Caracterização do transporte de aerossóis de poeira saariana sobre Natal-RN através da técnica de despolarização LIDAR
Saharan dust transport can reach distances of up to 5000 km and it is estimated that around 40 million tons of dust are transported annually from the Sahara to the Amazon basin, having important role as its main source of nutrients. In 2016, the first Brazilian LIDAR system with depolarization ch...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27386 |
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| Resumo: | Saharan dust transport can reach distances of up to 5000 km and it is estimated that around
40 million tons of dust are transported annually from the Sahara to the Amazon basin, having
important role as its main source of nutrients. In 2016, the first Brazilian LIDAR system with
depolarization channels, DUSTER, designed for atmospheric transport studies and characterization of aerosols on the South Atlantic was installed. The DUSTER system has 4 detection
channels, 1064 nm, 355 nm and depolarization channels 532 s nm and 532 p nm. The research
was conducted to calibrate the DUSTER system, applying the Δ90∘ method and characterize
the atmospheric aerosols that are being transported over the atmospheric Natal city region. The
data acquisition took place during the scientific campaigns that were designated MOLOTOV
ZERO (February / 2016 to July / 2016), MOLOTOV I (December / 2016 to February / 2017)
and MOLOTOV II (November / 2017 to February / 2018). The data obtained by the DUSTER
allowed to calculate the ratio of linear depolarization of particles (
), fundamental parameter in the characterization of atmospheric aerosols. The minimum and maximum values of
during the MOLOTOV ZERO, MOLOTOV I and MOLOTOV II campaigns were 0, 02±0, 003
and 0, 29±0, 023, 0, 02±0, 002 and 0, 28±0, 006, 0, 02±0, 001 and 0, 22±0, 001, respectively.
There were only 2 events detected compatible with Saharan dust aerosol. The classification of
the aerosol intrusions on the atmospheric region of Natal, indicated that they are constituted
predominantly by marine aerosols. In some episodes it was possible to detect mixtures of marine
aerosol + dust aerosol, however, mixtures between marine aerosol and biomass burning aerosol
were predominant. Data from the CIMEL photometer, installed next to DUSTER, corroborate the
analyzes and indicate that there is a higher concentration of marine aerosols and of Saharan dust
in two campaigns (MOLOTOV ZERO and MOLOTOV II). Analyzes of the HYSPLIT transport
model satisfactorily explain the presence of biomass-burning aerosols in the atmosphere locally
indicating that their origin is the west coast of the African continent in latitudes to the south,
whereas the transportation of Saharan dust aerosols are connected to the central African region.
The research data were also correlated with those of the CALIPSO satellite and CATS system
(coupled to the International Space Station), indicating the presence of compatible aresols, in
some cases, with those detected with DUSTER in soil. |
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