Study of atmospheric air pollutants during the partial solar eclipse on 15 January 2010 over Udaipur: A semi-arid location in Western India

Vyas, B. M.; Saxena, Abhishek; Panwar, Chhagan

doi:10.1016/j.asr.2012.07.021

Cited by 3 publications

(4 citation statements)

References 27 publications

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“…Using observations and simulations at Kannur in the southern region of India, Nishanth et al (2011) found a reduction of 57.5% in O 3 induced by the eclipse on 15 January 2010 and suggested that the decrease of 59% in O 3 was associated with nitrogen dioxide (NO 2 ) photolysis rate drop. For the same eclipse event, Vyas et al (2012) reported the same values and a slight depletion in a small range from −9 to −2 ppb on O 3 at Udaipur, India on the eclipse day. Overall, the previous studies proposed that the O 3 changes were related to photochemical processes with its precursor gases.…”

Section: Introductionmentioning

confidence: 55%

“…Sharma et al (2010) observed NO 2 decreases from 2.52 to 0.78 ppb during a solar eclipse. However, Vyas et al (2012) found that the differences in NO 2 increased slightly from −1.8 to 0.9 ppb during the maximum obscuration of the solar eclipse. After the maximum obscuration, there was a certain fluctuation in the range of 0.9-1.6 ppb.…”

Section: Discussionmentioning

confidence: 90%

“…As precursor gases, NO 2 and CO were important to the production of O 3 (e.g., Nishanth et al, 2011;Vyas et al, 2012). Figure 5 and Figure 6 give the variation percentage of NO 2 and CO in Yunnan, respectively.…”

Section: Surface No 2 and Carbonic Oxide (Co) Variationsmentioning

confidence: 99%

“…CO changes were minor due to the non-reaction of CO compared to NO 2 . However, for Kunming, CO increases were associated with the chemical reaction of altering CO, etc., like CO + 2O 2 + h] → CO 2 + O 3 (Sharma et al, 2010;Vyas et al, 2012). The reaction weakened and CO increased as solar radiation reduced.…”

Section: Figurementioning

confidence: 99%

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Effects of the annular eclipse on the surface O3 in yunnan province, China

Tian

Yang

et al. 2022

Front. Environ. Sci.

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The impact of the annual solar eclipse, starting on 21st June 2020, attributable to surface ozone concentration (O3) has been investigated in this study. To estimate the influence of the solar eclipse on O3 better, the variations of one reaction precursor of ozone production [nitrogen dioxide (NO2)], coupled with the meteorological factors (including Total Solar Irradiance (TSI), Temperature (T), and Relative Humidity (RH)), were analyzed in Yunnan Province, China. The results show observed O3 decreases from the beginning of the eclipse, reaching its minimum value when the eclipse left Yunnan province. During the period of the solar eclipse, the O3 decrease lasted for 20 h with a reduction of more than 40%. The reduction of TSI lasted for 5 h with a maximum at -90%. Simultaneously, the temperature decreased but the relative humidity increased during the reduction in solar radiation. O3 exhibits a significantly positive correlation with temperature and a negative correlation with relative humidity. However, NO2 did not show a clear response with changes lasting for 4 h. O3 and NO2 show a negative correlation. The influence of CO on O3 is minor except for Kunming. Thus, O3 in seriously polluted cities is more sensitive to NO2 and CO during the eclipse, such as in Kunming.

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Section: Introductionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 90%

Section: Surface No 2 and Carbonic Oxide (Co) Variationsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Effects of the annular eclipse on the surface O3 in yunnan province, China

Tian

Yang

et al. 2022

Front. Environ. Sci.

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Impact of the Eclipsed Sun on Terrestrial Atmospheric Parameters in Desert Locations: A Comprehensive Overview and Two Events Case Study in Saudi Arabia

Elmhamdi,

Roman,

Peñaloza-Murillo

et al. 2024

Atmosphere

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This paper is devoted to the analysis of air temperature and humidity changes during the two solar eclipses of 26 December 2019 and 21 June 2020 in Saudi Arabia based on data we collected from two different sites. We highlight the complexity of humidity’s response to a solar eclipse, which is quite different from temperature’s response. During the December event, the Sun rose already partially eclipsed, while for the June eclipse, it was only partial at Riyadh. This difference apparently affected the observed response on the recorded variables: temperature, relative humidity (RH), and vapor pressure (VP) in the two events. Changes in these variables went unnoticed for the first eclipse since they were within the natural variability of the day; yet for the other, they showed evident alterations in the slopes of the major parameters, which we analyze and discuss. A decrease in temperature of 3.2 °C was detected in Riyadh. However, RH and VP showed an oscillation that we explain taking into account a similar effect reported in other eclipses. We measured a time lag of about 15 min from the eclipse central phase in the city. Related fluctuations and dynamics from the computed rates of the temporal variation of temperature and RH are scrutinized. Furthermore, an overdue significant review of terrestrial atmospheric parameters is also offered in the context of the eclipse meteorology, particularly related to desert atmospheres. We also try to identify the influence of solar eclipses in similar environments doing a broad inter-comparison with other observations of these variables in the Near East, northern Africa, and in the United States. These inter-comparisons reveal how complex and dissimilar the response of the lower atmosphere to a solar eclipse can be within a desert environment and other similar environments.

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Annular Solar Eclipse on 26 December 2019 and its Effect on Trace Pollutant Concentrations and Meteorological Parameters in Kannur, India: a Coastal City

Ct¹,

Nishanth²,

Kumar³

et al. 2020

Asian J. Atmos. Environ

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This paper highlights the variations of surface ozone (O3), total column ozone (TCO), oxides of nitrogen (NO and NO2), carbon monoxide (CO), sulphur dioxide (SO2), ammonia (NH3), volatile organic compounds (Benzene, Tolune, Ethyle Benzene, Xylenes (collectively called BTEX)), particulate matters (PM10 and PM2.5), and meteorological parameters at the time of an annular solar eclipse on 26 December 2019 at Kannur town in Kerala, South India. The maximum solar obscuration has resulted a decrease in solar radiation by 93%, air temperature by 16.3%, wind speed by 36.1% and an increase in relative humidity by 27.1% at this coastal location. Along with the reduction in solar radiation, the concentration of surface O3 (61.5%) and total column O3 (11.8%) have been observed to decrease at the maximum phase of solar eclipse. CO and NO2 concentration were found to be increased by 28.9% and 42.2%, respectively, while NO exhibited its typical diurnal variation. Further, a decrease in concentrations of SO2 by 17.6%, PM10 by 18.5%, and PM2.5 by 11.3% were observed. NH3 and BTEX were found to be higher than 11.3% and 22.6% of the concentrations in control days. All of these deviated parameters could be seen returning to their normal state after completing the eclipse episode. The variation of photodissociation coefficient j(NO2) values were theoretically calculated from the observed data, which shows a good agreement with the model simulated j(NO2) reduction. This is an extensive second observation on the variation of trace pollutants on solar eclipse, after the partial solar eclipse observed on 15 January 2010 at Kannur.

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Study of atmospheric air pollutants during the partial solar eclipse on 15 January 2010 over Udaipur: A semi-arid location in Western India

Cited by 3 publications

References 27 publications

Effects of the annular eclipse on the surface O3 in yunnan province, China

Effects of the annular eclipse on the surface O3 in yunnan province, China

Impact of the Eclipsed Sun on Terrestrial Atmospheric Parameters in Desert Locations: A Comprehensive Overview and Two Events Case Study in Saudi Arabia

Annular Solar Eclipse on 26 December 2019 and its Effect on Trace Pollutant Concentrations and Meteorological Parameters in Kannur, India: a Coastal City

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