SUMMIT 1.4 km NDJF seasonal run dataset: Catalogue

This confluence page provides a data catalogue for the SUMMIT 1.4 km NDJF seasonal run performed on the Oak Ridge supercomputer, which serves as a prototype dataset for the Destination Earth project.

The data is accessible via Polytope (see here) or via the ECMWF MARS Web API (see the data landing page and instructions here https://doi.org/10.21957/rfrp-8h86).

Temporal resolution

The output is at 3 hourly resolution. For the purposes of this sample, steps [0, 3, 6, 9, 12, 15, 18, 21, 24, 27] have been made available. The run start date and time is 2018-11-01, 00:00:00.

More model steps and output variables will be made available as required.

Spatial resolution

The output is provided on one of two types of horizontal grid, both of which correspond to approximately 1.4 km horizontal resolution:

• O8000: ECMWF octahedral (reduced) Gaussian grid with 8000 latitude lines between the pole and equator (global)
• T_CO7999: ECMWF spherical harmonics with 7999 spectral components (global)

The grid type for each group of parameters is specified below.

The data on the T_CO7999 grid can be truncated or regridded to mirror the output resolution of the HRES forecast.
This is achieved using the following keywords:

To truncate to spectral resolution T_CO1279 use:

• 'truncation' : '1279'

To regrid the data to the octahedral O1280 grid use:

• 'grid' : 'O1280'

To regrid the data to a regular lat/long 0.1/0.1 degree grid use:

• 'grid' : '0.1/0.1'

This will improve the download time of the spectral data but reduce the resolution of the data.

Output fields

Surface fields

The parameters at surface level are provided on the O8000 grid and are as follows:

Update (2023-12-08):

The following additional surface level parameters are now supported with ecCodes version of at least 2.32.1.
The parameters are also provided on the O8000 grid and are as follows:

Layer-based fields

The parameters on "levtype=sol", i.e. those produced from layer-based models (such as soil and ice layers), on the O8000 grid are as follows:

Update (2023-12-08):

The following additional layer-based parameters are now supported with ecCodes version of at least 2.32.1.
The parameters are also provided on the O8000 grid and are as follows:

Model level fields

The parameters on model levels (1 to 137; with model level 137 representing the lowest height), on the O8000 grid are as follows:

The parameters on model levels (1 to 137; with model level 137 representing the lowest height), on the T_CO7999 grid are as follows:

Pressure level fields

The parameters on pressure levels (1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 700, 850, 925, 1000), on the O8000 grid are as follows:

The parameters on pressure levels (1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 700, 850, 925, 1000), on the T_CO7999 grid are as follows: