilloni, Ines Angela
author_facet	Saurral, Ramiro Ignacio Camilloni, Ines Angela
author_sort	Saurral, Ramiro Ignacio
title	Links between topography, moisture fluxes pathways and precipitation over South America
title_short	Links between topography, moisture fluxes pathways and precipitation over South America
title_full	Links between topography, moisture fluxes pathways and precipitation over South America
title_fullStr	Links between topography, moisture fluxes pathways and precipitation over South America
title_full_unstemmed	Links between topography, moisture fluxes pathways and precipitation over South America
title_sort	links between topography, moisture fluxes pathways and precipitation over south america
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v45_n3-4_p777_Saurral http://hdl.handle.net/20.500.12110/paper_09307575_v45_n3-4_p777_Saurral
work_keys_str_mv	AT saurralramiroignacio linksbetweentopographymoisturefluxespathwaysandprecipitationoversouthamerica AT camilloniinesangela linksbetweentopographymoisturefluxespathwaysandprecipitationoversouthamerica
_version_	1768542275647832064

Links between topography, moisture fluxes pathways and precipitation over South America

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