Monthly and weekly in-situ CO2 data sets taken at Mauna Loa, Observatory, Hawaii: Latitude 19.5°N Longitude 155.6°W Elevation 3397m.
Measurements of atmospheric CO2 concentration in our program began in 1957 at La Jolla, California and at the South Pole, and in 1958 at Mauna Loa Observatory. These measurements were gradually extended during the 1960's and 1970's to comprise sampling at an array of stations from the Arctic to Antarctica.
The primary (in situ) record from Mauna Loa is based on measurements made with an analyzer at the site. At all other stations, the records are based on flask samples returned to our La Jolla laboratory for analysis. Flasks have also been redundantly collected at Mauna Loa. Isotopic measurements on flask samples of the 13C/12C and 18O/16O ratios of CO2, which we began in 1978, have gradually been expanded to include all stations where we measure the CO2 concentration.
Atmospheric CO2 concentrations (ppm) derived from flask air samples taken aboard aircraft at 700, 500 and 300 hPa over North Pacific, Alaska, and Arctic Ocean from April 1958 through December 1961, spanning 11° 54'N to 86° 18'N latitude, and 105° 18'W to 166° 12'W longitude.
Atmospheric CO2 record based on ice core data before 1958, (Ethridge et. al., 1996; MacFarling Meure et al., 2006) and yearly averages of direct observations from Mauna Loa and the South Pole after and including 1958 (from Scripps CO2 Program).