WMO OSCAR | Details for Variable: CH4 column average dry air mixing ratio

Variable: CH4 column average dry air mixing ratio

Definition

Full name	CH4 column average dry air mixing ratio
Definition	2D Column integrated number of molecules of the target gas (CH4, methane) divided by that of dry air expressed in mole fraction
Measuring Units	nmol/mol	Uncertainty Units	ppb
Horizontal Res Units	km	Vertical Res Units
Stability Units	ppb (Stability /decade)

Comment:
Last modified:	2025-04-11
Applied in OSCAR/Space Gap Analysis:	No

Classification

Domain: Atmosphere
- Sub-domain: Atmospheric chemistry
  - Variable: CH4 column average dry air mixing ratio
    - 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
Unknown:
- Forecasting Atmospheric Composition

Requirements defined for CH4 column average dry air mixing ratio (4)

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
884	CH4 column average dry air mixing ratio	TC	Forecasting Atmospheric Composition		7 ppb 10 ppb 20 ppb	1 ppb 2 ppb 5 ppb	0.3 km 1 km 10 km	60 min 12 h 3 d	24 h 7 d 14 d	Global	firm	2021-12-09	GAW Expert Team on Atmospheric Composition Network Design and Evolution	Uncertainties are provided as 2 sigma. They represent the sum of random and systematic error. ESA URD-GHGCCI-v2016, TCCON
885	CH4 column average dry air mixing ratio	TC	2.6 Atmospheric Composition Forecasting and Monitoring		7 ppb 10 ppb 20 ppb	1 ppb 2 ppb 5 ppb	0.3 km 1 km 10 km	60 min 12 h 3 d	24 h 7 d 14 d	Global	firm	2021-12-09	GAW Expert Team on Atmospheric Composition Network Design and Evolution	Uncertainties are provided as 2 sigma. They represent the sum of random and systematic error. ESA URD-GHGCCI-v2016, TCCON
886	CH4 column average dry air mixing ratio	TC	2.7 Atmospheric Composition Information Services in Urban and Populated Areas		7 ppb 10 ppb 20 ppb	1 ppb 2 ppb 5 ppb	0.1 km 2 km 4 km	60 min 12 h 3 d	24 h 7 d 14 d	Global	firm	2021-12-09	GAW Expert Team on Atmospheric Composition Network Design and Evolution	Uncertainties are provided as 2 sigma. They represent the sum of random and systematic error. ESA URD-GHGCCI-v2016, TCCON
887	CH4 column average dry air mixing ratio		2.5 Atmospheric Climate Monitoring	0.5	7 ppb 10 ppb 20 ppb 0.5	1 ppb 2 ppb 4 ppb 0.5	0.3 km 1 km 10 km 0.5	60 min 12 h 3 d 0.5	24 h 7 d 14 d 0.5	Global	firm	2025-04-11	GCOS-245: The 2022 ECVs Requirements (GCOS-245)