Wang, S. W., H.
Levy II, G. Li, H. Rabitz, 1999: Fully equivalent operational models
for atmospheric chemical kinetics within global chemistry-transport models.
Journal of Geophysical Research, 104(D23), 30,417-30,426. |
Abstract: A major portion of the computational
effort in simulations by three-dimensional (3-D) chemistry-transport models
is consumed in chemical kinetics calculations which repeatedly solve coupled
ordinary differential equations. To address this burden, this
paper introduces a high-speed fully equivalent operational model (FEOM)
for chemical kinetics calculations. The FEOM consists of a hierarchical
correlated-function expansion capturing the input-output relationships
of chemical kinetics. As an initial test of the FEOM approach for
chemical kinetics calculations in 3-D models, this paper develops the FEOMs
for CO-CH4-NOy-H2O
chemistry to obtain the time-dependent chemical ozone production and destruction
rates in global chemistry-transport model (GCTM) simulations. The
FEOMs are constructed for all GCTM model levels, all 12 months of the year,
every 10° of latitude, for two types of surface albedo, and for all
tropospheric values of H2O, CO, NOx,
and O3. It is shown that the simulated
global ozone fields using the FEOMs in the GCTM ozone simulation are at
least as accurate and in some cases better than those obtained by using
four-dimensional interpolative look-up tables. Future work will expand
the FEOM approach to more detailed chemical schemes, including nonmethane
hydrocarbon chemistry in 3-D chemistry-transport model simulations. |