Comparing the Importance of Iodine and Isoprene on Tropospheric Photochemistry

R. J. Pound*, D. P. Durcan, M. J. Evans, L. J. Carpenter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Isoprene, arguably the most studied biogenically emitted gas, is thought to have a large impact on tropospheric composition. Other naturally emitted species have been considered to play a less important role. Here the GEOS-Chem model is used to compare the impacts of isoprene and iodine emissions on present-day tropospheric composition. Removing isoprene emissions leads to a 3.4 burden, a smaller absolute change than the 5.9+0.60.05 whereas isoprene has a substantial impact on both (−4.34.2. Isoprene emissions and chemistry are seen as essential for tropospheric chemistry models, but iodine is often not. We suggest that iodine should receive greater attention in model development and experimental research to allow improved predictions of past, present, and future tropospheric O3.
Original languageEnglish
Article numbere2022GL100997
Number of pages11
JournalGeophysical Research Letters
Issue number8
Early online date25 Apr 2023
Publication statusPublished - 28 Apr 2023

Bibliographical note

© 2023, The Authors.


  • iodine
  • isoprene
  • ozone
  • natural emissions

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