Modeling late Paleozoic glaciation

Research Article| June 01, 1992 Modeling late Paleozoic glaciation Thomas J. Crowley; Thomas J. Crowley 1Applied Research Corporation, 305 Arguello Drive, College Station, Texas 77840 Search for other works by this author on: GSW Google Scholar Steven K. Baum Steven K. Baum 1Applied Research Corporation, 305 Arguello Drive, College Station, Texas 77840 Search for other works by this author on: GSW Google Scholar Author and Article Information Thomas J. Crowley 1Applied Research Corporation, 305 Arguello Drive, College Station, Texas 77840 Steven K. Baum 1Applied Research Corporation, 305 Arguello Drive, College Station, Texas 77840 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (6): 507–510. https://doi.org/10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Thomas J. Crowley, Steven K. Baum; Modeling late Paleozoic glaciation. Geology 1992;; 20 (6): 507–510. doi: https://doi.org/10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Late Paleozoic glaciation on Gondwana is associated with changes in geography, solar luminosity, and estimated CO2 levels. To assess the relative importance of these boundary conditions, we conducted a suite of climate model simulations for the periods before, during, and after peak mid-Carboniferous (∼300 Ma) glaciation (340, 300, and 255 and 225 Ma, respectively). Orbital insolation values favorable for glaciation and interglaciation were used for each time interval. Results indicate that changes in geography cause significant changes in snow area, but the temporal trend is not consistent with the geologic record for glaciation. Combined CO2-plus-geography changes yield the best agreement with observations. In addition, interglacial orbital configurations result in almost ice-free conditions for the glacial interval at 300 Ma, at a time of low CO2. The large simulated glacial-interglacial snowline fluctuations for Permian- Carboniferous time may explain cyclothem fluctuations at these times. Overall, results support the importance of the CO2 paradigm, but also indicate that a fuller understanding of past climate change requires consideration of paleogeographic, luminosity, and orbital insolation changes. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.