BackForward Variable: Air specific humidity (near surface)

Definition
Full name Air specific humidity (near surface)
Definition Air specific humidity  at a known height  above surface, with the height specified in the metadata. Specific  humidity is the ratio of the mass of water vapour and the mass of moist air.
Measuring Units g/kg Uncertainty Units %
Horizontal Res Units km Vertical Res Units
Stability Units % (Stability /decade)

 

Comment:
Last modified: 2019-10-15
Applied in OSCAR/Space Gap Analysis: No
Classification
  • Domain: Atmosphere
    • Sub-domain: Basic atmospheric
      • Variable: Air specific humidity (near surface)
        • Measured in Layers:
          • Near Surface
  • Cross-cutting themes:

Requirements defined for Air specific humidity (near surface)  (7)

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
722 Air specific humidity (near surface) Near Surface 2.8 Aeronautical Meteorology 1 %
2 %
5 % 		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 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 2023-04-28 GCOS-245: The 2022 ECVs Requirements (GCOS-245) Requirements for uncertainty are specified at 2-sigma. Goal for temporal resolution sub-hourly
252 Air specific humidity (near surface) Near Surface 2.1 Global Numerical Weather Prediction and Real-time Monitoring 2 %
5 %
10 % 		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 %
5 %
10 % 		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
1 Air specific humidity (near surface) Near Surface CLIC (deprecated) 10 %
12 %
20 % 		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 %
1.3 %
2 % 		25 km
50 km
100 km 		3 h
4 h
6 h 		24 h
2 d
3 d 		Global speculative 2007-07-19 AOPC