A permanent Raman lidar station in the Amazon: description, characterization, and first results

• Published in: Atmospheric Measurement Techniques
• Main Authors: Barbosa, Henrique de Melo Jorge, Barja, Boris, Pauliquevis, Theotonio UNIFESP, Gouveia, Diego Alves, Artaxo, aulo, Cirino, Glauber Guimarães, Santos, Rosa Maria Nascimento dos, Oliveira, Andre B.
• Other Authors: Universidade de São Paulo (USP), Inst Meteorol Cuba, Universidade Federal de São Paulo (UNIFESP), Inst Nacl de Pesquisas da Amazonia, Univ Estado Amazonas, Inst Fed Educ Ciencia & Tecnol São Paulo
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Gesellschaft Mbh 2014
• Subjects: Aerosol Robotic Network
• Online Access: http://repositorio.unifesp.br/handle/11600/37195; https://doi.org/10.5194/amt-7-1745-2014

A permanent UV Raman lidar station, designed to perform continuous measurements of aerosols and water vapor and aiming to study and monitor the atmosphere from weather to climatic time scales, became operational in the central Amazon in July 2011. the automated data acquisition and internet monitoring enabled extended hours of daily measurements when compared to a manually operated instrument. This paper gives a technical description of the system, presents its experimental characterization and the algorithms used for obtaining the aerosol optical properties and identifying the cloud layers. Data from one week of measurements during the dry season of 2011 were analyzed as a mean to assess the overall system capability and performance. Both Klett and Raman inversions were successfully applied. A comparison of the aerosol optical depth from the lidar and from a co-located Aerosol Robotic Network (AERONET) sun photometer showed a correlation coefficient of 0.86. By combining nighttime measurements of the aerosol lidar ratio (50-65 sr), back-trajectory calculations and fire spots observed from satellites, we showed that observed particles originated from biomass burning. Cirrus clouds were observed in 60% of our measurements. Most of the time they were distributed into three layers between 11.5 and 13.4 km a. g. l. the systematic and long-term measurements being made by this new scientific facility have the potential to significantly improve our understanding of the climatic implications of the anthropogenic changes in aerosol concentrations over the pristine Amazonia. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Instituto Nacional de Ciencia e Tecnologia (INCT) - Mudancas Climaticas Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Univ São Paulo, Inst Fis, BR-05508090 São Paulo, Brazil Inst Meteorol Cuba, Ctr Meteorol Camaguey, Matanzas, Cuba UNIFESP, Dept Ciencias Exatas & Terra, Diadema, SP, Brazil Inst Nacl de Pesquisas da Amazonia, Manaus, AM, Brazil Univ ...