Simultaneous measurements of ozone and its precursors on a diurnal scale at a semi urban site in India

Beig, G.; Gunthe, Sachin S.; Jadhav, D. B.

doi:10.1007/s10874-007-9068-8

Cited by 140 publications

(100 citation statements)

References 15 publications

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“…10c), the diurnal pattern of ozone showed a daytime high and a nighttime low similar to that observed over several urban and inland sites Nair et al, 2002;Jain et al, 2005;Beig et al, 2007). Increase in ozone was attributed to the photochemical reactions involving precursors, associated with the positive correlation with temperature and the precursor NO 2 (Fig.…”

Section: Daytime High and Nighttime Lowsupporting

confidence: 73%

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

2011

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Abstract. Measurements of ozone and NO 2 were carried out in the marine environment of the Bay of Bengal (BoB) during the winter months, December 2008-January 2009, as part of the second Integrated Campaign for Aerosols, gases and Radiation Budget conducted under the Geosphere Biosphere Programme of the Indian Space Research Organization. The ozone mixing ratio was found to be high in the head and the southeast BoB with a mean value of 61 ± 7 ppb and 53 ± 6 ppb, respectively. The mixing ratios of NO 2 and CO were also relatively high in these regions. The spatial patterns were examined in the light of airflow patterns, air mass back trajectories and other meteorological conditions and satellite retrieved maps of tropospheric ozone, NO 2 , CO, and fire count in and around the region. The distribution of these gases was strongly associated with the transport from the adjoining land mass. The anthropogenic activities and forest fires/biomass burning over the Indo Gangetic Plains and other East Asian regions contribute to ozone and its precursors over the BoB. Similarity in the spatial pattern suggests that their source regions could be more or less the same. Most of the diurnal patterns showed decrease of the ozone mixing ratio during noon/afternoon followed by a nighttime increase and a morning high. Over this oceanic region, photochemical production of ozone involving NO 2 was not very active. Water vapour played a major role in controlling the variation of ozone. An attempt is made to simulate ozone level over the north and south BoB using the photochemical box model (NCAR-MM). The present observed features were compared with those measured during the earlier cruises conducted in different seasons.

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Section: Daytime High and Nighttime Lowsupporting

confidence: 73%

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

2011

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“…On the other hand, during evening hours, pollutant emissions from vehicles get trapped in the descending boundary layer. Moreover the boundary layer remains low during winter season (Beig et al, 2007). The maximum rate of change of O 3 occurred in December, where observed NO x concentration was high and the minimum rate of change of O 3 was in July, during which NO x concentration was the lowest.…”

Section: Diurnal Variations Of Oxides Of Nitrogenmentioning

confidence: 93%

Observational Study of Surface O3, NOx, CH4 and Total NMHCs at Kannur, India

Nishanth

2014

Aerosol Air Qual. Res.

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This paper presents the results of measurements of the surface ozone (O 3 ), oxides of nitrogen (NO x ), methane (CH 4 ) and total non-methane hydrocarbons (TNMHCs) in a rural coastal location at Kannur (11.9°N, 75.4°E, 5 m asl), India from November 2009 to December 2011. The diurnal cycle for surface O 3 had a peak in the afternoon and declined during nighttime. The maximum and minimum mixing ratio of surface O 3 was observed in winter and monsoon seasons respectively. NO x concentration was high during mid-night to early morning and low during noontime. The diurnal variations of mixing ratios for NO x and O 3 were anti-correlated. Monthly average maximum (2.26 ± 0.44 ppmv) and minimum (0.43 ± 0.19 ppmv) CH 4 concentrations were observed in December and August respectively. The diurnal variations of CH 4 were similar to that of NO x . A CH 4 buildup was observed during early morning hours throughout the observational period. On an annual basis, the maximum, minimum and average total NMHCs were (25.45 ± 6.58 ppbv), (13.84 ± 4.31 ppbv), and (19.23 ± 5.56 ppbv) respectively at the observational site. Analysis of O 3 , NO, NO 2 , CH 4 and NMHC have been carried out and the correlation between O 3 and its precursors is discussed detailed. Further, the diurnal variation of O 3 over a free tropospheric region at Ooty, a hill station lying in the Western Ghats region of south India on clear sky days in February 2011 is also reported for a comparison.

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“…These concentrations are different as reported from other locations (eg., Beig et al, 2007;David and Nair, 2011;Singla et al, 2011) in India (Table 2). These variations are mainly due to the differences in the concentrations of precursor gases, chemical processes, anthropogenic activities prevailing in the concerned areas and meteorological parameters (Reddy et al, 2010).…”

Section: Diurnal and Seasonal Variations Of O 3 No No 2 And No Xmentioning

confidence: 98%

Analysis of Diurnal and Seasonal Behavior of Surface Ozone and Its Precursors (NOx) at a Semi-Arid Rural Site in Southern India

Reddy

Kumar

Balakrishnaiah

et al. 2012

Aerosol Air Qual. Res.

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Surface measurements of O 3 , NO, NO 2 and NO x have been made over a semi-arid rural site, Anantapur (14.62°N; 77.65°E; 331 m asl) in southern India, during January-December 2010. The highest monthly mean O 3 concentration was observed in April (56.1 ± 9.9 ppbv) and the lowest in August (28.5 ± 7.4), with an annual mean of 40.7 ± 8.7 ppbv for the observation period. Seasonal variations in O 3 concentrations were the highest during the summer (70.2 ± 6.9 ppbv), and lowest during the monsoon season (20.0 ± 4.7 ppbv), with an annual mean of 40.7 ± 8.7 ppbv. In contrast, higher NO x values appeared in the winter (12.8 ± 0.8 ppbv) followed by the summer season (10.9 ± 0.7 ppbv), while lower values appeared in the monsoon season (3.7 ± 0.5 ppbv). The results for O 3 , NO and NO 2 indicate that the level of oxidant concentration ([OX] = NO 2 + O 3 ) at a given location is the sum of NO x -independent "regional contribution" (background level of O 3 ) and linearly NO x -dependent "local contribution". The O 3 concentration shows a significant positive correlation with temperature, and a negative correlation with both wind speed and relative humidity. In contrast, NO x have a significant positive correlation with humidity and wind speed, and negative correlation with temperature. The slope between [BC] and [O 3 ] suggests that every 1 μg/m 3 increase in black carbon aerosol mass concentration causes a reduction of 4.7 μg/m 3 in the surface ozone concentration. A comparative study using satellite data shows that annual mean values of tropospheric ozone contributes 12% of total ozone, while near surface ozone contributes 82% of tropospheric ozone. The monthly mean variation of tropospheric ozone is similar to that tropospheric NO 2 , with a correlation coefficient of +0.80.

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Simultaneous measurements of ozone and its precursors on a diurnal scale at a semi urban site in India

Cited by 140 publications

References 15 publications

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

Observational Study of Surface O3, NOx, CH4 and Total NMHCs at Kannur, India

Analysis of Diurnal and Seasonal Behavior of Surface Ozone and Its Precursors (NOx) at a Semi-Arid Rural Site in Southern India

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