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Previous issue date: 2016-08-31 / O Rad?nio (Rn-222) ? um g?s nobre-radiativo, incolor, inodoro, ins?pido, denso (9,73 kg/m3) e altamente sol?vel na ?gua (solubilidade de 1,67x10-4 a 25?C e 1Atm) que, com exce??o do Di?xido de Carbono, ? o g?s com maior solubilidade na Atmosfera. Neste estudo foram analisadas a varia??o e correla??o das vari?veis meteorol?gicas com as emana??es de Rad?nio e ?ons atmosf?ricos em um ambiente de floresta equatorial e Caatinga do estado do Rio Grande do Norte, Brasil. Especificamente em biomas do Nordeste do Brasil (NEB) pouco se sabe sobre o comportamento Rn-222, no que diz respeito ? distribui??o nos diferentes n?veis da baixa troposfera, a exemplo da Mata Atl?ntica Dunar e Caatinga. Assim, o objetivo foi de investigar a rela??o entre vari?veis meteorol?gicas, as concentra??es atmosf?ricas de Rn-222 e ?ons atmosf?ricos para o per?odo caracterizado como seco e chuvoso, no munic?pio de Apod?-RN e Parnamirim-RN no per?odo seco, inseridos no bioma de Caatinga e Mata Atl?ntica Dunar Nordestina que abrange cerca de 800.000 Km2 e 19.427 km?, respectivamente. As medidas foram realizadas a 1,5 m do solo. Coletaram-se dados de temperatura do ar, umidade relativa, velocidade e dire??o do vento e press?o atmosf?rica bem como concentra??es de Rn-222 e de ?ons atmosf?ricos. Os resultados mostraram um padr?o bimodal no comportamento di?rio da concentra??o de Rn-222, nas primeiras horas da manh? observado em todos os dias. Comportamento semelhante foi observado para a concentra??o de ?ons entre 04:00 e 05:00 HL (Hor?rio Local) em Parnamirim. Em Apod?, o ciclo di?rio da concentra??o de Rn-222 mostrou um padr?o semelhante ao de Parnamirim, com um m?ximo principal de 29,38 Bq/m3 e 24,00 Bq/m3 durante a esta??o seca e chuvosa, respectivamente, em torno de 17:00 HL e um m?ximo secund?rio ?s 15:00 HL com 27,37 Bq/m3 (esta??o seca) e 19,00 Bq/m3 (esta??o chuvosa). Estes ciclos s?o consistentes com situa??es de uma atmosfera estaticamente neutra devido ? transi??o de per?odos de est?vel para regimes inst?veis (primeiro pico) e inst?veis para est?vel (segundo pico) de acordo com o n?mero de Richardson Bulk tamb?m observado neste estudo. Atrav?s do modelo de regress?o linear m?ltipla via an?lise de componentes principais as vari?veis meteorol?gicas que se mostraram mais correlacionadas com a concentra??o de Rn-222, com explica??o de 88% foram a umidade relativa, velocidade do vento e a radia??o solar global. / The Radon (Rn-222) is a radioactive noble-gas, colorless, odorless, tasteless, dense (9.73 kg / m3) and highly soluble in water (solubility 1,67x10-4 25 ? C and 1 atm) that, except for carbon dioxide is the gas with greater solubility in the atmosphere. This study analyzed the variation and correlation of meteorological variables with the emanations of Radon and atmospheric ions in a rainforest environment and Caatinga in the state of Rio Grande do Norte, Brazil. Specifically, in Northeast biomes of Brazil (NEB) little is known about the Rn-222 behavior in relation to the distribution in the different levels of the lower troposphere, such as the Atlantic Forest Dune and Caatinga. The objective was to investigate the relationship between meteorological variables, atmospheric concentrations of Rn-222 and atmospheric ions to the period characterized as dry and rainy in the municipality of Apodi-RN and Parnamirim-RN in the dry season, entered in the biome Caatinga and Northeast Atlantic Forest Dune which covers about 800,000 km2 and 19,427 square kilometers respectively. The measurements were taken at 1.5 m above the ground. Collected from the air temperature data, relative humidity, wind speed and direction, atmospheric pressure and Rn-222 and atmospheric ion concentrations. The results showed bimodal pattern in the daily behavior of the concentration of Rn-222, in the early morning hours observed in every day. 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 concentration of Rn-222 showed a pattern similar to Parnamirim, with a maximum principal of 29.38 Bq / m3 and 24.00 Bq / m3 during 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 conditions of a statically neutral atmosphere due to the periods of transition from stable to unstable regimes (first peak) and unstable stable (second peak) according to the Richardson number Bulk also observed in this study. Through multiple linear regression model via principal component analysis the meteorological variables that were more correlated with the concentration of Rn-222, with 88% explanation were the relative humidity, wind speed and solar radiation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22236 |
| Date | 31 August 2016 |
| Creators | Dantas, Vanessa de Almeida |
| Contributors | 36874620304, http://lattes.cnpq.br/1036476218421364, Bezerra, Bergson Guedes, 99210703472, http://lattes.cnpq.br/1901216516407999, Pereira, Enio Bueno, 53671082887, http://lattes.cnpq.br/0638551133292550, Fernandez, Jos? Henrique, 14260192892, http://lattes.cnpq.br/4207470264780724, Hoelzemann, Judith Johanna, 23182367803, http://lattes.cnpq.br/6590472437235971, Santos, Samira de Azevedo, 01349942480, http://lattes.cnpq.br/8334809149422137, Silva, Cl?udio Mois?s Santos e, Campos, Thomas Ferreira da Costa |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS CLIM?TICAS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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