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| Titel |
Evaluation of a photosynthesis-based biogenic isoprene emission scheme in JULES and simulation of isoprene emissions under present-day climate conditions |
| VerfasserIn |
F. Pacifico, S. P. Harrison, C. D. Jones, A. Arneth, S. Sitch, G. P. Weedon, M. P. Barkley, P. I. Palmer, D. Serça, M. Potosnak, T.-M. Fu, A. Goldstein, J. Bai, G. Schurgers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 9 ; Nr. 11, no. 9 (2011-05-11), S.4371-4389 |
| Datensatznummer |
250009709
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| Publikation (Nr.) |
 copernicus.org/acp-11-4371-2011.pdf |
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| Zusammenfassung |
| 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. |
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