BackForward Variable: (13)CH4 delta

Full name (13)CH4 delta
Definition 3D field of Delta C-13 in CH4 (Methane) (isotopic signature). Isotopic ratio, expressed as deviations from an agreed-upon international reference measurement standard (which defines the corresponding isotope scales) using the delta notation: δ = (Rsample/Rreference – 1), with R = [rare isotope]/[abundant isotope].
Measuring Units Uncertainty Units
Horizontal Res Units km Vertical Res Units km
Stability Units ‰ (Stability /decade)


Comment: See
Last modified: 2022-02-21
Applied in OSCAR/Space Gap Analysis: No
  • Domain: Atmosphere
    • Sub-domain: Atmospheric chemistry
      • Variable: (13)CH4 delta
        • Measured in Layers:
          • MUS
          • UTLS
          • FT
          • PBL
          • Near Surface
          • M
  • Cross-cutting themes:

Requirements defined for (13)CH4 delta  (1)

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 and threshold orange

Id Variable Layer App Area Uncertainty Stability / decade Hor Res Ver Res Obs Cyc Timeliness Coverage Conf Level Val Date Source
943 (13)CH4 delta UTLS
Near Surface
Monitoring Atmospheric Composition 0.01 ‰
0.02 ‰
0.2 ‰
0.01 ‰
0.02 ‰
0.2 ‰
500 km
1000 km
2000 km
0.5 km
1 km
3 km
60 min
24 h
7 d
24 h
28 d
168 d
Global firm 2022-02-21 GAW Expert Team on Atmospheric Composition Network Design and Evolution