Mathematics – Logic
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.u22a..05j&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #U22A-05
Mathematics
Logic
0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707)
Scientific paper
Results from GCM simulations using boundary conditions (solar forcing, landmass position) for the Proterozoic Era (Palaeoproterozoic, Mesoproterozoic, Neoproterozoic) are presented. The primary purpose of this presentation is to determine from model simulations when high obliquity conditions are consistent or inconsistent with the implied climatic conditions from geologic rock record. The results suggests that high obliquity is a viable solution for most of the Proterozoic Era with the exception of the extreme events at the end of the Neoproterozoic when glacial deposits may have existed in high latitudes (>40 degrees). However, the high latitude glacial deposits have the largest uncertainties. A number of studies have suggested that the proposed mechanisms for restoring obliquity to the present day values at the end of the Neoproterozoic are not viable. However, the overall agreement with the implied climate conditions during the Proterozoic Era makes it difficult to dismiss the High Obliquity Hypothesis.
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