4 Biomass burning CCN enhance the dynamics of a mesoscale convective system over the La Plata Basin: a numerical approach

Autor(es)

Camponogara, Glauber ^[1] ; da Silva Dias, Maria Assuncao Faus ^[1] ; Carrio, Gustavo G. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo - Brazil

^[2] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 - USA

• Tipo de documento: Artigo Científico
• Fonte: Atmospheric Chemistry and Physics; v. 18, n. 3, p. 2081-2096, FEB 13 2018.
• Citações Web of Science: 0

Resumo

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 (MCSs), 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 cloud condensation nuclei (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. (AU)

• Processo FAPESP: 14/05351-9 - Interação entre aerossóis de queimadas na Amazônia e sistemas convectivos de mesoescala na Bacia do Prata
• Beneficiário: Gláuber Camponogara
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 12/08115-9 - Interação entre aerossóis de queimadas na Amazônia e sistemas convectivos de mesoescala na Bacia do Prata: um estudo numérico assimilando dados dos projetos Chuva e Aeroclima
• Beneficiário: Gláuber Camponogara
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/15235-8 - Processos de nuvens associados aos principais sistemas precipitantes no Brasil: uma contribuição à modelagem da escala de nuvens e ao GPM (Medida Global de Precipitação)
• Beneficiário: Luiz Augusto Toledo Machado
• Modalidade de apoio: Auxílio à Pesquisa - Temático