Role of lightning phenomenon over surface O3 and NOx at a semi-arid tropical site Hyderabad, India: inter-comparison with satellite retrievals

Venkanna, R.; Nikhil, G.N.; Sinha, P. R.; Rao, T. Siva; Swamy, Y.V.

doi:10.1007/s00704-015-1538-3

Cited by 4 publications

(4 citation statements)

References 53 publications

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“…After the peaks, ozone production decreases since there may be a decrease in the NO 2 (Figure 3B) concentration. Similar to our results, the peaks in the morning and late evening hours were also reported in other urban regions in India, e.g., Hyderabad (Yerramsetti et al, 2012;Venkanna et al, 2015), Chennai (Mohan and Saranya, 2019), and Mumbai (Raparthi et al, 2022), due to vehicular traffic and other anthropogenic activities. Another potential explanation is that throughout the night, NO combines with O 3 to generate NO 2 , which leaves a large amount of NO 2 for photolysis in the morning (Zavala et al, 2020).…”

Section: Net Production Of Ozonesupporting

confidence: 91%

Chemical kinetics of near-surface ozone at a suburban location in India

Sagar,

Kanchana,

Nayak

et al. 2023

Front. Environ. Sci.

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The spatial gradient in near-surface ozone (O3) is controlled by its production, sink, and net transport (advection/convection and diffusive) in the atmosphere. In this work, we used continuous long-term measurements of O3, oxides of nitrogen (NOx = NO + NO2), and meteorological data in the suburban location of Shadnagar, India. Data analyses were performed to investigate the governing processes that control O3 variability on diurnal and seasonal time scales. The role of chemistry in O3 variability, including both formation and destruction processes, was investigated using known chemical kinetics and a radiative transfer model. The residual between observations and chemical estimation was further analyzed to examine the role of transport and unresolved processes/uncertainty in the dataset. The O3 residual was duly validated using model reanalysis data of O3 and meteorological parameters to further estimate the O3 transport. Our analyses show that the average net production and net transport of near-surface O3 are 3.18 and 0.87 ppbv/h, respectively, while horizontal advection is 0.01 ppbv/h in the daytime. The production of ozone was found to be dominant, indicating the influx of ozone at the site. Overall, our results highlight that spatio-temporal variability in near-surface ozone is strongly controlled by net production in Shadnagar and may be applicable in similar environments globally.

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Section: Net Production Of Ozonesupporting

confidence: 91%

Chemical kinetics of near-surface ozone at a suburban location in India

Sagar,

Kanchana,

Nayak

et al. 2023

Front. Environ. Sci.

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“…Surface NO x associated with thunderstorms has also been observed to titrate ozone at nighttime, such as a 41 ppbv increase in NO x associated with a 26 ppbv decrease in ozone during the evening of Aug 8, 2012 over Hyderabad, India [16,165]. Marginally increasing the fraction of lightning NO x released directly into the boundary layer in a regional air quality model of the contiguous USA led to increased NO x titration of surface ozone.…”

Section: Local Impactsmentioning

confidence: 91%

“…Reported surface-NO x enhancements associated with thunderstorms are scare. Those that exist report peak values of about 40 ppbv over India, 25 ppbv over Taiwan, and 30 ppbv (mostly as NO 2 ) over northern Alabama, and persist from minutes during the day to a few hours at night [16,64,96,114,115,165]. However, reported surface concentrations never exceed current health guidelines for short-term NO 2 exposure (1-h mean 100 ppbv [174]).…”

Section: Nitrogen Dioxidementioning

confidence: 93%

Lightning NO x and Impacts on Air Quality

2016

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Lightning generates relatively large but uncertain quantities of nitrogen oxides (NO x ), critical precursors for ozone and hydroxyl radical (OH), the primary tropospheric oxidants. Lightning NO x strongly influences background ozone and OH due to high ozone production efficiencies in the free troposphere, effecting small but non-negligible contributions to surface pollutant concentrations. Lightning globally contributes 3-4 ppbv of simulated annual-mean policy-relevant background (PRB) surface ozone, comprised of local, regional, and hemispheric components, and up to 18 ppbv during individual events. Feedbacks via methane may counter some of these effects on decadal time scales. Lightning contributes ∼1 % to annual-mean surface particulate matter, as a direct precursor and by promoting faster oxidation of other precursors. Lightning also ignites wildfires and contributes to nitrogen deposition. Urban pollution influences lightning itself, with implications for regional lightning-NO x production and feedbacks on downwind surface pollution. How lightning emissions will change in a warming world remains uncertain.

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“…Over the Asian region, lightning contributes *40% to NO x and 20% to ozone production in the middle and upper troposphere during the monsoon season (Fadnavis et al 2014a). Previous studies (Bharali et al 2015) have reported an increase in the O 3 mixing ratio *18 ppbv during pre-monsoon and *12 ppbv during summer associated with the lightning activity over Dibrugarh (27.4°N, 94.9°E) in northern India and over Hyderabad (17.44°N, 78.30°E) (a station in southern peninsular India) (Venkanna et al 2016). Kavitha et al (2018) reported an enhancement in NO x (5.2-8.7 ppbv) and an associated reduction in surface O 3 mixing ratio (9.9-18.8 ppbv) during pre-monsoon and monsoon seasons due to lightning activity.…”

Section: Variations In Ozone and No X Due To Lightningmentioning

confidence: 93%