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In general Isoprene emissions are reduced with bug fix.

Advection error in SE

Spurious vertical transport was found over steep topography.  The issue is described in this github issue. 

The correction for current development tags is provided in CAM github issue #633. 

For CESM2.2.0 source code the correction is, in src/dynamics/se/dycore/prim_advance_mod.F90 (at l.578), replace:

                 elem(ie)%derived%dpdiss_ave(i,j,k)=elem(ie)%derived%dpdiss_ave(i,j,k)+&
                      rhypervis_subcycle*eta_ave_w*elem(ie)%state%dp3d(i,j,k,nt)

with:

                 elem(ie)%derived%dpdiss_ave(i,j,k)=elem(ie)%derived%dpdiss_ave(i,j,k)+&  
                      rhypervis_subcycle*eta_ave_w*(elem(ie)%state%dp3d(i,j,k,nt)-dp3d_ref(i,j,k,ie))