Surface ozone variability over western Maharashtra, India

Debaje, S.B.; Kakade, Apurva

doi:10.1016/j.jhazmat.2008.04.010

Cited by 52 publications

(25 citation statements)

References 35 publications

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“…PAN and active hydrocarbons) also decreases and their atmospheric lifetime increases. O 3 concentrations were comparable to those reported at other urban locations in India (Chelani 2012;Debaje and Kakade 2009;Beig et al 2007;Sahu and Lal 2006;Satsangi et al 2004) as well as urban areas in China (Tu et al 2007;Tang et al 2009), but lower compared to rural and high altitude sites in India (24-36 %) Naja et al 2003;Reddy et al 2010) (Table 1). Figure 4 shows the seasonally averaged diurnal variation of trace gases at the Kanpur site.…”

Section: Resultssupporting

confidence: 73%

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: 73%

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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“…2 and 4). Debaje and Kakade (2009) reported the similar time lag from peak air temperature to peak O 3 concentration at continental rural site. Similarly, the maxima of O 3 concentration were always observed in the afternoon in all seasons similar to other coastal rural sites in southern India, a characteristic of rural site (Nair et al 2002;Debaje et al 2003;David and Nair 2011;Nishanth et al 2012).…”

Section: Methodsmentioning

confidence: 61%

Measurements of ozone and its precursor nitrogen dioxide and crop yield losses due to cumulative ozone exposures over 40 ppb (AOT40) in rural coastal southern India

Elampari

Debaje

Jeyakumar³

et al. 2013

J Atmos Chem

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“…Interestingly, Lal and Lawrence (2001) noted that the observations in major west coast Indian cities available up to that time showed much lower O 3 mixing ratios, typically about 10-35 nmol/mol on average, ranging up to ∼50 nmol/mol maximum daytime peak values (e.g., Varshney and Aggarwal, 1992;Lal et al, 2000). Several studies since then have also measured similar ozone levels in other Indian coastal cities (e.g., Nair et al, 2002;Debaje and Kakade, 2009). Lal and Lawrence (2001) suggested this would imply that strong photochemical production of ozone was occurring in the outflow, whereas ozone was being titrated by reaction with NO in the Indian cities, though it was unclear at first whether this would really be the case, since the NO emissions in Indian cities are considerably less than in many other parts of the world (see Tables 12 and 3).…”

Section: Gasesmentioning

confidence: 94%

Atmospheric pollutant outflow from southern Asia: a review

2010

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Abstract. Southern Asia, extending from Pakistan and Afghanistan to Indonesia and Papua New Guinea, is one of the most heavily populated regions of the world. Biofuel and biomass burning play a disproportionately large role in the emissions of most key pollutant gases and aerosols there, in contrast to much of the rest of the Northern Hemisphere, where fossil fuel burning and industrial processes tend to dominate. This results in polluted air masses which are enriched in carbon-containing aerosols, carbon monoxide, and hydrocarbons. The outflow and long-distance transport of these polluted air masses is characterized by three distinct seasonal circulation patterns: the winter monsoon, the summer monsoon, and the monsoon transition periods. During winter, the near-surface flow is mostly northeasterly, and the regional pollution forms a thick haze layer in the lower troposphere which spreads out over millions of square km between southern Asia and the Intertropical Convergence Zone (ITCZ), located several degrees south of the equator over the Indian Ocean during this period. During summer, the heavy monsoon rains effectively remove soluble gases and aerosols. Less soluble species, on the other hand, are lifted to the upper troposphere in deep convective clouds, and are then transported away from the region by strong upper tropospheric winds, particularly towards northern Africa and the Mediterranean in the tropical easterly jet. Part of the pollution can reach the tropical tropopause layer, the gateway to the stratosphere. During the monsoon transition periods, the flow across the Indian Ocean is primarily zonal, and strong pollution plumes originating from both southeastern Asia and from Africa spread across the central Indian Ocean. This paper provides a review of the current state of knowledge based on the many observational and modeling studies over the last decades that have examined the southern AsianCorrespondence to: M. G. Lawrence (mark.lawrence@mpic.de) atmospheric pollutant outflow and its large scale effects. An outlook is provided as a guideline for future research, pointing out particularly critical issues such as: resolving discrepancies between top down and bottom up emissions estimates; assessing the processing and aging of the pollutant outflow; developing a better understanding of the observed elevated pollutant layers and their relationship to local sea breeze and large scale monsoon circulations; and determining the impacts of the pollutant outflow on the Asian monsoon meteorology and the regional hydrological cycle, in particular the mountain cryospheric reservoirs and the fresh water supply, which in turn directly impact the lives of over a billion inhabitants of southern Asia.

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Surface ozone variability over western Maharashtra, India

Cited by 52 publications

References 35 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

Measurements of ozone and its precursor nitrogen dioxide and crop yield losses due to cumulative ozone exposures over 40 ppb (AOT40) in rural coastal southern India

Atmospheric pollutant outflow from southern Asia: a review

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