Calibration Scales used for Round Robin #6

A World Meteorological Organization (WMO) Central Calibration Laboratory (CCL) is responsible for maintaining and distributing the WMO Mole Fraction scale for a specified gas in air. NOAA Earth System Research Laboratory (ESRL) Global Monitoring Division (GMD) is the WMO CCL for CO2, CH4, N2O, SF6, and CO. Max Planck Institute for Biogeochemistry (MPI-BGC) laboratory in Jena, Germany is the CCL for H2 and for the stable isotopes of CO2 (δ13C and δ18O).

The following table summarizes the calibration scales used to assign values to the current WMO Round Robin cylinders. Please Note: For these experiments, H2 values have been assigned to the WMO Round Robin cylinders by NOAA, the stable isotopes of CO2 values have been assigned by the University of Colorado (CU), Institute of Arctic and Alpine Research (INSTAAR), Stable Isotope Laboratory (SIL), and O2/N2 values have been assigned by the National Center for Atmospheric Research (NCAR).