Banca de QUALIFICAÇÃO: DAVIDSON LIMA DE MELO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : DAVIDSON LIMA DE MELO
DATE: 26/05/2023
TIME: 09:00
LOCAL: videoconferência
TITLE:

INFLUENCE OF ROSSBY WAVES ON THE FORMATION OF ADVERSE PHENOMENA IN THE
BRAZILIAN NORTHEAST.

KEY WORDS:

Rossby waves, ITCZ, Brazilian Northeast.

PAGES: 79
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Meteorologia
SUMMARY:

The Rossby wave is one of the factors contributing to the incursion of frontal
zones into the equatorial Atlantic. This study is aimed at improving the forecasting of
adverse meteorological phenomena, the formation of which is associated with
atmospheric conditions and synoptic systems characteristic of the region. Precipitation
information was obtained from radar images and conventional surface data. Synoptic
scale systems were analyzed using satellite imagery provided by the Global ISCCP B1
Browse System (GIBBS), complemented with various meteorological fields from the ERA5
- ECMWF ReAnalysis v.5 model (0.25° x 0.25° spatial resolution). The meridional shape of
the Rossby waves allows the identification of the incursion of frontal systems into the
tropical region. The union of frontal extremities of the Rossby waves with the
Intertropical Convergence Zone (ITCZ) was identified in the Amazon region and Brazilian
Northeast (BNE). These fronts showed the structure of the cold front extremity,
secondary and stationary fronts. In summer at the high levels these processes were
accompanied by the Upper Tropospheric Cyclonic Vortex (UTCV) in the adjacent Atlantic
Ocean. The UTCV created the meridional currents from the Southern Hemisphere (SH) to
the Northern Hemisphere (NS). In winter the anticyclonic circulation was at high levels.
Synoptic scale systems in the BNE, coupling with the ITCZ, were of three types: 1)
anticyclonic vorticity at 1000 hPa and cyclonic at 200 hPa (UTCV), 2) cyclonic vorticity at
1000 hPa (Wave Disturbance in Trade Winds) and anticyclonic at 200 hPa (core of the
High) and 3) anticyclonic vorticity at both levels; ridge from South Atlantic subtropical
High at 1000 hPa and ridge from Bolivian High at 200 hPa (west of the UTCV). Intense
events were longer, and cloudiness covered the largest area. The number of wave cells
required for the SH undulation to become meridional and the frontal system to connect
with ITCZ was 4-5 nuclei. This number is less than in the NH, where this number was 6-7.

BANKING MEMBERS:
Externo(a) à Instituição - MANOEL ALONSO GAN - INPE
Presidente - 1099304 - NATALIA FEDOROVA
Interno(a) - 3430187 - ROSIBERTO SALUSTIANO DA SILVA JUNIOR
Interno(a) - 2227105 - VLADIMIR LEVIT