Topography in ClimaAtmos

• Dataset source: https://www.ncei.noaa.gov/products/etopo-global-relief-model
• ClimaArtifact: https://github.com/CliMA/ClimaArtifacts/tree/main/earth_orography

We use the ClimaUtilities SpaceVaryingInput tool to regrid (using linear interpolation) the ETOPO2022 ice-surface elevation dataset (see ClimaArtifacts) onto the required spectral element horizontal grid. The file examples/topography_spectra.jl provides tools to generate such regridded fields (and their spectra) on user-defined horizontal spaces. For existing ClimaAtmos simulation data, the orog_inst.nc dataset from the default diagnostic outputs contains this regridded elevation. As an example, we include plots of the generated topography on a cubed sphere with 16 elements and 64 elements per panel edge, and compare unsmoothed and smoothed datasets to show the effect of our topography smoothing methods.

• Elevation data (elems per panel = 16)

• Elevation data (elems per panel = 64)