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- Data on constant pressure levels (type=pl) are provided at level=100 only.
- Data on theta levels (type=pt) are provided at level=300 for type=fc and level=265 only for type=an.
- Data on potential vorticity levels (levtype=pv) are provided at level=1500 only.
- Parameters accumulated from the start of the forecast have the ecCodes startStep key consistently set to 0 and, consequently, stepRange=0-24 in GRIB2 compared to stepRange=24, etc, in GRIB1
- Parameters accumulated from the start of the forecast are not provided at stepRange=0.
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Directory structure of static sample dataset on disk
Data are ordered in a MARS-like folder structure under <root_dir>/<class>/<stream>/<type>/<levtype>. Shown below is a diagrammatic layout of the directory structure under <root_dir>=/ec/vol/mtg2_sample/:
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For example, in GRIB1, there is a paramId for Volumetric soil water layer 1 and a different paramId for Volumetric soil water layer 2, etc. In GRIB2, only a single paramId is used for Volumetric soil water, with the layer 1 having level=1 and layer 2 having level=2.
| 139 | stl1 | 260360 | sot | 1 | Soil temperature | K |
| 170 | stl2 | 260360 | sot | 2 | Soil temperature | K |
| 183 | stl3 | 260360 | sot | 3 | Soil temperature | K |
| 236 | stl4 | 260360 | sot | 4 | Soil temperature | K |
| 39 | swvl1 | 260199 | vsw | 1 | Volumetric soil moisture | m**3 m**-3 |
| 40 | swvl2 | 260199 | vsw | 2 | Volumetric soil moisture | m**3 m**-3 |
| 41 | swvl3 | 260199 | vsw | 3 | Volumetric soil moisture | m**3 m**-3 |
| 42 | swvl4 | 260199 | vsw | 4 | Volumetric soil moisture | m**3 m**-3 |
| 35 | istl1 | 262024 | sit | 1 | Sea ice temperature | K |
| 36 | istl2 | 262024 | sit | 2 | Sea ice temperature | K |
| 37 | istl3 | 262024 | sit | 3 | Sea ice temperature | K |
| 38 | istl4 | 262024 | sit | 4 | Sea ice temperature | K |
These parameters will be archived in MARS with levtype=sol (surface other levels). To retrieve these parameters in GRIB2, users will need to change their MARS requests to specify levtype=sol,levelist=1/2/3/4.
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To retrieve these parameters in GRIB2 from MARS, users will need to use the new paramId and also specify the statistical processing time window using a new MARS keyword that is to be introduced.
Maximum 10m wind gust
| 49 | 10fg | 237318 | max_i10fg | 1h/3h/6h | max | Time-maximum 10 metre wind gust | m s**-1 |
| 228028 | 10fg3 | 237318 | max_i10fg | 3h | max | Time-maximum 10 metre wind gust | m s**-1 |
| 123 | 10fg6 | 237318 | max_i10fg | 6h | max | Time-maximum 10 metre wind gust | m s**-1 |
Maximum and minimum 2m temperature
| 201 | mx2t | 237167 | max_2t | 1h/3h/6h | max | Time-maximum 2 metre temperature | K |
| 202 | mn2t | 238167 | min_2t | 1h/3h/6h | min | Time-minimum 2 metre temperature | K |
| 228026 | mx2t3 | 237167 | max_2t | 3h | max | Time-maximum 2 metre temperature | K |
| 228027 | mn2t3 | 238167 | min_2t | 3h | min | Time-minimum 2 metre temperature | K |
| 121 | mx2t6 | 237167 | max_2t | 6h | max | Time-maximum 2 metre temperature | K |
| 122 | mn2t6 | 238167 | min_2t | 6h | min | Time-minimum 2 metre temperature | K |
Maximum and minimum total precipitation rate
| 228226 | mxtpr | kg m**-2 s**-1 | 237055 | max_tprate | 1h/3h/6h | max | Time-maximum total precipitation rate | kg m**-2 s**-1 |
| 228227 | mntpr | kg m**-2 s**-1 | 238055 | min_tprate | 1h/3h/6h | min | Time-minimum total precipitation rate | kg m**-2 s**-1 |
| 228222 | mxtpr3 | kg m**-2 s**-1 | 237055 | max_tprate | 3h | max | Time-maximum total precipitation rate | kg m**-2 s**-1 |
| 228223 | mntpr3 | kg m**-2 s**-1 | 238055 | min_tprate | 3h | min | Time-minimum total precipitation rate | kg m**-2 s**-1 |
| 228224 | mxtpr6 | kg m**-2 s**-1 | 237055 | max_tprate | 6h | max | Time-maximum total precipitation rate | kg m**-2 s**-1 |
| 228225 | mntpr6 | kg m**-2 s**-1 | 238055 | min_tprate | 6h | min | Time-minimum total precipitation rate | kg m**-2 s**-1 |
Maximum CAPE and CAPE Shear
| 228035 | mxcape6 | J kg**-1 | 237287 | max_cape | 6h | max | Time-maximum convective available potential energy | J kg**-1 |
| 228036 | mxcapes6 | m**2 s**-2 | 237321 | max_capes | 6h | max | Time-maximum convective available potential energy shear | m**2 s**-2 |
Mean total lightning flash density
| 228051 | litota1 | km**-2 day**-1 | 235326 | avg_litoti | 1h/3h/6h | avg | Time-mean total lightning flash density | km**-2 day**-1 |
| 228057 | litota3 | km**-2 day**-1 | 235326 | avg_litoti | 3h | avg | Time-mean total lightning flash density | km**-2 day**-1 |
| 228058 | litota6 | km**-2 day**-1 | 235326 | avg_litoti | 6h | avg | Time-mean total lightning flash density | km**-2 day**-1 |
Most severe and most frequent precipitation type
| 260318 | ptype_sev1h | 260682 | sev_ptype | 1h | severity | Time-severity precipitation type |
| 260319 | ptype_sev3h | 260682 | sev_ptype | 3h | severity | Time-severity precipitation type |
| 260338 | ptype_sev6h | 260682 | sev_ptype | 6h | severity | Time-severity precipitation type |
| 260320 | ptype_freq1h | 260683 | freq_ptype | 1h | mode | Time-mode precipitation type |
| 260321 | ptype_freq3h | 260683 | freq_ptype | 3h | mode | Time-mode precipitation type |
| 260339 | ptype_freq6h | 260683 | freq_ptype | 6h | mode | Time-mode precipitation type |
Ocean model output
The paramId's and shortNames for the following output from the ocean model have changed. In addition:
- the unit of Sea surface practical salinity and Average sea water practical salinity in the upper 300 m has changed from psu to g/kg;
- the unit of the Average sea water potential temperature in the upper 300m has changed from degrees Celsius to Kelvin.
| 151130 | so | psu | 262100 | sos | Sea surface practical salinity | g kg**-1 |
| 151131 | ocu | m s**-1 | 262140 | sve | Eastward surface sea water velocity | m s**-1 |
| 151132 | ocv | m s**-1 | 262139 | svn | Northward surface sea water velocity | m s**-1 |
| 151145 | zos | m | 262124 | zos | Sea surface height | m |
| 151148 | mld | m | 3067 | mld | Mixed layer depth | m |
| 151163 | t20d | m | 262104 | t20d | Depth of 20 C isotherm | m |
| 151164 | tav300 | degrees C | 262144 | pt300m | Average sea water potential temperature in the upper 300m | K |
| 151175 | sav300 | psu | 262118 | sc300m | Average sea water practical salinity in the upper 300 m | g kg**-1 |
| 174098 | sithick | m | 262000 | sithick | Sea ice thickness | m |
Fluxes of chemical species
In GRIB1, parameters that are fluxes of chemical species have different paramIds for each chemical species and type of flux. In GRIB2, a unique paramId indicates the type of flux and a new key called chemShortName identifies the chemical. For example, paramId=435000 refers to the Net ecosystem exchange flux and the chemShortName=CO2 identifies this as the Carbon dioxide net ecosystem exchange flux.
| 228080 | aco2nee | kg m**-2 | 435002 | aneef | CO2 | accum | Accumulated net ecosystem exchange flux | kg m**-2 |
| 228081 | aco2gpp | kg m**-2 | 436002 | agppf | CO2 | accum | Accumulated gross primary production flux | kg m**-2 |
| 228082 | aco2rec | kg m**-2 | 437002 | aerf | CO2 | accum | Accumulated ecosystem respiration flux | kg m**-2 |
| 228083 | fco2nee | kg m**-2 | 435000 | neef | CO2 | instant | Net ecosystem exchange flux | kg m**-2 s**-1 |
| 228084 | fco2gpp | kg m**-2 | 436000 | gppf | CO2 | instant | Gross primary production flux | kg m**-2 s**-1 |
| 228085 | fco2rec | kg m**-2 | 437000 | erf | CO2 | instant | Ecosystem respiration flux | kg m**-2 s**-1 |
To retrieve these parameters in GRIB2 from MARS, users will need to use the new paramId and also specify the chemical species using the MARS keyword, chem.