Seminário do Departamento de Ciências Atmosféricas
Título: Influence of Ice Production on Cloud Electrification and Lightning Activity in Simulated Thunderstorms
Apresentação: Inès Vongpaseut (LAERO, CNRS France)
Resumo:
Thunderstorms can cause severe weather, including lightning and heavy rain. However, the physical processes behind thunderstorms are not fully understood. Cloud electrification mainly results from charge separation during collisions between ice particles. Understanding interactions between electricity, microphysics, and aerosols is essential for predicting thunderstorm impacts.
This study examines how different paths of ice crystal production (through aerosols and secondary ice production) affect cloud electrification and lightning. Using the Meso-NH model with its cloud electrical scheme, three idealized storm cases were simulated.
Results show a general trend of increased cloud electrification and lightning with increased CCN and INP concentrations up to a threshold. Electrification is sensitive to the number of ice crystals, and secondary ice processes significantly affect lightning frequency depending on storm conditions.
Título: Deep convective transport and its sensitivity to organization: insights from CAFE-Brazil
Apresentação: Thibaut Dauhut (LAERO, CNRS France)
Resumo:
Title: Deep convective transport and its sensitivity to organization: insights from CAFE-Brazil
Deep convection over the Amazon varies from scattered cells to organized systems like squall lines, affecting vertical transport of forest-emitted gases, and potentially aerosols formation. During the CAFE-Brazil campaign (Dec 2022-Jan 2023), measurements from the HALO aircraft and ATTO-Campina ground site captured a squall line event on January 18.
Simulations with the Meso-NH model over a 24-hour period revealed that finer resolution led to the development of squall lines and increased convective transport, driven by larger updrafts rather than stronger ones.
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