Banca de QUALIFICAÇÃO: GABRIELA CACILDA GODINHO DOS REIS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : GABRIELA CACILDA GODINHO DOS REIS
DATE: 28/04/2023
TIME: 08:30
LOCAL: a cadastrar
TITLE:

Time Space Variability of Solar Ultraviolet Radiation Incident between the Amazon rainforest and Antarctica

KEY WORDS:

Solar ultraviolet radiation, time-space variability, environmental monitoring, Amazon, South America.

PAGES: 116
BIG AREA: Outra
AREA: Tecnologia e Inovação
SUMMARY:

The solar ultraviolet radiation - UV (280-400 nm) is a highly energetic component of the solar spectrum that needs to be monitored especially because of the effects on human health and on the ecosystems. The UV index (UVI) is a dimensionless indicator designed to report the intensity of UV incident on the Earth surface. It has five exposure categories, ranging from low to extreme, with recommended sun protections at each level. The higher the value, the greater the health risk.With only few stations reporting long-term ground-based UV measurements in several countries, which significantly restricts its extrapolations to all populated areas, a way for continuous monitoring UV on a global scale is through satellites. This study aims to characterize the time-space variability of UV at different time scales (daily, monthly, annual) in different locations, from the Amazon region to Antarctica, using satellite and ground-based data. This proposal is inserted in knowledge gaps about the temporal variability of surface UV in an Amazonian city (Santarém-PA), as well as covering cities in the northeast (Natal-RN), southeast (ItajubáMG), south of Brazil (Santa Maria-RS), Buenos Aires (Argentina) and Palmer Station in Antarctica. As partial results of this research, a first paper analyzing the temporal variability of surface UV incident in Santarém has been published, using a short-term time series of ground-based data. The results show that, there is a slight variation of UV intensity over the year. In all sky and clear sky conditions, the dry season had a higher average than the rainy season, despite a slight difference. Preliminary analyses of ground-based derived UV index for the cities of Natal, Itajubá, Santa Maria and Buenos Aires indicate that, considering the hours with extreme UV index levels, sun protection is needed in Natal starting from 9 am and from 10 am at Itajubá and Santa Maria. In Buenos Aires extreme levels start at 11 am. This research represents an important scientific contribution regarding UV patterns in different time scales from an Amazonian city, near to the equator, to Antarctica latitude. In addition, to serve as a basis for future research, for better understanding about UV variability and to be considered for the development of an excess UV exposure prevention strategy.

COMMITTEE MEMBERS:
Externa à Instituição - DAMARIS KIRSCH PINHEIRO - UFSM
Externo à Instituição - HASSAN BENCHERIF
Interno - 2034627 - JULIO TOTA DA SILVA
Presidente - 1549120 - RODRIGO DA SILVA