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What's
new about version 7.03?
Version 7.03 includes a revision to
the convergence criteria in the gas
phase chemistry that avoids
overestimation of NOx and/or ozone
during extremely stagnant
meteorological conditions. Our testing
indicates that on days that had run
without problems, the changes are
small, about 5% or so, with the
largest changes in gas phase species
such as NO, NO2, and ozone. Some
smaller changes appear in species that
are influenced by the gas phase
chemistry, such as SO4 and PNO3.
Species that should not be affected by
gas phase chemistry (e.g., PEC)
remained unchanged in our tests. The
cpu time in our tests was increased by
less than 10%.
For those of you who
are interested in the new code, here
is the change made to subroutine
step4_fst.f:
if (hold(l).gt.1.0e-9)
then
err=abs(rate(l)/hold(l))
else
err=abs(rate(l))
endif
hold(l)=tmphh
+ rate(l)
if (err.gt.tmpmax)
then
tmpmax=err
endif
c if (hold(l).le.
0.0) hold(l)=tmphh/10.
! comment out this line
if (hold(l).le.
-bdnl(l)) tmpmax = 10.*rerror
! add this line
160
continue
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