Banca de DEFESA: JEAN SOUZA DOS REIS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JEAN SOUZA DOS REIS
DATA : 27/02/2018
HORA: 08:30
LOCAL: Sala de Reuniões do CCET
TÍTULO:

Dynamic and thermodinamic characteristics of Upper Air Cyclonic Vortices

PALAVRAS-CHAVES:

HLCV, tracking, termodynamic

PÁGINAS: 79
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
SUBÁREA: Meteorologia
ESPECIALIDADE: Meteorologia Sinótica
RESUMO:

This work is devoted to the study of dynamic and thermodynamic characteristics of the High Level Cyclonic Vortexes (HLCV) in the Northeast of Brazil (NEB), using an objective VCAN identification algorithm (OVIA) using ERA-Interim data from the reanalysis of the the European Center for Medium-Range Weather Forecasts (ECMWF) and the NCEP (National Centers for Environmental Prediction) Climate Prediction Center (CPC) set, both from 1980 to 2016. The OVIA showed more efficiency after two added improvements and could be redirected to other studies. The AIOV results were confirmed by the climatology, identifying 1493 VCAN, 51% occurring in the summer and 5% in the astral winter. In the analysis of the spatial climatology, the regions of greater occurrence of the HLCV on the continent are: The central region of Pernambuco; The coast in the border of Pernambuco and Paraíba; northern coast of Bahia; Central region of Bahia; South region of Bahia. It is observed that in the South Atlantic Ocean adjacent to the coast of NEB there is a great density of HLCV. In the summer, HLCV occur more frequently in the coastal and south-central regions of Bahia, central Pernambuco and the coast of the border of Pernambuco and Paraíba, while in autumn, the central and coastal region of Bahia are the most affected. Evidence that this system acts as an inhibitor of precipitation in NEB is shown when precipitation and preferential positioning of the HLCV is related. This result indicates that in addition to the systems that modify the dynamics of precipitation, the HLCV is responsible for the water deficit. The atmospheric profile of the divergence shows that there is a phase change in the mean atmosphere, the monthly analysis of vorticity and divergence show that March is the most intense HLCV. Two conceptual surveys are presented, they show that the lifted condensation level (LCL) at 860 hPa at the center of the HLCV and 940 hPa at the border. The profile on the border region was more unstable than the profile at the center of the HLCV. The behavior analyzed by the thermodynamic indices indicates that situations occur that even without favorable local thermodynamics, the atmosphere responds to a more intense dynamic system that forces conditions to favor convection.

MEMBROS DA BANCA:
Presidente - 1164414 - WEBER ANDRADE GONCALVES
Interno - 1752417 - CLAUDIO MOISES SANTOS E SILVA
Interno - 1858120 - DAVID MENDES
Interno - 1346630 - LARA DE MELO BARBOSA ANDRADE
Externo à Instituição - CLÊNIA RODRIGUES ALCÂNTARA - UFCG