Surface ozone measurements at urban coastal site Chennai, in India

Pulikesi, M.; Baskaralingam, P.; Rayudu, V.N.; Elango, D.; Ramamurthi, V.; Sivanesan, S.

doi:10.1016/j.jhazmat.2006.04.040

Cited by 33 publications

(16 citation statements)

References 17 publications

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“…summer) (61.1 ppb), followed by winter (45.7 ppb), post-monsoon (35.6 ppb), and monsoon (27.1 ppb), respectively. This seasonal diurnal pattern is similar to that of other locations in India (Pulikesi et al 2006;Reddy et al 2010;Ahammed et al 2006;Beig et al 2007), but unlike to that of in Northern China (Meng et al 2009) where O 3 concentration were lowest in winter season. The larger variability in monthly averaged SO 2 ,NO x , and CO were noticed during the winter season, indicative of larger near-surface anthropogenic sources and boundary layer height evolution, whereas O 3 shows higher variability in the pre-monsoon season when the photochemistry is at its peak.…”

Section: Resultssupporting

confidence: 86%

Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India

et al. 2014

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In this study, we present long-term near-surface measurements of sulfur dioxide (SO 2 ), oxides of nitrogen (NO x ), carbon monoxide (CO), and ozone (O 3 ) carried out at an urban location, Kanpur (26.46°N, 80.33°E, 125 m amsl), in Northern India from June 2009 to May 2013. The mean concentrations of SO 2 , NO x , CO, and O 3 over the entire study period were 3.0, 5.7, 721, and 27.9 ppb, respectively. SO 2 , NO x and CO concentrations were highest during the winter season, whereas O 3 concentration peaked during summer. The former could be attributed mainly to the near-surface anthropogenic sources (e.g. automobiles, residential cooking, brick kilns, coal-burning power plants, agricultural land-clearing, and biomass burning) and low mixing height in winter, whereas the latter was clearly due to enhanced chemical production of O 3 during the pre-monsoon (i.e. summer) season. The lowest concentration of all trace gases were observed during the monsoon season, due to efficient wet scavenging by precipitation. The averaged diurnal patterns also showed similar seasonal variation. NO x and CO showed peaks during morning and evening traffic hours and a valley in the afternoon irrespective of the seasons, clearly linked to the boundary layer height evolution. Contrarily, O 3 depicted a reverse pattern with highest concentrations during afternoon hours and lowest in the morning hours. The mean rate of change of O 3 concentrations (dO 3 /dt) during the morning hours (08:00 to 11:00 h) and evening hours (17:00 to 19:00 h) at Kanpur were 3.3 ppb h −1 and −2.6 ppb h −1 , respectively. O 3 followed a positive linear relationship with temperature, except in post-monsoon season while the strong negative with the relative humidity in all seasons. The ventilation coefficient was found to be highest in the pre-monsoon season (15,622 m 2 s −1 ) and lowest during winter (2564 m 2 s −1 ), indicative of excellent pollution dispersion efficiency during the pre-monsoon season. However, the low ventilation coefficient during winter and post-monsoon seasons indicated that the highpollution potential occurs at this site.

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Section: Resultssupporting

confidence: 86%

Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India

et al. 2014

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“…The mixing ratio of O 3 near surface is always below 30 ppbv throughout the year. In a good agreement to this result, the mean surface O 3 mixing ratio of ∼10–25 ppbv was observed at an urban site of Chennai during year 2006 (Pulikesi et al , 2006). During the winter months, mixing ratio of O 3 varies from 40 to 50 ppbv without any significant vertical gradients in the free troposphere, between 1 and 8 km of altitudes.…”

Section: Seasonal Variations In O3 Over Chennai During 1996–1998supporting

confidence: 67%

“…Chennai is a metro city of India where anthropogenic emissions of precursors of O 3 are continuous throughout the year. As expected for a typical urban site, the diurnal variations of ozone at Chennai exhibit elevated mixing ratio during daytime with low values at night (Pulikesi et al , 2006). Therefore, O 3 mixing ratios near the surface were always low as the MOZAIC profile measurements were always taken during the night hours.…”

Section: Seasonal Variations In O3 Over Chennai During 1996–1998supporting

confidence: 62%

Climatology of tropospheric ozone and water vapour over Chennai: a study based on MOZAIC measurements over India

Sahu

Lal

Thouret

et al. 2011

Intl Journal of Climatology

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Climatology of tropospheric ozone (O 3 ) and water vapour (H 2 O) over a metro city of Chennai in southern India has been presented based on the Measurements of OZ one and water vapour by Airbus I n-service AirCraft (MOZAIC) data during 1996-2001. The seasonal trends in mixing ratio of O 3 are discussed in view of annual changes in the transport pattern, rainfall, and its relationship with ambient H 2 O. The vertical distributions of both O 3 and H 2 O show large seasonal variations. The observed high mixing ratios of O 3 in winter and spring months can be attributed to long-range transport of pollutants by the northwesterly winds associated with winter monsoon circulation. The lowest mixing ratio of 15 ppbv of O 3 from July to September coincides with the summer monsoon circulation over Indian subcontinent. The surface level mixing ratio of O 3 was observed to be below 30 ppbv throughout the year. On the other hand, monthly rainfall and vertical distributions of H 2 O show just opposite seasonal variations to that of O 3 mixing ratio. Chennai is a coastal city; therefore, the seasonal change in surface wind flow causes large variability in H 2 O concentrations of 6-30 g/kg in the lower troposphere. More or less similar annual patterns of mixing ratios of O 3 and H 2 O are repeated during different years of 1996-1998, except for some small-scale differences. High level of O 3 mixing ratio, particularly during the early winter months of year 1997, seems unusual as we do not see such trends for other year of measurements over Chennai. The case studies of profiles of O 3 , relative humidity (RH), and temperature in view of long-range transport over Chennai during the different seasons have been also discussed. Significant enhancements in tropospheric O 3 were observed over Chennai due to transport of air from forest fire regions of Indonesia during October 1997.

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“…Continuous observations and studies of surface O 3 in India began about 30 years ago and are currently underway in more than 20 various locations [14,24,60,62,76,[101][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116][117][118]. The diurnal and seasonal variation of surface O 3 over Kannur shows a classic profile of a rural area, which is strongly prejudiced by seasonal changes, similar to other places in India.…”

Section: Comparison Of O 3 With Other Observational Sitesmentioning

confidence: 99%

Long-Term Variations of Air Quality Influenced by Surface Ozone in a Coastal Site in India: Association with Synoptic Meteorological Conditions with Model Simulations

Resmi¹,

Nishanth

Kumar³

et al. 2020

Atmosphere

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Atmospheric ozone (O3) in the surface level plays a central role in determining air quality and atmospheric oxidizing capacity. In this paper, we review our comprehensive results of simultaneous measurements of surface ozone (O3) and its precursor gas (NOx) and weather parameters that were carried out continuously for a span of six years (January 2013–December 2018) at a typical rural coastal site, Kannur (11.9° N, 75.4° E) in South India. Surface O3 concentration reached its maximum during daytime hours and minimum during the night time. The influence of solar radiation and water content on variations of O3 are discussed. A Multi-Layer Perceptron (MLP) artificial neural network technique has been used to understand the effect of atmospheric temperature on the increase in O3 over the past six years. This has been found that temperature has been a major contributor to the increase in O3 levels over the years. The National Centre for Atmospheric Research- Master Mechanism (NCAR-MM) Photochemical box model study was conducted to validate the variations of O3 in different seasons and years, and the results were shown to be in good agreement with observed trends.

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Surface ozone measurements at urban coastal site Chennai, in India

Cited by 33 publications

References 17 publications

Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India

Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India

Climatology of tropospheric ozone and water vapour over Chennai: a study based on MOZAIC measurements over India

Long-Term Variations of Air Quality Influenced by Surface Ozone in a Coastal Site in India: Association with Synoptic Meteorological Conditions with Model Simulations

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