Network for the Detection of Atmospheric Composition Change

Theory and Analysis group

REPLAY Model Data Set
Contact Person: Sarah A. Strode (sarah.a.strode@nasa.gov)
GEOS-GMI replay simulations use the Global Modeling Initiative (GMI) chemistry mechanism (Duncan et al., 2007; Strahan et al, 2013; Nielsen et al., 2017) to simulate global tropospheric and stratospheric chemistry within the Goddard Earth Observing System (GEOS) model (Molod et al., 2015). A replay technique (Orbe et al, 2017) is used to “replay” the model’s meteorology to reanalysis fields. We extracted output at the locations of the NDACC stations from a GEOS-GMI simulation that replayed to meteorological fields from the Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) reanalysis (Gelaro et al, 2017). The simulation has a horizontal resolution of approximately 25km and includes time-dependent emissions, as described in Fisher et al. (2024).
https://acd-ext.gsfc.nasa.gov/Projects/GEOSCCM/
https://ndacc.larc.nasa.gov/data/ma-directory/ndacc-working-groups/theory-analysis

The GMI Model
The GMI Chemistry and Transport Model (CTM) simulates global stratospheric and tropospheric chemistry using the GMI chemical mechanism. Output is extracted at NDACC station locations. Transport in the GMI CTM simulation is driven by MERRA-2 meteorological fields. The simulation has a horizontal resolution of 1.25°x1°. Additional information is available on the websites below:
https://gmi.gsfc.nasa.gov/merra2hindcast
https://ndacc.larc.nasa.gov/data/ma-directory/ndacc-working-groups/theory-analysis

The CLaMS Model
Contact Person: Bärbel Vogel (b.vogel@fz-juelich.de)
The Chemical Lagrangian Model of the Stratosphere (CLaMS) was developed during the last decades at Institute of Climate and Energy Systems (Stratosphere: ICE-4) at the Research Center Jülich (Germany). CLaMS can be used as a conceptual trajectory model, in an offline, reanalysis-driven chemistry transport model version or online in a climate model version. Different CLaMS products such as pure trajectory calculation, artificial model tracers to tag air masses (e.g. surface origin tracers, age of air) as wells as chemical traces gases in the upper troposphere and stratosphere can be made available on request. More details are available on the ICE-4 website:
https://www.fz-juelich.de/en/ice/ice-4/about_us/ice4-theory
https://www.fz-juelich.de/en/ice/ice-4/research/synergetic-use-of-instruments-and-models/climate-and-atmospheric-process-modeling