Aerosol situation above 2 km as defined in Shettle (1989).
   aerosol_vulcan value
where value is an integer choosing between the following models
1
Background aerosols.
2
Moderate vulcanic aerosols.
3
High vulcanic aerosols.
4
Extreme vulcanic aerosols.





Arve Kylling 2010-03-10