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. 2023 May 15;11(1):nwad138. doi: 10.1093/nsr/nwad138

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© The Author(s) 2023. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — Chemical composition of OOMs observed in different conditions at CHC in January 2018. (a) and (b) Concentrations of OOMs containing (a) carbon, hydrogen and oxygen atoms (CHO) and (b) carbon, hydrogen, oxygen and nitrogen atoms (CHON) averaged over all FT events. OOMs are grouped with different oxygen atom numbers as a function of carbon atom numbers. Note that the contribution of a nitrate (-ONO₂) functional group to OOM volatility is comparable to an alcohol (-OH) group due to the same effective O : C ratio [29]. (c) and (d) Concentrations of (c) CHO and (d) CHON OOMs averaged over ‘non-FT’ periods during night-time (19 : 00–06 : 00). (e) and (f) Concentrations of (e) CHO and (f) CHON OOMs averaged over daytime (07 : 00–18 : 00) when CHC was affected by BL air from the nearby La Paz—El Alto metropolitan area. (g) Correlation between C_4-5 CHO and C_4-5 CHON in January 2018 (including both daytime and night-time data), colored by the WVMR. Here the FT events are indicated by lower WVMR and higher OOM concentrations.