ANI SOBRAL TORRES
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Artigo IPEN-doc 12257 Air quality assessment using a multi-instrument approach and air quality indexing in an urban area2007 - LANDULFO, E.; MATOS, C.A.; TORRES, A.S.; SAWAMURA, P.; UEHARA, S.T.An air quality monitoring methodology is presented here employing an elastic backscattering Lidar, sunphotometer data, air quality indexing and meteorological data in the city of São Paulo (23°33′ S, 46°44′ W), Brazil, a typical Urban Area. This procedure was made aiming to gather information from different optical atmospheric techniques and add this information to the air quality data provided regularly by the environmental agencies in the city. The parameters obtained by the Lidar system, such as planetary boundary layer height, aerosol optical thickness and aerosol extinction and backscattering aerosol coefficients are correlated with air quality indexes/reports provided by state environmental control agencies in order to extend the database information concerning pollution assessment and abate policies.Artigo IPEN-doc 13749 A four-year lidar-sun photometer aerosol study at São Paulo, Brazil2008 - LANDULFO, EDUARDO; PAPAYANNIS, ALEXANDROS; TORRES, ANI S.; UEHARA, SANDRO T.; POZZETTI, LUCILA M.V.; MATOS, CAIO A. de; SAWAMURA, PATRICIA; NAKAEMA, WALTER M.; JESUS, WELLINGTON deA backscattering lidar system, the first of this kind in Brazil, has been used to provide the vertical profile of the aerosol backscatter coefficient at 532 nm up to an altitude of 4–6 km above sea level (ASL), in a suburban area in the city of São Paulo. The lidar system has been operational since September 2001. The lidar data products were obtained in a 4-yr period (2001–04) and concerned the aerosol optical thickness (AOT), the aerosol backscattering and extinction coefficients at 532 nm, cloud properties (cloud base, thickness), planetary boundary layer (PBL) heights, aerosol layering, and the structure and dynamics of the lower troposphere. The lidar data are presented and analyzed in synergy with AOT measurements obtained by a Cimel sun-tracking photometer in the visible spectral region, not only to validate the lidar data but also to provide an input value of the so-called extinction-to-backscatter ratio [lidar ratio (LR)]. A correlation between the lidar data and the data obtained by a Cimel sun-tracking photometer [belonging to the Aerosol Robotic Network (AERONET)] is being made to set a temporal database of those data that were collected concomitantly and to cross correlate the information gathered by each instrument. The sun photometer data are used to provide AOT values at selected wavelengths and thus to derive the Ångström exponent (AE) values, single scattering albedo (SSA) and phase function values, and LR values. The analysis of these data showed an important trend in the seasonal signature of the LR indicating a change of the predominant type of aerosol between the dry and wet seasons. Thus, during the wet season the LR lidar values are greater (50–60 sr), which indicates that larger absorption by the aerosols takes place during this period. The corresponding AE values range between 1.3 and 2 for both periods.Artigo IPEN-doc 16517 Study of the properties of aerosols and the air quality index using a backscatter lidar system and aeronet sunphotometer in the city of São Paulo, Brazil2010 - LANDULFO, EDUARDO; LOPES, FABIO J.S.; MARIANO, GLAUBER L.; TORRES, ANI S.; JESUS, WELLINGTON C. de; NAKAEMA, WALTER M.; JORGE, MARIA P.P.M.; MARIANI, RAUDA