Dear CF community, to more specifically describe sea-ice output from climate-model simulations for the CMIP6 Sea-Ice MIP (SIMIP), we would like to propose the following new standard names, area types and regions. To ease discussion, we will suggest variables that are likely to require some discussion in follow-up emails.
New standard names: 1. proportion_of_model_time_steps_with_sea_ice_fraction_above_threshold fraction of time steps which had sea ice during the averaging period of typically one month. It allows one to differentiate half a month of 100% sea-ice cover from a full month of 50 % sea-ice concentration. 2. sea_ice_mass_content [kg m-2] describes the total mass of sea ice divided by grid-cell area. 3. sea_ice_basal_temperature [K] the temperature at the interface, NOT the temperature within the lowermost sea-ice model grid cell 4. sea_ice_salt_content [kg m-2] the total mass of all salt in sea ice divided by grid cell area 5. sea_ice_melt_pond_thickness [m] the volume of water in meltponds divided by meltpond covered area 6. thickness_of_sea_ice_melt_pond_refrozen_ice [m] the volume of refrozen ice in meltponds divided by meltpond covered area 7. ridged_sea_ice_thickness [m] total volume of ridged sea ice divided by area of ridges 8. tendency_of_sea_ice_amount_due_to_thermodynamics [kg m-2 s-1] total change in sea-ice mass from thermodynamic processes divided by grid-cell area 9. tendency_of_sea_ice_amount_due_to_dynamics [kg m-2 s-1] total change in sea-ice mass from dynamic processes divided by grid-cell area 10. tendency_of_sea_ice_amount_due_to_lateral_melting [kg m-2 s-1] total change in sea-ice mass from lateral melting divided by grid-cell area 11. surface_snow_sublimation_flux [kg m-2 s-1] the rate of change of snow mass through sublimation and evaporation divided by grid-cell area 12. tendency_of_surface_snow_amount_due_to_sea_ice_dynamics [kg m-2 s-1] the rate of change of snow mass through advection with sea ice divided by grid-cell area 13. tendency_of_surface_snow_amount_due_to_ice_conversion [kg m-2 s-1] the rate of change of snow mass due to transformation of snow to sea ice divided by grid-cell area 14. tendency_of_surface_snow_amount_due_to_drifting [kg m-2 s-1] the rate of change of snow mass through wind drift of snow divided by grid-cell area 15. sea_ice_basal_downwelling_shortwave_flux_in_sea_water [W m-2] the downwelling shortwave flux underneath sea ice (always positive) 16. sea_ice_basal_net_downward_sensible_heat_flux [W m-2] the net sensible heat flux under sea ice from the ocean 17. sea_ice_surface_net_downward_conductive_heat_flux [W m-2] the net heat conduction flux at the ice surface 18. sea_ice_basal_net_downward_conductive_heat_flux [W m-2] the net heat conduction flux at the ice base 19. salt_flux_into_sea_water_from_sea_ice [kg m-2 s-1] Total flux of salt from water into sea ice divided by grid-cell area; salt flux is upward (negative) during ice growth when salt is embedded into the ice and downward (positive) during melt when salt from sea ice is again released to the ocean 20. water_flux_into_sea_water_from_sea_ice [kg m-2 s-1] Total flux of fresh water from water into sea ice divided by grid-cell area; This flux is negative during ice growth (liquid water mass decreases, hence upward flux of freshwater), positive during ice melt (liquid water mass increases, hence downward flux of freshwater) 21. surface_drag_coefficient_for_momentum_in_sea_water [1] Oceanic drag coefficient that is used to calculate the oceanic momentum drag on sea ice 22. sea_ice_specific_x_force_due_to_sea_surface_tilt [N m-2] X-component of force on sea ice caused by sea-surface tilt 23. sea_ice_specific_y_force_due_to_sea_surface_tilt [N m-2] Y-component of force on sea ice caused by sea-surface tilt 24. sea_ice_specific_x_force_due_to_coriolis_term [N m-2] X-component of force on sea ice caused by coriolis force 25. sea_ice_spcecific_y_force_due_to_coriolis_term [N m-2] Y-component of force on sea ice caused by coriolis force 26. sea_ice_specific_x_force_due_to_internal_forces [N m-2] X-component of force on sea ice caused by internal stress (divergence of sigma) 27. sea_ice_specific_y_force_due_to_internal_forces [N m-2] Y-component of force on sea ice caused by internal stress (divergence of sigma) 28. sea_ice_mass_transport_across_line [kg s-1] "net (sum of transport in all directions) sea ice mass transport through given passages, positive into the Arctic Ocean 29. sea_ice_area_transport_across_line [kg s-1] "net (sum of transport in all directions) sea ice area transport through given passages, positive into the Arctic Ocean New standard regions: 31. Northern Hemisphere 32. Southern Hemisphere New area types 33. snow_covered_sea_ice 34. ridged_sea_ice Thank you very much for your feedback, guidance and input. With best wishes, for the SIMIP Steering Committee, Dirk Notz -- ---- Dr. Dirk Notz http://www.mpimet.mpg.de/~notz.dirk _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
