A fully integrated isoprenoid emissions model coupling emissions to photosynthetic characteristics

Rüdiger Grote*, Catherine Morfopoulos, Ülo Niinemets, Zhihong Sun, Trevor F. Keenan, Federica Pacifico, Tim Butler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The lack of a mechanistic basis has hampered modelling isoprene emission responses to environmental drivers, in particular the simulation of isoprene emissions under different CO₂ concentrations. Here, we advance previous semi-mechanistic model formulations by introducing a model that explicitly links electron availability for other purpose than carbon assimilation (or available energy for secondary metabolism processes; supply-constraint) and enzyme activity (capacity-constraint) to emissions. We furthermore investigate the sensitivity of the model to variations in photosynthetic and emission-specific parameters. By comparing species-specific simulations with experimental data, we demonstrate that differences in photosynthetic characteristics can explain inter-species differences in emissions. Interestingly, the seasonal development of emissions could also be explained to some degree by the change in energy supply from photosynthesis throughout the season. In addition, we show that the principal responses are not limited to isoprene but can be formulated to describe the emission of other light-dependent volatile species. The proposed model is suitable for implementation into regional and global models, particularly those that already provide species-specific photosynthesis estimates.

Original languageEnglish
Pages (from-to)1965-1980
Number of pages16
JournalPlant, Cell and Environment
Volume37
Issue number8
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Biogenic emission modelling
  • Environmental sensitivity
  • Model evaluation
  • Photosynthetic electron transport

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