Parameter Carbon Dioxide (CO 2 ) Carbon Monoxide (CO) Carbon-13/Carbon-12 in Carbon Dioxide (D13C (CO 2 )) Carbon-13/Carbon-12 in Methane (D13C (CH 4 )) Methane (CH 4 ) Molecular Hydrogen (H 2 ) Nitrous Oxide (N 2 O) Oxygen-18/Oxygen-16 in Carbon Dioxide (D18O (CO 2 )) Sulfur Hexafluoride (SF 6 )

Data Type Flask Samples In-Situ Data Flask Samples Flask Samples Flask Samples Flask Samples In-Situ Data Flask Samples Flask Samples In-Situ Data Flask Samples Flask Samples

Data Frequency Discrete Monthly Averages Daily Averages Hourly Averages

Time Span

All - a graph of all available data

Current - this year's data

Last year - previous full year of data

Some - a subset of the available data