Preprints
https://doi.org/10.5194/acp-2021-851
https://doi.org/10.5194/acp-2021-851

  03 Nov 2021

03 Nov 2021

Review status: this preprint is currently under review for the journal ACP.

Interannual Variability of BVOC Emissions in an Alpine City

Lisa Kaser1, Arianna Peron1, Martin Graus1, Marcus Striednig1, Georg Wohlfahrt2, Stanislav Juráň3, and Thomas Karl1 Lisa Kaser et al.
  • 1Department of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innrain 52f, 6020 Innsbruck, Austria
  • 2Department of Ecology, University of Innsbruck, Sternwartestrasse. 15, 6020 Innsbruck, Austria
  • 3Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00 Brno, Czech Republic

Abstract. Terpenoid emissions above urban areas are a complex mix of biogenic and anthropogenic emission sources. In line with previous studies we found that summertime terpenoid emissions in an alpine city were dominated by biogenic sources, but especially at lower temperatures the anthropogenic influences were non-negligible. Inter-seasonal emission measurements revealed consistency for monoterpenes and sesquiterpenes, but a large difference in isoprene between the summers 2015 and 2018. Standardized emission potentials for monoterpenes and sesquiterpenes were 0.12 nmol m-2 s-1 and 3.0·10-3 nmol m-2 s-1 in 2015 and 0.11 nmol m-2 s-1 and 3.4·10-3 nmol m-2 s-1 in 2018, respectively. Observed isoprene emissions were about four times higher in 2018 than in 2015. This factor decreased to 2.3 after standardizing isoprene emissions to 30 °C air temperature and photosynthetic active radiation (PAR) of 1000 μmol m-2 s-1. Based on emission model parameterizations, increased leaf temperatures can explained ~50 % of these differences, but standard emission potentials remained higher in 2018, when a heat wave persisted. Potential other reasons for the differences such as emission parameterization, footprint changes, water stress conditions and tree trimming are investigated.

Lisa Kaser et al.

Status: open (until 15 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-851', Anonymous Referee #1, 18 Nov 2021 reply
  • RC2: 'Comment on acp-2021-851', Anonymous Referee #2, 01 Dec 2021 reply

Lisa Kaser et al.

Lisa Kaser et al.

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Short summary
Biogenic volatile organic compounds (e.g. terpenoids) play an essential role in atmospheric chemistry. Urban greening activities need to consider the ozone and aerosol forming potential of these compounds released from vegetation. NMVOC emissions in urban environments are complex, and the biogenic component remains poorly quantified. We find that for summer conditions biogenic emissions dominate terpene emissions and that heat waves can significantly modulate urban biogenic terpenoid emissions.
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