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. We present a full-year online global simulation of tropospheric chemistry(158 coupled species) at cubed-sphere c720 ( ∼ 12.5 × 12.5 km 2 ) resolution in the NASA Goddard EarthObserving System Model version 5 Earth system model (GEOS-5 ESM) withGEOS-Chem as a chemical module (G5NR-chem). The GEOS-Chem module within GEOSuses the exact same code as the offline GEOS-Chem chemical transport model(CTM) developed by a large atmospheric chemistry research community. In thisway, continual updates to the GEOS-Chem CTM by that community can beseamlessly passed on to the GEOS chemical module, which remains state of thescience and referenceable to thelatest version of GEOS-Chem. The 1-year G5NR-chem simulation was conducted toserve as the Nature Run for observing system simulation experiments (OSSEs)in support of the future geostationary satellite constellation fortropospheric chemistry. It required 31 wall-time days on 4707 compute coreswith only 24 % of the time spent on the GEOS-Chem chemical module. Resultsfrom the GEOS-5 Nature Run with GEOS-Chem chemistry were shown to beconsistent to the offline GEOS-Chem CTM and were further compared to globaland regional observations. The simulation shows no significant global biasfor tropospheric ozone relative to the Ozone Monitoring Instrument (OMI)satellite and is highly correlated with observations spatially andseasonally. It successfully captures the ozone vertical distributionsmeasured by ozonesondes over different regions of the world, as well asobservations for ozone and its precursors from the August–September 2013Studies of Emissions, Atmospheric Composition, Clouds and Climate Coupling byRegional Surveys (SEAC 4 RS) aircraft campaign over the southeast US. Itsystematically overestimates surface ozone concentrations by 10 ppbv at sites in the US and Europe, a problem currently beingaddressed by the GEOS-Chem CTM community and from which the GEOS ESM willbenefit through the seamless update of the online code.

geoscientific model development

Global simulation of tropospheric chemistry at 12.5 km resolution: performance and evaluation of the GEOS-Chem chemical module (v10-1) within the NASA GEOS Earth system model (GEOS-5 ESM)