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Estimation des sources et puits du dihydrogène troposphérique : développements instrumentaux, mesures atmosphériques et assimilation variationnelle

Abstract : The scope of this PhD is to improve the knowledge of the tropospheric molecular hydrogen (H2) budget based on experimental and modeling approaches. During my master degree internship, a gas chromatograph measuring the mixing ratio of H2 and CO samples from the RAMCES network has been installed. The analyze of the in-situ measurements at Gif-sur-Yvette allows estimating the soil sink of this area (0.027 cm s−1) and the H2/CO ratio (0.5) from transport emissions. The tall tower of Trainou located near the Orléans forest (100 km south west of Paris) was instrumented in October 2008 for H2 and CO at three different heights (50, 100 and 180 m), in May 2009 for 222Rn at 180 m and in April 2010 for 222Rn at 50 m. With three different heights, local to regional air masses can be sampled. The in fluence of the traffi c at Trainou is not visible but during winter, we observe high correlated H2 and CO mixing ratios. The mean soil sink estimated with the same method as for Gif-sur-Yvette reaches 0.026 cm s−1. On the modelling side, the H2 mixing ratio measurements from RAMCES and EUROHYDROS were used in the system LMDz-PYVAR-SACS. This modelling framework allows optimizing the quantitative estimate of sources and sinks of H2 : the atmospheric transport model LMDz is coupled with the simplifi ed chemistry scheme SACS, and integrated in the PYVAR inversion system. Several scenarios, implementing the progressive separation of the different sources and sinks, have been tested at a global and european scale. The best H2 soil sink estimate reaches 59 ± 5 Tg an−1.
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https://tel.archives-ouvertes.fr/tel-00633825
Contributor : Camille Yver <>
Submitted on : Wednesday, October 19, 2011 - 3:15:12 PM
Last modification on : Thursday, August 6, 2020 - 4:32:19 PM
Long-term archiving on: : Friday, January 20, 2012 - 10:27:20 AM

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Camille Yver. Estimation des sources et puits du dihydrogène troposphérique : développements instrumentaux, mesures atmosphériques et assimilation variationnelle. Océan, Atmosphère. Université de Versailles-Saint Quentin en Yvelines, 2010. Français. ⟨tel-00633825⟩

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