Name | Units | Description |
2m temperature | K | Temperature of the air near the surface. |
Maximum 2m temperature in the last 24 hours | K | Daily maximum near-surface air temperature. |
Minimum 2m temperature in the last 24 hours | K | Daily minimum near-surface air temperature. |
| Skin temperature | K | Temperature at the interface (not the bulk temperature of the medium above or below) between air and sea for open-sea regions. |
| Mean sea level pressure | Pa | Time average of the air pressure at sea level. |
| Surface pressure | Pa | Pressure of air at the lower boundary of the atmosphere |
| 10m u component of wind | m s-1 | Magnitude of the eastward component of the two-dimensional horizontal air velocity near the surface. |
| 10m v component of wind | m s-1 | Magnitude of the northward component of the two-dimensional horizontal air velocity near the surface. |
| 10m wind speed | m s-1 | Magnitude of the two-dimensional horizontal air velocity near the surface. |
| Near surface (2m) relative humidity | % | Amount of moisture in the air near the surface divided by the maximum amount of moisture that could exist in the air at a specific temperature and location. |
| Near surface (2m) specific humidity | Dimensionless | Amount of moisture in the air near the surface divided by amount of air plus moist at that location. |
| Mean precipitation flux | kg m-2 s-1 | Amount of water per unit area and time. |
| Snowfall | kg m-2 s-1 | Mass of water in the form of snow precipitating per unit area. |
| Evaporation | kg m-2 s-1 | Evaporation rate. It includes conversion to vapour phase from both the liquid and solid phase, i.e., includes sublimation. |
| Eastward turbulent surface stress | Pa | Eastward component of the horizontal drag exerted by the atmosphere on the surface through turbulent processes. |
| Northward turbulent surface stress | Pa | Northward component of the horizontal drag exerted by the atmosphere on the surface through turbulent processes. |
| Surface latent heat flux | W m-2 | Flux per unit area of heat between the surface and the air on account of evaporation including sublimation. Positive when directed upward (negative downward). |
| Surface sensible heat flux | W m-2 | Flux per unit area of heat between the surface and the air by motion of air only. Positive when directed upward (negative downward). |
| Surface thermal radiation downwards | W m-2 | Radiation inciding on the surface from the above per unit area. |
Surface upwelling longwave radiation | W m-2 | Longwave radiation from the surface per unit area. |
Surface solar radiation downwards | W m-2 | Radiative shortwave flux of energy downward at the surface. |
Surface upwelling shortwave radiation | W m-2 | Shortwave radiation from the surface per unit area. |
TOA incident solar radiation | W m-2 | Incident solar radiation at the top of atmosphere |
| TOA outgoing shortwave radiation | W m-2 | Shortwave radiation from the top of the atmosphere to space per unit area. |
| TOA outgoing longwave radiation | W m-2 | Longwave radiation from the top of the atmosphere to space per unit area. |
| Total cloud cover | Dimensionless | Total refers to the whole atmosphere column, as seen from the surface or the top of the atmosphere. Cloud cover refers to fraction of horizontal area occupied by clouds. |
| Air temperature | K | Temperature of the air. |
| U-component of wind | m s-1 | Magnitude of the eastward component of the two-dimensional horizontal air velocity. |
| V-component of wind | m s-1 | Magnitude of the northward component of the two-dimensional horizontal air velocity. |
| Relative humidity | % | Amount of moisture in the air divided by the maximum amount of moisture that could exist in the air at a specific temperature and location. |
| Specific humidity | Dimensionless | Amount of moisture in the air divided by amount of air plus moisture at that location. |
| Geopotential height | m | Gravitational potential energy per unit mass normalised by the standard gravity at mean sea level at the same latitude. It is also used as vertical coordinate referenced to Earth's mean sea level since its value is proportional to the elevation above the mean sea level. |
| Surface snow amount | kg m-2 | Snow amount on the ground, excluding that on the plant or vegetation canopy, per unit area. |
| Snow depth | m |
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| Runoff | kg m-2 s-1 | Amount per unit area of surface and subsurface liquid water which drains from land. |
| Soil moisture contentColour picker | kg m-2 | Vertical sum per unit area from the surface down to the bottom of the soil model of water in all phases contained in soil. |
| Sea-ice area percentage | Dimensionless | Area of the sea surface occupied by sea ice. |
| Sea ice thickness | m | Vertical extent of ocean sea ice. |
| Sea ice plus snow amount | kg m-2 | Mass per unit area of sea ice plus snow in the ocean portion of the grid cell averaged over the entire ocean portion, including the ice-free fraction. Reported as 0.0 in regions free of sea ice. |
| Sea ice surface temperature | K | Temperature that exists at the interface of tea sea-ice and the overlying medium which may be air or snow. |
| Sea surface temperature | K | Temperature of sea water near the surface. |
| Sea surface salinity | 1e-3 |
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| Sea surface height above geoid | m | Vertical distance between the actual sea surface and a surface of constant geopotential with which mean sea level would coincide if the ocean were at rest. |
| Grid-cell area for ocean variables | m2 |
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| Sea area percentage | % |
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| Grid-cell area for atmospheric grid variables | m2 |
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| Capacity of soil to store water (field capacity) | kg m-2 |
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| Percentage of grid cell occupied by land (including lakes) | % |
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| Land ice area percentage | 1 |
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| Orography | m |
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