University of California Press

Figure 5.

$Shown are the slopes (x axis) and intercepts (y axis) of the linear regression between the stations’ calibration measurements and the Empa reference standard. The green and yellow areas cover the range of slope-intercept combinations for a maximum bias of 2 nmol mol-1 (WMO/GAW compatibility goal) and 5 nmol mol-1 (extended compatibility goal) for the mole fraction range of 50–200 nmol mol-1 CO. The different measurement techniques employed were: NDIR: non-dispersive infrared detection, HgO: gas chromatography with hot mercuric oxide detector, VURF: Vacuum UV Resonance Fluorescence, QCL: Quantum Cascade Laser Spectroscopy, FID: gas chromatography with flame ionization detector, CRDS: Cavity Ring Down Spectroscopy, FTIR: Fourier Transform Infrared Spectroscopy.$

Results of CO audits conducted by WCC-Empa between 2008 and 2014.

Shown are the slopes (x axis) and intercepts (y axis) of the linear regression between the stations’ calibration measurements and the Empa reference standard. The green and yellow areas cover the range of slope-intercept combinations for a maximum bias of 2 nmol mol^-1 (WMO/GAW compatibility goal) and 5 nmol mol^-1 (extended compatibility goal) for the mole fraction range of 50–200 nmol mol^-1 CO. The different measurement techniques employed were: NDIR: non-dispersive infrared detection, HgO: gas chromatography with hot mercuric oxide detector, VURF: Vacuum UV Resonance Fluorescence, QCL: Quantum Cascade Laser Spectroscopy, FID: gas chromatography with flame ionization detector, CRDS: Cavity Ring Down Spectroscopy, FTIR: Fourier Transform Infrared Spectroscopy.

This Feature Is Available To Subscribers Only