Preprints
https://doi.org/10.5194/egusphere-2024-79
https://doi.org/10.5194/egusphere-2024-79
12 Jan 2024
 | 12 Jan 2024

Deciphering anthropogenic and biogenic contributions to selected NMVOC emissions in an urban area

Arianna Peron, Martin Graus, Marcus Striednig, Christian Lamprecht, Georg Wohlfahrt, and Thomas Karl

Abstract. The anthropogenic and biogenic contributions of isoprene, monoterpenes, sesquiterpenes and methanol in an urban area were estimated based on direct eddy covariance flux observations during four campaigns between 2018 and 2021. While these compounds are typically thought to be dominated by biogenic sources on regional and global scales, the role of potentially significant anthropogenic emissions in urban areas has been recently debated. Typical fluxes of isoprene, monoterpenes and sesquiterpenes were on the order of 0.09 nmol m−2 s−1, 0.09 nmol m−2 s−1 and 0.003 nmol m−2 s−1 during spring. During summer, emission fluxes of isoprene, monoterpenes and sesquiterpenes were higher on the order of 0.85 nmol m−2 s−1, 0.11 nmol m−2 s−1, 0.004 nmol m−2 s−1. It was found that the contribution of the anthropogenic part is strongly seasonally dependent. For isoprene the anthropogenic fraction can be as high as 64 % in spring, but is typically very low < 18 % during the summer season. For monoterpenes the anthropogenic fraction was estimated between 43 % in spring and less than 20 % in summer.

With values of 2.8 nmol m−2 s−1 in spring and 3.2 nmol m−2 s−1 in summer, methanol did not exhibit a significant seasonal variation of observed surface fluxes. However, there was a difference in emissions between weekdays and weekends (about 2.3 times higher on weekdays in spring). This suggests that methanol emissions are likely influenced by anthropogenic activities during all seasons.

Arianna Peron, Martin Graus, Marcus Striednig, Christian Lamprecht, Georg Wohlfahrt, and Thomas Karl

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-79', Anonymous Referee #1, 31 Jan 2024
  • RC2: 'Comment on egusphere-2024-79', Anonymous Referee #2, 01 Feb 2024
Arianna Peron, Martin Graus, Marcus Striednig, Christian Lamprecht, Georg Wohlfahrt, and Thomas Karl
Arianna Peron, Martin Graus, Marcus Striednig, Christian Lamprecht, Georg Wohlfahrt, and Thomas Karl

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Short summary
The anthropogenic fraction of NMVOC emissions typically associated with biogenic sources (e.g. terpenes) is investigated in an urban area based on direct eddy covariance observations. We find that the anthropogenic fraction for terpene emissions is strongly dependent on the season. When analyzing VCP emissions in context of urban environments we caution that short-term campaign-based observations might over- or underestimate their significance depending on local and seasonal circumstances.