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.

Spherical Harmonics

Data on spherical harmonics cannot be compressed and has a significantly larger file size per field than data on the octahedral grid (around 120MiB compared with around 16MiB).

Prototype Dataset

Please note that the prototype is not yet optimised for serving such high resolution data.
Thus, retrieving data for all model/pressure levels for a parameter on spherical harmonics will lead to a very large file and long wait times (several hours).
Please only retrieve a subset of model/pressure levels for this data for improved retrieval times.

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.

Data on the O8000 grid cannot currently be regridded on-the-fly

Please note that data on the O8000 grid cannot currently be regridded on-the-fly and will cause the retrieval to fail.
This is because the size of the interpolation matrices for the O8000 grid becomes too large. A parallel interpolation system is currently in development to deal with this high resolution data.

Output fields

Surface fields

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

paramId	shortName	Name	units
31	ci	Sea ice area fraction	(0 - 1)
33	rsn	Snow density	kg m**-3
34	sst	Sea surface temperature	K
47	dsrp	Direct solar radiation	J m**-2
50	lspf	Large-scale precipitation fraction	s
57	uvb	Downward UV radiation at the surface	J m**-2
58	par	Photosynthetically active radiation at the surface	J m**-2
78	tclw	Total column cloud liquid water	kg m**-2
79	tciw	Total column cloud ice water	kg m**-2
129	z	Geopotential	m2 s-2
136	tcw	Total column water	kg m**-2
137	tcwv	Total column vertically-integrated water vapour	kg m**-2
145	bld	Boundary layer dissipation	J m**-2
146	sshf	Surface sensible heat flux	J m**-2
147	slhf	Surface latent heat flux	J m**-2
151	msl	Mean sea level pressure	Pa
159	blh	Boundary layer height	m
165	10u	10 metre U wind component	m s**-1
166	10v	10 metre V wind component	m s**-1
167	2t	2 metre temperature	K
168	2d	2 metre dewpoint temperature	K
169	ssrd	Surface short-wave (solar) radiation downwards	J m**-2
172	lsm	Land-sea mask	(0 - 1)
175	strd	Surface long-wave (thermal) radiation downwards	J m**-2
176	ssr	Surface net short-wave (solar) radiation	J m**-2
177	str	Surface net long-wave (thermal) radiation	J m**-2
178	tsr	Top net short-wave (solar) radiation	J m**-2
179	ttr	Top net long-wave (thermal) radiation	J m**-2
180	ewss	Eastward turbulent surface stress	N m**-2 s
181	nsss	Northward turbulent surface stress	N m**-2 s
189	sund	Sunshine duration	s
195	lgws	Eastward gravity wave surface stress	N m**-2 s
196	mgws	Northward gravity wave surface stress	N m**-2 s
197	gwd	Gravity wave dissipation	J m**-2
208	tsrc	Top net short-wave (solar) radiation, clear sky	J m**-2
209	ttrc	Top net long-wave (thermal) radiation, clear sky	J m**-2
210	ssrc	Surface net short-wave (solar) radiation, clear sky	J m**-2
211	strc	Surface net long-wave (thermal) radiation, clear sky	J m**-2
212	tisr	TOA incident short-wave (solar) radiation	J m**-2
213	vimd	Vertically integrated moisture divergence	kg m**-2
229	iews	Instantaneous eastward turbulent surface stress	N m**-2
230	inss	Instantaneous northward turbulent surface stress	N m**-2
231	ishf	Instantaneous surface sensible heat flux	W m**-2
232	ie	Instantaneous moisture flux	kg m-2 s-1
235	skt	Skin temperature	K
238	tsn	Temperature of snow layer	K
244	fsr	Forecast surface roughness	m
245	flsr	Forecast logarithm of surface roughness for heat	Numeric
3020	vis	Visibility	m
3062	lsp	large scale precipitation	kg m**-2
3099	snom	Snowmelt	kg m**-2
160198	srcrea	Skin reservoir content	kg m**-2
228029	i10fg	Instantaneous 10 metre wind gust	m s**-1
228032	asn	Snow albedo	%
228089	tcrw	Total column rain water	kg m**-2
228090	tcsw	Total column snow water	kg m**-2
228141	sd	Snow depth water equivalent	kg m**-2
228143	cp	Convective precipitation	kg m**-2
228144	sf	Snow Fall water equivalent	kg m**-2
228164	tcc	Total Cloud Cover	%
228217	ilspf	Instantaneous large-scale surface precipitation fraction	(0 - 1)
228218	crr	Convective rain rate	kg m-2 s-1
228219	lsrr	Large scale rain rate	kg m-2 s-1
228220	csfr	Convective snowfall rate water equivalent	kg m-2 s-1
228221	lssfr	Large scale snowfall rate water equivalent	kg m-2 s-1
228228	tp	Total Precipitation	kg m**-2
231001	fzrawe	Accumulated freezing rain water equivalent	kg m**-2
231002	rowe	Runoff water equivalent	kg m**-2
231003	eswe	Snow evaporation water equivalent	kg m**-2
231005	peva	Potential evaporation	kg m**-2
231010	surfro	Surface runoff	kg m**-2
231012	ssurfro	Sub-surface runoff	kg m**-2
260015	ptype	Precipitation type	code table (4.201)
260121	kx	K index	K
260123	totalx	Total totals index	K
260259	eva	Evaporation	kg m**-2
260509	al	Forecast albedo	%

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:

paramId	shortName	Name	units
3073	lcc	Low cloud cover	%
3074	mcc	Medium cloud cover	%
3075	hcc	High cloud cover	%
228131	u10n	10 metre u-component of neutral wind	m s**-1
228132	v10n	10 metre v-component of neutral wind	m s**-1

Parameter units

Please take care with units. Parameters marked in yellow are those that are typically disseminated in units "(0-1)" or "m" in the ECMWF operational output.

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:

paramId	shortName	Name	units	levels
260199	vsw	Volumetric soil moisture	m3 m-3	1,2,3,4
260360	sot	Soil temperature	K	1,2,3,4

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:

paramId	shortName	Name	units	levels
262024	sit	Sea ice temperature	K	1,2,3,4

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:

paramId	shortName	Name	units
75	crwc	Specific rain water content	kg kg**-1
76	cswc	Specific snow water content	kg kg**-1
133	q	Specific humidity	kg kg**-1
246	clwc	Specific cloud liquid water content	kg kg**-1
247	ciwc	Specific cloud ice water content	kg kg**-1
248	cc	Fraction of cloud cover	(0 - 1)

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

paramId	shortName	Name	units
54	pres	Pressure	Pa
77	etadot	Eta-coordinate vertical velocity	s**-1
129	z	Geopotential	m2 s-2
130	t	Temperature	K
138	vo	Vorticity (relative)	s**-1
152	lnsp	Logarithm of surface pressure	Numeric
155	d	Divergence	s**-1
260238	wz	Geometric vertical velocity	m s**-1

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:

paramId	shortName	Name	units
60	pv	Potential vorticity	K m2 kg-1 s**-1
133	q	Specific humidity	kg kg**-1

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:

paramId	shortName	Name	units
129	z	Geopotential	m2 s-2
130	t	Temperature	K
135	w	Vertical velocity	Pa s**-1
138	vo	Vorticity (relative)	s**-1
155	d	Divergence	s**-1
157	r	Relative humidity	%
260238	wz	Geometric vertical velocity	m s**-1

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