The attachment gives abstracts of three papers that show the complexity of
the mechanisms that result in stratospheric water vapor content, and also
the several chemical complexities of stratospheric aerosol chemistry.
Models are some way off being able to represent them quantitatively.
On 26
http://adsabs.harvard.edu/abs/2014EGUGA..1613888W
Cross-scale modelling of the climate-change mitigation potential of biochar
systems: Global implications of nano-scale processes
Woolf,Dominic; Lehmann,Johannes
EGU General Assembly 2014, held 27 April - 2 May, 2014 in Vienna, Austria,