Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 22
Articles | Volume 25, issue 22
https://doi.org/10.5194/acp-25-15935-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-15935-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 22
Research article
 | 
18 Nov 2025
Research article |  | 18 Nov 2025

Biomass burning smoke transport and radiative impact over the city of São Paulo: an extreme event case study

Jorge Rosas Santana, Gabriela Lima da Silva, Marcia Akemi Yamasoe, and Nilton Èvora do Rosario

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Short summary
This study examines a rare event in São Paulo, Brazil, where wildfire smoke from South America mixed with clouds, causing midday darkness on 19 August 2019. Satellite data, surface measurements and air mass modeling tracked the smoke from fires in Brazil, Bolivia and Paraguay, transported to São Paulo within 2 d. The smoke–cloud interaction reduced surface irradiance to zero for 40 min and increased radiative efficiency by 7 %, highlighting impacts on air quality and radiation budget.
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