v1 CMIP6 piControl Low Res

Global averaged net radiation flux at TOA (or more precisely model top). Averaged over the 500 years of piControl, the net flux is -0.01 W/m2.

The pre-industrial control simulation (piControl) is the first and cornerstone simulation of the water cycle v1 campaign with the E3SM v1 low-res model. The low-res model includes atmosphere and land components at ~100 km resolution coupled to ocean and sea-ice components at 60 to 30 km resolutions as well as a river component. As in all E3SM water cycle simulations, CO2 (and other GHGs) concentrations is imposed.

 

After some initial adjustment during the first 100 years, the global average surface temperature is very stable.

PiControl was configured to adhere as closely as possible with the CMIP6 DECK specifications (Eyring at al. 2016, GMD) with prescribed forcings appropriate for 1850 conditions. The simulation was run with time invariant forcings for a total of 500 years. To reduce spin-up time of the deep ocean, the simulation was initialized from a series of pre-existing control simulations performed with developmental versions of E3SM v1 as part of the final tuning phase (approximately 400 years). The final model tuning consisted of minor adjustments to cloud parameters with the objectives of achieving (1) near zero net top-of-atmosphere (TOA) radiation balance and (2) stable global mean surface air temperature. Both objectives were achieved as demonstrated in the figures below.

 

After some initial adjustment during the first 100 years, the global average surface temperature (Fig. 2) is very stable. Over the entire 500 year period, there is a slight positive trend (+0.013 K/century), with a much reduced trend over the last 400 years (-0.0033 K/century).

Diagnostic plots from 500 years simulation with this configuration

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