Journal
ATMOSPHERIC RESEARCH
Volume 264, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2021.105777
Keywords
Formaldehyde; Volatile organic compounds; MAX-DOAS; Satellite observation; VOC reactivity
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA23020301]
- National Key Research and Development Program of China [2017YFC0210002, 2018YFC0213104]
- National Natural Science Foundation of China [51778596, 41977184]
- Anhui Science and Technology Major Project [18030801111]
- Major Projects of High Resolution Earth Observation Systems of National Science and Technology [05-Y30B01-9001-19/203]
- Youth Innovation Promotion Association of CAS [2021443]
- Young Talent Project of the Center for Excellence in Regional Atmospheric Environment, CAS [CERAE202004]
- Fundamental Research Funds for the Central Universities [JUSRP12042]
- Research Fund Program of Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality [GHML2021-102]
- Presidential Foundation of the Hefei Institutes of Physical Science, CAS, China-Spark [YZJJ2021QN06]
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Studies show that HCHO can serve as a proxy for VOCs, indirectly proving the reasonableness of using the HCHO/NO2 ratio to indicate ozone sensitivity.
Atmospheric formaldehyde (HCHO) is considered as one of significant oxidization intermediate of most volatile organic compounds (VOCs). Previous studies using HCHO/NO2 ratio for ozone formation sensitivity are based on the hypothesis that HCHO is a reliable indicator for total VOC reactivity (VOCR), while few studies focused on evaluating this hypothesis. To reassess this assumption, three fitting methods have been proposed for correlation analysis between the HCHO and VOCR, showing the Pearson correlation coefficient increased in the following order: logarithmic fitting < linear fitting < exponential fitting. Near-surface HCHO VMRs and the exponenttransformed VOCR showed good agreement during the entire daytime, indicating that HCHO concentrations primarily depend on VOCR, especially at midday and afternoon. High correlation coefficients are not only found between the HCHO and VOCR, but also between the HCHO and ozone formation potential (OFP), implying that HCHO is strongly influenced by the photochemical oxidation of VOCs and closely linked to ozone formation. Furthermore, good consistencies were exhibited between TROPOMI HCHO VCDs and the calculated photochemical property parameters of NMHCs (e.g., Total NMHCs, VOCR, and OFP), suggesting that satellite-based HCHO columns can infer the VOCs emissions over large spatial areas. We also make an attempt to convert the concentration of HCHO to total Prop-equiv concentration of NMHCs based on the linear regression analysis method, which overestimates the measured values by about 16%. Our findings imply that HCHO has the feasibility being a proxy for VOCs, which also indirectly proves the reasonability of HCHO/NO2 ratio to indicate ozone sensitivity.
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