Continuous Atmospheric Greenhouse Gas Measurements at Global Background Sites

1973 to present continuous in-situ measurements of CO2, CH4, and CO from four global background observatories operated by NOAA's Earth System Research Laboratory. The dataset tracks baseline levels, trends, and variability of key climate-forcing gases. It is maintained as part of the Global Greenhouse Gas Reference Network.

Use Cases

• Model global CO2 and CH4 emission fluxes by assimilating long-term concentration trends from Barrow, Mauna Loa, Samoa, and South Pole sites.
• Analyze seasonal and interannual variability in background CO levels as an indicator of distant pollution transport.
• Calibrate remote sensing instruments by comparing satellite retrievals against the WMO calibration scales maintained by this network.
• Detect long-term trends and potential climate 'surprises' from the multi-decadal CO2 record starting in 1973.

Strengths

• Multi-decadal temporal coverage from 1973 to present for CO2.
• Measurements from four geographically distinct global background sites ensuring remote air sampling.
• Data adheres to World Meteorological Organization international calibration scales for key gases.

Limitations

• Spatial coverage is limited to four fixed observatory sites, lacking dense regional data.
• The subset CO2 data archived with DOIs is currently only available through 2016.
• Unknown total row count and specific file structure details for the full enhanced dataset.

Provenance

Source

NOAA Earth System Research Laboratory (ESRL) Carbon Cycle and Greenhouse Gases Group.

Collection Method

Continuous in-situ measurements at staffed atmospheric baseline observatories.

Time Range

1973 - Present

Freshness

null

Geography

Four global background sites: Barrow (Alaska), Mauna Loa (Hawaii), American Samoa, South Pole (Antarctica).