“The injection of H2SO4 vapor into an aircraft wake was proposed by Pierce et al. (2010) to avoid inefficiently

large particles produced by SO2 injection. Pierce et al. used a plume model to account for the rapid nucleation

and coagulation of aerosol particles in an expanding aircraft plume, finding that this method could keep the

global aerosol size distribution closer to optimal, reducing the flux of sulfur required for a given RF and pro-

ducing a more linear response of RF to injection flux.”