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Isotope rations DO NOT PROVE atmospheric CO2 increase is due to man’s CO2 (Suess Effect)

Dusting for Fingerprints in the Holocene

Examples of similar 13c ratios from before man burned fossil fuels shows this ratio is NOT evidence of CO2 being of man’s origin:

Fig 2) 13C depletion during Holocene Climatic Optimum in the Thar Desert of Northwest India (Enzel et al., 1999).

Fig 3) 13C depletion during Preboreal to Boreal in western Poland (Apolinarska, 2009).

Fig 4) 13C depletion during last interglacial in the Indian Ocean (Banakar, 2005).

Fig 5) 13C rise and depletion across the Little Ice Age in the Yucatan compared to recent 13C depletion in the Coral Sea.

For details see: https://wattsupwiththat.com/2012/03/28/dusting-for-fingerprints-in-the-holocene/

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This is from:  https://wattsupwiththat.com/2012/03/28/dusting-for-fingerprints-in-the-holocene/

Measurements of δ13C depletion have often been cited as anthropogenic “fingerprints,” proving human culpability for the rise in atmospheric CO2 over the last 200 years or so…

While δ13C depletion certainly could be evidence of the Suess Effect, it is not a unique solution; therefore, not a “fingerprint.”

Examples of geologically recent δ13C depletion not of anthropogenic origin…

Fig 2) δ13C depletion during Holocene Climatic Optimum in the Thar Desert of Northwest India (Enzel et al., 1999).

Fig 4) δ13C depletion during last interglacial in the Indian Ocean (Banakar, 2005)

δ13C depletions were associated with warming events ~5,000 years ago in India, ~9,100 years ago in Poland and ~150,000 years ago in the Indian Ocean. It appears to me that δ13C depletion has been a fairly common occurrence during periods of “global warming.” It also appears that δ13C increases have occurred during periods of global cooling…

The red curve in Figure 5 is the Flinders Reef δ13C that was cited as “Human Fingerprint #1” in Skeptical Science’s The Scientific Guide to Global Warming Skepticism.  The rate of δ13C depletion is quite similar to that of the lacustrine deposit on the Yucatan.  The Flinders Reef data do not extend back before the Little Ice Age; so there is no way to tell  if the modern depletion is an anomaly, if the δ13C was anomalously elevated during the 18th and 19th centuries and the depletion is simply a return to the norm or if δ13C is cyclical.

Is it possible that Skeptical Science’s “Human Fingerprint #1” is not due to the Suess Effect? Could it be related to the warm-up from the Little Ice Age?

Above section is from:  https://wattsupwiththat.com/2012/03/28/dusting-for-fingerprints-in-the-holocene/