The Chemical Lagrangian Model of the Stratosphere (CLaMS)

CLaMS (Chemical Lagrangian Model of the Stratosphere) is a modular chemistry transport model (CTM) system developed at Research Centre Jülich, Germany. CLaMS was first described by McKenna et al (2000a,b) and was expanded into three dimensions by Konopka et al (2004). CLaMS has been employed in recent European field campaigns THESEO, EUPLEX, TROCCINOX and SCOUT-O3 with a focus on simulating ozone depletion and water vapour transport.

Major strengths of CLaMS in comparison to other CTMs are

• its applicability for reverse domain filling studies
• its anisotropic mixing scheme
• its integrability with arbitrary observational data
• its comprehensive chemistry scheme

CLaMS Documentation

The details of the model CLaMS are well documented and published in the scientific literature.

• Formulation of advection and mixing by McKenna et al, 2002a

• Formulation of chemistry-scheme and initialisation by McKenna et al, 2002b

• Comparison of the chemistry module with other stratospheric models by Krämer et al, 2003

• Calculation of photolysis rates by Becker et al, 2000

• Extension to 3-dimension model version by Konopka et al, 2004

• Lagrangian sedimentation by Grooß et al, 2005

The Main CLaMS Modules

1. Trajectory module

2. Chemistry module

3. Lagrangian mixing module

4. Lagrangian sedimentation scheme

More CLaMS Modules

• isentropic

• pos

• tdot

• dynmod

• i3d

• rad

• init

• clams-tools

• netcdf-tools

• packing

• conv2ncdf

Used Libraries

• NetCDF

• Utils-Library

• Installation

HowToParallel

CLaMS on JUROPA

CLaMS data sets

A chemical transport model does not simulate the dynamics of the atmosphere. For CLaMS, the following meteorological data sets have been used

• European Centre for Medium-Range Weather Forecasts (ECMWF), Predictions, Analyses, ERA-15, ERA40

• United Kingdom Meteorological Office (UKMO)

• European Centre Hamburg Atmospheric Model (ECHAM4), in the DLR version

To initialize the chemical fields in CLaMS, a large variety of instruments have provided data

• on satellite (CRISTA, MIPAS, MLS, HALOE, ILAS, MOPITT, ...),

• on aircraft and balloons (HALOX, FISH, Mark IV, BONBON, ...)

• emission inventories (RETRO, EDGAR, GFED, ICE, ...)

If no observations are present, the chemical fields can be initialised from two-dimensional chemical models, chemistry-climate models, climatologies, or from correlations between chemical species or chemical species and dynamical variables.

Example animations

Example animations from a CLaMS simulation of the 2004/05 winter are shown on the page ExampleAnimations.

Additional Tools

Flightplanner

Based on former work concerning a tool to be used for the planning of flights during field campaigns, a new Java-based tool was developed by MarkusEffer.