Propriedades ópticas de aerossóis na atmosfera de Natal/Brasil medidas por meio de um fotômetro solar da rede AERONET
The study of atmospheric aerosols contributes to the understanding of radiative forcing and global warming. In addition, aerosols may influence atmosphere chemistry, visibility, acid rain, human health and precipitation. Since 2016, Natal, capital of Rio Grande do Norte, Brazil, has a solar photo...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27474 |
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| Resumo: | The study of atmospheric aerosols contributes to the understanding of radiative
forcing and global warming. In addition, aerosols may influence atmosphere chemistry,
visibility, acid rain, human health and precipitation. Since 2016, Natal, capital of Rio Grande
do Norte, Brazil, has a solar photometer (CIMEL) of the RIMA-AERONET network that can
identify the presence of biomass burning aerosols and desert dust from Africa. For this
identification, it is aimed to characterize the optical properties of these aerosols present in the
atmosphere of Natal (RN). The data available by AERONET, at level 1.5, Version 3, provide
information on microphysical characteristics such as Optical Aerosol Depth (AOD),
Ångström Coefficient (α), Single Scattering Albedo (SSA), Asymmetry Factor (g), Complex
Refractive Index (N), Volume Size Distribution (VSD) and Precipitable Water. The data
collection period was from August 2017 to March 2018. Aerosols were classified based on
global climatologies and their optical properties were described. The observations of satellites
and the local LIDAR were verified in the course of a day for a case study. In addition,
backward trajectories were modeled with the HYSPLIT model to identify the predominant
origins of the air masses. Aerosols present in the atmospheric column of Natal showed
monthly means of AOD in the range of 0.10 to 0.15 with data representation of ~40%,
monthly means of α between 0.6 and 0.8 with representation above 30%, bimodal VSD with
dominant coarse mode, SSA about 0.80, real part around 1.500, imaginary part ranging from
0.0125 to 0.0437 and g above 0.74. The Precipitable Water accompanied the increase of AOD
with a weak correlation (R = 0,43). The classification showed mixed aerosols (60.40%),
marine aerosols (30.69%) and mineral dust (8.91%). The backward trajectories identified that
in about 51% of the cases the continental aerosols origined from the Africa. |
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