Observations of trace gases, photolysis rate coefficients and model simulations over semi-arid region, India

Lingaswamy, A.P.; Arafath, S.Md.; Balakrishnaiah, G.; Gopal, K. Rama; Reddy, Narendra; Reddy, K. Suresh Kumar; Reddy, R.R.; Kotalo, Rama Gopal

doi:10.1016/j.atmosenv.2017.03.048

Cited by 11 publications

(8 citation statements)

References 70 publications

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“…The possible aerosol sources are present at this site during the summer (March-May) including agriculturar burning activites, fossil fuel burning activities, and transported/windblown dust from north-western winds, (Kalluri et al, 2017;Gopal et al, 2014;. Domestic burning is the main aerosol source in winter (December-February) (Gopal et al, 2017;Lingaswamy et al, 2017;Kalluri et al, 2016).…”

Section: Accepted Manuscriptmentioning

confidence: 98%

The Impact of Lockdown on eBC Mass Concentration over a Semi-arid Region in Southern India: Ground Observation and Model Simulations

Palle

Kalluri

Gugamsetty

et al. 2021

Aerosol Air Qual. Res.

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In the present study, we focused on the impact of lockdown on black carbon (eBC) mass concentrations and their associated radiative implications from 01 st March to 30 th June 2020, over a semi-arid station, i.e., in the district of Anantapur in Southern India. The mean eBC mass concentration was observed before lockdown (01 st -24 th March 2020) and during the lockdown (25 th March to 30 th June 2020) period and was about 1.74±0.36 and 1.11±0.14 µg m -3 , respectively. The sharp decrease (~35%) of eBC mass concentration observed during the lockdown (LD) period as compared with before lockdown (BLD) period, was mainly due to the reduction of anthropogenic activities and meteorology. Furthermore, during the entire LD period, the net composite forcing at the top of the atmosphere (TOA) and at the surface (SUR) varied from -4.52 to -6.19 Wm -2 and -22.91 to -29.35 Wm -2 , respectively, whereas the net forcing in the atmosphere (ATM) varied from 17.27 to 23.16 Wm -2 . Interestingly, the amount of energy trapped in the atmosphere due to eBC is 11.19 Wm -2 before LD and 8.56 Wm -2 during LD. It is concluded that eBC contributes almost 43 -50% to the composite forcing. As a result, the eBC atmospheric heating rate decreased significantly (25%) when compared to before lockdown days to lockdown days.

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Section: Accepted Manuscriptmentioning

confidence: 98%

The Impact of Lockdown on eBC Mass Concentration over a Semi-arid Region in Southern India: Ground Observation and Model Simulations

Palle

Kalluri

Gugamsetty

et al. 2021

Aerosol Air Qual. Res.

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“…Actinic flux and solar zenith angle have a significant effect on the photolysis rates, both can dramatically modify net ozone output rates and regulate different tropospheric reactions. Ambient aerosol concentrations in the morning and afternoon hours of the study region will also impact on NO 2 photolysis (1,30,31).…”

Section: Diurnal Variation In J No2mentioning

confidence: 99%

Analysis of Ozone Photochemistry over Southern Tropical Megacity, Bengaluru, India

Dhanya¹,

Pranesha²,

Chate

et al. 2022

Photochem & Photobiology

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Rapid infrastructure development, increased population, shift in land use practices and higher vehicular emissions have all influenced Ozone (O3) production through its precursor gases in southern megacity, Bengaluru, India. We have investigated the photochemistry using hourly measurements of O3 and associated precursor gases conducted in Bengaluru during January to December 2019. The rate of formation of O3 is analyzed for Bengaluru for the first time using a photochemical model involving NOx cycle. On the diurnal scale, O3 showed a midday peak (1200–1500 IST), while its precursors showed a bimodal trend with peaks at 0900 IST and 2100 IST. The photolytic rate constants for jNO2 and jnormalO3 were derived from the tropospheric ultraviolet and visible (TUV) radiation model. Using the photolytic rate constants for jNO2 and jnormalO3 under the triad NO‐NO2‐O3, photostationary state (PSS), Leighton ratio (Ф) and its deviations from unity were estimated over Bengaluru. Positive anomalies (Φ > 1) were obtained, and the computed Φ was utilized to determine the total mixing ratios of the peroxy radical (PO2). The seasonal variation in jO3 revealed that in the presence of intense solar radiation and NOx, VOCs, CO and NMVOCs in the mixing layer, O3 forms photochemically over the surface.

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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%

“…Photochemical models are essential for assessing and studying the dynamics of an atmospheric trace gases and dust particles at a particular location [56][57][58]. Many groups [59][60][61][62][63][64] have used the NCAR-MM model to study in detail the photochemical reaction of trace gas in the terrestrial atmosphere for better understanding, and the model simulations were consistent with their observations.…”

Section: Introductionmentioning

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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Observations of trace gases, photolysis rate coefficients and model simulations over semi-arid region, India

Cited by 11 publications

References 70 publications

The Impact of Lockdown on eBC Mass Concentration over a Semi-arid Region in Southern India: Ground Observation and Model Simulations

The Impact of Lockdown on eBC Mass Concentration over a Semi-arid Region in Southern India: Ground Observation and Model Simulations

Analysis of Ozone Photochemistry over Southern Tropical Megacity, Bengaluru, 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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