Status of v1 BGC Campaign

Each model version is used in a simulation campaign consisting of major simulations to address the questions of science drivers in the water cycle, biogeochemistry, and the cryosphere system.

E3SM v1 biogeochemistry experiment: Planned simulations.

Undergoing Simulations - BGC Campaign, E3SM v1.1

The biogeochemical (BGC) simulations use the lower/standard resolution configuration (100 km atmosphere/land, 30-60-~45 km equator-midlatitudes-poles ocean/sea-ice). The campaign will exercise two different land soil BGC approaches, the Convergent Tropic Cascade (CTC) and the Equilibrium Chemistry Approximation (ECA) configurations, and the simulation campaign will characterize the impacts of the structural uncertainties associated with these different approaches on the model’s coupled carbon-climate feedbacks.

Starting from a spun-up physical state, the representations of biogeochemical processes in land and ocean have been turned on, and the coupled model has been spun up to produce consistent initial conditions for the physical state and nutrient pools.

Additional simulations are planned to characterize the effect of turning off phosphorus limitation (CTC-CN), and to exercise the model in an emission-forced prognostic CO2 mode (EF).

Spin up runs

1132 years of spin-up for three different model configurations are already complete.

  • The first configuration, E3SMv1.1-BGC, uses the Converging Trophic Cascade (CTC) approach to soil biogeochemistry and includes nitrogen and phosphorous limits on the carbon cycle (CNP); additionally, this configuration includes active biogeochemistry in the ocean and ice models. For this configuration, 679 years of spin-up were completed.
  • The second configuration, E3SMv1.1-BGC-CN, also uses CTC, but excludes phosphorous limits. Fifty-six years of spin-up have been completed for this configuration.
  • The final configuration, E3SMv1.1-BGC-ECA, uses an alternative approach to soil biogeochemistry – the Equilibrium Chemistry Approximation (ECA). For this configuration, 397 years of spin up are complete.

Production runs

Five different production simulations that use CTC and CNP are currently under way, they are (as of the end of January 2019):

  • Pre-industrial control – 69 of 250 years have been completed
  • Historical simulation (1850-2014) with constant CO2concentrations seen by atmosphere, land, ocean, and ice. Simulation includes transient land use, non-CO2, and nitrogen deposition as specified by CMIP6 – 56 of 250 years have been completed
  • Historical simulation (1850-2014) with transient CO2concentrations seen by atmosphere, and constant CO2concentrations seen by land, ocean, and ice. Simulation includes transient land use, non-CO2, and nitrogen deposition as specified by CMIP6 – 62 of 250 years have been completed
  • Historical simulation (1850-2014) with constant CO2concentrations seen by atmosphere, and transient CO2concentrations seen by land, ocean, and ice. Simulation includes transient land use, non-CO2, and nitrogen deposition as specified by CMIP6 – 56 of 250 years have been completed
  • Historical simulation (1850-2014) with transient CO2concentrations, land use, non-CO2, and nitrogen deposition as specified by CMIP6 – 67 of 250 years have been completed.

 

Send this to a friend