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- Title
Ozone seasonal evolution and photochemical production regime in the polluted troposphere in eastern China derived from high-resolution Fourier transform spectrometry (FTS) observations.
- Authors
Sun, Youwen; Liu, Cheng; Palm, Mathias; Vigouroux, Corinne; Notholt, Justus; Hu, Qihou; Jones, Nicholas; Wang, Wei; Su, Wenjing; Zhang, Wenqiang; Shan, Changong; Tian, Yuan; Xu, Xingwei; De Mazière, Martine; Zhou, Minqiang; Liu, Jianguo
- Abstract
The seasonal evolution of O3 and its photochemical production regime in a polluted region of eastern China between 2014 and 2017 has been investigated using observations. We used tropospheric ozone (O3), carbon monoxide (CO), and formaldehyde (HCHO, a marker of VOCs (volatile organic compounds)) partial columns derived from high-resolution Fourier transform spectrometry (FTS); tropospheric nitrogen dioxide (NO2, a marker of NOx (nitrogen oxides)) partial column deduced from the Ozone Monitoring Instrument (OMI); surface meteorological data; and a back trajectory cluster analysis technique. A broad O3 maximum during both spring and summer (MAM/JJA) is observed; the day-to-day variations in MAM/JJA are generally larger than those in autumn and winter (SON/DJF). Tropospheric O3 columns in June are 1.55 x 1018 molecules cm-2 (56DU (Dobson units)), and in December they are 1.05 x 1018 molecules cm-2 (39 DU). Tropospheric O3 columns in June were *** 50% higher than those in December. Compared with the SON/DJF season, the observed tropospheric O3 levels in MAM/JJA are more influenced by the transport of air masses from densely populated and industrialized areas, and the high O3 level and variability in MAM/JJA is determined by the photochemical O3 production. The tropospheric-column HCHO/NO2 ratio is used as a proxy to investigate the photochemical O3 production rate (PO3). The results show that the PO3 is mainly nitrogen oxide (NOx) limited in MAM/JJA, while it is mainly VOC or mixed VOC--NOx limited in SON/DJF. Statistics show that NOx-limited, mixed VOC--NOx-limited, and VOC-limited PO3 accounts for 60.1 %, 28.7 %, and 11% of days, respectively. Considering most of PO3 is NOx limited or mixed VOC--NOx limited, reductions in NOx would reduce O3 pollution in eastern China.
- Subjects
CHINA; PHOTOCHEMISTRY; TROPOSPHERIC ozone; TROPOSPHERE; FOURIER transform spectroscopy; OZONE; CARBON monoxide; VOLATILE organic compounds
- Publication
Atmospheric Chemistry & Physics, 2018, Vol 18, Issue 19, p14569
- ISSN
1680-7316
- Publication type
Academic Journal
- DOI
10.5194/acp-18-14569-2018