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000825123 1001_ $$0P:(DE-HGF)0$$aAñel, J. A.$$b0
000825123 245__ $$aGlobal distribution of CO<sub>2</sub> in the upper troposphere and stratosphere
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000825123 520__ $$aIn this study, we aim to reconstruct a relevant and new database of monthly zonal mean distribution of carbon dioxide (CO2) at global scale extending from the upper-troposphere (UT) to stratosphere (S). This product can be used for model and satellite validation in the UT/S, as a prior for inversion modelling and mainly to analyse a plausible feature of the stratospheric-tropospheric exchange as well as the stratospheric circulation and its variability. To do so, we investigate the ability of a Lagrangian trajectory model guided by ERA-Interim reanalysis to construct the CO2 abundance in the UT/S. From 10 year backward trajectories and tropospheric observations of CO2, we reconstruct upper-tropospheric and stratospheric CO2 over the period 2000–2010. The inter-comparisons of the reconstructed CO2 with mid-latitude vertical profiles measured by balloon samples as well as quasi-horizontal air samples from ER-2 aircraft during SOLVE and CONTRAIL campaigns exhibit a remarkable agreement. That demonstrates the potential of Lagrangian model to reconstruct CO2 in the UT/S. The zonal mean distribution exhibits relatively large CO2 in the tropical stratosphere due to the seasonal variation of the tropical upwelling of Brewer-Dobson circulation. During winter and spring, the tropical pipe is relatively isolated but is less narrow during summer and autumn so that high CO2 values are more readily transported out of the tropics to the mid- and high latitude stratosphere. The shape of the vertical profiles suggests that relatively high CO2 above 20 km altitude mainly enter the stratosphere through tropical upwelling. CO2 mixing ratio is relatively low in the polar and tropical regions above 25 km. On average the CO2 mixing ratio decreases with altitude by 6–8 ppmv from the UT to stratosphere (e.g. up to 35 km) and is nearly constant with altitude.
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000825123 7001_ $$0P:(DE-Juel1)169614$$aDiallo, Mohamadou Abdoulaye$$b1$$eCorresponding author$$ufzj
000825123 7001_ $$0P:(DE-HGF)0$$aLegras, Bernhard$$b2
000825123 7001_ $$0P:(DE-HGF)0$$aRay, Eric$$b3
000825123 7001_ $$0P:(DE-HGF)0$$aEngel, Andreas$$b4
000825123 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-17-3861-2017$$gp. 1 - 35$$n6$$p3861–3878$$tAtmospheric chemistry and physics$$v17$$x1680-7316$$y2016
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