The Chemistry CATT-BRAMS model (CCATT-BRAMS 4.5): a regional atmospheric model system for integrated air quality and weather forecasting and research

Longo, Karla M.; Freitas, Saulo R.; Pirre, Michel; Marécal, Virginie; Rodrigues, L. F.; Panetta, Jairo; Alonso, Marcelo Félix; Rosário, Nilton E.; Moreira, Demerval Soares; Gácita, Madeleine Sánchez; Arteta, Joaquim; Fonseca, Rafael M.; Stockler, R.; Katsurayama, Daniel Massaru; Fazenda, Álvaro Luiz; Béla, M.

doi:10.5194/gmd-6-1389-2013

Cited by 58 publications

(43 citation statements)

References 93 publications

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“…Consistent with previous studies (Freitas et al, 2005(Freitas et al, , 2017Longo et al, 2010Longo et al, , 2013Rosário et al, 2013;Moreira et al, 2013), BRAMS performed well while modeling the meteorology and aerosol biomass burning emission, transport, and removal processes in Amazonia, which has resulted in accurate simulation of the major features of AOD variability associated with the regional biomass burning plume over South America. The model results for surface temperature, rainfall, and AOD were once again in agreement with observations for the 2010 dry season case study, representing the main characteristics of the spatial distribution and the diurnal cycle of temperature and precipitation.…”

Section: Conclusion and Final Remarkssupporting

confidence: 84%

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

et al. 2017

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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 CO 2 fluxes at the surface. In this work, we applied a fully integrated atmospheric model to assess the impact of biomass burning aerosols in CO 2 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; 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 CO 2 fluxes, reaching a balancePublished by Copernicus Publications on behalf of the European Geosciences Union. 14786 D. S. Moreira et al.: Modeling the radiative effects of biomass burning aerosols 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 CO 2 to the atmosphere.

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Section: Conclusion and Final Remarkssupporting

confidence: 84%

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

et al. 2017

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“…Simulations of BARCA A and B were conducted with the Chemistry Coupled Aerosol-Tracer Transport model to the Brazilian developments on the Regional Atmospheric Modeling System (CCATT-BRAMS; Freitas et al, 2009;Longo et al, 2013) Fig. 3.…”

Section: Model Description and Simulation Setupmentioning

confidence: 99%

“…In WRF-Chem, the Goddard Chemistry Aerosol Radiation and Transport (GOCART; Chin et al, 2002) aerosol scheme was used with aerosol direct radiative effects. CCATT-BRAMS has a smoke aerosol scheme with intensive optical properties (extinction efficiency, single scattering albedo, and asymmetry parameter) calculated in an offline Mie code based on observations of climatological size distribution and complex refractive index from AERONET sites in the southern Amazon (Rosário, 2011;Rosário et al, 2013).…”

Section: Model Description and Simulation Setupmentioning

confidence: 99%

Ozone production and transport over the Amazon Basin during the dry-to-wet and wet-to-dry transition seasons

et al. 2015

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Abstract. The Regional Carbon Balance in Amazonia (BARCA) campaign provided the first Amazon Basin-wide aircraft measurements of ozone (O 3 ) during both the dry-towet (November and December 2008) and wet-to-dry (May 2009) transition seasons. Extremely low background values (< 20 ppb) were observed to the west and north of Manaus in both seasons and in all regions during the wet-to-dry transition. On the other hand, elevated O 3 levels (40-60 ppb) were seen during the dry-to-wet transition to the east and south of Manaus, where biomass burning emissions of O 3 precursors were present. Chemistry simulations with the CCATT-BRAMS and WRF-Chem models are within the error bars of the observed O 3 profiles in the boundary layer (0-3 km a.s.l.) in polluted conditions. However, the models overestimate O 3 in the boundary layer in clean conditions, despite lacking the predominant NO source from soil. In addition, O 3 simulated by the models was either within the error bars or lower than BARCA observations in mid-levels (3-5 km a.s.l.), and lower than total tropospheric O 3 retrieved from the OMI/MLS instruments, which is primarily comprised of middle troposphere O 3 and thus reflects long-range transport processes. Therefore, the models do a relatively poor job of representing the free troposphere-boundary layer gradient in O 3 compared with aircraft and satellite observations, which could be due to missing long-range and convective transport of O 3 at mid-levels. Additional simulations with WRF-Chem showed that the model O 3 production is very sensitive to both the O 3 deposition velocities and the NO x emissions, which were both about one-half of observed values. These results indicate the necessity of more realistic model representations of emissions, deposition, and convective processes for accurate monitoring and prediction of increases in O 3 production in the Amazon Basin as the regional population grows.

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“…To analyze the regional impacts, we used the Coupled Aerosol and Tracer Transport model to the Brazilian developments on the Regional Atmospheric Modelling System (CATT–BRAMS) model. The model comprises an atmospheric chemistry transport model (CATT) coupled online with a regional atmospheric model (BRAMS) (Longo et al , ). The CATT–BRAMS 4.3.3 model was configured with two nested domains (South America and the Rio Grande do Sul state with respectively 80 and 40 km horizontal resolution) and was initialized with the CPTEC/INPE global model T213 that provides initial and boundary conditions for the meteorological integration and the MOCAGE ( Modélisation de la Chimie Atmosphérique Grande Echelle ) global chemistry forecasting model (Josse et al , ; Bousserez et al , ) that provides boundary conditions for the chemistry fields.…”

Section: Methodsmentioning

confidence: 97%

Analysis of incoming biomass burning aerosol plumes over southern Brazil

Oliveira

Mariano

Alonso

et al. 2016

Atmospheric Science Letters

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The Chemistry CATT-BRAMS model (CCATT-BRAMS 4.5): a regional atmospheric model system for integrated air quality and weather forecasting and research

Cited by 58 publications

References 93 publications

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

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

Ozone production and transport over the Amazon Basin during the dry-to-wet and wet-to-dry transition seasons

Analysis of incoming biomass burning aerosol plumes over southern Brazil

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