Removing all CO2 would result in a radiative forcing of -22 W / m2, TOA — I don't know the tropopause
level with
stratospheric adjustment
value; assuming it is similar to in proportion to the TOA forcing as for doubling CO2, removing all CO2 might have a tropopause
level with
stratospheric adjustment forcing somewhere roughly around -30 W / m2, though that proportionality may break down as we get to a point where CO2 is not saturated... But using 22/3.7 and 30/3.7, it appears for a rough estimate that the logarithmic proportionality for CO2 may break down before about 6 to 8 halvings of CO2.
If this happens during northern winter, surface pressure falls in the Arctic (rising AO) the night jet stalls, NOx injection falls away,
stratospheric ozone
levels increase, the coupled circulation is invigorated and pressure falls at 50 - 60 ° north and this is associated with cloud loss (when global cloud cover is at its maximum
value) and a strong rise in global sea surface temperature.