EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

TRACMASS 7.0 - A Lagrangian trajectory code for atmosphere and ocean sciences

Aitor Aldama Campino1, Kristofer Döös1, Sara Berglund1, Dipanjan Dey1, Joakim Kjellsson2,3, and Bror Jönsson4
Aitor Aldama Campino et al.
  • 1Stockholm University, Department of Meteorology, Stockholm, Sweden
  • 2GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
  • 3Christian-Albrechts-Universitat zu Kiel, Kiel, Germany
  • 4Plymouth Marine Laboratory, Plymouth, United Kingdom

The latest version of the TRACMASS trajectory code, version 7.0 will be presented. The latest version includes several new features, e.g. water tracing in the atmosphere, generalisation of the tracer handling, and improvements to the numerical scheme. The code has also become more user friendly and easier to get started with. Previous versions of TRACMASS only allowed temperature, salinity and potential density to be calculated along the trajectories, but the new version allows any tracer to be followed e.g. biogeochemical tracers or chemical compounds in the atmosphere. 

TRACMASS calculates Lagrangian trajectories offline for both the ocean and atmosphere by using already stored velocity fields, and optionally tracer fields. The code supports most vertical coordinate systems, e.g. z-star, z-tilde, sigma, and hybrid sigma-pressure coordinates. Hence, TRACMASS supports a range of atmosphere and ocean models such as ECMWF IFS, NEMO, ROMS, MOM, as well as reanalysis products (e.g. ERA-5) or observations (e.g. geostrophic currents from AVISO satellite altimetry). The fact that the numerical scheme in TRACMASS is mass conserving allows us to associate each trajectory with a mass transport and calculate the Lagrangian mass transport between different regions as well as construct Lagrangian stream functions. 

A short course on how to set up, configure and run the TRACMASS code will be given separately, SC5.17.

How to cite: Aldama Campino, A., Döös, K., Berglund, S., Dey, D., Kjellsson, J., and Jönsson, B.: TRACMASS 7.0 - A Lagrangian trajectory code for atmosphere and ocean sciences, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1690,, 2021.


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