Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region

Show simple item record Moreira, Demerval S. Longo, Karla M. Freitas, Saulo R. Yamasoe, Marcia A. Mercado, Lina M. Rosario, Nilton E. [UNIFESP] Gloor, Emauel Viana, Rosane S. M. Miller, John B. Gatti, Luciana V. Wiedemann, Kenia T. Domingues, Lucas K. G. Correia, Caio C. S. 2020-07-02T18:52:19Z 2020-07-02T18:52:19Z 2017
dc.identifier.citation Atmospheric Chemistry And Physics. Gottingen, v. 17, n. 23, p. 14785-14810, 2017.
dc.identifier.issn 1680-7316
dc.description.abstract Every year, a dense smoke haze covers a large portion of South America originating from fires in the Amazon Basin and central parts of Brazil during the dry biomass burning season between August and October. Over a large portion of South America, the average aerosol optical depth at 550 nm exceeds 1.0 during the fire season, while the background value during the rainy season is below 0.2. Biomass burning aerosol particles increase scattering and absorption of the incident solar radiation. The regional-scale aerosol layer reduces the amount of solar energy reaching the surface, cools the near-surface air, and increases the diffuse radiation fraction over a large disturbed area of the Amazon rainforest. These factors affect the energy and CO2 fluxes at the surface. In this work, we applied a fully integrated at-mospheric model to assess the impact of biomass burning aerosols in CO2 fluxes in the Amazon region during 2010. We address the effects of the attenuation of global solar radiation and the enhancement of the diffuse solar radiation flux inside the vegetation canopy. Our results indicate that biomass burning aerosols led to increases of about 27% in the gross primary productivity of Amazonia and 10% in plant respiration as well as a decline in soil respiration of 3%. Consequently, in our model Amazonia became a net carbon sink en
dc.description.abstract net ecosystem exchange during September 2010 dropped from +101 to -104 TgC when the aerosol effects are considered, mainly due to the aerosol diffuse radiation effect. For the forest biome, our results point to a dominance of the diffuse radiation effect on CO2 fluxes, reaching a balance of 50-50% between the diffuse and direct aerosol effects for high aerosol loads. For C3 grasses and savanna (cerrado), as expected, the contribution of the diffuse radiation effect is much lower, tending to zero with the increase in aerosol load. Taking all biomes together, our model shows the Amazon during the dry season, in the presence of high biomass burning aerosol loads, changing from being a source to being a sink of CO2 to the atmosphere. en
dc.format.extent 14785-14810
dc.language.iso eng
dc.publisher Copernicus Gesellschaft Mbh
dc.relation.ispartof Atmospheric Chemistry And Physics
dc.rights Acesso aberto
dc.title Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region en
dc.type Artigo
dc.description.affiliation Univ Estadual Paulista UNESP, Fac Ciencias, Bauru, SP, Brazil
dc.description.affiliation Ctr Meteorol Bauru IPMet, Bauru, SP, Brazil
dc.description.affiliation INPE, Ctr Previsao Tempo & Estud Climaticos, Cachoeira Paulista, SP, Brazil
dc.description.affiliation Univ Sao Paulo, Dept Ciencias Atmosfer, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo, SP, Brazil
dc.description.affiliation Univ Exeter, Coll Life & Environm Sci, Geog, Exeter, Devon, England
dc.description.affiliation CEH, Wallingford, Oxon, England
dc.description.affiliation Univ Fed Sao Paulo UNIFESP, Campus Diadema, Diadema, SP, Brazil
dc.description.affiliation Univ Leeds, Sch Geog, Woodhouse Lane, Leeds, W Yorkshire, England
dc.description.affiliation Univ Fed Vicosa, Dept Matemat, Vicosa, MG, Brazil
dc.description.affiliation NOAA, Earth Syst Res Lab, Global Monitoring Div, Boulder, CO 80305 USA
dc.description.affiliation INPE, Ctr Ciencias Sistema Terrestre, Sao Jose Dos Campos, SP, Brazil
dc.description.affiliation CNEN, IPEN, Sao Paulo, Brazil
dc.description.affiliation Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ USA
dc.description.affiliation NASA, Goddard Space Flight Ctr, Global Modeling & Assimilat Off, USRA GESTAR, Greenbelt, MD USA
dc.description.affiliationUnifesp Univ Fed Sao Paulo UNIFESP, Campus Diadema, Diadema, SP, Brazil
dc.identifier.file WOS000417753400003.pdf
dc.identifier.doi 10.5194/acp-17-14785-2017
dc.description.source Web of Science
dc.identifier.wos WOS:000417753400003
dc.coverage Gottingen
dc.citation.volume 17
dc.citation.issue 23


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