The scripts to download the original ERA5 data are contained in the [`ERA5_downloads.zip`](./ERA5_downloads.zip) file located in the current directory of the repository. The scripts are written by [Quoqiang Tang](
[email protected]) and [Wouter Knoben](
[email protected]) as part of the [Community Workflows to Advance Reproducibility in Hydrological Modelling (CWARHM)](https://github.com/CH-Earth/CWARHM). "ERA5 data preparation includes interactions between an atmospheric model and a land surface model. ... [Original] ERA5 data is available at 137 different pressure levels (i.e. some height above the surface), as well as at the surface. The lowest atmospheric level is L137, at geopotential and geometric altitude 10m and data here relies only on the atmospheric model. Any variables at a height lower than L137 (i.e., at the surface) are the result of interpolation between atmospheric model and land model. We want to use only the outcomes from the ECMWF atmospheric model [...]. Therefore, we obtain (1) air temperature, (2) wind speed and (3) specific humidity at the lowest pressure level (L137), (4) Precipitation, (5) downward shortwave radiation, (6) downward longwave radiation and (7) air pressure are unaffected by the land model coupling and can be downloaded at the surface level. This is beneficial because surface-level downloads are substantially faster than pressure-level downloads. [^1]"
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