This courtesy of Jim Church:

Repost Joseph Fournier, LinkedIn

From the early 19th century to the middle of the 20th, the gold standard for measuring atmospheric CO2 concentrations was chemical titration.

This titration method was replaced in 1958 by spectroscopic methods, which now forms the basis of the famous Keeling Curve (https://lnkd.in/gDmdRztF).

Shown here is a comparison of atmospheric CO2 measurements produced by both chemical titration (purple) and by ice core samples (red).

Note the very close agreement in estimates in the early 1920s and in the 1950s, together with the very large disagreement in estimate atmospheric CO2 concentrations in between.

The names associated with the purple curve are the authors from which published their chemical titration results during the first half of the 20th century. These values were obtained from numerous locations scattered across the Northern Hemisphere.

The problem here is self evident.

Chemical titration results are remarkably similar to air temperature trends across the Northern Hemisphere during the first half of the 20th century, while ice core CO2 estimates do not.

Most importantly, historical CO2 measurements using chemical titration methods shows that atmospheric CO2 concentration values are on par with those measured today using spectroscopic methods.

See Greenland's historical air temperature records below to verify that air temperatures were also similar in the 1940s to present day.

The fact that chemical titration records for the Northern Hemisphere are aligned with air temperatures, while ice core samples are not, in my mind represents a serious flaw in mainstream claims that the later is better representative of the dynamically changing atmospheric CO2 composition since the early 19th century to present.

I for one reject answers that can not be questioned and will tend to accept questions without an answer if forced to make a choice between the two.

Here is a detailed white paper that outlines the historical record on the use of chemical titrations in measuring atmospheric CO2 concentrations. Note that the author is highly biased towards chemical titration. Make up your own mind.
https://lnkd.in/gSUYvBhV

Posted by: Timothy Birdnow at 08:04 AM | No Comments | Add Comment
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