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000040851 0247_ $$2DOI$$a10.1029/2003JD004335
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000040851 1001_ $$0P:(DE-Juel1)VDB1438$$aSchmitgen, S.$$b0$$uFZJ
000040851 245__ $$aCarbon dioxide uptake of a forested region in southwest France derived from airborne CO2 and CO measurements in a quasi-Lagrangian experiment
000040851 260__ $$aWashington, DC$$bUnion$$c2004
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000040851 440_0 $$06393$$aJournal of Geophysical Research D: Atmospheres$$v109$$x0148-0227
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000040851 520__ $$aThis paper presents a Lagrangian budgeting approach to quantify the uptake of CO2 by vegetation at horizontal scales of several tens of kilometers. For this purpose, CO2 and meteorological parameters were measured from a small aircraft during four flights in June 2001 over a flat homogeneous and productive temperate forest in the Landes region ( southwestern France). Additional CO measurements were made in order to identify and quantify the potential influence of anthropogenic emissions on the net CO2 flux derived from the measurements. For one of four flights, Lagrangian conditions were nearly perfectly fulfilled. On average, the CO2 mixing ratio in the boundary layer decreased at a rate of 0.11 ppm km(-1), yielding an average CO2 uptake by the forest of 16 +/- 2.5 mumol m(-2) s(-1) between 1230 and 1430 UT. Our result is about 15% smaller than the local net ecosystem exchange measured by eddy covariance at a tower north of the flight domain and about 12% higher than a regional estimate based on remote sensing data for the whole experimental area. The contribution of anthropogenic emissions to the regional CO2 budget was estimated from the CO measurements to be to <0.5 mu mol m(-2) s(-1).
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000040851 65320 $$2Author$$acarbon dioxide flux
000040851 65320 $$2Author$$aregional CO2 budget
000040851 65320 $$2Author$$acarbon monoxide
000040851 7001_ $$0P:(DE-Juel1)16201$$aGeiss, H.$$b1$$uFZJ
000040851 7001_ $$0P:(DE-HGF)0$$aCiais, Ph.$$b2
000040851 7001_ $$0P:(DE-HGF)0$$aNeininger, B.$$b3
000040851 7001_ $$0P:(DE-HGF)0$$aBrunet, Y.$$b4
000040851 7001_ $$0P:(DE-HGF)0$$aReichstein, M.$$b5
000040851 7001_ $$0P:(DE-Juel1)16204$$aKley, D.$$b6$$uFZJ
000040851 7001_ $$0P:(DE-Juel1)6742$$aVolz-Thomas, A.$$b7$$uFZJ
000040851 773__ $$0PERI:(DE-600)2016800-7 $$a10.1029/2003JD004335$$gVol. 109, p. D14302$$pD14302$$q109<D14302$$tJournal of geophysical research / Atmospheres  $$tJournal of Geophysical Research$$v109$$x0148-0227$$y2004
000040851 8567_ $$uhttp://dx.doi.org/10.1029/2003JD004335
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