Tomer D. Tamarkin

Putting the false UN IPCC 13C/12C isotope argument to bed forever

Roy Spencer, PhD. (attached pdf.) and Murry Salby, PhD. (video link and text excerpt below), Tom Segalstad, PhD., (excerpts and links below and paper attached as pdf) and Edwin X Berry, PhD., (excerpt and link below and pdf attached) and Werner Stumm, PhD., have explained the problems with IPCC claimed carbon isotope "proof.” Key excerpts and links to these works are presented here. Brief bios of these scientists are below.

At this link is an excellent video lecture by Professor Murry Salby, PhD. The problem with the isotope "proof” is explained beginning at the 25-minute mark.

he following is quoted from Professor Salby’s 2012 book, "The upward trend of CO2 is commonly ascribed to emission by human activities. Support for this interpretation comes from isotopes of carbon. Carbon 13, like carbon 12, is stable. It represents about 1% of the isotopic composition of CO2. However, its concentration varies between reservoirs of carbon. Vegetation and ancestral carbon, fossil fuel, are slightly leaner in 13C than is the atmosphere.” (6)

(6) Reflecting increased efficiency of photosynthesis with the lighter form of carbon.

"Proxy evidence of δ13C is more variable than that of rCO2 [atmospheric mixing ratio of CO2]. It also has little overlap with the more recent instrumental record (crosses). Nevertheless, reconstructed δ13C decreased over the last two centuries, mirroring the contemporaneous increase of rCO2.”

"The decrease of δ13C, together with the increase of rCO2, reflects the addition of CO2 that is 13C lean. This feature is consistent with the combustion of fossil fuel, as well as biomass destruction. It is equally consistent, however, with the decomposition of organic matter derived from vegetation. Thus, associating the decrease of δ13C to the combustion of fossil fuel requires the exclusion of other sources that are 13C lean. In particular, it relies on CO2 emission from the ocean, which overshadows other sources of CO2 (Sec. 17.3), having the same isotopic composition as the atmosphere (which would then be left unchanged). Only then can the decrease of δ13C be isolated to continental sources, which are weaker and, in particular, to the combustion of fossil fuel, which is an order of magnitude weaker. Yet, the isotopic composition of marine organic matter is influenced by a variety of biological and environmental factors (Francois et al., 1993; Goericke et al., 1994). Through those factors, δ13C in the upper ocean varies significantly. Along with transport from the deep ocean, which is likewise uncertain, they leave the magnitude and composition of ocean emission poorly understood (Sec. 1.6.2).” ~ Salby, Murry. Physics of the Atmosphere and Climate, page 24. 2012. Cambridge University Press. https://climatecite.com/physics-of-the-atmosphere-and-climate-pt-1/

Complete article at: https://climatecite.com/putting-the-false-un-ipcc-13c-12c-isotope-argument-to-bed-forever/

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