Snow
Change in Snow Cover Extent
Figure: 12-month running anomalies of monthly snow extent are plotted on the 7th month using values from November 1966 to December 2018. Source : Global Snow Lab,, https://climate.rutgers.edu/snowcover/chart_anom.php?ui_set=0&ui_region… |
ECV Products and Requirements
These products and requirements reflect the Implementation Plan 2022 (GCOS-244).
The requirements are found in the complete 2022 ECVs Requirements document as well: ECV Snow.
| Products | Area Covered by Snow | Snow Depth | Snow-Water Equivalent | ||||||
| (*) | Unit | Values | Unit | Values | Unit | Values | |||
| Horizontal Resolution | G | m | 50 | km | 0.5 | km | 0.5 | ||
| B | 500 | 5 | 5 | ||||||
| T | 1000 | 25 | 25 | ||||||
| Vertical Resolution | G | - | - | - | |||||
| B | - | - | - | ||||||
| T | - | - | - | ||||||
| Temporal Resolution | G | h | 6 | d | 6 | h | 6 | ||
| B | 24 | 24 | 24 | ||||||
| T | 48 | 48 | 48 | ||||||
| Timeliness | G | h | 3 | h | 1 | h | 3 | ||
| B | 24 | 6 | 24 | ||||||
| T | 240 | 24 | 240 | ||||||
| Required Measurement Uncertainty (2-sigma) | G | % | 5 | mm | 10 | mm | 1 | ||
| B | 15 | 25 | 5 | ||||||
| T | 20 | 50 | 10 | ||||||
| Stability | G | % | 1 | cm | 1 | mm | 5 | ||
| B | 5 | 2 | 8 | ||||||
| T | 10 | 5 | 10 | ||||||
(*) Goal (G): an ideal requirement above which further improvements are not necessary. Breakthrough (B): an intermediate level between threshold and goal which, if achieved, would result in a significant improvement for the targeted application. The breakthrough value may also indicate the level at which specified uses within climate monitoring become possible. It may be appropriate to have different breakthrough values for different uses. Threshold (T): the minimum requirement to be met to ensure that data are useful.
Data sources
This list provides sources for openly accessible data sets with worldwide coverage for which metadata is available. It is curated by the respective GCOS ECV Steward(s). The list does not claim to be complete. Anyone with a suitable dataset who wishes it to be added to this list should contact the abombelli
wmo [dot] int (GCOS Secretariat).
- National Snow & Ice Data Center
- Copernicus GMES Service Snow and Land Ice
- Satellite ECV Inventory by the CEOS/CGMS Working Group on Climate (WGClimate)
