Variable:
Air specific humidity (near surface)
Requirements defined for Air specific humidity (near surface) (6)
This tables shows all related requirements. For more
operations/filtering, please consult the full list of
Requirements
Note: In reading the values, goal is marked blue,
breakthrough green, threshold orange
Application-dependent Technical Priority (ATP) Magenta and Relative priority of the attributes Red
| Id | Variable | Layer | App Area | ATP | Uncertainty | Layer/s Quality | Coverage Quality | Stability / decade | Hor Res | Ver Res | Obs Cyc | Timeliness | Coverage | Conf Level | Val Date | Source | General Comment | Application Area Comment | Horizontal Coverage Comment | Observation Comment | Performance Comment |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Air specific humidity (near surface) | Near Surface | CLIC (deprecated) | 10 g kg-1 12 g kg-1 20 g kg-1 |
100 km 200 km 500 km |
12 h 18 h 24 h |
24 h 36 h 2 d |
Global | tentative | 1998-10-29 | WCRP | ||||||||||
| 69 | Air specific humidity (near surface) | Near Surface | Climate-AOPC (deprecated) | 1 g kg-1 1.3 g kg-1 2 g kg-1 |
25 km 50 km 100 km |
3 h 4 h 6 h |
24 h 2 d 3 d |
Global | speculative | 2007-07-19 | AOPC | ||||||||||
| 252 | Air specific humidity (near surface) | Near Surface | 2.1 Global Numerical Weather Prediction and Real-time Monitoring | 2 g kg-1 5 g kg-1 10 g kg-1 |
15 km 50 km 250 km |
60 min 3 h 12 h |
6 min 30 min 6 h |
Global | reasonable | 2009-02-10 | John Eyre | ||||||||||
| 337 | Air specific humidity (near surface) | Near Surface | 2.2 High-Resolution Numerical Weather Prediction | 2 g kg-1 5 g kg-1 10 g kg-1 |
1 km 5 km 20 km |
10 min 30 min 2 h |
10 min 30 min 2 h |
Global | reasonable | 2019-12-04 | JF Mahfouf | ||||||||||
| 722 | Air specific humidity (near surface) | Near Surface | 2.8 Aeronautical Meteorology | 1 g kg-1 2 g kg-1 5 g kg-1 |
30 min 60 min 2 h |
5 min 10 min 30 min |
Point | firm | 2014-03-27 | J van der Meulen | At the aerodrome; to derive relative humidity and dewpoint temperature (using air temperature [at surface]); not typically measured at 2 m height. | ||||||||||
| 985 | Air specific humidity (near surface) | Near Surface | 2.5 Atmospheric Climate Monitoring | 0.5 | 0.1 g kg-1 0.5 g kg-1 1 g kg-1 0.5 |
0.01 g kg-1 0.05 g kg-1 0.1 g kg-1 0.5 |
10 km 100 km 500 km 0.5 |
60 min 60 min 3 h 0.5 |
6 h 24 h 30 d 0.5 |
Global | firm | 2025-04-11 | GCOS-245: The 2022 ECVs Requirements (GCOS-245) | Requirements for uncertainty are specified at 2-sigma. | Goal for temporal resolution sub-hourly |