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Open AccessArticle

Analysis of Atmospheric Aerosol Optical Properties in the Northeast Brazilian Atmosphere with Remote Sensing Data from MODIS and CALIOP/CALIPSO Satellites, AERONET Photometers and a Ground-Based Lidar

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Graduate Program in Climate Sciences, Federal University of Rio Grande do Norte (PPGCC/CCET/UFRN), Natal - RN 59078-900, Brazil
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Department of Atmospheric and Climate Sciences, Federal University of Rio Grande do Norte (DCAC/CCET/UFRN), Natal - RN 59078-900, Brazil
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Environmental Science Department, Institute of Environmental, Chemical and Pharmaceutical Science, Federal University of São Paulo, Rua São Nicolau, 210, Centro, Diadema, São Paulo 09913-030, Brazil
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Center for Lasers and Applications, Nuclear and Energy Research Institute-IPEN, São Paulo 05508-000, Brazil
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Rhenish Institute for Environmental Research, University of Cologne (RIU), 50923 Köln, Germany
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Authors to whom correspondence should be addressed.
Atmosphere 2019, 10(10), 594; https://doi.org/10.3390/atmos10100594
Received: 6 August 2019 / Revised: 27 August 2019 / Accepted: 29 August 2019 / Published: 2 October 2019
(This article belongs to the Special Issue Remote Sensing of Aerosols)
A 12-year analysis, from 2005 to 2016, of atmospheric aerosol optical properties focusing for the first time on Northeast Brazil (NEB) was performed based on four different remote sensing datasets: the Moderate Resolution Imaging Spectroradiometer (MODIS), the Aerosol Robotic Network (AERONET), the Cloud-Aerosol LIDAR with Orthogonal Polarization (CALIOP) and a ground-based Lidar from Natal. We evaluated and identified distinct aerosol types, considering Aerosol Optical Depth (AOD) and Angström Exponent (AE). All analyses show that over the NEB, a low aerosol scenario prevails, while there are two distinct seasons of more elevated AOD that occur every year, from August to October and January to March. According to MODIS, AOD values ranges from 0.04 to 0.52 over the region with a mean of 0.20 and occasionally isolated outliers of up to 1.21. Aerosol types were identified as sea spray, biomass burning, and dust aerosols mostly transported from tropical Africa. Three case studies on days with elevated AOD were performed. All cases identified the same aerosol types and modeled HYSPLIT backward trajectories confirmed their source-dependent origins. This analysis is motivated by the implementation of an atmospheric chemistry model with an advanced data assimilation system that will use the observational database over NEB with the model to overcome high uncertainties in the model results induced by still unvalidated emission inventories. View Full-Text
Keywords: MODIS; CALIPSO; Lidar; aerosols; Dust; Northeast Brazil; trajectory model MODIS; CALIPSO; Lidar; aerosols; Dust; Northeast Brazil; trajectory model
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de Oliveira, A.M.; Souza, C.T.; Oliveira, N.P.M.; Melo, A.K.S.; Lopes, F.J.S.; Landulfo, E.; Elbern, H.; Hoelzemann, J.J. Analysis of Atmospheric Aerosol Optical Properties in the Northeast Brazilian Atmosphere with Remote Sensing Data from MODIS and CALIOP/CALIPSO Satellites, AERONET Photometers and a Ground-Based Lidar. Atmosphere 2019, 10, 594.

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