Evolution of tracer and ice crystal distribution in the young plumes of overshooting turrets from the StratoClim golden flight.
2 IEK-7 - Institut für Energie- und Klimaforschung - Stratosphäre
3 Department of Geophysical Sciences [Chicago]
4 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
5 IPA - Institute for Atmospheric Physics [Mainz]
6 ISAC - Istituto di Scienze dell'Atmosfera e del Clima [Roma]
7 INO-CNR - Istituto Nazionale di Ottica [Firenze]
8 CAO - Central Aerological Observatory
9 CSEM - Centre Suisse d'Electronique et de Microtechnique SA [Neuchatel]
10 UNIME - Université de Neufchätel
11 ESE - Department of Environmental Science and Engineering [Pasadena]
12 Institute for Atmospheric and Environmental Research [Wuppertal]
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Résumé
Deployment of the high-altitude M55-Geophysica aircraft in Kathmandu during Summer 2017 within StratoClim campaign has yielded a wealth of unique high-resolution measurements in the Asian Monsoon Anticyclone (AMA). In a particular flight (F8, 10 August 2017) the aircraft flew at the cold-point tropopause level through active overshoots and their outflows minutes to hours old. The measurements reveal up to 2500 ppmv of ice water above 17 km in large aggregated ice crystals up to 700 µm in diameter. Smaller crystals were observed as high as 18.8 km (410 K). Tracer and thermodynamical measurements show manifestations of vigorous vertical motions and provide evidence for ongoing mixing of tropospheric and stratospheric air around the tropopause. We use an ensemble of airborne and satellite measurements inside and downwind of convective overshoots together with trajectory modeling to characterize the impact of overshooting convection on the thermodynamical structure and chemical composition of the Asian tropopause layer. The effect of cross-tropopause convective transport on the Asian lower stratospheric water vapour is discussed.
