Atmospheric Carbon Dioxide Mixing Ratios from the NOAA CMDL Carbon Cycle
Cooperative Global Air Sampling Network (2009)
T. Conway and P. Tans
DOI: 10.3334/CDIAC/atg.ndp005
The National Oceanic and Atmospheric Administration's Climate Monitoring and Diagnostics
Laboratory (NOAA/CMDL) has measured CO2 in air samples collected weekly at a
global network of sites since the late 1960s. Atmospheric CO2
mixing ratios reported in these files were measured by a nondispersive infrared
absorption technique in air samples collected in glass flasks. All CMDL flask samples
are measured relative to standards traceable to the World Meteorological Organization (WMO)
CO2 mole fraction scale. These measurements constitute the most geographically
extensive, carefully calibrated, internally consistent atmospheric CO2 data set
available and are essential for studies aimed at better understanding the global
carbon cycle budget.
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