Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Local and remote climatic impacts due to land use degradation in the Amazon ``Arc of Deforestation{''}

Full text
Siqueira Silva, Maria Elisa ; Pereira, Gabriel ; da Rocha, Rosmeri Porfirio
Total Authors: 3
Document type: Journal article
Source: THEORETICAL AND APPLIED CLIMATOLOGY; v. 125, n. 3-4, p. 609-623, AUG 2016.
Web of Science Citations: 6

Many numerical studies, among them, global and regional models, have been used to simulate climatic impact due to Amazon deforestation. Most of them did not consider deforestation as usually observed and the induced dynamic changes. The present study explores the physical impacts due to Amazon deforestation by considering local and remote changes in the circulation and thermodynamics. For this, numerical experiments were conducted with RegCM3 using a relatively fine horizontal grid spacing (50 km), more realistic deforested areas (similar to the highway-network-shaped), and an updated land use map. The studied period was 2001-2006 October-March. As in most previous studies focusing on Amazon deforestation, the RegCM3-simulated air temperature increases over degraded areas, ranging from 1.0 to 2.5 A degrees C, and precipitation decreases of around 10 %. This result is mainly related to depletion in evapotranspiration rates provided by lesser soil water extraction by the degraded vegetation. The weakening of upward motion in the mid-upper troposphere is an associated mechanism that explains the precipitation decrease after Amazon deforestation. A new result is the simulated precipitation increase, about 10 %, over the eastern South America and the adjacent South Atlantic Ocean. In these areas, the precipitation increase during October-March is associated with intensification of upper-level high pressure (the Bolivian high) coupled with negative geopotential height anomalies southeastward of the center of the high. (AU)

FAPESP's process: 07/07834-3 - Climatic impact on South America for different scenarios of vegetation coverage
Grantee:Maria Elisa Siqueira Silva
Support type: Regular Research Grants