EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Strong isoprene emission response to temperature in tundra vegetation

Roger Seco1,2,3, Thomas Holst4, Cleo L. Davie-Martin2,3, Tihomir Simin2,3, Alex Guenther5, Norbert Pirk6, Janne Rinne4, and Riikka Rinnan2,3
Roger Seco et al.
  • 1Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
  • 2Department of Biology, University of Copenhagen, Copenhagen, Denmark
  • 3Center for Permafrost (CENPERM), University of Copenhagen, Copenhagen, Denmark
  • 4Department of Physical Geography & Ecosystem Science, Lund University, Lund, Sweden
  • 5Department of Earth System Science, University of California Irvine, Irvine CA, USA
  • 6Department of Geosciences, University of Oslo, Oslo, Norway

Biogenic emissions of volatile organic compounds (BVOCs) are a crucial component of biosphere-atmosphere interactions. In northern latitudes, climate change is amplified by feedback processes in which BVOCs have a recognized, yet poorly quantified role, mainly due to a lack of measurements and concomitant modelling gaps. Hence, current Earth system models mostly rely on temperature responses measured on vegetation from lower latitudes, rendering their predictions highly uncertain.

We used Proton Transfer Reaction -Time of Flight- Mass Spectrometry (PTR-TOF-MS) and eddy covariance to measure ecosystem-level isoprene fluxes at two contrasting ecosystems in Sweden and Norway during an entire growing season. Measured fluxes showed that tundra isoprene emissions responded vigorously to temperature increases, with Q10 temperature coefficients of up to 20.8; that is 3.5 times the Q10 derived from the equivalent model results. Our results demonstrate that tundra vegetation possesses the potential to substantially boost its isoprene emissions in response to future rising temperatures, at rates that exceed the current Earth system model predictions.

How to cite: Seco, R., Holst, T., Davie-Martin, C. L., Simin, T., Guenther, A., Pirk, N., Rinne, J., and Rinnan, R.: Strong isoprene emission response to temperature in tundra vegetation, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-10663,, 2022.