On Saturday, Feb. 3, the daily Keeling Curve record was broken when instruments at Mauna Loa detected a carbon dioxide concentration of 426.5 parts per million (ppm). It was the first time in the modern record a daily reading had exceeded 425 ppm, though the annual peak does not typically take place until May. Since then, several daily readings have … Read More
Scripps CO2 Instrument at Mauna Loa Observatory Back in Action
Helicopter delivers photovoltaic rails, electrical conduit, and solar panels to Mauna Loa Observatory. Photo: Scott Prestien/EPC We are happy to report that measurements by the Scripps CO2 program resumed at Mauna Loa Observatory on March 9. The CO2 analyzer is being powered with a solar power/battery system installed by NOAA staff at the Mauna Loa Observatory using helicopter access. The … Read More
Update on CO2 readings commencing at Maunakea
(Above: Ralph Keeling takes an air sample at Maunakea Dec. 21, 2022) The Keeling Curve data stream was interrupted by the eruption of Mauna Loa on Nov. 28. To help close this data gap, scientists at Scripps Institution of Oceanography at UC San Diego worked with partners from NOAA and the Maunakea Observatory partners to install a nearly-identical carbon dioxide … Read More
Another Climate Milestone Falls at Mauna Loa Observatory
Peak carbon dioxide levels surpass 411 parts per million for May
Carbon Dioxide in the Atmosphere Hits Record High Monthly Average
April monthly average exceeds 410 parts per million for the first time in recorded history
Note on Reaching the Annual Low Point
We are now approaching the annual low point in the Mauna Loa CO2 curve, which typically happens around the last week of September but varies slightly from year to year.
Brief Reprieve from 400 PPM Era May Be Thanks to a Hurricane
A hurricane bearing down on Hawaii prompted operators to shut down CO2 monitoring equipment at Mauna Loa Observatory on the Big Island.
Daily Readings Have Been Restored
A failed disk that had prevented the reporting of daily readings was replaced on June 14 and the system is now running normally.
Note on Pause in Daily Readings
Readings of CO2 from Mauna Loa have been unavailable for two weeks. According to technicians with the Scripps CO2 Group, the problem is a disk failure that handles the data buffering, which has broken the data stream and valve switching that impacts daily calibration. The air data are recoverable, because the computer onboard the actual instrument is still working and … Read More
Record Annual Increase of Carbon Dioxide Observed for 2015
CO2 levels increasing at a faster rate than before
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