1. George B

    George B Extinct but not forgotten Staff Member Staff Member

    Debunk Global Warming can reduce the number of Persistent Contrails and Contrail Induced Cirrus Clouds

     
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  3. George B

    George B Extinct but not forgotten Staff Member Staff Member

    Seems research indicates GW is increasing the temperature in the Troposphere and reducing the temperature in the stratosphere while increasing humidity in both . . . seems this could effect contrail formation and persistence . . .
     
  4. MikeC

    MikeC Senior Member

    Where does it say that it will specifically can not reduce the number of Persistent Contrails? As far as I can see from what you have posted the actual effects on contrails are not specified.
     
  5. George B

    George B Extinct but not forgotten Staff Member Staff Member

    This might help . . . Dr Minnis comments/responses are in red . . .

     
  6. Mick West

    Mick West Administrator Staff Member

    I would have though that more moisture in the upper troposphere would lead to at least larger volumes of ice-supersaturated air, and hence slightly more contrails, not just thicker contrails.

    Still, there are multiple interconnected variables here, with various types of feedback, so it's quite difficult to say what the net effect would be on contrail frequency
     
  7. George B

    George B Extinct but not forgotten Staff Member Staff Member

    I would have thought that as well . . . however, I think the point is because of global warming the warmer temperatures reaching higher into the troposphere reduces or shrinks the optimal air potential to produce supersaturated air for ice more than the increased humidity would increase the potential for supersaturated air . . . so increased temperatures at altitude wins over more humidity . . .
     
  8. Mick West

    Mick West Administrator Staff Member

    That depends on the frequency of flights through various altitudes.
     
  9. George B

    George B Extinct but not forgotten Staff Member Staff Member

    I can't disagree (in fact, I have always said contrail avoidance is very possible) . . . however, I think as a general and broad observation, Dr Minnis was saying . . . because of global warming air traffic will (based on existing filght patterns and in the foreseeable future) as a general rule may (slightly) reduce the potential for persistent contrails, not increase them . . .