Submitted as: model description paper
01 Jul 2022
Submitted as: model description paper | 01 Jul 2022
Status: this preprint is currently under review for the journal GMD.

Isoprene and monoterpene simulations using the chemistry-climate model EMAC (v2.55) with interactive vegetation from LPJ-GUESS (v4.0)

Ryan Vella1,2, Matthew Forrest3, Jos Lelieveld1,4, and Holger Tost2 Ryan Vella et al.
  • 1Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
  • 2Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
  • 3Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
  • 4Climate and Atmosphere Research Center, The Cyprus Institute, Nicosia, Cyprus

Abstract. Earth system models (ESMs) integrate previously separate models of the ocean, atmosphere and vegetation in one comprehensive modelling system enabling the investigation of interactions between different components of the Earth system. Global isoprene and monoterpene emissions from terrestrial vegetation, which represents the most important source of VOCs in the Earth system, need to be included in global and regional chemical transport models given their major chemical impacts on the atmosphere. Due to the feedbacks of vegetation activity involving interactions with the weather and climate, a coupled modelling system between vegetation and atmospheric chemistry is a recommended tool to address the fate of biogenic volatile organic compounds (BVOCs). In this work, we present further development in linking LPJ-GUESS, a global dynamic vegetation model, to the atmospheric chemistry-enabled atmosphere-ocean general circulation model EMAC. We evaluate terrestrial BVOC emission estimates from the submodels ONEMIS and MEGAN in EMAC with (1) prescribed climatological vegetation boundary conditions at the land-atmosphere interface; and (2) dynamic vegetation states calculated in LPJ-GUESS (replacing the offline vegetation inputs). LPJ-GUESS-driven global emission estimates for isoprene and monoterpenes from the submodel ONEMIS were found to be 546 Tg yr-1 and 102 Tg yr-1, respectively. MEGAN prescribed 657 Tg and 55 Tg of isoprene and monoterpene emissions annually. We also evaluated the sensitivity of the new coupled system in doubling CO2 scenarios. This work provides evidence that the new coupled model yields suitable estimates for global BVOC emissions that are responsive to vegetation dynamics. We conclude that the proposed model setup is a useful tool for studying land-biosphere-atmosphere interactions in the Earth system.

Ryan Vella et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-154', Anonymous Referee #1, 12 Aug 2022
  • RC2: 'Comment on gmd-2022-154', Anonymous Referee #2, 17 Aug 2022
  • AC1: 'Comment on gmd-2022-154', Ryan Vella, 06 Sep 2022

Ryan Vella et al.

Ryan Vella et al.


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Short summary
Biogenic volatile organic compounds (BVOC) are released by vegetation and have a major impact on atmospheric chemistry and aerosol formation. Non-interacting vegetation constraints the majority of numerical models used to estimate global BVOC emissions and thus the effects of changing vegetation on emissions are not addressed. In this work, we replace the offline vegetation with dynamic vegetation states by linking a chemistry-climate model with a global dynamic vegetation model.