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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
Geosci. Model Dev., 8, 1299-1313, 2015
https://doi.org/10.5194/gmd-8-1299-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model experiment description paper
04 May 2015
The terminator "toy" chemistry test: a simple tool to assess errors in transport schemes
P. H. Lauritzen1, A. J. Conley1, J.-F. Lamarque1, F. Vitt1, and M. A. Taylor2 1National Center for Atmospheric Research, Boulder, Colorado, USA
2Sandia National Laboratories, Albuquerque, New Mexico, USA
Abstract. This test extends the evaluation of transport schemes from prescribed advection of inert scalars to reactive species. The test consists of transporting two interacting chemical species in the Nair and Lauritzen 2-D idealized flow field. The sources and sinks for these two species are given by a simple, but non-linear, "toy" chemistry that represents combination (X + X → X2) and dissociation (X2 → X + X). This chemistry mimics photolysis-driven conditions near the solar terminator, where strong gradients in the spatial distribution of the species develop near its edge. Despite the large spatial variations in each species, the weighted sum XT = X + 2X2 should always be preserved at spatial scales at which molecular diffusion is excluded. The terminator test demonstrates how well the advection–transport scheme preserves linear correlations. Chemistry–transport (physics–dynamics) coupling can also be studied with this test. Examples of the consequences of this test are shown for illustration.

Citation: Lauritzen, P. H., Conley, A. J., Lamarque, J.-F., Vitt, F., and Taylor, M. A.: The terminator "toy" chemistry test: a simple tool to assess errors in transport schemes, Geosci. Model Dev., 8, 1299-1313, https://doi.org/10.5194/gmd-8-1299-2015, 2015.
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Short summary
This test extends the evaluation of transport schemes from prescribed advection of inert scalars to reactive species. It consists of transporting two reacting chlorine-like species in an idealized flow field. The sources/sinks are given by a simple but non-linear toy chemistry that mimics photolysis-driven processes near the solar terminator. As a result, strong gradients in the spatial distribution of the species develop near the edge of the terminator.
This test extends the evaluation of transport schemes from prescribed advection of inert scalars...
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