scholarly journals Regional simulations of deep convection and biomass burning over South America: 2. Biomass burning aerosol effects on clouds and precipitation

2011 ◽  
Vol 116 (D17) ◽  
Author(s):  
Longtao Wu ◽  
Hui Su ◽  
Jonathan H. Jiang
Keyword(s):  
South America ◽  
Biomass Burning ◽  
Deep Convection ◽  
Biomass Burning Aerosol ◽  
Aerosol Effects

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

2017 ◽  
Vol 17 (23) ◽  
pp. 14785-14810 ◽  
Author(s):  
Demerval S. Moreira ◽  
Karla M. Longo ◽  
Saulo R. Freitas ◽  
Marcia A. Yamasoe ◽  
Lina M. Mercado ◽  
...  
Keyword(s):  
Solar Radiation ◽  
South America ◽  
Biomass Burning ◽  
Radiation Effect ◽  
Diffuse Radiation ◽  
Amazon Region ◽  
Co2 Fluxes ◽  
Biomass Burning Aerosol ◽  
Aerosol Effects ◽  
The Impact

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 atmospheric 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; 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.

Dust and biomass burning aerosol transport in South Atlantic during AEROCLO-sA

2020 ◽  
Author(s):  
Jean-Pierre Chaboureau ◽  
Laurent Labbouz ◽  
Cyrille Flamant ◽  
Alma Hodzic
Keyword(s):  
Biomass Burning ◽  
Deep Convection ◽  
Dust Emission ◽  
South Atlantic ◽  
Congo Basin ◽  
Lagrangian Analysis ◽  
Fire Emissions ◽  
On Line ◽  
Biomass Burning Aerosol ◽  
Convection Parameterization

<p>We investigate the transport of dust and biomass burning aerosols in South Atlantic during the Aerosols, Radiation and Clouds in southern Africa (AEROCLO-sA) campaign in September 2017. A regional Meso-NH simulation has been run using a 12-km horizontal grid-spacing without deep convection parameterization, an on-line dust emission scheme, a passive tracer of biomass burning aerosol (BBA) emitted using the daily Global Fire Emissions Database and online-computed backward trajectories. The simulation captures both the aerosol optical depth and the vertical distribution of aerosols as observed from airborne and spaceborne lidars. It also reproduces the occurrence of deep convection over Congo and stratocumulus over South Atlantic well. A Lagrangian analysis reveals the origin of aerosols in the South Atlantic. Dust aerosols found just above the stratocumulus were emitted from the coasts and the Ethosha Pan a few days earlier. The BBAs located between 1 and 5 km come mainly from Angola in about 3.5 days. The 8-12 km layer is fed by up to 12 % of the air masses that experienced convection over the Congo Basin in the last 5 days. This amount is much reduced in the sensitivity simulation with a deep convection parameterization.</p>

scholarly journals Aerosol Characterization during the Summer 2017 Huge Fire Event on Mount Vesuvius (Italy) by Remote Sensing and In Situ Observations

2021 ◽  
Vol 13 (10) ◽  
pp. 2001
Author(s):  
Antonella Boselli ◽  
Alessia Sannino ◽  
Mariagrazia D’Emilio ◽  
Xuan Wang ◽  
Salvatore Amoruso
Keyword(s):  
Remote Sensing ◽  
Biomass Burning ◽  
Ground Level ◽  
Large Area ◽  
Fire Event ◽  
Near Surface ◽  
Mean Values ◽  
Microphysical Properties ◽  
Observational Site ◽  
Biomass Burning Aerosol

During the summer of 2017, multiple huge fires occurred on Mount Vesuvius (Italy), dispersing a large quantity of ash in the surrounding area ensuing the burning of tens of hectares of Mediterranean scrub. The fires affected a very large area of the Vesuvius National Park and the smoke was driven by winds towards the city of Naples, causing daily peak values of particulate matter (PM) concentrations at ground level higher than the limit of the EU air quality directive. The smoke plume spreading over the area of Naples in this period was characterized by active (lidar) and passive (sun photometer) remote sensing as well as near-surface (optical particle counter) observational techniques. The measurements allowed us to follow both the PM variation at ground level and the vertical profile of fresh biomass burning aerosol as well as to analyze the optical and microphysical properties. The results evidenced the presence of a layer of fine mode aerosol with large mean values of optical depth (AOD > 0.25) and Ångstrom exponent (γ > 1.5) above the observational site. Moreover, the lidar ratio and aerosol linear depolarization obtained from the lidar observations were about 40 sr and 4%, respectively, consistent with the presence of biomass burning aerosol in the atmosphere.

scholarly journals Analysis of incoming biomass burning aerosol plumes over southern Brazil

2016 ◽  
Vol 17 (11) ◽  
pp. 577-585 ◽  
Author(s):  
Aline Macedo de Oliveira ◽  
Glauber Lopes Mariano ◽  
Marcelo Félix Alonso ◽  
Ericka Voss Chagas Mariano
Keyword(s):  
Biomass Burning ◽  
Southern Brazil ◽  
Biomass Burning Aerosol
Sign in / Sign up

Export Citation Format

Share Document