Avaliação da precipitação e dos padrões físicos e morfológicos das Linhas de Instabilidade e a relação com o Gradiente Inter-Hemisférico do Atlântico Tropical
Rainfall is a variable that requires a lot of studies about it. In South America, the Amazon region stands out due to large accumulations of precipitation in some periods of the year, with some meteorological systems such as the Squall Lines (LI), acting as modulators of these precipitation accumula...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/40274 |
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| Resumo: | Rainfall is a variable that requires a lot of studies about it. In South America, the Amazon region stands out due to large accumulations of precipitation in some periods of the year, with some meteorological systems such as the Squall Lines (LI), acting as modulators of these precipitation accumulations. Moreover, precipitation can be influenced by the Sea Surface Temperature of the tropical oceans. For example, there is the tropical Atlantic Ocean, which is represented by the dipole mode, or Inter-Hemispheric Gradient of Temperature Anomalies of the Tropical Atlantic Sea Surface (GRADATL). In view of this, this present work studied aspects of the Squall Lines and the rainfall variability associated with them and the possible relation of the occurrence and the intensity of the LIs with GRADATL. Analyzed 3 years with the performance of GRADATL in a positive phase and 3 years in GRADATL phase negative on the Northeast of the Amazon and North of the Northeast of Brazil. Geostationary satellite data and TRMM satellite data were used to achieve the objectives. The LIs were identified from the eccentricity and slope of the systems, being denominated as Linear Systems (SL). SL are those with eccentricity value less than or equal to 0.2 and slope less than zero. The conclusion is that the amount of SL was lower in the GRADATL negative phase years. Regarding the physical and morphological aspects, there is no difference between the years of positive and negative GRADATL. When assessing the precipitation distribution of the relationship between precipitation caused by SL and precipitation caused by all systems, in 2004 (GRADATL positive) SLs manifested well, causing high rainfall indexes. Finally, there is an indication that GRADATL does not significantly influence the physical and morphological characteristics. |
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