The South American Tropopause Aerosol Layer (SATAL) over the Amazon basin
| Autor: | Bresciani, C., Herdies, D., Figueroa, S., da Silva, A., Buchard, V., Jones, C., Carvalho, L. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-2497 |
| Popis: | This study identified the presence of the aerosol layer in the upper troposphere/lower stratosphere (UT/LS) in South America, called the South American Tropopause Aerosol Layer (SATAL). For that, it was used MERRA-2 aerosol data instead of CALIPSO data, which is unavailable for the tropical South America region. Our results from MERRA-2 show clearly the presence of the SATAL over South America, specifically over the Amazon Basin at around 16-18 km height, with seasonal behavior like the ATAL and NATAL (over Asia region and North America, respectively). It is present from October to March, coincident with the wet season period over South America. SATAL is formed first in the eastern Amazon Basin in October, then moved westward to the Southern Amazon, where it weakens in January and finally dissipates in February-March. On the origin of SATAL at UT/LS, we hypothesize that there are two main factors for SATAL formation. First, the source of aerosols in the lower troposphere and second, the updraft mass flux from the convective activity during the active phase of the South American Monsoon System (SAMS). Nevertheless, questions about its origin and relation with SAMS, droughts, and its influence on remote regions through high levels are open. It is necessary to use observational and modeling studies to answer these questions. We hope that the observation CAFE-Brazil experiment could provide helpful information to confirm the existence of SATAL and find the origin of aerosols in the lower troposphere during the rainy season. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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