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Record #112789:

Toward reconciliation of Late Ordovician (about 440 Ma) glaciation with very high CO₂ levels / Thomas J. Crowley, Steven K. Baum.

Title: Toward reconciliation of Late Ordovician (about 440 Ma) glaciation with very high CO₂ levels / Thomas J. Crowley, Steven K. Baum.
Author(s): Crowley, Thomas J.
Baum, Steven K.
Date: 1991.
In: Journal of Geophysical Research. (1991.), Vol. 96(D12) (1991)
Abstract: In earlier paper, it was suggested that unique geographic configuration of Gondwana may explain this phenomenon, as edge was essentially tangent to South Pole and moderating effect of nearby ocean may have suppressed magnitude of summer warming in landmass, thus allowing glacier inception. Limitation to this study was that it used linear energy balance model (EBM). In this paper, hypothesis is tested further using nonlinear EBM that allows for snow-albedo feedback. Also uses updated estimates for CO₂ levels, decreases in solar luminosity, and variations in orbital forcing. Concludes that palaeogeography modifies role of CO₂ in long-term evolution of climate.
Notes:

Journal of Geophysical Research. Vol. 96(D12) :22, 597-22, 610 (1991).

Keywords: 551.58 -- Climatology.
551.583.3 -- Climatic changes, Quaternary.
551.338 -- Ice ages, theories of causation.
551.336 -- Ice ages.
551.733.1 -- Ordovician.
E7 -- Glaciology: glacial geology and ice ages.
SPRI record no.: 112789

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245 10 ‡aToward reconciliation of Late Ordovician (about 440 Ma) glaciation with very high CO₂ levels /‡cThomas J. Crowley, Steven K. Baum.
260 ## ‡a[S.l.] :‡b[s.n.],‡c1991.
300 ## ‡ap. 22, 597-22, 610 :‡bdiags., table, maps.
500 ## ‡aJournal of Geophysical Research. Vol. 96(D12) :22, 597-22, 610 (1991).
520 3# ‡aIn earlier paper, it was suggested that unique geographic configuration of Gondwana may explain this phenomenon, as edge was essentially tangent to South Pole and moderating effect of nearby ocean may have suppressed magnitude of summer warming in landmass, thus allowing glacier inception. Limitation to this study was that it used linear energy balance model (EBM). In this paper, hypothesis is tested further using nonlinear EBM that allows for snow-albedo feedback. Also uses updated estimates for CO₂ levels, decreases in solar luminosity, and variations in orbital forcing. Concludes that palaeogeography modifies role of CO₂ in long-term evolution of climate.
650 07 ‡a551.58 -- Climatology.‡2udc
650 07 ‡a551.583.3 -- Climatic changes, Quaternary.‡2udc
650 07 ‡a551.338 -- Ice ages, theories of causation.‡2udc
650 07 ‡a551.336 -- Ice ages.‡2udc
650 07 ‡a551.733.1 -- Ordovician.‡2udc
650 07 ‡aE7 -- Glaciology: glacial geology and ice ages.‡2local
700 1# ‡aBaum, Steven K.
773 0# ‡7nnas ‡tJournal of Geophysical Research. ‡gVol. 96(D12) (1991) ‡wSPRI-35252
917 ## ‡aUnenhanced record from Muscat, imported 2019
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