Spectral Remote Sensing of NO<sub>2</sub> Vertical Profile Variation Difference in Beijing During Major Events and Holidays

Jian Chen; Chengzhi Xing; Jinan Lin; Cheng Liu

doi:10.3788/AOS240638

Acta Optica Sinica, Volume. 44, Issue 24, 2401005(2024)

Spectral Remote Sensing of NO₂ Vertical Profile Variation Difference in Beijing During Major Events and Holidays

Jian Chen¹, Chengzhi Xing^2、*, Jinan Lin², and Cheng Liu^1,2

¹Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, Anhui , China

²Key Laboratory of Environmental Optics & Technology, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui , China

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Figures & Tables(11)

Fig. 1. MAX-DOAS station

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$Correlations between MAX-DOAS NO2 volume fraction and CNEMC NO2 mass concentration$

Fig. 2. Correlations between MAX-DOAS NO₂ volume fraction and CNEMC NO₂ mass concentration

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$Time series of NO2 volume fraction at 0‒200 m, 400‒600 m, and 800‒1000 m height layers from June 2020 to May 2022$

Fig. 3. Time series of NO₂ volume fraction at 0‒200 m, 400‒600 m, and 800‒1000 m height layers from June 2020 to May 2022

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$Seasonal averaged vertical profiles of NO2 volume fraction, and the shadow represents standard deviation. (a) Spring; (b) summer; (c) autumn; (d) winter$

Fig. 4. Seasonal averaged vertical profiles of NO₂ volume fraction, and the shadow represents standard deviation. (a) Spring; (b) summer; (c) autumn; (d) winter

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$Averaged diurnal variations of NO2 volume fraction in different seasons. (a) Spring; (b) summer; (c) autumn; (d) winter$

Fig. 5. Averaged diurnal variations of NO₂ volume fraction in different seasons. (a) Spring; (b) summer; (c) autumn; (d) winter

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Fig. 6. Averaged diurnal variations of boundary layer height in different seasons

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$Averaged vertical profiles and averaged diurnal variations of NO2 volume fraction. (a)(b) Weekdays; (c)(d) Saturday; (e)(f) Sunday$

Fig. 7. Averaged vertical profiles and averaged diurnal variations of NO₂ volume fraction. (a)(b) Weekdays; (c)(d) Saturday; (e)(f) Sunday

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$Averaged vertical profiles and averaged diurnal variations of NO2 volume fraction. (a)(b) All observation periods; (c)(d) holidays; (e)(f) major events$

Fig. 8. Averaged vertical profiles and averaged diurnal variations of NO₂ volume fraction. (a)(b) All observation periods; (c)(d) holidays; (e)(f) major events

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Fig. 9. WPSCF distribution of NO₂ in the bottom layer (0‒20 m). (a) February 2021; (b) February 2022

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Table 1. Detailed parameter settings of DOAS inversion for NO₂

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Table 1. Detailed parameter settings of DOAS inversion for NO₂

Parameter	Data source
NO₂	Vandaele et al.^[32], 1998, 294 K
HCHO	Meller and Moortgat^[33], 2000, 297 K
O₃	Serdyuchenko et al.^[34], 2014, 223 K
O₃	Serdyuchenko et al.^[34] , 2014, 243 K
O₄	Thalman and Volkamer^[35], 2013, 293 K
BrO	Fleischmann et al.^[36], 2004, 223 K
Ring	Ring spectra calculated with QDOAS, according to Chance and Spurr^[37], 1997
Polynomial degree	Order5
Intensity offset	Constant

Table 2. Major events and holidays during the observation period

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Table 2. Major events and holidays during the observation period

Type	Event/holiday	Time period
Major event	Winter Olympics	2022‒02‒04—02‒20
Major event	Paralympic Winter Games	2022‒03‒04—03‒13
Holiday	Dragon Boat Festival	2020‒06‒25—06‒27; 2021‒06‒12—12‒14
	Qingming Festival	2021‒04‒03—04‒05; 2022‒04‒03—04‒05
	International Labor Day	2021‒05‒01—05‒05; 2022‒04‒30—05‒04
	Mid-Autumn Festival	2021‒09‒19—09‒21
	National Day	2020‒10‒01—10‒08; 2021‒10‒01—10‒07
	New Year’s Day	2021‒01‒01—01‒03; 2022‒01‒01—01‒03
	Spring Festival	2021‒02‒11—02‒17; 2022‒01‒31—02‒06

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Jian Chen, Chengzhi Xing, Jinan Lin, Cheng Liu. Spectral Remote Sensing of NO₂ Vertical Profile Variation Difference in Beijing During Major Events and Holidays[J]. Acta Optica Sinica, 2024, 44(24): 2401005

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