Scale down isoprene emissions by 30%.
Since emissions are a product of several factors, modify the
   annual emission factor for isoprene.

Signed-off-by: Sungshik Kim <kim68@fas.harvard.edu>
Add tropopause height to the timeseries diagnostic
Kludge for Katie, added as N = 125

Signed-off-by: Sungshik Kim <kim68@fas.harvard.edu>