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| Titel |
CO2 budgeting at the regional scale using a Lagrangian experimental strategy and meso-scale modeling |
| VerfasserIn |
C. Sarrat, J. Noilhan, P. Lacarrère, V. Masson, E. Ceschia, P. Ciais, A. Dolman, J. Elbers, C. Gerbig, N. Jarosz |
| 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 ; 6, no. 1 ; Nr. 6, no. 1 (2009-01-22), S.113-127 |
| Datensatznummer |
250003319
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| Publikation (Nr.) |
 copernicus.org/bg-6-113-2009.pdf |
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| Zusammenfassung |
An atmospheric Lagrangian experiment for regional CO2 budgeting with
aircraft measurements took place during the CarboEurope Regional Experiment Strategy campaign (CERES) in south-west France, in June 2005. The atmospheric CO2 aircraft measurements taken upstream and downstream of an
active and homogeneous pine forest revealed a CO2 depletion in the same
air mass, using a Lagrangian strategy. This field experiment was analyzed
with a meteorological meso-scale model interactively coupled with a surface
scheme, with plant assimilation, ecosystem respiration, anthropogenic CO2
emissions and sea fluxes. First, the model was carefully validated against
observations made close to the surface and in the atmospheric boundary layer.
Then, the carbon budget was evaluated using the numerous CERES observations,
by upscaling the surface fluxes observations, and using the modeling results,
in order to estimate the relative contribution of each physical process.
A good agreement is found between the two methods which use the same vegetation
map: the estimation of the regional CO2 surface flux by the Eulerian
meso-scale model budget is close to the budget deduced from the
upscaling of the observed surface fluxes, and found a budget between −9.4
and −12.1 μmol.m−2.s−1, depending on the size of the considered area.
Nevertheless, the associated uncertainties are rather large for the upscaling
method and reach 50%. A third method, using Lagrangian observations of CO2
estimates a regional CO2 budget a few different and more scattered,
(−16.8 μmol.m−2.s−1 for the small sub-domain and −8.6 μmol.m−2.s−1 for the larger one). For this budgeting
method, we estimate a mean of 31% error, mainly arising from the time
of integration between the two measurements of the Lagrangian experiment.
The paper describes in details the three methods to assess the regional CO2 budget and the associated errors. |
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