Abstract

We present MISTRA-v9.0, a one dimensional (1D) atmospheric chemistry model. The model includes a detailed particle description with regards to the microphysics, gas-particle interactions, and liquid phase chemistry within particles. Version 9.0 is the first release of MISTRA as an open-source community model. A major review of the code has been performed along with this public version release to improve the user-friendliness and platform-independence of the model. In the past 20 years, MISTRA has been used in over 25 studies to address a wide range of scientific questions. The purpose of this public release is to maximise the benefit of MISTRA to the community by making the model freely available and easier to use and develop. This paper presents a thorough description of the model characteristics and components. We show some examples of simulations reproducing previous studies with MISTRA, finding that version 9.0 is consistent with previous versions.

Highlights

  • We present MISTRA-v9.0, a one dimensional (1D) atmospheric chemistry model

  • We present a selection of a few specific model settings reproducing previous work, to compare the original results with those obtained with MISTRA-v9.0

  • It is released under the European Union Public Licence (EUPL) v1.1, which permits free commercial and private use and unrestricted distribution, but requires that future developments of MISTRA are shared under the same licence

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Summary

Introduction

Atmospheric aerosols are a major component of the Earth climate system. They significantly affect the radiative balance of the atmosphere, through direct (scattering and absorption) and indirect effects (cloud properties modification) (Carslaw et al, 2010; Boucher et al, 2014). Balloon or flight surveys provided valuable data for this purpose, but the number of investigated parameters is necessarily limited, with many uncertainties and unknown values Another useful tool for atmospheric chemistry and physic understanding is the atmospheric simulation chambers (see for instance https://www.eurochamp.org, last accessed 01-July-2021). We present the 1D atmospheric chemistry model MISTRA-v9.0, including size-resolved aerosol processes as well as particle-chemistry interaction. The unique feature of this model is the use of a two-dimensional particle distribution, with one dimension accounting for dry particle radius, and 45 the second dimension for the total particle radius Based on this first version of MISTRA, Bott (1997) further included typical particle distributions of urban and rural aerosols for the study of MBLs influenced by continental air masses. We present a selection of a few specific model settings reproducing previous work, to compare the original results with those obtained with MISTRA-v9.0

Recent developments and public release
Overview of the model components
Meteorology, microphysics and thermodynamics
Chemistry
Gas phase and uptake
Aqueous phase
Hysteresis of particle activation
Accounting for the chemical activity
Photolysis
Emission and deposition
Initialisation and run settings
Get the code
System requirements and installation
Prepare the chemical mechanism files
Set a namelist and initial chemical species concentration
Set a param file and run
Consistency with previous versions
Comparison with 1996 version
Findings
Conclusions
Full Text
Published version (Free)

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