17 research outputs found

    Desenvolvimento de Metodologia para Validação e Análise de dados de dióxido de enxofre (so2) Atmosférico sobre o Continente Sul-Americano

    Get PDF
    This work describes the development of a methodology for validating the use of Brewer spectrophotometer for measuring the SO2 total columns, from adaptations in its original calculation algorithm. The results obtained show the possibility of using Brewer spectrophotometer to measure the total columns of sulfur dioxide, with a gain in data quality, of great help to understand the behavior of this gas in the atmosphere with observations that can be used for model validation and calibration of satellites.Este trabalho mostra o desenvolvimento de uma metodologia para validar o uso do espectrofotômetro Brewer na medição das colunas totais de SO2, a partir de adaptações em seu algoritmo original de cálculo. Os resultados obtidos revelam a possibilidade de uso do espectrofotômetro Brewer para medir as colunas totais de dióxido de enxofre, com ganho na qualidade dos dados, de grande auxílio para o conhecimento do comportamento deste gás na atmosfera, com observações que podem ser utilizadas para validação de modelos e calibração de satélites

    Systematic ozone and solar UV measurements in the Observatorio Atmosférico de la Patagonia Austral, Argentina

    Get PDF
    The depletion of the polar ozone layer is one of the strongest anthropogenic signals in the Earth system. Subpolar regions in the southern part of South America are affected by this phenomenon, covered sometimes by air masses with less ozone than normal with the corresponding UV enhancements at ground surface. Motivated by these atmospheric events, Argentina and Chile with the financial support of JICA has joined scientific efforts to develop UVO Patagonia project. The Observatorio Atmosférico de la Patagonia Austral is located in South Patagonia (51º 55?S, 69º 14'W), in the subpolar region and it is a convenient monitoring site of the atmosphere in the Southern Hemisphere. In this experimental site a differential absorption lidar instrument for the measurement of ozone vertical distribution is operative. The altitude range of the ozone measurement is 14-45 km, which provides the opportunity to monitor the turbulences due to the passage of stratospheric polar air over Río Gallegos. Systematic stratospheric ozone profile measurement has been carried on in this experimental site since 2005. We identified three major perturbations of the ozone hole over the stratospheric ozone profile in Río Gallegos. Approach of polar vortex during late winter, overpass of ozone hole in middle spring and dilution process during late spring change the shape and content of stratospheric ozone profile and as a consequence the solar UV. Solar surface irradiance and total ozone content were measured with a Brewer spectraphotometer and moderate narrow band radiometer GUV-541 deployed in the Río Gallegos experimental site.Fil: Wolfram, Elian Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Salvador, Jacobo Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Orte, Pablo Facundo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: D'elia, Raul Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Quel, Eduardo Jaime. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Casiccia, Claudio. Universidad de Magallanes; ChileFil: Zamorano, Felix. Universidad de Magallanes; ChileFil: Paes Leme, Neusa. Centro de Previsao de Tempo e Estudos Climáticos. Instituto Nacional de Pesquisas Espaciais; Brasi

    Análise Atmosférica dos Eventos de Efeito Secundário do Buraco de Ozônio Antártico Sobre o Sul do Brasil em 2012. Parte 1: Identificação dos Eventos e Análise da Dinâmica da Estratosfera

    Get PDF
    In this study were identified events of Influence of the Antarctic ozone hole over southern Brazil in the year 2012. For this, we analyzed the daily average data of total ozone column obtained through Brewer Spectrophotometer, installed in the southern Space Observatory-OESCRSINPE-MCTI (29.4° S; 53.8°; 488 m) and by satellite instruments Total Ozone Mapping Spectrometer (TOMS) and Ozone Monitoring Instrument (OMI), seeking days of falls in the ozone content. For these days, we analyzed potential vorticity maps made using Reanalysis data provided by NCEPNCAR and retroactive trajectories made through the Hysplit model of NOAA, in order to verify the origin of the polar air mass poor in ozone. In addition, it was also conducted a complementary analysis through the images of the ozone content of the OMI satellite, verifying the performance of the Antarctic Ozone Hole in polar regions and its connection with the Southern Brazil. The methodology used was shown to be effective in the identification of 2 events of side effect of the Antarctic ozone hole over the South of Brazil, which showed a fall of 12.1 ± 2.3 average in the ozone content.Na presente estudo foram identificados os eventos de Efeito Secundário do Buraco de Ozônio Antártico ocorridos sobre o Sul do Brasil no ano de 2012. Para isso, foram analisados os dados médios diários da coluna total de ozônio obtidos através de Espectrofotômetro Brewer, instalado no Observatório Espacial do Sul – OES/CRS/INPE – MCTI (29,4 °S; 53,8°O; 488,7m) e pelos instrumentos de satélite Total Ozone Mapping Spectrometer (TOMS) e Ozone Monitoring Instrument (OMI), buscando dias de quedas no conteúdo de ozônio. Para estes dias, foram analisados mapas de vorticidade potencial confeccionados utilizando dados de reanálise fornecidos pelo NCEP/NCAR e trajetórias retroativas confeccionadas através do modelo Hysplit da NOAA, a fim de verificar a origem polar da massa de ar pobre em ozônio. Além disso, foi também realizada uma análise complementar através das imagens do conteúdo de ozônio do satélite OMI, verificando-se a atuação do Buraco de Ozônio na região Antártica e sua conexão com o Sul do Brasil. A metodologia empregada mostrou-se eficaz na identificação de 2 eventos de Efeito Secundário do Buraco de Ozônio Antártico sobre o Sul do Brasil, os quais apresentaram uma queda média de 12,1 ± 2,3% no conteúdo de ozônio

    Survey of VLF-Omega transmissions received during summer in the Antarctic Peninsula

    Get PDF
    Preliminary results are presented for about one month of measurements of all existing VLF-Omega transmissions, performed by amplitude and phase tracking receivers controlled by atomic frequency standards operated at Brazilian Antarctic station Ferraz, in February 1984. For the purpose of comparison, simultaneous measurements were taken at Itapetinga Radio Observatory, near Sao Paulo by a single amplitude and phase tracking receiver. Basic propagation characteristics in phase variation, signal strength and nighttime modal interference were established for all transmissions, for at least three days each. A more detailed survey was performed on Omega-Argentina transmission, which was tracked for the whole period. These transmissions displayed systematic nighttime mode conversion effects, which are characteristic of the sudden phase delay peak at sunrise. The mean diurnal phase variation of Omega-Argentina transmissions, received at Ferraz, displayed diurnal phase variations much larger than expected at 13.6kHz, and much smaller at 10.2kHz. About 90 SID\u27s produced by solar flares were measured for various transmissions. They were analyzed comparatively on different transmission paths. Although there were flare-produced proton particles detected at satellite altitudes during the observing period, no substantial change in diurnal phase variation was detected on Omega-Argentina transmissions received at Ferraz

    ESTUDO DA VARIABILIDADE DA COLUNA DE ÁGUA PRECIPITÁVEL (PWC) NO SEMIÁRIDO BRASILEIRO PARA CALIBRAÇÃO DE FOTÔMETRO SOLAR

    No full text
    A água está presente na atmosfera na forma de vapor, indo desde o nível do solo até a estratosfera. Como principal componente do ciclo hidrológico, a variação em sua quantidade sobre uma região provoca alterações nas condições climáticas, afetando assim as condições de vida e econômicas da população local. O fotômetro solar permite monitorar a variação dessa coluna de vapor de água, ou coluna de água precipitável (PWC) utilizando a radiação solar na banda de 940 nm, que sofre uma forte absorção ao atravessar a atmosfera. Para a calibração do fotômetro solar desenvolvido nesse trabalho, foi investigado um sítio na região semiárida do estado do Rio Grande do Norte, próximo à cidade de Caicó. Foi aplicado o Método de Langley Modificado (MLM) que é uma variação do Método de Langley. Essa metodologia permite calibrar fotômetro solar em campo aberto, que sob a condição de estabilidade óptica da atmosfera, permite obter-se constantes de calibração com melhores índices de incerteza que em laboratório. Os resultados, durante o período estudado, mostraram que não ocorreu a esperada estabilidade óptica da atmosfera para permitir a calibração do equipamento

    New differential absorption lidar for stratospheric ozone monitoring in Patagonia, South Argentina

    No full text
    International audienceAs part of environmental studies concerned with measurements of the stratospheric ozone layer, CEILAP has developed a new differential absorption lidar (DIAL) instrument. Since the initial construction of the first DIAL instrument, the Lidar Division of CEILAP has made important financial and scientific investments to upgrade this initial prototype. The new version has a bigger reception system formed by four Newtonian telescopes, each of 50 cm diameter, and a larger number of detection channels: four different wavelengths are detected simultaneously and six digital channels record the Rayleigh and Raman backscattered photons emitted by a ClXe excimer laser at 308 nm and the third harmonic of a Nd–YAG laser at 355 nm. A number of different changes have been made to increase the dynamic range of this lidar: a mechanical chopper was installed together with a gated photomultiplier in the high-energy detection channels to avoid the detector being overloaded by strong signals from lower atmospheric layers. This new version was installed inside a shelter, giving the possibility to make field campaigns outside CEILAP laboratories, for example the SOLAR campaign made in the Argentine Patagonian region during 2005 and 2006 spring periods. In this paper a full description of the instrument update is given. Intercomparisons with the ozone sonde and satellite platform instrument are presented. The results show agreement better than 10% in 16–38 km altitude range when the same airmasses are sampled. The comparison with five quasi-coincident sondes launched in Punta Arenas during spring 2005 shows good agreement between both types of measurement, with relative differences inside 1σ deviation of the lidar measurement. The comparison of the integral of height integrated lidar profiles with total ozone column measured with a Brewer photometer shows good agreement, with relative differences less than 10%
    corecore