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WRF Preprocessing System Version 4.0: Updates

WPS Version 4.0

Version 4.0 of the WRF Pre-Processing System (WPS) was released on 8 June 2018.

If you are not using some of the new datasets and/or new options, you should be able to use output from older WPS programs.

Also see 'Known Problems' in this release.

Release Notes:

  • Introduction of a 'lowres' option for geog_data_res to select coarse resolution
    (typically, 5-arc-minutes) sources for all mandatory static fields. This is useful
    in educational contexts or when the size of the geographical datasets must be minimized, e.g., when teaching with WRF/WPS in a Docker container or in the cloud.

  • New GEOGRID.TBL entry for a pre-computed urban fraction field (FRC_URB2D) based on 30-meter NLCD 2011 data.

  • A change in the default source of data for the MAXSNOALB and ALBEDO12M fields. The new defaults are MODIS-based and higher resolution (albedo is based on MODIS product MCD43C3, and snow albedo, 0.05 MODIS BRDF product).

  • Two fixes for numerical inaccuracies in the polar stereographic projection.

  • A new namelist option for ungrib, pmin, to specify the minimum pressure to extract from isobaric datasets.

  • A combined Vtable for all CFSR/CFSv2 data, both pressure-level and surface fields (Vtable.CFSR).

  • Added support for NCAR RDA's ECMWF "ds113.1" dataset.

  • Added support for FV3GFS GRIB data.

  • Generally, in the v4.0 release of the WPS, there is a move towards a model for handling geographical static fields in which all static fields that are not required by the default WRF namelist are optional from the viewpoint of geogrid.

    * Datasets that were previously mandatory but that are now optional: VAR_SSO and LAKE_DEPTH.
  • Note: There are now three types of downloads for the static, geographical data:

    1) Download the "full-resolution" sources for all default, mandatory fields.
    Use this download for all simulations where accuracy is important.

    2) Download the "low-resolution" sources for all mandatory fields.
    Use this download for testing and educational purposes.

    3) Downloads for individual, optional geographical fields.
    Obtain these datasets as needed by different model options.

 
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