ESM2025-N-cycle

This page is dedicated to the ESM2025 project (Earth System Models - European Project), especially for the N-cycle modelling. On this topic are working Marion Gehlen, Juliette Lathière, Didier Hauglustaine, Nicolas Vuichard and Karine Laurent, with the help of Anne Cozic.

You will find information on the evolution of the project on these different pages:

• Meetings: report of meetings every week;
• Intermediate Conclusions: some partial conclusions;
• Notebooks list: description of working documents;
• References: some interesting references.

Last meeting

On Friday 19th July

With Didier, Nicolas, Anne, Thibaut and Marion.

Show different results for preindustrial runs with different initial concentration (315/325/320ppb whole atmosphere). Always big jump at the beginning.

Run pisces ok, many years already computed: meeting next monday with the two Marion.

TO DO

• Remake of ratio atm/surf (not the first year)
• Find equilibrium state with lifetime of 130 years and ratio atm/surf=0.967

Last intermediate conclusions

Comparison with Prather's article

Reduction parameter of 1.3 on reaction rates to be in accordance with present day lifetime (observation). A previous value was 1.1 but it was only support on reaction rate and not on photolysis rate too.

Last notebooks/working documents

16. compare_ant_emissions.ipynb: Different methods are used to reconstruct nc files for N₂O emissions. This notebook served to visualisation of global emissions.
17. check_coeff_reconstruction_proxy.ipynb: with different method of reconstruction, result are different, this notebook explore coefficient used to reduce emissions for pre industrial period and after (coeff only per region and coeff per region and sector).
18. black_box_emissions_model.ipynb: little box model to compute concentration with given emissions and inverted model.

+ on Irene:

• on workdir: scripts_nco/prepare_N2OLOSS.job: will compute N2O total loss, N₂O photolyse loss, N₂O o1d loss and N₂O burden. This file creates some nc file on scratch directory (in Loss_files) and some txt file in place.
• on workdir: scripts_ferret: some scripts to draw more or less beautiful pictures.
• path to simulation directory (on work-gen2201-cont003):
  • with Orchidee_Quest: ESM2025/modipsl/config/LMDZORINCA_v6
  • with Orchidee_3: ESM2025/modipsl_v6.3/config/LMDZORINCA_v6
  • with Maureen's Code: extract_Maureen/modipsl/config/LMDZORINCA_v6

+ on Ciclad/Spirit?:

• INCAFLXANT_1970_1999.sh: bash script to create sflx_lmdz_ANT for irene (source code in ANT/McDuffie). The creation is made on datadir.

+ on Obelix:

• CEDS_transform/nco_transform_1970_1999_ncfiles.sh and nco_transform_country_1970_1999_ncfiles.sh: final step on nc files while transforming excel data into nc files.
• Interpol_With_rmp.ipynb: Notebook of O. Marti that transform eORCA1 grid into regular one (144x142 here).
• Ciclad_N2O_values.ipynb: Notebook to quickly see evolution of BBG and ANT emissions, needs a grep command on Ciclad and file transfer to Obelix.
• Transform_into_ncfile_preindustrial.sh: script corresponding to the notebook Transform_country_csv_to_nc_1970_2019.ipynb for preindustrial period.