[Distribution Characteristics of Near Surface Ozone Volume Fraction in Shanxi Province Based on Atmospheric Composition Observation Network].
Huan Jing Ke Xue
; 45(2): 655-667, 2024 Feb 08.
Article
en Zh
| MEDLINE
| ID: mdl-38471906
ABSTRACT
Based on the continuous data of O3ï¼ NOï¼ NO2ï¼ and NOx and the meteorological data from March 2019 to February 2020 at six atmospheric composition observation stations in Shanxi Provinceï¼ the characteristics and influence factors of O3 volume fractions were studied using statistical analysis and backward trajectory analysis. The results showed that O3 volume fractions were generally higher from April to September and lower from October to the following March. During the study periodï¼ O3 pollution represented by φï¼MDA8O3ï¼ï¼ i.e.ï¼ the maximum daily 8-h average of O3 volume fractionsï¼ was the most serious at the Jincheng and Linfen stations in the south of Shanxiï¼ followed by that in the Wutaishanï¼ Shuozhouï¼ and Datong stations in the northï¼ with the least pollution occurring at the Taiyuan station in the middle. There were differences between the urban and alpine stationsï¼ although their seasonal O3 volume fractions were both summer > spring > autumn > winter. O3 volume fractions at the urban station were usually lower than those at the alpine stationï¼ O3 at the urban station might have been influenced by photochemical reactions with precursor NOxï¼ howeverï¼ this was not the main source of high O3 at the alpine station. The peak and valley values appeared at 15ï¼00 and 06ï¼00ï¼ respectivelyï¼ at the urban stationï¼ whereas they appeared at 20ï¼00 and 10ï¼00ï¼ respectivelyï¼ at the alpine stationï¼ representing diametrically opposite diurnal variation patterns. Furtherï¼ the daily amplitude of O3 at the urban station was much larger than that at the alpine station. For urban stations specificallyï¼ temperature was the most important meteorological factor affecting O3 volume fractionï¼ compared with sunlight hoursï¼ precipitationï¼ and total cloud cover. The NO2 volume fraction in the daytime affected the daily amplitude of O3ï¼ although the photochemical generation potential of O3 at the Taiyuan station was goodï¼ the O3 volume fractions were the lowest among urban stations due to strong NO titration. The higher O3 corresponded to lower NOx in which NO2 was dominantï¼ and the higher NOx was largely composed of NOï¼ under which conditions O3 would be depleted completely. The surface wind that affected O3 volume fractions of all stations primarily came from the southeastï¼ southï¼ and southwestï¼ and specific wind speed led to the increase in O3 volume fraction. The geographical situation of the station would cause the difference in the transport of atmospheric pollutantsï¼ whereas the horizontal transmissions of high O3 from the North China Plain and Fenwei Plain were likely to be the common reason for the increase in O3 volume fraction in Shanxi.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
Zh
Revista:
Huan Jing Ke Xue
/
Huanjing Kexue
Año:
2024
Tipo del documento:
Article
País de afiliación:
China