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Influence of the semiannual oscillation to precipitation and lower pressure center in the Southeast of Brazil

Grant number: 17/17339-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2017
Effective date (End): October 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Meteorology
Principal Investigator:Clara Miho Narukawa Iwabe
Grantee:Isabella Talamoni Lima
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

The Southern Hemisphere Semi-Annual Oscillation (SAO) is an oscillation identified in mean sea level pressure and air temperature in the latitudes of 50° S and 65°S or in the temperature gradient in 500 hPa between these two latitudes. Its oscillation presents two maxima, one in the autumn and another in the spring, and the minimum, one in the summer and another in the winter. On the surface, from March to June and from September to October exhibits a pattern of expansion/weakening of the trough around the Antarctica, while from June to September and from December to March exhibits a contraction/intensification of the polar circle of lower pressure. Some studies show that SAO is directly or indirectly related to the increase or decrease of baroclinicity in the medium and high latitudes of the Southern Hemisphere and that the maximum peak of baroclinicity coincides with one of the months of peak in the temperature gradient and minimum of pressure on sea level pressure. Thus, the objective of this project is to verify the impact of SAO on the precipitation and the performance of lower pressure centers on the Southeast region of Brazil. To reach this objective, the student will work with climatological data, programming of algorithms and time series analysis, as well as acquiring knowledge in climatology and dynamics of synoptic phenomena of large scale. (AU)