EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Results from a comparison of HCN measurements and Lagrangian backtrajectory analyses in the Asian Summer Monsoon Anticyclone

Yun Li1, Bärbel Vogel1, Felix Plöger1, Silvia Bucci2, Bernard Legras2, Silvia Viciani3, Francesco D'Amato3, and Fred Stroh1
Yun Li et al.
  • 1Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-7), Jülich, Germany (
  • 2Laboratoire de Météorologie Dynamique, IPSL, CNRS/UPMC/ENS, France
  • 3Consiglio Nazionale delle Ricerche - Istituto Nazionale di Ottica (CNR-INO), Italy

The StratoClim aircraft field campaign took place from Kathmandu, Nepal, in summer 2017 in
order to study the atmospheric composition, chemistry, and dynamics in the Asian Summer
Monsoon Anticyclone (ASMA) which is known to transport surface emissions to the mid-latitude
lower stratosphere and the stratosphere worldwide. Hydrogen cyanide (HCN) which is primarily
emitted from biomass burning and has a UTLS lifetime on the order of 1-2 years is a good tracer for
biomass burning import into the lower and free stratosphere.
HCN in the ASM Upper Troposphere and Lower Stratosphere (UTLS) was measured in-situ
employing the Chemical-Ionization Time-of-Flight Mass Spectrometer FUNMASS on board the
high-altitude research aircraft M55-Geophysica. The observed HCN mixing ratios in and above the
ASMA exhibit interesting vertical and horizontal signatures around the tropopause as well as in the
LS probably resulting from convective activity or air mass origin (AMO). We here compare
measured HCN to Lagrangian simulations by the ClaMS and TRACZILLA models which employ
two different approaches to represent higher-reaching convective events. The simulations succeed to
track some of the observed HCN features back to convective activity or AMO. The quality of the
reproduction and further outcomes on the atmospheric relevance will be discussed in the

How to cite: Li, Y., Vogel, B., Plöger, F., Bucci, S., Legras, B., Viciani, S., D'Amato, F., and Stroh, F.: Results from a comparison of HCN measurements and Lagrangian backtrajectory analyses in the Asian Summer Monsoon Anticyclone, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-19263,, 2020

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