Banca de DEFESA: DANIEL MILANO COSTA DE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIEL MILANO COSTA DE LIMA
DATE: 04/03/2022
TIME: 08:30
LOCAL: Videoconferência
TITLE:

EVALUATION OF THE IMPACT OF THE SOUTHERN NIÑO-OSCILATION AND SOUTHERN ANNULAR MODE VARIABILITY MODES ON OZONE CONCETRATIONS OVER THE SOUTHERN HEMISPHERE

KEY WORDS:

ENSO, SAM, TOC

PAGES: 139
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Meteorologia
SUMMARY:

Ozone is a gas present in the Earth's atmosphere in small amounts that contributes significantly to the energy balance of the atmosphere. Several factors can affect its concentration and distribution, such as the El Niño - Southern Oscillation (ENSO) and Southern Annular Mode (SAM) variability modes. In this study, climatological analyzes and analyzes for periods with ENSO and SAM action were performed using a robust series of Total Ozone Column (TOC) data from the Multi-sensor reanalysis (MSR) product, made available by the European Center for Medium-Range Weather Forecasts (ECMWF), for the area of the southern hemisphere, spanning a period of 41 years (1980-2020). TOC’s means, anomalies when under the action of variability modes and statistical analysis of the dominant variability patterns were obtained. The TOC's climatological quarterly behavior agrees with the results of previous studies. When there is El Niño action, the accentuated transport of Brewer-Dobson Circulation (BDC) causes positive anomalies at higher latitudes and negative anomalies at low latitudes. During La Niña the inverse is observed. In the study for the action of the positive phase of the SAM, in agreement with previous studies and with the theoretical behavior of the SAM, a predominance of negative anomalies in high and medium latitudes is observed. In the action of the positive phase of the SAM, a predominance of negative anomalies in high and medium latitudes and positive anomalies in low latitudes is observed. The inverse is observed for the negative phase. Statistical analyzes show that the patterns of greatest influence on TOC in DJF, MAM and JJA are SAM and BDC ozone transport. The polar vortex and the ozone “croissant” are the dominant patterns in SON. Trends of increase in the frequency of SAM positive phase and the increase in the average concentration of the TOC within the polar vortex in the spring months are observed, which may be linked to the climatic changes that occurred within the study period.

BANKING MEMBERS:
Presidente - 1846078 - GLAUBER LOPES MARIANO
Interno - 1537309 - FABRICIO DANIEL DOS SANTOS SILVA
Externa ao Programa - 3379896 - ERICKA VOSS CHAGAS
Externo à Instituição - LUCAS VAZ PERES - UFPA