The NOAA/ESRL/GML CCGG cooperative air sampling network effort began in 1967 at Niwot Ridge, Colorado. Today, the network is an international effort which includes regular discrete samples from the NOAA ESRL/GML baseline observatories, cooperative fixed sites, and commercial ships. Air samples are collected approximately weekly from a globally distributed network of sites. Samples are analyzed for CO2, CH4, CO, H2, N2O, and SF6; and by INSTAAR for the stable isotopes of CO2 and CH4 and for many volatile organic compounds (voc) such as ethane (C2H6), ethylene (C2H4) and propane (C3H8). Measurement data are used to identify long-term trends, seasonal variability, and spatial distribution of carbon cycle gases.

Portable Sampling Unit (PSU) Information

Instructions and reference for operation of the Portable Sampling Units.
Automated UnitsManual Units
Automated PSU Instructions Manual PSU Instructions
Automated PSU Quick Reference Manual PSU Quick Reference
Automated PSU LED Messages  
Automated PSU Battery Replacement Manual PSU Battery Replacement

 Documents are in PDF format.