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Video: How Scientists Measure Carbon Dioxide

In Keeling Curve History, Measurement Notes, Videos by Rob Monroe

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 …

Note on Pause in Daily Readings

In Daily Measurements, Measurement Notes by Rob Monroe

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 …

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What Does This Number Mean?

In Measurement Notes by Rob Monroe

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.  

A note on recent readings

In Measurement Notes by Rob Monroe

In response to a recent reader comment about wide fluctuations in CO2 readings at Mauna Loa, Ralph Keeling and Stephen Walker of the Scripps CO2 Group gave the following answer: It’s fairly normal, especially in the summer time, to see strong afternoon “dips” in the CO2 concentration.  The dips are generally caused by upslope winds that that are depleted in …

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How are CO2 Data Processed?

In Measurement Notes by Rob Monroe

Scientists make CO2 measurements in remote locations to obtain air that is representative of a large volume of Earth’s atmosphere and relatively free from local influences that could skew readings.

Instrument status

In Measurement Notes by Rob Monroe

[instrumentstatuslist] May 10 Comment: NOAA has reported 400.03 for yesterday, but Scripps has reported 399.73.   The difference is similar to other differences we have reported.   The difference partly reflects time zone differences.  NOAA uses UTC, whereas we use local time in Hawaii to define the start and stop of a given day.  Changing to UTC excludes the lower CO2 period …