Extinct but not forgotten Staff Member
Simply stated the higher the injection the longer the aerosol is assumed to remain in the stratosphere (particulate size and background concentrations interact in a very complex process) from several weeks to two to three years . . . the question is what was or is the objective . . . to have the aerosols remain . . . weeks, months, or years . . . I think I would design to require some of all . . . with most short term . . . this gives one the quickest response to changing natural conditions and to a possible unexpected crisis . . .George.. Question. When the proponents of this sort of SRM mean the stratosphere, are they really thinking of the sorts of altitudes normally associated with the stratosphere or will any height do provided it is in the stratosphere of the day? What I am saying is, how effective would spraying be from lower altitudes? Serious question to you.
I am still trying to dig up 747 performance data. Getting to 45,000 feet in a 747 requires a seriously light aircraft. It was never a possibility with any sort of load. I will check with some friends of mine still flying it.