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Barbosa H.M.J.,University of Sao Paulo | Lopes F.J.S.,University of Sao Paulo | Lopes F.J.S.,Brazilian Nuclear Energy Research Institute (IPEN) | Silva A.,University of Concepcion | And 10 more authors.
Optica Pura y Aplicada | Year: 2014

The first coordinated effort to perform simultaneous lidar measurements in Latin America was carried out as a pilot campaign between 10 and 14 September 2012. Four lidar stations contributed to the campaign measurements: Manaus, São Paulo, Concepción and Buenos Aires. Data from all four contributing stations were manually screened and a 1-h average cloud-free profile was selected from each one. These four elastic profiles were analyzed by four of the groups using their own elastic lidar algorithm. Here, the results for the particle backscatter coefficient are compared and discussed. We show that after five stages, the results have an agreement better than the typical uncertainty in the retrieval. Systematic errors found in different algorithms during the five stages of the exercise emphasize the need for analysis, measurements and data quality protocols. Difficulties involved in the coordination of the campaign and in the collaborative analysis are also highlighted.© Sociedad Española de Óptica. Source


Antuna J.C.,Grupo de Optica Atmosferica de Camaguey | Hernandez C.,Grupo de Optica Atmosferica de Camaguey | Estevan R.,Grupo de Optica Atmosferica de Camaguey | Barja B.,Grupo de Optica Atmosferica de Camaguey | And 2 more authors.
Optica Pura y Aplicada | Year: 2011

Applications of the Camagüey station solar radiation dataset are shown. The dataset has been rescued by the Grupo de Óptica Atmosférica de Camagüey team, consisting in hourly observations of direct, diffuse and global radiation belonging to the period 1981 to 2007. They have been reprocessed and quality controlled by properly designed computer software, generating a digital dataset in use for research and services. Applications in atmospheric research are described covering the calculation of the frequencies of hourly and monthly clear sky conditions, the evaluation of the tropospheric aerosols radiative effects and the evaluation of a radiative transfer model adjustment to the climatic conditions of Camagüey. Also, using clear sky observations and the Bouger-Lambert-Beer law, the broadband aerosol optical depth has been calculated. The solar radiation data rescue process, the applications and the results derived are completely new for Cuba and for the Caribbean. Service applications are provided at the web page "Diagnostic of the Solar Radiation in Camagüey". The site contains both hourly observations in real time and historical values of solar radiation variables for the period 1981 to 2007. Perspectives and future applications, already in progress or in design phase, are described. © Sociedad Española de Óptica. Source

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