We present the Efficient CH4–CO–OH (ECCOH) chemistry
module that allows for the simulation of the methane, carbon monoxide, and
hydroxyl radical (CH4–CO–OH) system, within a chemistry climate model,
carbon cycle model, or Earth system model. The computational efficiency of
the module allows many multi-decadal sensitivity simulations of the
CH4–CO–OH system, which primarily determines the global atmospheric
oxidizing capacity. This capability is important for capturing the nonlinear
feedbacks of the CH4–CO–OH system and understanding the perturbations
to methane, CO, and OH, and the concomitant impacts on climate. We
implemented the ECCOH chemistry module in the NASA GEOS-5 atmospheric global
circulation model (AGCM), performed multiple sensitivity simulations of the
CH4–CO–OH system over 2 decades, and evaluated the model output with
surface and satellite data sets of methane and CO. The favorable comparison
of output from the ECCOH chemistry module (as configured in the GEOS-5 AGCM)
with observations demonstrates the fidelity of the module for use in
scientific research
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