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, 25th October

With Anne, Didier, Juliette, Nicolas and Marion.

Few results were shown about lmdzorinca run using IPSL oceanic N₂O fluxes. For the preindustrial run with reduced emissions, convergence is not achieved after 10 years. Neither is for the run with all emissions. The equilibrium concentration value seems to be around 337 ppb but the restart starts at 332 ppb (previous value with CNRM fluxes).

Oceanic results cannot be shown due to problems with TimeSeries? but the problem will be solved in few days. At the moment, pi control run has 50 years (1836-1881) and historical simulation is running from 1836 to 1988.

TO DO

• See why restart for lmdzorinca run is not the good one,
• Run timeSeries and monitoring for oceanic runs,
• Incorporate developments in the coupled model.

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.