edu.ucar.opensky::articles:16720 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T03:08:46.841389 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d75x2b4p The terminator "toy" chemistry test: A simple tool to assess errors in transport schemes 2015-05-04T00:00:00Z publication https://n2t.org/ark:/85065/d75x2b4p https://doi.org/10.5194/gmd-8-1299-2015 Lauritzen, Peter H. author Conley, Andrew J. author Lamarque, Jean-François author Vitt, Francis M. author Taylor, M. author UCAR/NCAR - Library publisher 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License. None eng geoscientificInformation