Controles climáticos sobre a variação temporal da composição isotópica na região central do estado de São Paulo

• Autor(a) principal: Gomes, Rafaela Rodrigues
• Data de Publicação: 2022
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/217084
• topic: Stable isotopes; Precipitation; Climate modeling; Isótopos; Climatologia; Precipitação; Isótopos estáveis; Modelagem climática

Stable isotopes of oxygen (16O/17O /18O) and hydrogen (1H/2H) in the water molecule are used as a tool for climate analysis, because they can help to obtain hydrometeorological information about the origin and formation of rain events. Therefore, each rain event is influenced by climatic parameters related to the steam source and precipitation trajectory. Given the need for studies on the subject in tropical zones, the singular regime that affect the Southeast region is an excellent research field, since it reflects the dynamic of atmospheric systems that are driven by climatic differences between the equatorial zone and the polar zone. According to those lines, the present study consists in 192 samples of surface meteorological data and the isotopic composition, weekly sampled from Feb/2014 to Dec/2020. Along with the data obtained, the origin and trajectories of the air masses that generated the rainfall over the time interval were provided from HYSPLIT, which enabled the generation of thematic maps. Microsoft Excel © and BioEstat v.5.0 © software were used to verify which climatic parameters influence the isotopic composition of the precipitation, based on a series of tests and statistical graphs. With the analysis, it was possible to consider that rainfall with light isotopes is related to the rainy season and is strongly influenced by steam recirculation in the Amazon region, originating in latitudes close to the Equator. While the rains with heavy isotopes occur more frequently in the dry season and present trajectories that pass through the central-southern region of Brazil and origins located in the South Atlantic.