Perfis verticais da densidade e da temperatura em uma atmosfera de Van der Waals na região metropolitana de Natal-RN, Brasil

• Autor(a) principal: Silva, Douglas do Nascimento
• Data de Publicação: 2019
• Outros Autores: Silva, Isamara de Mendonça, Medeiros, Deusdedit Monteiro
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/30978
• topic: Van der Waals; Atmosphere; Radiosonde; Vertical profile; Density

The constants a and b of the Van der Waals state equation for atmosphere are determined from the concentration, critical temperature and critical pressure of the air components, using the Kay mixing rule. The radiosonde measures atmospheric pressure p, temperature T and other meteorological variables at various altitude levels. Therefore, the density of the atmosphere can be calculated based on the parameters a, b, p and T. In this study, the diurnal and nocturnal vertical profiles of the monthly average density, in the atmosphere of metropolitan region of Natal-RN, Brazil, from 2010 to 2017, were constructed considering the atmospheric system as an ideal gas and as a Van der Waals gas. The vertical profiles of the mean density difference between these two approaches and the temperature were also shown. In both scenarios, the radiosonde data of the atmosphere of this region for the calculation of the density were used, with the altitude ranging from 50m to 10km, interpolated every 10m. It has verified that the density of the atmosphere as a Van der Waals gas presents values higher than the density of air as an ideal gas at low altitudes. In both cases, densities tend therefore to have the same values when altitude increases. It has also showed a strong dependence on density related to temperature, such that the densities presented higher values in the colder months