Suggests that plants have achieved an optimum response to rising CO2 levels in the atmosphere Continue reading Rising CO2 Leading to Changes in Land Plant Photosynthesis
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. Continue reading Note on Reaching the Annual Low Point
A hurricane bearing down on Hawaii prompted operators to shut down CO2 monitoring equipment at Mauna Loa Observatory on the Big Island. Continue reading Brief Reprieve from 400 PPM Era May Be Thanks to a Hurricane
A failed disk that had prevented the reporting of daily readings was replaced on June 14 and the system is now running normally. Continue reading Daily Readings Have Been Restored
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 taking air data, but we will need to assess the stability of calibration once the instrument is working completely again. A replacement was shipped last week, so it should be up again shortly.
– Robert Monroe
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: Continue reading Why Has a Drop in Global CO2 Emissions Not Caused CO2 Levels in the Atmosphere to Stabilize?
Levels exceeded 409 parts per million for the first time in recorded history this month Continue reading Comment on Recent Record-Breaking CO2 Concentrations
Innovative and easy-to-use visualizations depicting aspects of climate change are available through the Keeling Curve website. Continue reading New Climate Visualization Links Added to Keeling Curve Site
CO2 levels increasing at a faster rate than before Continue reading Record Annual Increase of Carbon Dioxide Observed for 2015
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 Continue reading Measurement Note: An Adjustment to the Record