28-October-2008, 03:01 AM
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Established Member
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Join Date: Mar 2008
Location: England
Posts: 150
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Quote:
Originally Posted by William
The following is strong support for a mechanism such as solar magnetic cycle changes which can modulate planetary temperature. Note the mechanism in question is capable of cooling the planet in all climate conditions.
http://dx.doi.org/10.1016/j.palaeo.2006.08.008 |
Again you are citing a paper that does not support your claims, as you were told at RealClimate:
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Actually, there are 5 periods they indicate as “icehouse”, the first much briefer than the others, and the second and third separated only by a relatively short intermediate (i.e. neither “icehouse” nor “greenhouse”) period. To my eye, there’s no obvious periodicity. They do not comment on the origin of this long-term variation. They prefer an interpretation of the rhythmites in terms of millenial-scale temperature changes, but are pretty tentative about it - there is an alternative (”diagenetic” processes following deposition). They do say that if their interpretation is correct, “an external driver such as solar forcing” (or an 1800 year Earth-Moon tidal cycle) is probably responsible, but admit that “Presently it is not clear how very small perturbations in solar radiation could be amplified within the climate system to generate the observed significant climate changes.” All in all, an interesting paper appropriately hedged with “ifs” and “buts”, but by no means paradigm-shattering.
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http://www.realclimate.org/?comments...#comment-83065
Quote:
Likewise, Shaviv’s supposed correlation of the CRF with the Phanerozoic temperature record of Veizer’s is even more questionable in the light of Veizer’s reinterpretation of some of the paleotemperature data. The apparent “correlation” of supposed CRF with temperature is certainly lost in the revision of the temperature data which now matches better with the CO2 record:
Came RE, Eiler JM, Veizer J, et al. (2007) Coupling of surface temperatures and atmospheric CO2 concentrations during the Palaeozoic era Nature 449, 198-201.
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http://www.realclimate.org/?comments...#comment-83162
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