SNAP documentation
List of variables
Variable names have been chosen so that they're consistent across the datasets. Where possible the names have been chosen to be consistent with the ERA-Interim variable names. Where this isn't possible variable names have been indicated with a *.
Dimensions
All the dimensions should have lower case variable names
| Variable name | Variable description | Units | Found in datasets | Aliases |
|---|---|---|---|---|
| t | time | hours since the start time | All of them | time |
| t_2* | time (a 2nd time axis) | hours since the start time | CAWCR | time (CAWCR) |
| latitude | latitude | Degrees north | All of them | lat (CAWCR, MRI), y (MRI) |
| latitude_2* | latitude (a 2nd latitude axis) | Degrees north | KOPRI, METO | lat (KOPRI), latitude_1 (METO) |
| longitude | longitude | Degrees east | All of them | lon (CAWCR, MRI), x (MRI) |
| longitude_2* | longitude (a 2nd longitude axis) | Degrees north | KOPRI, METO | lat (KOPRI), longitude_1 (METO) |
| p | pressure | hPa | All of them | lev (CAWCR), plev (MRI) |
| p_2* | pressure (a 2nd pressure axis) | hPa | CAWCR | lev_3 (CAWCR) |
| theta | potential temperature | K | CAWCR, MRI | lev_2 (CAWCR) |
Variables
All the variables should have upper case variable names
| Variable name | Variable description | Units | Dimensions | Found in datasets | Aliases |
|---|---|---|---|---|---|
| GWESP* | Eastward force from spectral gw scheme | m s2 | (longitude, latitude, pres_upp, t) or (longitude, latitude, hybrid_ht, t) | CAWCR, METO | gwEforSP (CAWCR), field424 (METO) |
| GWNSP* | Northward force from spectral gw scheme | m s2 | (longitude, latitude, pres_upp, t) or (longitude, latitude, hybrid_ht, t) | CAWCR, METO | gwNforSP (CAWCR), field425 (METO) |
| GWOD* | Orographic gravity wave tendencies | m s2 | (longitude, latitude, pres_upp, t) | MRI | OGWD (MRI) |
| GWUBF* | U-acceleration from gw blocked flow | m s2 | (longitude, latitude, pres_upp, t) | CAWCR | gwUaccBF (CAWCR) |
| GWUSS* | U-acceleration from gw saturated stress | m s2 | (longitude, latitude, pres_upp, t) | CAWCR | gwUaccSS (CAWCR) |
| GWUT* | Tendency of eastward wind due to gravity wave drag | m s2 | (longitude, latitude, hybrid_ht, t) | METO | unspecified (METO) |
| GWVBF* | V-acceleration from gw blocked flow | m s2 | (longitude, latitude, pres_upp, t) | CAWCR | gwUaccBF (CAWCR) |
| GWVSS* | V-acceleration from gw saturated stress | m s2 | (longitude, latitude, pres_upp, t) | CAWCR | gwVaccSS (CAWCR) |
| GWVT* | Tendency of eastward wind due to gravity wave drag | m s2 | (longitude, latitude, hybrid_ht, t) | METO | unspecified (METO) |
| PRES | Pressure | Pa | (longitude, latitude, hybrid_ht, t) | METO | p (METO: ape) |
| PRES_2 | Pressure at lower levels | Pa | (longitude, latitude, hybrid_ht_low, t) | METO | p_1 (METO: ape) |
| PV | Potential vorticity | K m2/kg/s | (longitude, latitude, theta, t) | All of them? | EPV (CAWCR), pv (METO) |
| T | Temperature | K | (longitude, latitude, pres, t) | All of them? | temp (METO: apc) |
| T_2 | Temperature at lower levels | K | (longitude, latitude, hybrid_ht_low, t) | METO | temp (METO: ape) |
| T1_5* | 1.5 metre temperature | K | (longitude, latitude, t) | METO | temp (METO) |
| T2 | 2 metre temperature | K | (longitude, latitude, t) | CAWCR | T2m (CAWCR, MRI) |
| TPR* | Total precipitation rate | kg m-2s-1 | (longitude, latitude, t/t_2) | METO | hr24_prcp/86400 (CAWCR), Precip (MRI), precip (METO: apa) |
| U | U velocity | m/s | (longitude, latitude, pres, t) | All of them? | u (METO: apc) |
| U10 | 10 metre U wind component | m/s | (longitude, latitude, t) | CAWCR, METO | u10m (CAWCR), u (METO: apa) |
| V | V velocity | m/s | (longitude, latitude, pres, t) | All of them? | v (METO: apc) |
| V10 | 10 metre U wind component | m/s | (longitude, latitude, t) | CAWCR, METO | v10m (CAWCR), u (METO: apa) |
| ZH | Geopotential height | m | (longitude, latitude, pres, t) | All of them? | geop_ht (CAWR) |