Equatorial ozone characteristics as measured at Natal (5.9°S, 35.2°W)

Kirchhoff, V. W. J. H.; Hilsenrath, E.; Motta, A. G.; Sahai, Y.; Medrano-B., R. A.

doi:10.1029/jc088ic11p06812

Cited by 30 publications

(16 citation statements)

References 23 publications

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“…Deste modo o teor máximo de ozônio é observado na primavera, no verão diminui e novamente aumenta no outono [9,63,64]. Ressalta-se que a média anual de ozônio total de 265,4 UD obtida neste estudo está abaixo de pesquisas anteriores que indicaram uma média anual de 275 UD [64] e 268 UD [65].…”

Section: Figura 5 Boxplot Da Variabilidade Do: íNdice Uv (A); Ozôniounclassified

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Radiação Ultravioleta, Ozônio Total E Aerossóis Na Cidade De Natal-Rn

Lopo

Spyrides

Lúcio

et al. 2013

HOLOS

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RESUMOA cidade de Natal é denominada pelos seus habitantes de "Cidade do Sol" em razão de sua elevada luminosidade, contudo a capital do Rio Grande do Norte possui taxas de câncer de pele não melanoma acima da média das capitais do Nordeste do Brasil. Neste cenário, o presente artigo apresenta um estudo da radiação ultravioleta (UV) e índice UV em Natal e suas relações com variáveis relevantes como ozônio total, aerossóis, radiação solar global (RSG) e nebulosidade. A metodologia realizou um estudo descritivo e estatístico com aplicação da Análise de Componentes Principais (ACP) e Gráfico Biplot. Os dados foram obtidos no Instituto Nacional de Pesquisas Espaciais/Centro Regional do Nordeste (INPE/CRN), nos instrumentos TOMS-OMI/AURA e MODIS/TERRA e no Instituto Nacional de Meteorologia do Brasil. Os resultados indicaram que o índice UV apresenta média anual igual a 11, classificado como extremo pela Organização Mundial de Saúde e a intensidade da UVB e índice UV no primeiro semestre do ano são mais intensos que no segundo. A variabilidade anual da UV possui uma característica nos meses de setembro e outubro que consiste em uma estabilização/redução do índice UV numa fase de crescimento da RSG em razão da maior concentração anual de ozônio total, sendo que a maior quantidade de aerossóis contribui em menor escala para este evento. A ACP e gráfico Biplot contribuíram para identificar o evento, pois indicaram que o ozônio total e aerossóis possuem uma forte correlação negativa com o índice UV nos referidos meses. Os autores chamaram esta característica de Evento Anual de Primavera da UV (EAP-UV), uma vez que ocorre no início e durante esta estação.

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Section: Figura 5 Boxplot Da Variabilidade Do: íNdice Uv (A); Ozôniounclassified

“…Para dezembro, apesar da redução do ozônio total, acontece uma diminuição do índice UV em correspondência à queda da RSG (Tabela 3 e Figura 5), fato observado através de medições em outros locais no Hemisfério Sul [5,20,64].…”

Section: Figura 5 Boxplot Da Variabilidade Do: íNdice Uv (A); Ozôniounclassified

Radiação Ultravioleta, Ozônio Total E Aerossóis Na Cidade De Natal-Rn

Lopo

Spyrides

Lúcio

et al. 2013

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“…This is indicated in Figure 2, which shows an analysis of monthly mean ozonesonde data (which provide the vertical distribution of ozone in both the stratosphere and troposphere) from Natal, located on the east coast of Brazil. The top curve is taken from a climatology of total ozone measurements using ground-based Dobson instrumentation [Kirchhoff et al, 1983]. The other two curves are reproduced from ozonesonde data (V. W. J. H. Kirchhoff, unpublished data, 1985) and depict the relative seasonal variability of ozone observed in both the stratosphere and the troposphere.…”

Section: Paper Number 6d0466mentioning

confidence: 99%

Use of satellite data to study tropospheric ozone in the tropics

Fishman¹,

Minnis²,

Reichle³

1986

J. Geophys. Res.

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Three independent examples are discussed which suggest that photochemical ozone production in the troposphere can be observed in the tropics from an analysis of total ozone data. The first finding shows that the seasonal cycle of total columnar ozone is dominated by the seasonal cycle of tropospheric ozone, even though tropospheric ozone accounts for only 5–15% of the total ozone. Second, a case study is presented which shows that enhanced total ozone observed over the Amazon Basin can be associated with the presence of biomass burning. In situ measurements have confirmed that biomass burning does result in the production of photochemically generated ozone, analogous to the formation of “smog” near industrialized areas. Third, an analysis of the distribution of carbon monoxide obtained from a space shuttle platform is strongly correlated with the concurrent distribution of total ozone between 5°S and 10°N. Because all of the sources of carbon monoxide are located in the troposphere, this finding likewise suggests that the gradients of total ozone at low latitudes must also reflect processes occurring in the troposphere.

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“…For the digital sondes a vertical resolution of about 15 m can be achieved. The ECC launches of this data set use the same procedures as those used for the long-term observational program at Natal, Brazil, which has given excellent results [Kirchhoff et al, 1981;1983;1991]. The sampling pump efficiencies for the ECC sondes are individually calibrated before flight, following a procedure described by Torres and Bandy [1978]; the ozonesondes are also calibrated in the laboratory against UV ozone photometers, whose calibrations are traceable to the photometric ozone standards of the National Institute of Total column ozone and UVB radiation were measured by using an automated Brewer spectrophotometer [Brewer, 1973;Brewer and Kerr, 1973].…”

Section: Ozonesondesmentioning

confidence: 99%

Observations of the 1995 ozone hole over Punta Arenas, Chile

Kirchhoff¹,

Sahai²,

Casiccia³

et al. 1997

J. Geophys. Res.

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Abstract. We examine the appearance of the ozone hole over a populated area with more than 100,000 inhabitants. The largest population concentrations on the South American continent nearest the ozone hole region are Punta Arenas, Chile (53.0 ø S, 70.9 ø W) and Ushuaia, Argentina (54.5 ø S, 68.0 ø W), located close to the strait of Magallanes, opposite the Antarctic Peninsula. A special field mission was held in Punta Arenas, in September-October 1995 to investigate the vertical distribution of ozone during the appearance of the Antarctic ozone hole. Previous work has shown that the city of Punta Arenas is located at the edge of the hole area and is affected every year during a few days in the October period. The ozone trend near these locations is -0.5 % per year using the yearly averages and -1.2% per year using the October means. This trend is 2 to 5 times larger than the global average. Several ozonesondes of the electrochemical concentration cell type were launched from Punta Arenas to determine the vertical distribution of ozone during "normal" and "perturbed" conditions. The ozone hole passed over Punta Arenas on October 12, 13 and 14, 1995. In addition to the sondes, which were launched once a day, ozone column amounts and UVB radiation were measured with a ground-based ozone Brewer spectrophotometer. The strongest ozone depletion over Punta Arenas in 1995 occurred on October 13, when the ozone column decreased from a "normal" value of about 325 Dobson Units (DU) to 200 DU; the vertical distribution of ozone on October 13 compared with October 6 shows depleted ozone roughly 50% less during hole conditions in the stratosphere. The UVB intensities have increased accordingly. The spectral ratio for October 13 to October 4 is 13 times larger at 297 nm.

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Equatorial ozone characteristics as measured at Natal (5.9°S, 35.2°W)

Cited by 30 publications

References 23 publications

Radiação Ultravioleta, Ozônio Total E Aerossóis Na Cidade De Natal-Rn

Radiação Ultravioleta, Ozônio Total E Aerossóis Na Cidade De Natal-Rn

Use of satellite data to study tropospheric ozone in the tropics

Observations of the 1995 ozone hole over Punta Arenas, Chile

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