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Evaluation of a photosynthesis-based biogenic isoprene emission scheme in JULES and simulation of isoprene emissions under present-day climate conditions

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Author

  • F. Pacifico
  • S. P. Harrison
  • C. D. Jones
  • Almut Arneth
  • S. Sitch
  • G. P. Weedon
  • M. P. Barkley
  • P. I. Palmer
  • D. Serca
  • M. Potosnak
  • T. -M. Fu
  • A. Goldstein
  • J. Bai
  • Guy Schurgers
Show all

Summary, in English

We have incorporated a semi-mechanistic isoprene emission module into the JULES land-surface scheme, as a first step towards a modelling tool that can be applied for studies of vegetation - atmospheric chemistry interactions, including chemistry-climate feedbacks. Here, we evaluate the coupled model against local above-canopy isoprene emission flux measurements from six flux tower sites as well as satellite-derived estimates of isoprene emission over tropical South America and east and south Asia. The model simulates diurnal variability well: correlation coefficients are significant (at the 95% level) for all flux tower sites. The model reproduces day-to-day variability with significant correlations (at the 95% confidence level) at four of the six flux tower sites. At the UMBS site, a complete set of seasonal observations is available for two years (2000 and 2002). The model reproduces the seasonal pattern of emission during 2002, but does less well in the year 2000. The model overestimates observed emissions at all sites, which is partially because it does not include isoprene loss through the canopy. Comparison with the satellite-derived isoprene-emission estimates suggests that the model simulates the main spatial patterns, seasonal and inter-annual variability over tropical regions. The model yields a global annual isoprene emission of 535 +/- 9 TgC yr(-1) during the 1990s, 78% of which from forested areas.

Publishing year

2011

Language

English

Pages

4371-4389

Publication/Series

Atmospheric Chemistry and Physics

Volume

11

Issue

9

Document type

Journal article

Publisher

Copernicus GmbH

Topic

  • Physical Geography

Status

Published

ISBN/ISSN/Other

  • ISSN: 1680-7324