Seasonal and time distribution of rainfall in Caraguatatuba-SP and extreme events occurring in the years 2007 to 2011
DOI:
https://doi.org/10.5902/2179460X11891Keywords:
Rainfall, seasonality, extreme eventsAbstract
http://dx.doi.org/10.5902/2179460X11891
Precipitation is the most important climate attribute in studying tropical regions. The rainfall regime in the region Caraguatatuba, North Coast of São Paulo is influenced by latitude, humidity coming from the ocean and the Serra do Mar, providing precipitation resulting from the orographic effect and changing the offset frontal systems. This study aims to analyze the seasonality of rainfall and time distribution, in the years 2007 to 2011, verifying the presence of extreme events, higher than 40 mm in 24 hours, in this period. We used a set of data provided by the Sistema Nacional de Dados Ambientais (Sinda/INPE), Bulletins Climanálise, satellite pictures and synoptic charts. The results show that the rains are concentrated in the late afternoon and early evening in the summer period. The displacement of the frontal systems occurs through the day and duration of the rainfall takes place according to the intensity of the systems during the autumn period. Time series evaluated, there were nine events with rainfall above 40 mm daily, six in summer and three in the autumn. In summer these extreme events were associated with South Atlantic Convergence Zone (SACZ) and in the autumn associated with frontal systems. Seasonally, precipitation occurs on average 64.4% in spring and summer and 35.6% in autumn and winter.Downloads
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