In-Situ Measurement Techniques

The in-situ trace gas measurements at the stations Zugspitze, Wank and Garmisch-Partenkirchen are based on the following measurement principles:

O₃	UV absorption at 254 nm
CO	Vacuum UV fluorescence Non-dispersive infrared absorption
NO, NO_y	Chemiluminesence, Molybdenum converter
Meteorological parameters	standard instrumentation

The following principles are employed for the in-situ measurement of trace gases at the GAW station Cape Point.:

CO₂	Non-dispersive infrared absorption (NDIR)
CH₄	Gas chromatography with flame ionisation detector (FID)
N₂O, CFCs	Gas chromatography with electron capture detector (ECD)
CO	Gas chromatography with HgO reduction detector
O₃	UV absorption at 254 nm
²²²Rn	Alpha counting
Meteorological parameters	standard instrumentation