BackForward Variable: Specific humidity

Definition
Full name Specific humidity
Definition 3D field of the specific humidity in the atmosphere. The specific humidity is the ratio between the mass of water vapour and the mass of moist air.
Measuring Units g kg-1 Uncertainty Units g kg-1
Horizontal Res Units km Vertical Res Units km
Stability Units g kg-1 (Stability /decade)

 

Comment:
Last modified: 2024-07-10
Applied in OSCAR/Space Gap Analysis: Yes
Classification
  • Domain: Atmosphere
    • Sub-domain: Basic atmospheric
      • Variable: Specific humidity
        • Measured in Layers:
          • MUS
          • UTLS
          • FT
          • PBL
          • M
  • Cross-cutting themes:

Requirements defined for Specific humidity  (12)

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
21 Specific humidity PBL 2.8 Aeronautical Meteorology 5 g kg-1
7 g kg-1
10 g kg-1 		50 km
70 km
100 km 		0.15 km
0.3 km
0.6 km 		60 min
90 min
3 h 		60 min
90 min
2 h 		Global firm 2014-03-27 J van der Meulen
110 Specific humidity MUS
M 		Climate-AOPC (deprecated) 2 g kg-1
5 g kg-1
20 g kg-1 		50 km
100 km
200 km 		2 km
3 km
5 km 		3 h
4 h
6 h 		7 d
14 d
60 d 		Global firm 2007-07-19 AOPC Signal sizes in section 3.3.7 of N. Nicholls et al. 1996 Observed Climate Variability and Change. Chapter 2 of Climate Change 1995 (IPCC Second Assessment). support this need.
111 Specific humidity FT Climate-AOPC (deprecated) 2 g kg-1
5 g kg-1
20 g kg-1 		20 km
50 km
100 km 		0.1 km
0.5 km
2 km 		3 h
4 h
6 h 		7 d
14 d
60 d 		Global firm 2007-07-19 AOPC Signal sizes in section 3.3.7 of N. Nicholls et al. 1996 Observed Climate Variability and Change. Chapter 2 of Climate Change 1995 (IPCC Second Assessment). support this need.
112 Specific humidity UTLS Climate-AOPC (deprecated) 2 g kg-1
5 g kg-1
20 g kg-1 		50 km
100 km
200 km 		2 km
2.5 km
3 km 		3 h
4 h
6 h 		7 d
14 d
60 d 		Global firm 2007-07-19 AOPC Signal sizes in section 3.3.7 of N. Nicholls et al. 1996 Observed Climate Variability and Change. Chapter 2 of Climate Change 1995 (IPCC Second Assessment). support this need.
113 Specific humidity PBL Climate-AOPC (deprecated) 2 g kg-1
4 g kg-1
15 g kg-1 		10 km
15 km
25 km 		3 h
4 h
6 h 		7 d
14 d
60 d 		Global firm 2007-07-19 AOPC Signal sizes in section 3.3.7 of N. Nicholls et al. 1996 Observed Climate Variability and Change. Chapter 2 of Climate Change 1995 (IPCC Second Assessment). support this need.
192 Specific humidity MUS
UTLS
FT
PBL
M 		Atmospheric Chemistry (deprecated) 5 g kg-1
8 g kg-1
20 g kg-1 		50 km
100 km
500 km 		1 km
1.7 km
5 km 		12 h
24 h
3 d 		3 d
4 d
7 d 		Global firm 2002-05-24 GAW Report No. 159 Atmos dynamics, Rad clim, Ozone chem, 5% RH
302 Specific humidity FT 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 		0.3 km
0.5 km
1 km 		60 min
6 h
12 h 		6 min
30 min
6 h 		Global tentative 2020-03-30 Masahiro Kazumori (PoC GNWP) Uncertainty: 5% in RH
303 Specific humidity PBL 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 		0.3 km
1 km
3 km 		60 min
6 h
12 h 		6 min
30 min
6 h 		Global firm 2009-02-10 John Eyre Uncertainty: 5% in RH
378 Specific humidity FT 2.2 High-Resolution Numerical Weather Prediction 2 g kg-1
5 g kg-1
10 g kg-1 		2 km
10 km
30 km 		0.3 km
0.4 km
1 km 		15 min
60 min
6 h 		15 min
30 min
2 h 		Global firm 2011-07-29 T Montmerle
379 Specific humidity PBL 2.2 High-Resolution Numerical Weather Prediction 2 g kg-1
5 g kg-1
10 g kg-1 		0.5 km
5 km
20 km 		0.1 km
0.2 km
1 km 		15 min
60 min
6 h 		15 min
30 min
2 h 		Global firm 2011-07-29 T Montmerle
448 Specific humidity FT 2.3 Nowcasting / Very Short-Range Forecasting 5 g kg-1
8 g kg-1
20 g kg-1 		5 km
15 km
50 km 		0.1 km
0.5 km
2 km 		15 min
30 min
60 min 		10 min
20 min
60 min 		Global firm 2013-04-03 P. Ambrosetti Accuracy 10% in RH
704 Specific humidity PBL 2.3 Nowcasting / Very Short-Range Forecasting 2 g kg-1
5 g kg-1
10 g kg-1 		5 km
10 km
50 km 		0.1 km
0.3 km
1 km 		5 min
10 min
60 min 		5 min
10 min
60 min 		Global reasonable 2013-04-25 P. Ambrosetti For derivation of atmospheric stability index Accuracy 5% in RH