EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Evolution of tracer and ice crystal distribution in the young plumes of overshooting turrets from the StratoClim golden flight 

Sergey Khaykin1, Martina Krämer2,3, Elizabeth Moyer4, Silvia Bucci6,7, Armin Afchine2, Stephan Borrmann3, Francesco Cairo8, Benjamin Clouser4, Francesco D’Amato10, Bernard Legras6, Alexey Lykov5, Valentin Mitev11, Renaud Matthey12, Christian Rolf2, Clare Singer9, Alexey Ulanovsky5, Silvia Viciani10, Michael Volk13, Vladimir Yushkov5, and Fred Stroh2
Sergey Khaykin et al.
  • 1UVSQ/CNRS, LATMOS, Guyancourt, France (
  • 2Institute for Energy and Climate Research (IEK-7), Research Center Jülich, Jülich, Germany (
  • 3Institute for Atmospheric Physics (IPA), Johannes Gutenberg University, Mainz, Germany (
  • 4Dept. of the Geophysical Sciences, Univ. of Chicago (
  • 5Central Aerological Observatory (CAO), Department of Upper Atmospheric Layers Physics, Moscow, Russia (
  • 6Laboratoire de Météorologie Dynamique, UMR CNRS 8539, IPSL, PSL-ENS/Sorbonne Univ./Ecole Polytechnique, Paris, France (
  • 7University of Vienna, Vienna, Austria (
  • 8Institute of Atmospheric Sciences and Climate, ISAC-CNR, Rome, Italy (
  • 9California Institute of Technology, Department of Environmental Science and Engineering, Pasadena, U.S. (
  • 10National Institute of Optics, CNR-INO, Sesto Fiorentino, Italy (
  • 11Centre Suisse d’Electronique et de Microtechnique, CSEM SA, Neuchâtel, Switzerland (
  • 12Institut de Physique, Université de Neuchâtel, Neuchâtel, Switzerland ( )
  • 13Institute for Atmospheric and Environmental Research, University of Wuppertal, Wuppertal, Germany (

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.

How to cite: Khaykin, S., Krämer, M., Moyer, E., Bucci, S., Afchine, A., Borrmann, S., Cairo, F., Clouser, B., D’Amato, F., Legras, B., Lykov, A., Mitev, V., Matthey, R., Rolf, C., Singer, C., Ulanovsky, A., Viciani, S., Volk, M., Yushkov, V., and Stroh, F.: Evolution of tracer and ice crystal distribution in the young plumes of overshooting turrets from the StratoClim golden flight , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9756,, 2021.


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