ECV Products and Requirements for Surface Water Vapour
These products and requirements reflect the Implementation Plan 2016 (GCOS-200). GCOS is reviewing and will update the requirements until 2022. More information on: gcos.wmo.int.
| PRODUCT | DEFINITION | FREQ. | RES. | REQUIRED MEASUREMENT UNCERTAINTY | STABILITY | STANDARDS/ REFERENCES |
| Water Vapour (Relative Humidity) | Relative humidity at a known height above surface, with the height specified in the metadata. It is the ratio of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated with respect to water or ice to be specified in the metadata (%) | Hourly | Site | RH 1% | 0.5%/ decade | Kate Willet |
| Water Vapour (Dew Point) | Temperature to which air must be cooled to become saturated with water vapour at a known height above surface, with the height specified in the metadata (K) | Hourly | Site | DP 0.1K | 0.02K/ decade | Kate Willet |
