Relationship between Land Use and Spatial Variability of Atmospheric Brown Carbon and Black Carbon Aerosols in Amazonia

dc.contributor.authorMorais, Fernando G.
dc.contributor.authorFranco, Marco A.
dc.contributor.authorPalácios, Rafael
dc.contributor.authorMachado, Luiz A. T.
dc.contributor.authorRizzo, Luciana V.
dc.contributor.authorBarbosa, H. M. J.
dc.contributor.authorJorge, Fabio
dc.contributor.authorSchafer, Joel S.
dc.contributor.authorHolben, Brent N.
dc.contributor.authorLandulfo, Eduardo
dc.contributor.authorArtaxo, Paulo
dc.date.accessioned2022-10-07T14:25:50Z
dc.date.available2022-10-07T14:25:50Z
dc.date.issued2022-08-21
dc.description.abstractThe aerosol radiative effect is an important source of uncertainty in estimating the anthropogenic impact of global climate change. One of the main open questions is the role of radiation absorption by aerosols and its relation to land use worldwide, particularly in the Amazon Rainforest. Using AERONET (Aerosol Robotic Network) long-term measurements of aerosol optical depth (AOD) at a wavelength of 500 nm and absorption AOD (AAOD) at wavelengths of 440, 675, and 870 nm, we estimated the fraction and seasonality of the black carbon (BC) and brown carbon (BrC) contributions to absorption at 440 nm. This was conducted at six Amazonian sites, from central Amazon (Manaus and the Amazon Tall Tower Observatory—ATTO) to the deforestation arc (Rio Branco, Cuiabá, Ji-Paraná, and Alta Floresta). In addition, land use and cover data from the MapBiomas collection 6.0 was used to access the land transformation from forest to agricultural areas on each site. The results showed, for the first time, important geographical and seasonal variability in the aerosol optical properties, particularly the BC and BrC contributions. We observed a clear separation between dry and wet seasons, with BrC consistently accounting for an average of approximately 12% of the aerosol AAOD at 440 nm in the deforestation arc. In central Amazon, the contribution of BrC was approximately 25%. A direct relationship between the reduction in forests and the increase in the area dedicated to agriculture was detected. Moreover, places with lower fractions of forest had a smaller fraction of BrC, and regions with higher fractions of agricultural areas presented higher fractions of BC. Therefore, significant changes in AOD and AAOD are likely related to land-use transformations and biomass burning emissions, mainly during the dry season. The effects of land use change could introduce differences in the radiative balance in the different Amazonian regions. The analyses presented in this study allow a better understanding of the role of aerosol emissions from the Amazon Rainforest that could have global impacts.en_US
dc.description.sponsorshipThis study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo FAPESP, projects 2017/17047-0 and 2021/13610-8en_US
dc.description.urihttps://www.mdpi.com/2073-4433/13/8/1328en_US
dc.format.extent17 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ocru-vdir
dc.identifier.citationMorais, Fernando G., Marco A. Franco, Rafael Palácios, Luiz A. T. Machado, Luciana V. Rizzo, Henrique M. J. Barbosa, Fabio Jorge, Joel S. Schafer, Brent N. Holben, Eduardo Landulfo, and Paulo Artaxo. 2022. "Relationship between Land Use and Spatial Variability of Atmospheric Brown Carbon and Black Carbon Aerosols in Amazonia" Atmosphere 13, no. 8: 1328. https://doi.org/10.3390/atmos13081328en_US
dc.identifier.urihttps://doi.org/10.3390/atmos13081328
dc.identifier.urihttp://hdl.handle.net/11603/26113
dc.language.isoen_USen_US
dc.publisherMDPIen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.subjectUMBC High Performance Computing Facility (HPCF)
dc.titleRelationship between Land Use and Spatial Variability of Atmospheric Brown Carbon and Black Carbon Aerosols in Amazoniaen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-4027-1855en_US

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