Ozone trends on equatorial and tropical regions of South America using Dobson spectrophotometer, TOMS and OMI satellites instruments

Sousa, Cristina Tobler de; Leme, Neusa Maria Paes; Martins, Minella Alves; Silva, F.R.; Penha, Tercio Luiz Bezerra; Rodrigues, N.L.; Silva, E.L.; Hoelzemann, Judith J.

doi:10.1016/j.jastp.2020.105272

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…At present, the vertical analysis of ozone is mainly conducted using satellites, unmanned aerial vehicles (UAVs), aircraft, meteorological towers, balloons, and differential absorption lidar (DIAL) (Chen et al., 2020; Greenberg et al., 2009; Klein et al., 2017; Leonard et al., 2017; Li et al., 2020; Pisano et al., 1997; Sousa et al., 2020). UAVs have the advantages of light weight, high flexibility, easy operation, and the ability to operate in environments with complex terrain, but their effective detection height is relatively low (Chen et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Source Apportionment of the Vertical Distribution of Ozone at a Site of the Pearl River Delta Region of China

Wang

Yan

Liu³

et al. 2021

Earth and Space Science

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Ozone pollution adversely affects human health. In recent years, ozone pollution has become an important research topic and a challenge. By combining differential absorption lidar (DIAL), meteorological gradient tower data, the Weather Research and Forecasting (WRF) model, and the backward trajectories model, changes in vertical ozone concentration, the influencing factors on ozone vertical distribution, and ozone sources were analyzed in Shenzhen from September 20 to 30, 2019.Results indicated that from September 25 to 30, there was obvious residual ozone and transport at night. The analysis of ozone concentration and meteorological factors shows that the temperatures of 291.3-301.8 K and the humidity of 19.4%-71.6% were conducive to ozone formation. As height increased from less than 0.1 km to 0.3 km, the average ozone concentration increased, and the average NO2 concentration decreased. The analysis of potential ozone sources showed that ozone was mainly transported from the northeast of China and that the highest concentration of ozone mainly comes from southeast of Jiangxi province in southeastern China.

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Section: Introductionmentioning

confidence: 99%

Characteristics and Source Apportionment of the Vertical Distribution of Ozone at a Site of the Pearl River Delta Region of China

Wang

Yan

Liu³

et al. 2021

Earth and Space Science

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Impacto do ENOS na Variabilidade da Coluna Total de Ozônio Sobre a Região Nordeste do Brasil - Parte 1: El Niño Canônico e Modoki

Lima

Nunes

Mariano

2020

Rev. bras. meteorol.

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Resumo O objetivo deste trabalho é analisar a variação anual e os efeitos do modo de variabilidade atmosférica El Niño (Canônico e Modoki) na Coluna Total de Ozônio (CTO) sobre o Nordeste Brasileiro (NEB) entre 1997 e 2018 utilizando dados dos sensores Total Ozone Mapping Spectrometer (TOMS) e Ozone Monitoring Instrument (OMI). Foi constatada uma variação mensal média em toda área estudada com comportamento típico de domínio do ciclo anual na variabilidade sazonal, apresenta valor mínimo no mês de maio e máximo em outubro. Observou-se uma tendência de decaimento na série dos valores médios durante o período analisado. Análises de agrupamento revelaram que diferentes regiões da NEB possuem comportamentos e valores médios de CTO diferenciados. Análise de ondeletas expôs ciclos de doze meses de duração atuando na CTO em toda área estudada, ciclos de seis meses, demonstrando que o ciclo semianual domina a variabilidade sazonal em menores latitudes, e ciclos de dois-três anos, representando a importante atuação da Oscilação Quase Bienal (OQB). As médias das anomalias mostram que eventos El Niño afetam a CTO causando, predominantemente, diminuição de seus valores. Esses eventos em modalidade Modoki tem maior potencial em afetar a CTO que os Canônicos com anomalias negativas de maior intensidade.

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Ozone Trend Analysis in Natal (5.4°S, 35.4°W, Brazil) Using Multi-Linear Regression and Empirical Decomposition Methods over 22 Years of Observations

Bencherif,

Pinheiro,

Delage

et al. 2024

Remote Sensing

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Ozone plays an important role in the Earth’s atmosphere. It is mainly formed in the tropical stratosphere and is transported by the Brewer–Dobson Circulation to higher latitudes. In the stratosphere, ozone can filter the incoming solar ultraviolet radiation, thus protecting life at the surface. Although tropospheric ozone accounts for only ~10%, it is a powerful GHG and pollutant, harmful to the health of the environment and living beings. Several studies have highlighted biomass burning as a major contributor to the tropospheric ozone budget. Our study focuses on the Natal site (5.40°S, 35.40°W, Brazil), one of the oldest ozone-observing stations in Brazil, which is expected to be influenced by fire plumes in Africa and Brazil. Many studies that examined ozone trends used the total atmospheric columns of ozone, but it is important to assess ozone separately in the troposphere and the stratosphere. In this study, we have used radiosonde ozone profiles and daily TCO measurements to evaluate the variability and changes of both tropospheric and stratospheric ozone separately. The dataset in this study comprises daily total columns of colocalized ozone and weekly ozone profiles collected between 1998 and 2019. The tropospheric columns were estimated by integrating ozone profiles measured by ozone sondes up to the tropopause height. The amount of ozone in the stratosphere was then deduced by subtracting the tropospheric ozone amount from the total amount of ozone measured by the Dobson spectrometer. It was assumed that the amount of ozone in the mesosphere is negligible. This produced three distinct time series of ozone: tropospheric and stratospheric columns as well as total columns. The present study aims to apply a new decomposition method named Empirical Adaptive Wavelet Decomposition (EAWD) that is used to identify the different modes of variability present in the analyzed signal. This is achieved by summing up the most significant Intrinsic Mode Functions (IMF). The Fourier spectrum of the original signal is broken down into spectral bands that frame each IMF obtained by the Empirical Modal Decomposition (EMD). Then, the Empirical Wavelet Transform (EWT) is applied to each interval. Unlike other methods like EMD and multi-linear regression (MLR), the EAWD technique has an advantage in providing better frequency resolution and thus overcoming the phenomenon of mode-mixing, as well as detecting possible breakpoints in the trend mode. The obtained ozone datasets were analyzed using three methods: MLR, EMD, and EAWD. The EAWD algorithm exhibited the advantage of retrieving ~90% to 95% of ozone variability and detecting possible breakpoints in its trend component. Overall, the MRL and EAWD methods showed almost similar trends, a decrease in the stratosphere ozone (−1.3 ± 0.8%) and an increase in the tropospheric ozone (+4.9 ± 1.3%). This study shows the relevance of combining data to separately analyze tropospheric and stratospheric ozone variability and trends. It highlights the advantage of the EAWD algorithm in detecting modes of variability in a geophysical signal without prior knowledge of the underlying forcings.

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Ozone trends on equatorial and tropical regions of South America using Dobson spectrophotometer, TOMS and OMI satellites instruments

Cited by 3 publications

References 26 publications

Characteristics and Source Apportionment of the Vertical Distribution of Ozone at a Site of the Pearl River Delta Region of China

Characteristics and Source Apportionment of the Vertical Distribution of Ozone at a Site of the Pearl River Delta Region of China

Impacto do ENOS na Variabilidade da Coluna Total de Ozônio Sobre a Região Nordeste do Brasil - Parte 1: El Niño Canônico e Modoki

Ozone Trend Analysis in Natal (5.4°S, 35.4°W, Brazil) Using Multi-Linear Regression and Empirical Decomposition Methods over 22 Years of Observations

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