Global Monitoring Division

The NOAA/ESRL/GMD 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 4 NOAA ESRL/GMD baseline observatories, cooperative fixed sites, and commercial ships. Air samples are collected approximately weekly from a globally distributed network of sites. Samples are analyzed in Boulder by CCGG for CO₂, CH₄, CO, H₂, N₂O, and SF₆; and by INSTAAR for the stable isotopes of CO₂ and CH₄. Measurement data are used to identify long-term trends, seasonal variability, and spatial distribution of carbon cycle gases.

• Site Map
  World map showing the NOAA ESRL/GMD CCGG Cooperative Air Sampling Network.
• Site Information Summary
  Table summarizing current network site information.
  
• Flask Analysis Instrumentation
  Photo of the equipment used for measuring the amount of trace gases in flask air samples.
• Flask Analysis System Schematic
  Schematic diagram of the flask analysis instrumentations.
• Portable Sampling Unit (PSU) Information
• Flask Sampling Newsletters