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)
2018
Abstract. 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 Earth
Observing System Model version 5 Earth system model (GEOS-5 ESM) with
GEOS-Chem as a chemical module (G5NR-chem). The GEOS-Chem module within GEOS
uses the exact same code as the offline GEOS-Chem chemical transport model
(CTM) developed by a large atmospheric chemistry research community. In this
way, continual updates to the GEOS-Chem CTM by that community can be
seamlessly passed on to the GEOS chemical module, which remains state of the
science and referenceable to the
latest version of GEOS-Chem. The 1-year G5NR-chem simulation was conducted to
serve as the Nature Run for observing system simulation experiments (OSSEs)
in support of the future geostationary satellite constellation for
tropospheric chemistry. It required 31 wall-time days on 4707 compute cores
with only 24 % of the time spent on the GEOS-Chem chemical module. Results
from the GEOS-5 Nature Run with GEOS-Chem chemistry were shown to be
consistent to the offline GEOS-Chem CTM and were further compared to global
and regional observations. The simulation shows no significant global bias
for tropospheric ozone relative to the Ozone Monitoring Instrument (OMI)
satellite and is highly correlated with observations spatially and
seasonally. It successfully captures the ozone vertical distributions
measured by ozonesondes over different regions of the world, as well as
observations for ozone and its precursors from the August–September 2013
Studies of Emissions, Atmospheric Composition, Clouds and Climate Coupling by
Regional Surveys (SEAC 4 RS) aircraft campaign over the southeast US. It
systematically overestimates surface ozone concentrations by
10 ppbv at sites in the US and Europe, a problem currently being
addressed by the GEOS-Chem CTM community and from which the GEOS ESM will
benefit through the seamless update of the online code.
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