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Investigating the Effect of Different Meteorological Conditions on MAX-DOAS Observations of NO2 and CHOCHO in Hefei, China

1
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2
Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
3
Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
4
Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei 230026, China
5
Department of Meteorology, COMSATS University Islamabad, Islamabad 44000, Pakistan
*
Authors to whom correspondence should be addressed.
Atmosphere 2019, 10(7), 353; https://doi.org/10.3390/atmos10070353
Received: 9 May 2019 / Revised: 20 June 2019 / Accepted: 22 June 2019 / Published: 27 June 2019
(This article belongs to the Special Issue Lower Atmosphere Meteorology)
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Abstract

In this work, a ground-based remote sensing instrument was used for observation of the trace gases NO2 and CHOCHO in Hefei, China. Excessive development and rapid economic growth over the years have resulted in the compromising of air quality in this city, with haze being the most prominent environmental problem. This is first study covering observation of CHOCHO in Hefei (31.783° N, 117.201° E). The observation period of this study, i.e., July 2018 to December 2018, is divided into three different categories: (1) clear days, (2) haze days, and (3) severe haze days. The quality of the differential optical absorption spectroscopy (DOAS) fit for both CHOCHO and NO2 was low during severe haze days due to a reduced signal to noise ratio. NO2 and CHOCHO showed positive correlations with PM2.5, producing R values of 0.95 and 0.98, respectively. NO2 showed strong negative correlations with visibility and air temperature, obtaining R values of 0.97 and 0.98, respectively. CHOCHO also exhibited strong negative correlations with temperature and visibility, displaying R values of 0.83 and 0.91, respectively. The average concentration of NO2, CHOCHO, and PM2.5 during haze days was larger compared to that of clear days. Diurnal variation of both CHOCHO and NO2 showed a significant decreasing trend in the afternoons during clear days due to photolysis, while during haze days these two gases started to accumulate as their residence time increases in the absence of photolysis. There was no prominent weekly cycle for both trace gases. View Full-Text
Keywords: MAX-DOAS; CHOCHO; NO2; meteorological conditions; haze days MAX-DOAS; CHOCHO; NO2; meteorological conditions; haze days
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Javed, Z.; Liu, C.; Ullah, K.; Tan, W.; Xing, C.; Liu, H. Investigating the Effect of Different Meteorological Conditions on MAX-DOAS Observations of NO2 and CHOCHO in Hefei, China. Atmosphere 2019, 10, 353.

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