Atmos. Chem. Phys. Discuss., 10, 28311-28354, 2010
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Evaluation of a photosynthesis-based biogenic isoprene emission scheme in JULES and simulation of isoprene emissions under modern climate conditions
F. Pacifico1,2, S. P. Harrison2,3, C. D. Jones1, A. Arneth4, S. Sitch5, G. P. Weedon1, M. P. Barkley6,*, P. I. Palmer6, D. Serça7, M. Potosnak8, T.-M. Fu9, A. Goldstein10, J. Bai11, and G. Schurgers4
1Met Office Hadley Centre, Exeter EX1 3PB, UK
2School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK
3School of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia
4Department of Earth and Ecosystem Sciences, University of Lund, Lund 22362, Sweden
5School of Geography, University of Leeds, Leeds LS2 9JT, UK
6School of GeoSciences, University of Edinburgh, Edinburgh EH9 3JW, UK
7Laboratoire d'Aérologie, Université de Toulouse, Toulouse 31400, France
8DePaul University, Environmental Science Program, Chicago, IL 60614, USA
9Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University Beijing, China
10Department of Environmental Science, Policy, and Management, University of California at Berkeley, Berkeley CA 94720, USA
11Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
*now at: EOS Group, Department of Physics & Astronomy, University of Leicester, UK

Abstract. We have incorporated a semi-mechanistic isoprene emission module into the JULES land-surface scheme. 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. 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 during the 1990s of 380 ± 7 TgC yr−1.

Citation: Pacifico, F., Harrison, S. P., Jones, C. D., Arneth, A., Sitch, S., Weedon, G. P., Barkley, M. P., Palmer, P. I., Serça, D., Potosnak, M., Fu, T.-M., Goldstein, A., Bai, J., and Schurgers, G.: Evaluation of a photosynthesis-based biogenic isoprene emission scheme in JULES and simulation of isoprene emissions under modern climate conditions, Atmos. Chem. Phys. Discuss., 10, 28311-28354, doi:10.5194/acpd-10-28311-2010, 2010.
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