Aerosol optical properties in the atmosphere of Natal/Brazil measured a sun photometer of the AERONET
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2019
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SP SCHOOL OF ADVANCED SCIENCE ON ATMOSPHERIC AEROSOLS
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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 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 some microphysical characteristics such as Optical
Aerosol Depth (AOD), Ångström coefficient ( ), 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 August 2018. Aerosols were classified
based on global climatologies and their optical properties were described. Observations were
compared with daily measurements from satellites and the local LIDAR over the course of a day
for a case study. In addition, backward trajectories were modeled with the HYSPLIT model to
verify the predominant origin 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 peak of 40%, monthly
means of between 0.6 and 0.8 with peak above 30%, bimodal DTV with dominant coarse mode,
SSA about 0.8, real part around 1.5, imaginary part raging from 0.0125 to 0.0437 and g above
0.74. The Precipitable Water accompanied the increase of the precipitation for the months of
December, January, February and March. The classification identified mixed aerosols (60.40%),
marine aerosols (30.69%) and mineral dust (8.91%). The backward trajectories showed that in
51% of the cases the continental aerosols origined from the Africa.
Como referenciar
OLIVEIRA, D.C.; HOELZEMANN, J.J.; LANDULFO, E.; ARBOLEDAS, L.A. Aerosol optical properties in the atmosphere of Natal/Brazil measured a sun photometer of the AERONET. In: SP SCHOOL OF ADVANCED SCIENCE ON ATMOSPHERIC AEROSOLS, July 22 - August 2, 2019, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Física - USP, 2019. p. 95-95. Disponível em: http://repositorio.ipen.br/handle/123456789/32218. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.