Modeling late Paleozoic glaciation

Crowley, T J; Baum, S K

doi:10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2

Title: Modeling late Paleozoic glaciation

Full Record
Other Related Research

Abstract

Late Paleozoic glaciation on Gondwana is associated with changes in geography, solar luminosity, and estimated CO{sub 2} levels. To assess the relative importance of these boundary conditions, the authors conducted a suite of climate model simulations for the periods before, during, and after peak mid-Carboniferous ({approximately}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 CO{sub 2}-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 CO{sub 2}. 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 CO{sub 2} paradigm, but also indicate that a fuller understanding of past climate change requires consideration of paleogeographic, luminosity, and orbital insolation changes.

Authors:

Crowley, T J; Baum, S K ^[1]

Applied Research Corp., College Station, TX (United States)

Publication Date:: Mon Jun 01 00:00:00 EDT 1992

OSTI Identifier:: 6952068

Resource Type:: Journal Article

Journal Name:: Geology; (United States)

Additional Journal Information:: Journal Volume: 20:6; Journal ID: ISSN 0091-7613

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; ATMOSPHERIC CHEMISTRY; CLIMATE MODELS; EARTH PLANET; PALEOCLIMATOLOGY; CARBON DIOXIDE; CARBONIFEROUS PERIOD; GEOCHEMISTRY; GLACIERS; ICE CAPS; PERMIAN PERIOD; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMISTRY; GEOLOGIC AGES; ICE; MATHEMATICAL MODELS; OXIDES; OXYGEN COMPOUNDS; PALEONTOLOGY; PALEOZOIC ERA; PLANETS; 580000* - Geosciences

Citation Formats


                    Crowley, T J, and Baum, S K. Modeling late Paleozoic glaciation.  United States: N. p., 1992. 
        Web.  doi:10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2.

Copy to clipboard


                    Crowley, T J, & Baum, S K. Modeling late Paleozoic glaciation.  United States.  https://doi.org/10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2

Copy to clipboard


                    Crowley, T J, and Baum, S K. 1992.  
        "Modeling late Paleozoic glaciation".  United States.  https://doi.org/10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2.

Copy to clipboard


                    
@article{osti_6952068,

  title        = {Modeling late Paleozoic glaciation},

  author       = {Crowley, T J and Baum, S K},

  abstractNote = {Late Paleozoic glaciation on Gondwana is associated with changes in geography, solar luminosity, and estimated CO{sub 2} levels. To assess the relative importance of these boundary conditions, the authors conducted a suite of climate model simulations for the periods before, during, and after peak mid-Carboniferous ({approximately}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 CO{sub 2}-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 CO{sub 2}. 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 CO{sub 2} paradigm, but also indicate that a fuller understanding of past climate change requires consideration of paleogeographic, luminosity, and orbital insolation changes.},

  doi          = {10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2},

  url          = {https://www.osti.gov/biblio/6952068},
  journal      = {Geology; (United States)},

  issn         = {0091-7613},

  number       = ,

  volume       = 20:6,

  place        = {United States},

  year         = {Mon Jun 01 00:00:00 EDT 1992},

  month        = {Mon Jun 01 00:00:00 EDT 1992}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1130/0091-7613(1992)020<0507:MLPG>2.3.CO;2

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Snowline instability in a general circulation model: application to Carboniferous glaciation

Journal Article Crowley, T; Baum, S - Climate Dynamics

For over twenty years it has been known that energy balance models (EBMs) with snow-albedo feedback are characterized by unstable behavior in some areas of parameter space. This behaviour leads to rapid changes in snow area due to small changes in forcing, and has been termed the small ice cap instability (SICI). It has never been clarified whether this behaviour reflects a real feature of the climate system or a limitation in EBMs. In this study we demonstrate that evidence for similar unstable behavior can also be found in an atmospheric general circulation model (GCM), using a realistic set ofmore »« less
https://doi.org/10.1007/BF00219476
Late cenozoic lacustrine and climatic environments at Tule Lake, northern Great Basin, USA

Journal Article Bradbury, J - Climate Dynamics

Cores of lake sediment to a depth of 334 m in the town of Tulelake, northern California, document the late Cenozic paleolimnologic and paleoclimatic history of the northwestern Great Basin. Lacustrine diatoms are abundant throughout the record documenting a nearly continuous paleolimnologic history of the Tule Lake basin. Except for a drier (and cooler?) interval recorded by Fragilaria species about 2.4 Ma, the Pliocene is characterized by a dominance of planktonic Aulacoseira solida implying a warm monomictic lake under a climatic regime of low seasonality. Much of the Pleistocene is dominated by Stephanodiscus and Fragilaria species suggesting a cooler, drier,more »« less
https://doi.org/10.1007/BF00193541
Paleoclimatic significance of Middle Pleistocene glacial deposits in the Kotzebue Sound region, northwest coastal Alaska

Conference Roof, S; Brigham-Grette, J - Geological Society of America, Abstracts with Programs; (United States)

During Middle Pleistocene time, glaciers extended from the western Brooks Range in NW Alaska to the coast at Kotzebue Sound, forming Baldwin Peninsula, a 120 km-long terminal moraine. Marine, glacigenic, and fluvial facies exposed along coastal bluffs surrounding Kotzebue Sound and Hotham Inlet indicate that at least the initial stages of the glacial advance occurred while sea level was high enough to cover the shallow Bering Shelf. Although it is presently uncertain if the ice actually reached tidewater before extensive middle-latitude ice-sheet formation, the marine and glacigenic facies clearly indicate that this advance must have occurred significantly out-of-phase with lowermore »« less
700,000 years of tropical Andean glaciation

Journal Article Rodbell, D.; Hatfield, R.; Abbott, M.; ... - Nature (London)

Our understanding of the climatic teleconnections that drove ice-age cycles has been limited by a paucity of well-dated tropical records of glaciation that span several glacial–interglacial intervals. Glacial deposits offer discrete snapshots of glacier extent but cannot provide the continuous records required for detailed interhemispheric comparisons. By contrast, lakes located within glaciated catchments can provide continuous archives of upstream glacial activity, but few such records extend beyond the last glacial cycle. Here a piston core from Lake Junín in the uppermost Amazon basin provides the first, to our knowledge, continuous, independently dated archive of tropical glaciation spanning 700,000 years. We findmore »« less
https://doi.org/10.1038/s41586-022-04873-0

Full Text Available
Representation of Global Climate Change in Performance Assessment Models for Disposal of Radioactive Waste - 17183

Conference Crowe, Bruce; Black, Paul; Duffy, Paul; ...

Evolving concepts of global climate change that include impacts of anthropogenic greenhouse gases require reassessment of conventional conservative approaches in performance assessment studies that assume cold and wet future glacial climates. Global paleo-climate data for the Quaternary (past 2 million years) show saw-tooth patterns (temperature/proxy temperature data versus time) of glacial and interglacial intervals accompanied by cyclical changes in the atmospheric content of CO{sub 2} (low contents during glacial cycles and higher contents during interglacial cycles). These cycles are correlated with changes in the earth's orbital configurations (Milankovitch cycles) but require nonlinear linkages with additional climate-forcing components to reproduce pastmore »« less

Similar Records