Banca de DEFESA: ANA LETICIA MELO DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANA LETICIA MELO DOS SANTOS
DATE: 26/02/2021
TIME: 16:30
LOCAL: VIDEOCONFERÊNCIA
TITLE:

INFLUENCE OF JET CURRENT CONNECTIONS BETWEEN
HEMISPHERES IN THE FORMATION OF METEOROLOGICAL PHENOMENA
ADVERSE EVENTS IN NORTHEASTERN BRAZIL

KEY WORDS:

Jet Stream of Northeast Brazil. Interhemispheric link. Adverse phenomena.

PAGES: 94
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

Brazilian Northeast Jet Streams (BNEJS) are the main Jet Stream (JS) that influence throughout Brazilian Northeast (BNE), but their connections with adverse phenomena have not yet been studied. Adverse phenomena directly influence society with the formation of fogs and mists in the stable atmosphere and thunderstorms and heavy rain in the unstable atmosphere. These phenomena cause a lot of damage to the population, for example, affect flight safety. Research aims were to study the influence of BNEJS connections with both Northern (NH) and Southern (SH) Hemispheres in the formation of adverse meteorological phenomena in the BNE. The study was carried out from 2017 to 2019. The data from NCEP-DOE Reanalysis 2, with a resolution of 2.5°x2.5 ° at the level of 200 hPa were used in this study. The adverse meteorological phenomena information was obtained from the REDMET database of the API application of all BNE capitals. All BNEJS were divided into three circulation patterns: Southern, Zonal and Transversal. Examples of the Southern, Zonal and Transversal events are presented in detail with the analysis of the Geopotential Height (Ag) at the level of 200 hPa. The adverse phenomena recorded were identified according to their position at the entrance (hot and cold side) and exit (hot and cold side) of the BNEJS. Connections between hemispheres were identified and quantified: the BNEJS links with other JSs types (Subtropical Jet Stream-STJS and Polar Jet Stream-PJS) were detected. BNEJS were identified every month. Connections between the hemispheres were detected mainly in the coldest months of SH during study years. Analysis of the Southern, Zonal and Transversal processes showed that Transversal processes occurred more frequently than others. The most frequent links were BNEJS + STJSSH + PJSSH, BNEJS + STJSNH + PJSNH and BNEJS without connections were also often observed. The most frequent phenomena were light rain, thunderstorm with light rain and humid mist. Adverse phenomena were more frequent in the transverse process (hot side of entrance and cold side of exit of the CJNEB). Thunderstorm occurred mainly at airports in the north of the BNE.

BANKING MEMBERS:
Externo à Instituição - JOÃO DE ATHAYDES SILVA JUNIOR - UFPA
Interno - 4421297 - HELIOFABIO BARROS GOMES
Externa à Instituição - MICEJANE DA SILVA COSTA - UFRN
Presidente - 1099304 - NATALIA FEDOROVA
Interno - 2227105 - VLADIMIR LEVIT