Ice cores, CO2 concentration, and climate Fig 1 also shows that carbon dioxide and methane (main greenhouse gases) occur in higher concentrations during warm periods; the two variables, temperature and greenhouse gas concentration, are clearly consistent, yet it is not clear what drives what. The correlation coefficient is 0.81 between CO2 content and apparent temperature, on the whole. During deglaciation the two varied simultaneously, but during times of cooling the CO2 changed after the temperature change, by up to 1000 years. This order of events is not what one would expect from the enhanced greenhouse effect. Finally, Fig 1 shows that high concentrations of dust occur at the same times as the colder periods. The most likely reason is that the ice sheets were more extensive during colder periods, and therefore the sea level lower, thus there would have been more exposed, bare land. www-das.uwyo.edu/~geerts/cwx/notes/chap01/icecore.html
Posted on: Thu, 04 Dec 2014 05:40:05 +0000
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