A potential vorticity perspective on cyclones over South America

Abstract

Primeiramente, agradeço a mim, por ter chegado até aqui. =) Agradeço à minha família por todo apoio e compreensão, principalmente por eu ter estado/ainda estar longe de casa há mais de 8 anos; à minha orientadora, Rosmeri Porfírio da Rocha, por ter aceitado me orientar por todos estes anos e não desistir de mim, por fazer ciência de qualidade e não desistir dela nunca; aos colegas e amigos, novos e de longa data

Ciclones Extratropicais No Hemisfério Sul: Comparação Entre Diferentes Reanálises

“…In general, the latitude belt between 50º and 70ºS is the most cyclogenetic region of the SH (Figure 7). However, there are two sectors within this belt with the highest cyclones frequency: one at around 170ºE and the other at the east of the Antarctic Peninsula, which was also obtained by Crespo (2019). Only NCEP20C (Figure 7f, l) shows a difference in this characteristic, that is, more cyclones to the west of the Peninsula than to the east.…”

“…For example, Vessey et al (2020) found fewer cyclones in the Arctic using MSLP rather than vorticity, and this difference reaches almost 50% from December to February. Crespo (2019), comparing two cyclone climatologies using ERAI for the period 1979 to 2017, one obtained with MSLP data and the other with the relative vorticity of the wind at 925 hPa, found that the cyclogenetic density obtained with the two variables is similar in subtropical regions, over the continent and close to the coast. However, at mid-latitudes, there is a higher frequency of cyclones when using relative vorticity.…”