A correspondent recently asked Keeling Curve researchers to settle a family disagreement about the cause of rising CO2 levels in the atmosphere and whether the current trend is natural or human-caused. Scripps geochemist Ralph Keeling provided the following answer:
Peak carbon dioxide levels surpass 411 parts per million for May
April monthly average exceeds 410 parts per million for the first time in recorded history
In honor of the 60th anniversary of the Keeling Curve, Ralph Keeling of the Scripps CO2 Program shows how scientists make carbon dioxide measurements and gives a guided tour of the original instruments his father, Charles David Keeling, developed to start the famous record known as the Keeling Curve. In 2018, carbon dioxide levels are expected to exceed 410 parts …
Suggests that plants have achieved an optimum response to rising CO2 levels in the atmosphere
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.
A hurricane bearing down on Hawaii prompted operators to shut down CO2 monitoring equipment at Mauna Loa Observatory on the Big Island.
A failed disk that had prevented the reporting of daily readings was replaced on June 14 and the system is now running normally.
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 …
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: