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- aggregation classification "A1".
- aggregation creator B175356.
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- aggregation date "2010".
- aggregation format "application/pdf".
- aggregation hasFormat 1245763.bibtex.
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- aggregation isPartOf urn:issn:0027-8424.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Biology and Life Sciences".
- aggregation title "Polar front shift and atmospheric CO2 during the glacial maximum of the Early Paleozoic Icehouse".
- aggregation abstract "Our new data address the paradox of Late Ordovician glaciation under supposedly high pCO(2) (8 to 22x PAL: preindustrial atmospheric level). The paleobiogeographical distribution of chitinozoan ("mixed layer") marine zooplankton biotopes for the Hirnantian glacial maximum (440 Ma) are reconstructed and compared to those from the Sandbian (460 Ma): They demonstrate a steeper latitudinal temperature gradient and an equatorwards shift of the Polar Front through time from 55 degrees-70 degrees S to similar to 40 degrees S. These changes are comparable to those during Pleistocene interglacial-glacial cycles. In comparison with the Pleistocene, we hypothesize a significant decline in mean global temperature from the Sandbian to Hirnantian, proportional with a fall in pCO2 from a modeled Sandbian level of similar to 8x PAL to similar to 5x PAL during the Hirnantian. Our data suggest that a compression of midlatitudinal biotopes and ecospace in response to the developing glaciation was a likely cause of the end-Ordovician mass extinction.".
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- aggregation endPage "14986".
- aggregation issue "34".
- aggregation startPage "14983".
- aggregation volume "107".
- aggregation aggregates 1268853.
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