Banca de DEFESA: VANESSA DE ALMEIDA DANTAS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : VANESSA DE ALMEIDA DANTAS
DATA : 31/08/2016
HORA: 08:00
LOCAL: Auditório CCET
TÍTULO:

Influence of weather conditions in Radon concentration in Caatinga area an atlantic dune.

PALAVRAS-CHAVES:

Radon, atmospheric ions, Richardson Number.

PÁGINAS: 107
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

Radon (Rn-222) is a radiative noble-gas colorless, odorless, tasteless, dense (9,73
kg/m3) and highly soluble in water (solubility 1,67x10-4 at 25 °C and 1 atm), which, with the
exception of carbon dioxide, is the gas with greatest solubility in the atmosphere. This study
investigated the variation and correlation of meteorological variables with the emanations of
Radon and atmospheric ions in an equatorial forest and Caatinga environments of the state of
Rio Grande do Norte, Brasil. Specifically, little is known on Northeastern biomes of Brazil
(NEB) about the Rn-222 behavior in relation to the distribution within the different levels of
the lower troposphere, such as the Atlantic Forest Dune and Caatinga biomes. The objective
was to investigate the relationship between meteorological variables, atmospheric
concentrations of Rn-222 and atmospheric ions during the period characterized as dry and
rainy in the municipality of Apodi-RN and Parnamirim-RN, inserted in the Caatinga and
Atlantic Forest Dune biome in the northeast, which covers about 800,000 Km2 and 19,427
Km2 respectively. The measurements were taken at 1.5 m above the ground. Air temperature
data, relative humidity, wind speed and direction, atmospheric pressure, as well asRn-222 and
atmospheric ion concentrations were collected. The results showed a bimodal pattern in daily
behavior of Rn-222 concentration of observed every day, in the early morning hours. Similar
behavior was observed for the concentration of ions between 04:00 and 05:00 HL (Local
Time) in Parnamirim. In Apodi the daily cycle of the concentration of Rn-222 showed a
pattern similar to Parnamirim, with a main maximum of 29.38 Bq /m3 and 24.00 Bq / m3 in
the dry and rainy seasons, respectively, around 17:00 HL and a secondary maximum at 15:00
HL with 27.37 Bq / m3 (dry season) and 19.00 Bq / m3 (rainy season). These cycles are
consistent with situations of a statically neutral atmosphere due to the transition periods from
stable to unstable regimes (first peak) and unstable to stable (second peak) according to the
Bulk Richardson number also observed in this study.

MEMBROS DA BANCA:
Interno - 2086472 - BERGSON GUEDES BEZERRA
Interno - 1752417 - CLAUDIO MOISES SANTOS E SILVA
Externo à Instituição - ENIO BUENO PEREIRA - INPE
Interno - 1808127 - JOSE HENRIQUE FERNANDEZ
Interno - 1879213 - JUDITH JOHANNA HOELZEMANN
Externo à Instituição - SAMIRA DE AZEVEDO SANTOS - CTGás
Presidente - 350486 - THOMAS FERREIRA DA COSTA CAMPOS