ECV Products and Requirements for Ice Sheets & Ice Shelves
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 |
Frequency |
Resolution | Required Measurement Uncertainty |
Stability |
Standards/ References |
| Surface Elevation Change | Local measurements of the height above a reference (geoid or ellipsoid) of the snow-air surface or uppermost firn layers | 30 days | Horizontal 100 m | 0.1 m/ year | 0.1 m/ year | |
| Ice Velocity | Surface-parallel vector of the surface ice flow | 30 days | Horizontal 100 m | 0.1 m/ year | 0.1 m/ year | |
| Ice Mass Change | Direct measurement of local mass changes or inferred mass change from combining measurements | 30 days | Horizontal 50 km | 10 km3/ year | 10 km3/ year | |
| Grounding Line Location and Thickness | Location of the line (zone) where ice outflow to an ocean begins to float | Yearly | Horizontal 100 m; Vertical 10 m | 1 m | 10 m |
