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Experiment Summary: Emission-Driven Experiments (EH & ES)

The Emission-Driven experiments evaluate Earth System feedbacks by driving ACCESS-ESM1.6 directly with anthropogenic surface and aircraft carbon dioxide emissions fluxes rather than prescribed atmospheric concentrations.

Physical Forcing Rationale & Setup

  • Interactive Carbon Cycle: Atmospheric CO2 concentrations are prognostic, rising and falling based on the balance between prescribed human emissions and simulated natural carbon uptake by land (CABLE/CASA-CNP) and ocean (WOMBAT).
  • Target STASH Item: m01s00i251 (SURFACE CO2 EMISSIONS FLUX).
  • Emissions Components Combined: Total gridded surface emissions from energy, industrial, residential, transport, and agricultural sectors plus vertically integrated aircraft emissions.
  • Timeline Coverage:
    • EH: 1849 to 2023 (including 1849 spin-up padding).
    • ES: 2022 to 2100 (standard) or 2022 to 2150 (extended).

Workflow Switches & Selectors

The execution and extension of interactive CO2 emissions flux tasks are controlled by parameters in rose-suite.conf:

  • Master Forcing Toggle: ANCIL_CREATE_CO2 = true
    Must evaluate to true to schedule any carbon-cycle emissions flux tasks.
  • Experiment Activation Switches:
  • USE_EXP['EH'] = True schedules historical emissions interpolation (EH_ancil_co2).
  • USE_EXP['ES'] = True schedules ScenarioMIP emissions interpolation across active scenarios.
  • Scenario Pathway Selectors (USE_SCEN):
    Active future pathways are governed by USE_SCEN['h'], USE_SCEN['hl'], USE_SCEN['m'], and USE_SCEN['vl'].
  • 2150 Extension Controls (EXTEND_SM_CO2):
    Controls whether future emissions pass --ext to concatenate 2150 extension datasets:
    • 'h': True (Produces ${ESM_ES_EXT_CO2_SAVE_FILENAME['h']} / CO2_fluxes_h_2022_2150_cmip7.anc)
    • 'hl': False (Produces ${ESM_ES_CO2_SAVE_FILENAME['hl']} / CO2_fluxes_hl_2022_2100_cmip7.anc)
    • 'm': False (Produces ${ESM_ES_CO2_SAVE_FILENAME['m']} / CO2_fluxes_m_2022_2100_cmip7.anc)
    • 'vl': True (Produces ${ESM_ES_EXT_CO2_SAVE_FILENAME['vl']} / CO2_fluxes_vl_2022_2150_cmip7.anc)
  • Reference: See Suite Configuration & Parameters Reference for full object declarations.

Complete Task Roster for Emission-Driven Experiments

The following 5 Cylc workflow tasks produce the required CO2 flux ancillary files:

Task Name Experiment Script Entrypoint Primary Input Datasets Output Ancillary Filename Technical Specification
EH_ancil_co2 Emission Historical (EH) co2.cmip7_EH_CO2_interpolate CEDS-CMIP-2025-04-18 (Surface + Air) ${ESM_EH_CO2_SAVE_FILENAME} (CO2_fluxes_1849_2023_cmip7.anc) View Card
ES_h_ancil_co2 Emission ScenarioMIP High (ES-h) co2.cmip7_ES_CO2_interpolate IIASA-IAMC-h-1-1-1 & h-ext-1-1-1 ${ESM_ES_EXT_CO2_SAVE_FILENAME['h']} (CO2_fluxes_h_2022_2150_cmip7.anc) View Card
ES_hl_ancil_co2 Emission ScenarioMIP High-Low (ES-hl) co2.cmip7_ES_CO2_interpolate IIASA-IAMC-hl-1-1-1 ${ESM_ES_CO2_SAVE_FILENAME['hl']} (CO2_fluxes_hl_2022_2100_cmip7.anc) View Card
ES_m_ancil_co2 Emission ScenarioMIP Medium (ES-m) co2.cmip7_ES_CO2_interpolate IIASA-IAMC-m-1-1-1 ${ESM_ES_CO2_SAVE_FILENAME['m']} (CO2_fluxes_m_2022_2100_cmip7.anc) View Card
ES_vl_ancil_co2 Emission ScenarioMIP Very Low (ES-vl) co2.cmip7_ES_CO2_interpolate IIASA-IAMC-vl-1-1-1 & vl-ext-1-1-1 ${ESM_ES_EXT_CO2_SAVE_FILENAME['vl']} (CO2_fluxes_vl_2022_2150_cmip7.anc) View Card

Downstream Configuration Integration

Artifacts feed into the carbon-cycle configuration branches in access-esm1.6-configs:

  • Historical Emissions Branch (esm-historical):
    Files installed to /g/data/${PROJECT}/${USER}/CMIP7/esm1p6_ancil/<DATE>/modern/historical-emissions/atmosphere/forcing/global.N96/<DATE>/CO2_fluxes_1849_2023_cmip7.anc.
  • ScenarioMIP Emissions Branches (esm-scen7-<SCEN>):
    Files installed to /g/data/${PROJECT}/${USER}/CMIP7/esm1p6_ancil/<DATE>/modern/esm-scen7-<SCEN>/atmosphere/forcing/global.N96/<DATE>/CO2_fluxes_<SCEN>_2022_2150_cmip7.anc.