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Here are the different model experiments:
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In this set of experiments, I modified the value of certain ocean coefficients globally (e.g. horizontal eddy viscosity, bottom drag coefficient) and compared the results of these sensitivity experiments to a control run. The control run starts from the year 2014 of the CMIP6 EC-Earth3-Veg r1 historical member, uses a 2000-year constant atmospheric forcing and is 200 years long. The sensitivity experiments all start from the year 2130 of the control run (year 117 if we consider the starting year to be 1) and are 50 years long.
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Here are the different model experiments with the corresponding color in the plots below:
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- **t613 (red solid curve, run by K. Wyser)** is the CMIP6 EC-Earth3-Veg r1 historical member covering 1850-2014 (only the period 1950-2014 is shown here);
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- **D000 (blue solid curve)** is the **control** run starting from year 2014 of the t613 experiment with 2000-year constant atmospheric forcing; at the time of writing, this control run is 200 years long; all other experiments start somewhere in the middle of this control run;
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- **D002 (green dashed curve)** starts in year 2130 of the D000 experiment (year 117 of D000) and is 50 years long at the time of writing; the only change compared to D000 is the **horizontal eddy viscosity**, which is **5 times lower**;
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- **D003 (red dashed curve)** is similar to D002, except that the **horizontal eddy viscosity** is **50 times lower** than D000; it is 50 years long at the time of writing;
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- **D004 (gray dashed curve)** starts in year 2130 of the D000 experiment and is 50 years long at the time of writing; the only change compared to D000 is the **bottom drag coefficient**, which is **2 times higher**;
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- **D005 (orange dashed curve)** is similar to D004, except that the **bottom drag coefficient** is **20 times higher** than D000; it is 50 years long at the time of writing;
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- **D007 (magenta dashed curve)** starts in year 2130 of the D000 experiment and is 10 years long; the only change compared to D000 is the **vertical eddy diffusivity**, which is **2 times higher**;
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- **D008 (cyan dashed curve)** starts in year 2130 of the D000 experiment and is 50 years long at the time of writing; the only change compared to D000 is the **horizontal eddy diffusivity**, which is **2 times higher**;
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- **D009 (brown dashed curve)** starts in year 2130 of the D000 experiment and is 50 years long at the time of writing; the only change compared to D000 is the **surface minimum value of turbulent kinetic energy (TKE)**, which is **2 times higher**;
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- **D010 (yellow dashed curve)** starts in year 2130 of the D000 experiment and is 50 years long at the time of writing; this experiment **combines** the changes of experiments D004 (bottom drag x 2), D008 (horizontal diffusivity x 2) and D009 (min. value of TKE x 2).
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- **D000 (blue solid curve)** is the **control** run starting from year 2014 of the t613 experiment with 2000-year constant atmospheric forcing; this control run is 200 years long; all the sensitivity experiments start in year 2130 of this control run (year 117 if we consider the starting year to be 1) and are 50 years long;
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- **D002 (green dashed curve)** starts in year 2130 of the control run (D000); the only change compared to the control run is the **horizontal eddy viscosity**, which is **5 times lower**;
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- **D003 (red dashed curve)** is similar to D002, except that the **horizontal eddy viscosity** is **50 times lower** than the control run;
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- **D004 (gray dashed curve)** starts in year 2130 of the control run; the only change compared to the control run is the **bottom drag coefficient**, which is **2 times higher**;
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- **D005 (orange dashed curve)** is similar to D004, except that the **bottom drag coefficient** is **20 times higher** than the control run;
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- **D007 (magenta dashed curve)** starts in year 2130 of the control run and is only 10 years long; the only change compared to the control run is the **vertical eddy diffusivity**, which is **2 times higher**;
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- **D008 (cyan dashed curve)** starts in year 2130 of the control run; the only change compared to the control run is the **horizontal eddy diffusivity**, which is **2 times higher**;
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- **D009 (brown dashed curve)** starts in year 2130 of the control run; the only change compared to the control run is the **surface minimum value of turbulent kinetic energy (TKE)**, which is **2 times higher**;
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- **D010 (yellow dashed curve)** starts in year 2130 of the control run; this experiment **combines** the changes of experiments D004 (bottom drag x 2), D008 (horizontal diffusivity x 2) and D009 (min. value of TKE x 2).
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I also plot **observations and reanalysis as solid black curves** in my sea-ice plots, in order to compare the model outputs to the 'real world'.
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