Suggests that plants have achieved an optimum response to rising CO2 levels in the atmosphere
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
Why Has a Drop in Global CO2 Emissions Not Caused CO2 Levels in the Atmosphere to Stabilize?
Note: Readers have asked why there has been no stabilization in the measured levels of the greenhouse gas carbon dioxide in the atmosphere when reported emissions of CO2 have fallen. Scripps CO2 Group Director Ralph Keeling gave this response:
Comment on Recent Record-Breaking CO2 Concentrations
Levels exceeded 409 parts per million for the first time in recorded history this month
Measurement Note: An Adjustment to the Record
On Nov. 5, 2015, we made an adjustment to the Scripps Mauna Loa CO2 record that has the effect of increasing concentrations we have reported since April 2015
Is This the Last Year Below 400?
Leader of Keeling Curve measurement says temporary bump from El Niño could push atmospheric CO2 levels above symbolic threshold for good
What Does This Number Mean?
Repost of April 2013 entry The Mauna Loa carbon dioxide (CO2) record, also known as the “Keeling Curve,” is the world’s longest unbroken record of atmospheric carbon dioxide concentrations.