Why does one observe discontinuities in the precipitation field occasionally on coastlines or near the Canadian border?
The analyzed precipitation used for precipitation assimilation comes from four sources. Over the continental United States, the analysis comes from a gage dataset and is analyzed onto a 1/8-degree grid using the PRISM mountain mapper and a least-squares distance weighting scheme. Over Mexico and Canada, the analysis comes from gage datasets analyzed onto 1-degree grids. Neither of those datasets has PRISM or a least-squares weighting scheme. Over the rest of the domain, the CMAP dataset is used. CMAP is a combination of gage and satellites, analyzed onto a 1-degree grid. Despite an attempt at a smooth blending, we still see discontinuities between the different datasets, especially around coastlines and borders of countries.
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