CMIP7 workflow v0

[jkikstra]

This PR aims to implement a first version [v0] of the ScenarioMIP/CMIP7 emissions harmonization and gridding workflow.

It aims to be taking:

• IAM scenario data from the ScenarioMIP project
• Historical emissions data collected in https://github.com/iiasa/emissions_harmonization_historical

see TODO list in docs/source/index.rst

• check that sector naming is aligned
  • variabledefs-cmip7_*.csv
  • CEDS (emissions_harmonization_historical)
  • GFED (emissions_harmonization_historical)
• write IAM data aggregation and variable processing script
  • without dask?
  • [~] with dask. (note: started work on this, but does not look necessary for this workflow, so to keep things simple I removed it again)
• update variabledefs-cmip7_noCDR.csv
• align units between IAM and CEDS data
• update input data: map from ssp_submission downloaded data to concordia input data
  • start from newly downloaded data
  • run pipeline on a newly submitted MESSAGE ScenarioMIP scenario (without aviation)
  • use multiple IAMs (with appropriate region mappings)
    • add region mapping code, or just the files?
• update harmonization reporting emission files notebook
  • make it for multiple models
  • update historical data input
• test out global-first harmonization: adding test file for top-down harmonization iiasa/aneris#79
• make more progress on common-definitions IPCC2006 labels for machine-readable mapping; maybe ask Will, Robert, Johannes - currently working together with Luca on this...
• update CEDS data (still harmonization in 2020)
• create interpolation methods between 2020 and 2025
  • linear interpolation
  • interpolation based only on historical (relative) trends
  • interpolation based only on historical (absolute) trends
  • 2022 as base_year
• update proxy .nc files, (especially for N2O)
  • new CEDS based data
  • double check N2O; also in varaiabledefs-cmip7_noCDR.csv concordia input file
• use interpolated input files, and move harmonization to 2022
• update gridding files with new CEDS data (from ESGF, or direct download?)
• update to BB4CMIP7 national GFED data (from emissions_harmonization_historical?)
• new SSP data (NB. new data is available, but not final yet, so not updated yet)
  • GDP
  • Population
• is country_combinations still needed when SSP data have been updated?
• create mapping file with regionmapping following ssp_submission scenario explorer mapping style, using common-definitions / nomenclature
• register multiple models
• try new harmonization algorithms
• update variabledefs-cmip7_*.csv to have CDR
• deal properly with units and minor gases
• remove alkalinity option?