Segalstad versus Callendar

[Jostemikk]

Ivrig klimadebattant Gail Combs minnet meg på en sak angående det nivået de satt for CO2 før den industrielle alderen satte inn. Det dreier seg om iskjernetolkingene fra Arktis, og en publikasjon av Segalstad.

Det er rimelig nærme en beskyldning om triksing Segalstad kommer med overfor Callendar. Gjør oppmerksom på at dette er min tolking av det han skriver. Andre kan tolke dette annerledes, men det forandrer ikke at dette i høyeste grad er interessant. Hvis denne saken er tatt opp tidligere, så beklager jeg at det har gått i glemmeboka.

Carbon cycle modelling and the residence time of natural and anthropogenic atmospheric CO2: on the construction of the "Greenhouse Effect Global Warming" dogma. Tom V. Segalstad

In order to show that recent atmospheric CO2 levels have risen due to Man's burning of fossil fuel, it was necessary to show a significant level increase above pre-industrial CO2 levels. We saw how Callendar was able to set a baseline of about 290 ppmv by rejecting values deviating more than 10% from his desired value.

It was believed that snow accumulating on ice sheets would preserve the contemporaneous atmosphere trapped between snowflakes during snowfalls, so that the CO2 content of air inclusions in cores from ice sheets should reveal paleoatmospheric CO2 levels. Jaworowski et al. (1992 b) compiled all such CO2 data available, finding that CO2 levels ranged from 140 to 7,400 ppmv. However, such paleoatmospheric CO2 levels published after 1985 were never reported to be higher than 330 ppmv. Analyses reported in 1982 (Neftel at al., 1982) from the more than 2,000 m deep Byrd ice core (Antarctica), showing unsystematic values from about 190 to 420 ppmv, were falsely "filtered" when the alleged same data showed a rising trend from about 190 ppmv at 35,000 years ago to about 290 ppmv (Callendar's pre-industrial baseline) at 4,000 years ago when re-reported in 1988 (Neftel et al., 1988); shown by Jaworowski et al. (1992 b) in their Fig. 5

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