Effects of land-use changes on climate in southern South America

In the last decades, the agricultural areas over La Plata Basin and the Argentinean Pampas have been extended deforestation. With the aim of understanding the potential impacts of land-use changes over the South American climate, several simulations with the regional climate model MM5 were carried o...

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Autores principales: Pessacg, Natalia Liz, Solman, Silvina Alicia
Publicado: 2012
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v55_n1_p33_Pessacg
http://hdl.handle.net/20.500.12110/paper_0936577X_v55_n1_p33_Pessacg
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spelling paper:paper_0936577X_v55_n1_p33_Pessacg2023-06-08T15:53:17Z Effects of land-use changes on climate in southern South America Pessacg, Natalia Liz Solman, Silvina Alicia Feedbacks soil-atmosphere Land use/land cover Regional climate model Southern South America Agricultural areas Agricultural expansion Argentina Bare soils La Plata basin Land cover Land use/land cover Land-use change Land-use scenario Moisture flux convergences Net radiation Nonlocal Paraguay Potential impacts Regional climate models Regional response Roughness length Sensible heat flux South America Climate models Climatology Crops Deforestation Land use Reforestation Soils Heat flux bare soil climate change climate effect climate feedback climate modeling cooling deforestation desertification land cover land use change latent heat flux nature-society relations net radiation precipitation (climatology) regional climate sensible heat flux warming Argentina La Plata Basin Pampas In the last decades, the agricultural areas over La Plata Basin and the Argentinean Pampas have been extended deforestation. With the aim of understanding the potential impacts of land-use changes over the South American climate, several simulations with the regional climate model MM5 were carried out for different idealized land-use scenarios representing agricultural expansion, reforestation and desertification, respectively. Results show a significant warming and drying when forests were replaced by bare soils due to an increase in the net radiation budget and a reduction in the latent heat flux. However, the replacement of forests by crops resulted in a decrease in the net radiation budget at the surface, together with a decrease in the latent and sensible heat fluxes, leading to a significant cooling over central and eastern Argentina and drying over Bolivia and western Paraguay. Finally, the shift from the actual land cover to crops produced a cooling and wetting mainly over northern Argentina, Paraguay and part of Bolivia due to a decrease in the net radiation budget and sensible heat flux and an increase in the latent heat flux. The regional response for these idealized scenarios exceeds the area where the land-use was changed, indicating that non-local mechanisms are important. A reduction in the roughness length when forest is replaced by either crops or bare soil leads to an increase in the northerly winds, which modifies the moisture flux convergence patterns and hence affects precipitation. © Inter-Research 2012. Fil:Pessacg, N.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Solman, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v55_n1_p33_Pessacg http://hdl.handle.net/20.500.12110/paper_0936577X_v55_n1_p33_Pessacg
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Feedbacks soil-atmosphere
Land use/land cover
Regional climate model
Southern South America
Agricultural areas
Agricultural expansion
Argentina
Bare soils
La Plata basin
Land cover
Land use/land cover
Land-use change
Land-use scenario
Moisture flux convergences
Net radiation
Nonlocal
Paraguay
Potential impacts
Regional climate models
Regional response
Roughness length
Sensible heat flux
South America
Climate models
Climatology
Crops
Deforestation
Land use
Reforestation
Soils
Heat flux
bare soil
climate change
climate effect
climate feedback
climate modeling
cooling
deforestation
desertification
land cover
land use change
latent heat flux
nature-society relations
net radiation
precipitation (climatology)
regional climate
sensible heat flux
warming
Argentina
La Plata Basin
Pampas
spellingShingle Feedbacks soil-atmosphere
Land use/land cover
Regional climate model
Southern South America
Agricultural areas
Agricultural expansion
Argentina
Bare soils
La Plata basin
Land cover
Land use/land cover
Land-use change
Land-use scenario
Moisture flux convergences
Net radiation
Nonlocal
Paraguay
Potential impacts
Regional climate models
Regional response
Roughness length
Sensible heat flux
South America
Climate models
Climatology
Crops
Deforestation
Land use
Reforestation
Soils
Heat flux
bare soil
climate change
climate effect
climate feedback
climate modeling
cooling
deforestation
desertification
land cover
land use change
latent heat flux
nature-society relations
net radiation
precipitation (climatology)
regional climate
sensible heat flux
warming
Argentina
La Plata Basin
Pampas
Pessacg, Natalia Liz
Solman, Silvina Alicia
Effects of land-use changes on climate in southern South America
topic_facet Feedbacks soil-atmosphere
Land use/land cover
Regional climate model
Southern South America
Agricultural areas
Agricultural expansion
Argentina
Bare soils
La Plata basin
Land cover
Land use/land cover
Land-use change
Land-use scenario
Moisture flux convergences
Net radiation
Nonlocal
Paraguay
Potential impacts
Regional climate models
Regional response
Roughness length
Sensible heat flux
South America
Climate models
Climatology
Crops
Deforestation
Land use
Reforestation
Soils
Heat flux
bare soil
climate change
climate effect
climate feedback
climate modeling
cooling
deforestation
desertification
land cover
land use change
latent heat flux
nature-society relations
net radiation
precipitation (climatology)
regional climate
sensible heat flux
warming
Argentina
La Plata Basin
Pampas
description In the last decades, the agricultural areas over La Plata Basin and the Argentinean Pampas have been extended deforestation. With the aim of understanding the potential impacts of land-use changes over the South American climate, several simulations with the regional climate model MM5 were carried out for different idealized land-use scenarios representing agricultural expansion, reforestation and desertification, respectively. Results show a significant warming and drying when forests were replaced by bare soils due to an increase in the net radiation budget and a reduction in the latent heat flux. However, the replacement of forests by crops resulted in a decrease in the net radiation budget at the surface, together with a decrease in the latent and sensible heat fluxes, leading to a significant cooling over central and eastern Argentina and drying over Bolivia and western Paraguay. Finally, the shift from the actual land cover to crops produced a cooling and wetting mainly over northern Argentina, Paraguay and part of Bolivia due to a decrease in the net radiation budget and sensible heat flux and an increase in the latent heat flux. The regional response for these idealized scenarios exceeds the area where the land-use was changed, indicating that non-local mechanisms are important. A reduction in the roughness length when forest is replaced by either crops or bare soil leads to an increase in the northerly winds, which modifies the moisture flux convergence patterns and hence affects precipitation. © Inter-Research 2012.
author Pessacg, Natalia Liz
Solman, Silvina Alicia
author_facet Pessacg, Natalia Liz
Solman, Silvina Alicia
author_sort Pessacg, Natalia Liz
title Effects of land-use changes on climate in southern South America
title_short Effects of land-use changes on climate in southern South America
title_full Effects of land-use changes on climate in southern South America
title_fullStr Effects of land-use changes on climate in southern South America
title_full_unstemmed Effects of land-use changes on climate in southern South America
title_sort effects of land-use changes on climate in southern south america
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v55_n1_p33_Pessacg
http://hdl.handle.net/20.500.12110/paper_0936577X_v55_n1_p33_Pessacg
work_keys_str_mv AT pessacgnatalializ effectsoflandusechangesonclimateinsouthernsouthamerica
AT solmansilvinaalicia effectsoflandusechangesonclimateinsouthernsouthamerica
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