Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-227
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
12 Apr 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Biomass burning CCNs enhance the dynamics of a Mesoscale Convective System over the La Plata Basin: a numerical approach
Gláuber Camponogara1, Maria Assunção Faus Silva Dias1, and Gustavo G. Carrió2 1Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, Brazil
2Department of Atmospheric Sciences of Colorado State University, USA
Abstract. High aerosol loadings are discharged into the atmosphere every year by biomass burning in the Amazon and Central Brazil during the dry season (July–December). These particles, suspended in the atmosphere, can be carried via a low level jet toward the La Plata Basin, one of the largest hydrographic basins in the world. Once they reach this region, the aerosols can affect mesoscale convective systems (MCS), whose frequency is higher during the spring and summer over the basin. The present study is one of the first that seeks to understand the microphysical effects of biomass burning aerosols from the Amazon Basin on mesoscale convective systems over the La Plata Basin. We performed numerical simulations initialized with idealized CCN profiles for an MCS case observed over the La Plata Basin on 21 September 2010. The experiments reveal an important link between CCN number concentration and MCS dynamics, where stronger downdrafts were observed under higher amounts of aerosols, generating more updraft cells in response. Moreover, the simulations show higher amounts of precipitation as the CCN concentration increases. Despite the model’s uncertainties and limitations, these results represent an important step toward the understanding of possible impacts on the Amazon biomass burning aerosols over neighboring regions such as the La Plata Basin.

Citation: Camponogara, G., Silva Dias, M. A. F., and Carrió, G. G.: Biomass burning CCNs enhance the dynamics of a Mesoscale Convective System over the La Plata Basin: a numerical approach, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-227, in review, 2017.
Gláuber Camponogara et al.
Gláuber Camponogara et al.
Gláuber Camponogara et al.

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Short summary
This study is one of the first that seeks to understand the microphysical effects of biomass burning aerosols from the Amazon Basin on mesoscale convective systems over the La Plata Basin (neighboring region). We observed an important link between biomass burning aerosols from the Amazon Basin on mesoscale convective systems over the La Plata Basin, throughout numerical simulations. This result is an important step toward the understanding of the Amazon biomass burning impacts.
This study is one of the first that seeks to understand the microphysical effects of biomass...
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