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CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials CR 55:33-51 (2012) - DOI: https://doi.org/10.3354/cr01119 Effects of land-use changes on climate in southern South America Natalia L. Pessacg1,*, Silvina Solman2 1Centro Nacional Patagónico (CENPAT/CONICET), Puerto Madryn, Chubut U9120ACF, Argentina 2Centro de Investigaciones del Mar y la Atmósfera (CIMA/CONICET-UBA), DCAO/FCEN, UMI IFAECI/CNRS, Buenos Aires C1428EGA, Argentina *Email: pessacg@cenpat.edu.ar ABSTRACT: 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. KEY WORDS: Land use/land cover · Southern South America · Regional climate model · Feedbacks soil−atmosphere Full text in pdf format PreviousNextCite this article as: Pessacg NL, Solman S (2012) Effects of land-use changes on climate in southern South America. Clim Res 55:33-51. https://doi.org/10.3354/cr01119 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in CR Vol. 55, No. 1. Online publication date: November 15, 2012 Print ISSN: 0936-577X; Online ISSN: 1616-1572 Copyright © 2012 Inter-Research.
Deforestation
Reforestation
Desertification
Land Cover
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