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

Submitted as: research article 03 Jan 2020

Submitted as: research article | 03 Jan 2020

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A revised version of this preprint is currently under review for the journal ACP.

Deep convective influence on the UTLS composition in the Asian Monsoon Anticyclone region: 2017 StratoClim campaign results

Silvia Bucci1, Bernard Legras1, Pasquale Sellitto2, Francesco D'Amato3, Silvia Viciani3, Alessio Montori3, Antonio Chiarugi4,a, Fabrizio Ravegnani5, Alexey Ulanovsky6, Francesco Cairo5, and Fred Stroh7 Silvia Bucci et al.
  • 1Laboratoire de Météorologie Dynamique (LMD), UMR 8539, CNRS, École Normale Supérieure, PSL Research University, École Polytechnique, Sorbonne Université, École des Ponts ParisTech, Institut Pierre Simon Laplace, Paris, France
  • 2Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR 7583, CNRS, Universitè Paris-Est-Créteil, Université de Paris, Institut Pierre-Simon Laplace, Créteil, France
  • 3National Institute of Optics (CNR-INO), Firenze and Sesto Fiorentino, Italy
  • 4National Institute of Geophysics and Vulcanology (INGV), Pisa, Italy
  • 5Institute for Atmospheric Sciences and Climate of the National Research Council, (ISAC-CNR), Bologna and Rome, Italy
  • 6Central Aerological Observatory (CAO), Moskow, Russia
  • 7Institute of Energy and Climate Research, Stratosphere, Forschungszentrum Jülich, Jülich, Germany
  • apresent address: SENSIT Technologies, Valparaiso,Indiana, USA

Abstract. The StratoClim stratospheric aircraft campaign took place in summer 2017 in Nepal (the 27th of July–10th of August) and provided a wide dataset of observations of air composition inside the Asian Monsoon Anticyclone. In the framework of this project, with the purpose of modelling the injection of pollutants and natural compounds into the stratosphere, we performed a series of diffusive back-trajectories runs along the flights' tracks. The availability of in-situ measurements of trace gases has been exploited to evaluate the capability of the trajectory system to reproduce the transport in the Upper Troposphere–Lower Stratosphere (UTLS) region. The diagnostics of the convective sources and mixing in the air parcel samples have been derived by integrating the trajectories output with high-resolution observations of cloud tops from the Meteosat Second Generation (MSG1) and Himawari geostationary satellites. Back-trajectories have been calculated using meteorological fields from European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis (ERA-Interim and ERA-5) at 3 h and 1 h resolution, using both kinematic and diabatic vertical motion. The comparison among the different trajectory runs shows, in general, a higher consistency with observed data, as well as a better agreement between the diabatic and kinematic version, when using ERA-5 based runs with respect to ERA-Interim. Overall, a better capacity in reproducing the pollution features is finally found in the diabatic version of the ERA-5 runs. Adopting this setting for the analysis, a large variety of transport conditions have been individuated during the 8 flights of the campaign. The larger influence by convective injections is found from the continental sources of China and India. Only a small contribution appears to be originated from maritime regions, in particular the South Pacific and the Bay of Bengal that, unexpectedly, was not particularly active during the period of the campaign. Thin filamentary structures of polluted air, characterized by peaks in CO, are observed, mostly associated with young convective air (age less than a few days) and a predominant South-China origin. Observed air from continental India, on the contrary, is often linked to a lower concentration of the trace gas and to air masses that recirculated within the anticyclone for 10 to 20 days. Vertical stratification in the age of air is observed: up to 15 km, the age is less than 3 days and these fresh air masses constitute almost the totality of the air composition. A transition layer is then individuated between 15 km and 17 km, where the convective contribution is still dominant and the ages vary between one and two weeks. Above this level, the mean age of the air sampled by the aircraft is estimated to be 20 days. There, the convective contribution rapidly decreases with height, and finally became negligible around 20 km.

Silvia Bucci et al.

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Silvia Bucci et al.

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Publications Copernicus
Short summary
The paper presents and evaluates a transport analysis method to study the convective injection of air in the upper troposphere–lower stratosphere of the Asian monsoon anticyclone region. The approach is thereby used to analyse the trace gas data collected during the StratoClim aircraft campaign. The results showed that fresh convective air can be fastly injected at a high level of the atmosphere (above 17 km) with potential impacts on the stratospheric chemistry of the northern hemisphere.
The paper presents and evaluates a transport analysis method to study the convective injection...