Large-scale commodity agriculture exacerbates the climatic impacts of Amazonian deforestation

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Maeda , E , Abera , T , Siljander , M , Aragão , L E O C , Mendes de Moura , Y & Heiskanen , J 2021 , ' Large-scale commodity agriculture exacerbates the climatic impacts of Amazonian deforestation ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 118 , no. 7 , 2023787118 . https://doi.org/10.1073/pnas.2023787118

Title: Large-scale commodity agriculture exacerbates the climatic impacts of Amazonian deforestation
Author: Maeda, Eduardo; Abera, Temesgen; Siljander, Mika; Aragão, Luiz E. O. C.; Mendes de Moura, Yhasmin; Heiskanen, Janne
Other contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Earth Change Observation Laboratory (ECHOLAB)
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)




Date: 2021-02-16
Language: eng
Number of pages: 10
Belongs to series: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
DOI: https://doi.org/10.1073/pnas.2023787118
URI: http://hdl.handle.net/10138/333163
Abstract: In the Amazon rainforest, land use following deforestation is diverse and dynamic. Mounting evidence indicates that the climatic impacts of forest loss can also vary considerably, depending on specific features of the affected areas. The size of the deforested patches, for instance, was shown to modulate the characteristics of local climatic impacts. Nonetheless, the influence of different types of land use and management strategies on the magnitude of local climatic changes remains uncertain. Here, we evaluated the impacts of large-scale commodity farming and rural settlements on surface temperature, rainfall patterns, and energy fluxes. Our results reveal that changes in land-atmosphere coupling are induced not only by deforestation size but also, by land use type and management patterns inside the deforested areas. We provide evidence that, in comparison with rural settlements, deforestation caused by large-scale commodity agriculture is more likely to reduce convective rainfall and increase land surface temperature. We demonstrate that these differences are mainly caused by a more intensive management of the land, resulting in significantly lower vegetation cover throughout the year, which reduces latent heat flux. Our findings indicate an urgent need for alternative agricultural practices, as well as forest restoration, for maintaining ecosystem processes and mitigating change in the local climates across the Amazon basin.
Subject: ALGORITHM
Amazon forest
ECOSYSTEM
LAND-SURFACE TEMPERATURE
MATO-GROSSO
MULTIYEAR
PERFORMANCE
SPACE
TIME
VALIDATION
VEGETATION
agricultural expansion
deforestation
land use
regional climate
4111 Agronomy
1171 Geosciences
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