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| Old paramId | Old shortName | Old name | Old units | New paramId | New shortName | New name | New units |
|---|---|---|---|---|---|---|---|
| 151130 | so | Sea water practical salinity | psu | 262100 | sos | Sea surface practical salinity | g kg**-1 |
| 151131 | ocu | Eastward surface sea water velocity | m s**-1 | 262140 | sve | Eastward surface sea water velocity | m s**-1 |
| 151132 | ocv | Northward surface sea water velocity | m s**-1 | 262139 | svn | Northward surface sea water velocity | m s**-1 |
| 151145 | zos | Sea surface height | m | 262124 | zos | Sea surface height | m |
| 151148 | mld | Mixed layer depth | m | 3067 | mld | Mixed layer depth | m |
| 151163 | t20d | Depth of 20C isotherm | m | 262104 | t20d | Depth of 20 C isotherm | m |
| 151164 | tav300 | Average potential temperature in the upper 300m | degrees C | 262144 | pt300m | Average sea water potential temperature in the upper 300m | K |
| 151175 | sav300 | Average sea water practical salinity in the upper 300m | psu | 262118 | sc300m | Average sea water practical salinity in the upper 300 m | g kg**-1 |
| 174098 | sithick | Sea-ice thickness | 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.
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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.