WMO OSCAR | Details for Variable: Integrated Water Vapour (IWV)

Variable: Integrated Water Vapour (IWV)

Definition

Full name	Integrated Water Vapour (IWV)
Definition	Total amount of water vapour present in a vertical atmospheric column.
Measuring Units	kg.m^-2	Uncertainty Units	kg.m^-2
Horizontal Res Units	km	Vertical Res Units
Stability Units	kg.m^-2 (Stability /decade)

Comment:	Taking into account the density of liquid water, the IWV expressed in kg/m2 is equivalent to the Total Precipitable Water (TPW) expressed in mm of liquid water. Strictly speaking, however, not all the water vapour is actually precipitable.
Last modified:
Applied in OSCAR/Space Gap Analysis:	Yes

Classification

Domain: Atmosphere
- Sub-domain: Basic atmospheric
  - Variable: Integrated Water Vapour (IWV)
    - Measured in Layers:
      - TC

Cross-cutting themes:

Earth System Application Categories and its related Application Areas:
- 2. Atmospheric Applications
- 2. Atmospheric Applications
- 2. Atmospheric Applications
- 2. Atmospheric Applications
Unknown:
- Climate-AOPC (deprecated)

Requirements defined for Integrated Water Vapour (IWV) (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	Stability / decade	Hor Res	Obs Cyc	Timeliness	Coverage	Conf Level	Val Date	Source	General Comment
114	Integrated Water Vapour (IWV)	TC	Climate-AOPC (deprecated)		1 kg.m^-2 1.4 kg.m^-2 3 kg.m^-2		50 km 100 km 200 km	3 h 4 h 6 h	7 d 14 d 60 d	Global	firm	2007-07-19	AOPC
304	Integrated Water Vapour (IWV)	TC	2.1 Global Numerical Weather Prediction and Real-time Monitoring		1 kg.m^-2 2 kg.m^-2 5 kg.m^-2		15 km 50 km 250 km	60 min 6 h 12 h	6 min 30 min 6 h	Global	firm	2009-02-10	John Eyre
380	Integrated Water Vapour (IWV)	TC	2.2 High-Resolution Numerical Weather Prediction		1 kg.m^-2 2 kg.m^-2 5 kg.m^-2		0.5 km 5 km 20 km	15 min 60 min 6 h	15 min 30 min 2 h	Global	firm	2010-02-01	T Montmerle
449	Integrated Water Vapour (IWV)	TC	2.3 Nowcasting / Very Short-Range Forecasting		1 kg.m^-2 2 kg.m^-2 5 kg.m^-2		5 km 10 km 50 km	15 min 30 min 60 min	5 min 10 min 30 min	Global	firm	2013-04-03	P. Ambrosetti
817	Integrated Water Vapour (IWV)	TC	2.5 Atmospheric Climate Monitoring	0.5	0.1 kg.m^-2 0.5 kg.m^-2 1 kg.m^-2 0.5	0.1 kg.m^-2 0.2 kg.m^-2 0.5 kg.m^-2 0.5	25 km 250 km 1000 km 0.5	12 min 60 min 24 h 0.5	24 h 5 d 30 d 0.5	Global	firm	2023-04-27	GCOS-245: The 2022 ECVs Requirements (GCOS-245)	Requirements for uncertainty are specified at 2-sigma.
115	Integrated Water Vapour (IWV)	TrC	Climate-AOPC (deprecated)		1 kg.m^-2 1.4 kg.m^-2 3 kg.m^-2		10 km 25 km 200 km	3 h 4 h 6 h	7 d 14 d 60 d	Global	reasonable	2007-07-19	AOPC