Variabilidade do conteúdo de ozônio da rede Shadoz em duas estações tropicais: Natal e Paramaribo
Ozone (O3) is a natural gas that filters the sun's ultraviolet radiation and thus reduces the harmful effects of type B ultraviolet radiation (UV-B) that reach the Earth, acts as a protective shield and therefore the importance of studying the stratospheric O3. The study aims to identify the...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/47608 |
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| Resumo: | Ozone (O3) is a natural gas that filters the sun's ultraviolet radiation and thus reduces the harmful
effects of type B ultraviolet radiation (UV-B) that reach the Earth, acts as a protective shield
and therefore the importance of studying the stratospheric O3. The study aims to identify the
modes of seasonal and interannual variability of O3 in Natal and Paramaribo, using O3 vertical
profile data due to mixing from the SHADOZ network station and observed data from ERA5
for 21 years of data (1998-2018). ) to the height of 29 km. With the equations of the time series,
mean and standard deviation, it was possible to calculate the monthly values and climatology
of the series studied. To compare the data series, the correlation and the MBE (Mean Bias
Error), MABE (Mean Absolute Bias Error) and RMSE (Root Mean Squared Error) indices were
used, which correspond to the average error between the data. The regression line was used to
show trends in the cities' O3 data and the Morlet wavelet transform was used to determine the
interannual variability modes of the ozone vertical profile. The highest values of O3 content are
in the range of 27 to 30 km and the climatologies for these same heights (0 to 30 km) show that
the highest values of O3 content occur in February and April and the lowest in May and June,
having a high standard deviation. The anomalies for the two regions showed an oscillation that
happens every two years that are influenced by the almost biennial oscillation. Several O3
maxima were found in the Hovmöller diagram for ERA 5 at 29 km, with highest peaks in 1995
and 2000, 2014/2015, with highest values of seasonal variability in August, September and
October. O3 trends were maintained in the series studied for ERA (1998-2018, 1979-2018) and
SHADOZ (1998-2018) and had low variability. For Natal, the relative differences showed that
SHADOZ in relation to ERA 5 had an approximate R2
of (0.80), with an RMSE of 6%,
underestimation of ERA 5 in relation to SHADOZ (1.69% ± 13, 7%) and MABE with values
of 7.42% ± 13.7%. Paramaribo, the relative differences showed that the data from SHADOZ in
relation to ERA an R2
of (0.90), with an RMSE of 8.4%, underestimation of ERA 5 in relation
to SHADOZ (1.05% ± 45.6 %) and MABE with values of 11.2% ± 45.6%. The climatology of
ERA (1998-2018, 1979-2018) and SHADOZ (1998-2018) showed that the series had their
maximum between February and March and September and October and the minimum between
May and July, with a defined semi-annual cycle. As a result of the wavelets and comparison of
the O3 anomalies with the climatic indices for SHADOZ and ERA 5 at 29km showed that QBO
has a greater influence on O3 in Natal, the other indices would need a larger series to see the influence. |
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