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Hydrogen (H₂)

Historical Records from Ice Cores

• Deuterium Record from Dome C, Antarctica

Continuous Measurements

• Advanced Global Atmospheric Gases Experiment (AGAGE, Prinn et al.)

Flask Measurements

• CSIRO GASLAB Network (Steele et al.)
• Measurements from Niwot Ridge, Colorado and Montana de Oro, California (Tyler)

Aircraft Measurements

• Atmospheric Hydrogen Mixing Ratios from the NOAA GMD Carbon Cycle Cooperative Global Air Sampling Network, 1988-2005 (Novelli)