Preprints
https://doi.org/10.5194/amt-2021-117
https://doi.org/10.5194/amt-2021-117

  03 May 2021

03 May 2021

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

First Eddy Covariance Flux Measurements of Semi Volatile Organic Compounds with the PTR3-TOF-MS

Lukas Fischer1, Martin Breitenlechner1,a, Eva Canaval1, Wiebke Scholz1,4, Marcus Striednig2, Martin Graus2, Thomas G. Karl2, Tuukka Petäjä3, Markku Kulmala3, and Armin Hansel1 Lukas Fischer et al.
  • 1Institute for Ion Physics and Applied Physics, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
  • 2ACINN, Institute of Atmospheric and Cryospheric Science, University of Innsbruck, Austria
  • 3Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
  • 4Ionicon Analytik Ges. m. b. H., Eduard-Bodem-Gasse 3, 6020 Innsbruck, Austria
  • apresent address: University of Colorado Cooperative Institute for Research in Environmental Sciences (CIRES) at the NOAA Chemical Sciences Laboratory (CSL) Boulder, Colorado USA

Abstract. We present first eddy covariance flux measurements with the PTR3-TOF-MS, a novel proton-transfer-reaction mass-spectrometer (PTR-MS). During three weeks in spring 2016 the instrument recorded 10 Hz BVOC data on top of the SMEAR II tower in Hyytiälä, Finland. Flux and concentration data of isoprene, monoterpenes and sesquiterpenes were compared to the literature. Due to the improved instrument sensitivity and a customized “wall less” inlet design we could detect a number of fluxes of semi-volatile and low volatile organic compounds (SVOC and LVOC) with less than single digit picomol/m2/s values for the first time. These compounds include sesquiterpene oxidation products and diterpenes. Daytime diterpene fluxes were in the range of 0.05 to 0.15 picomol/m2/s, which amounts to about 0.25 % to 0.5 % of the daytime sesquiterpene flux above canopy.

Lukas Fischer et al.

Status: open (until 28 Jun 2021)

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Lukas Fischer et al.

Lukas Fischer et al.

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Short summary
Ecosystems emit biogenic volatile organic compounds (BVOC), which are then oxidized in the atmosphere contributing to ozone and secondary aerosol formation. While flux measurements of BVOC are state of the art, flux measurements of the less volatile oxidation products are difficult to achieve due to inlet losses. Here we present first flux measurements utilizing a novel PTR3 instrument in combination with a specially designed “wall-less” inlet we put on top of the Hyytiälä tower in Finland.