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| Titel |
Predicting and partitioning ozone fluxes to maize crops from sowing to harvest: the Surfatm-O3 model |
| VerfasserIn |
P. Stella, E. Personne, B. Loubet, E. Lamaud, E. Ceschia, P. Beziat, J. M. Bonnefond, M. Irvine, P. Keravec, N. Mascher, P. Cellier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 10 ; Nr. 8, no. 10 (2011-10-12), S.2869-2886 |
| Datensatznummer |
250006159
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| Publikation (Nr.) |
 copernicus.org/bg-8-2869-2011.pdf |
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| Zusammenfassung |
| Terrestrial ecosystems represent a major sink for ozone (O3) and also a
critical control of tropospheric O3 budget. However, due to its
deleterious effects, plant functioning is affected by the ozone absorbed. It
is thus necessary to both predict total ozone deposition to ecosystems and
partition the fluxes in stomatal and non-stomatal pathways. The
Surfatm-O3 model was developed to predict ozone deposition to
agroecosystems from sowing to harvest, taking into account each deposition
pathways during bare soil, growth, maturity, and senescence periods. An
additional sink was added during senescence: stomatal deposition for yellow
leaves, not able to photosynthesise but transpiring. The model was
confronted to measurements performed over three maize crops in different
regions of France. Modelled and measured fluxes agreed well for one dataset
for any phenological stage, with only 4% difference over the whole
cropping season. A larger discrepancy was found for the two other sites,
15% and 18% over the entire study period, especially during bare soil,
early growth and senescence. This was attributed to site-specific soil
resistance to ozone and possible chemical reactions between ozone and
volatile organic compounds emitted during late senescence. Considering both
night-time and daytime conditions, non-stomatal deposition was the major
ozone sink, from 100% during bare soil period to 70–80% on average
during maturity. However, considering only daytime conditions, especially
under optimal climatic conditions for plant functioning, stomatal flux could
represent 75% of total ozone flux. This model could improve estimates of
crop yield losses and projections of tropospheric ozone budget. |
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