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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-5
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-5
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 05 Feb 2019

Development and technical paper | 05 Feb 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

A Lagrangian convective transport scheme including a simulation of the time air parcels spend in updrafts

Ingo Wohltmann1, Ralph Lehmann1, Georg A. Gottwald2, Karsten Peters3,a, Alain Protat4, Valentin Louf5, Christopher Williams6, Wuhu Feng7, and Markus Rex1 Ingo Wohltmann et al.
  • 1Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany
  • 2School of Mathematics and Statistics, University of Sydney, New South Wales, Australia
  • 3Max Planck Institute for Meteorology, Hamburg, Germany
  • 4Bureau of Meteorology, Melbourne, Australia
  • 5Monash University, Clayton, Australia
  • 6NOAA, Boulder, Colorado, USA
  • 7National Centre for Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
  • anow at: Deutsches Klimarechenzentrum GmbH (DKRZ), Hamburg, Germany

Abstract. We present a Lagrangian convective transport scheme developed for Chemistry and Transport Models and ensemble trajectory simulations. Similar to existing schemes in other Lagrangian models, it is based on a statistical approach of calculating parcel displacements by convection. These schemes redistribute air parcels within a fixed time step by calculating probabilities for entrainment and the altitude of detrainment. Our scheme extends this approach by modelling vertical updraft velocities and the time that an air parcel spends inside the convective event, which is important for simulating the tropospheric chemistry of short-lived species, e.g. it determines the time available for heterogeneous processes on the surface of cloud droplets. Two different schemes for determining the vertical updraft velocities are introduced, which are based on constant or random convective area fraction profiles, respectively. SO2 is used as an example to show that there is a significant effect on species mixing ratios when modelling the time spent in convective updrafts compared to a nearly instantaneous redistribution of air parcels. The scheme is driven by convective mass fluxes and detrainment rates that originate from an external convective parameterization, which can be obtained from meteorological analysis data or General Circulation Models. Validation runs driven by ECMWF ERA Interim reanalysis data are performed with the scheme implemented into the ATLAS Chemistry and Transport Model. These include long-term global trajectory simulations of Radon-222 that are compared to measurements, and runs testing mass conservation and the reproduction of the convective mass fluxes and detrainment rates of ERA Interim. Simulated vertical updraft velocities are validated by wind profiler measurements in Darwin.

Ingo Wohltmann et al.
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Ingo Wohltmann et al.
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Short summary
We present a trajectory based model for simulating the transport of air parcels by convection. Our model extends the approach of existing models by explicitly simulating vertical updraft velocities inside the clouds and the time that an air parcel spends inside the convective event.
We present a trajectory based model for simulating the transport of air parcels by convection....
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