FABIO JULIANO DA SILVA LOPES
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Artigo IPEN-doc 27704 Aerosol properties in the atmosphere of Natal/Brazil measured by an AERONET Sun-photometer2021 - OLIVEIRA, DANIEL C.F. dos S.; MONTILLA-ROSERO, ELENA; LOPES, FABIO J. da S.; MORAIS, FERNANDO G.; LANDULFO, EDUARDO; HOELZEMANN, JUDITH J.We analyzed data measured by a Sun-photometer of the RIMA-AERONET network with the purpose to characterize the aerosol properties in the atmosphere over Natal, state capital of Rio Grande do Norte, at the coast of Northeast Brazil. Aerosol Optical Depth, Ångström Exponent, Volume Size Distribution, Single Scattering Albedo, Complex Refractive Index, Asymmetry Factor, and Precipitable Water were analyzed from August 2017 to March 2018. In addition, MODIS and CALIOP observations, local Lidar measurements, and modeled backward trajectories were analyzed in a case study on February 9, 2018, that consistently confirmed the identification of a persistent aerosol layer below 4 km agl. Aerosols present in the atmosphere of Natal showed monthly mean Aerosol Optical Depth at 500 nm below 0.15 (~ 75%), monthly means of the Ångström Exponent at 440–670 nm between 0.30 and 0.70 (~ 69%), bimodal Volume Size Distribution is dominantly coarse mode, Single Scattering Albedo at 440 nm is 0.80, Refractive Index - Real Part around 1.50, Refractive Index - Imaginary Part ranging from 0.01 to 0.04, and the Asymmetry Factor ranged from 0.73 to 0.80. The aerosol typing during the measurement period showed that atmospheric aerosol over Natal is mostly composed of mixed aerosol (58.10%), marine aerosol (34.80%), mineral dust (6.30%), and biomass burning aerosols (0.80%). Backward trajectories identified that 51% of the analyzed air masses over Natal originated from the African continent.Artigo IPEN-doc 24738 Detection of saharan mineral dust aerosol transport over brazilian northeast through a depolarization lidar2018 - GUEDES, ANDERSON G.; LANDULFO, EDUARDO; MONTILLA-ROSERO, ELENA; LOPES, FABIO J.S.; HOELZEMANN, JUDITH J.; FERNANDEZ, JOSE H.; SILVA, MARCOS P.A.; SANTOS, RENATA S.S.; GUERRERO-RASCADO, JUAN L.; ALADOS-ARBOLEDAS, LUCASIn this study we present results of linear volume depolarization ratio profiles obtained by a depolarization lidar in operation in Natal, Brazil. The DUSTER system has 4 channels, namely: 1064, 532 s/p and 355 nm. This system is calibrated with a half-wave plate using the Δ90° methodology. The data obtained from this system is correlated with AERONET sunphotometer data, and, when available, CALIPSO satellite data. In addition a trajectory model (HYSPLIT) is used to calculate backward trajectories to assess the origin of the dust polluted air parcels. The objective is to create a transport database of Saharan dust.Artigo IPEN-doc 22796 DUSTER lidar: Transatlantic transport of aerosol particles from the Sahara and other sources: rst results from the recently installed lidar and sunphotometer in Natal/Brazil2016 - LANDULFO, EDUARDO; LOPES, FABIO J.S.; MONTILLA, ELENA; GUEDES, ANDERSON G.; HOELZEMANN, JUDITH J.; FERNANDEZ, JOSE H.; ALADOS-ARBOLEDAS, LUCAS; GUERRERO-RASCADO, JUAN L.The lidar confederative network for monitoring optical properties of aerosol on Latin America, LALINET, faces an important challenger to cover a large area of Latin America with so few lidar systems. Currently in Brazil there are only three operative lidar systems, two operating on Southeastern region and other on North region of Brazil. Taking into accounting the large dimension of Brazilian territory there is a lack of lidar system monitoring in several regions. In 2014 Laser Environmental Application Laboratory (LEAL) at Nuclear and Energy Research Institute (IPEN) together with Federal University of Rio Grande do Norte (UFRN), have started the rst e orts to install a depolarization lidar system at the city of Natal-RN (5o5002900 S ,35o1105700 W, 0 m asl), in the Northeast region of Brazil. This new lidar station intends to be in the future integrated to the LALINET network, and has as a rst aim to detect and to identify aerosol layers from Saharan dust and biomass burning type arriving from African continent. To examine these transports it is paramount to have a temporally and spatially well resolved observational platforms, which will be able to describe with accuracy the transport patterns followed by these aerosol layers over the Atlantic. To yield a good coverage based on the previously mentioned requirements satellite-based platforms are very well suited, but unless a geostationary system is provided a reasonable temporal representativeness may not be achieved. Our current study is devoted to the rst results aiming to detect and identify aerosol layers arriving over the Northeastern region of the South American continent, with a lidar and a sun-photometer recently installed in the city of Natal. Here we present the rst aerosol observation results with the lidar system and the sunphotometer carried out from January through May 2016 with the indication of potential dust and other-type aerosol layers through some backscatter pro les.Resumo IPEN-doc 19738 On the study of Saharan mineral dust over Latin America: the complexity of aerosol typing at São Paulo2013 - GUERRERO RASCADO, J.L.; LOPES, F.J.S.; LANDULFO, E.; ALADOS ARBOLEDAS, L.