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GEOCARB III: a revised model of atmospheric CO 2 over Phanerozoic time (2001)
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| Venue: | Am. J. Sci |
| Citations: | 135 - 6 self |
BibTeX
@ARTICLE{Berner01geocarbiii:,
author = {Robert A. Berner and Zavareth Kothavala},
title = {GEOCARB III: a revised model of atmospheric CO 2 over Phanerozoic time},
journal = {Am. J. Sci},
year = {2001},
pages = {182--204}
}
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Abstract
of atmospheric CO 2, has been made with emphasis on factors affecting CO 2 uptake by continental weathering. This includes: (1) new GCM (general circulation model) results for the dependence of global mean surface temperature and runoff on CO 2, for both glaciated and non-glaciated periods, coupled with new results for the temperature response to changes in solar radiation; (2) demonstration that values for the weathering-uplift factor f R(t) based on Sr isotopes as was done in GEOCARB II are in general agreement with independent values calculated from the abundance of terrigenous sediments as a measure of global physical erosion rate over Phanerozoic time; (3) more accurate estimates of the timing and the quantitative effects on Ca-Mg silicate weathering of the rise of large vascular plants on the continents during the Devonian; (4) inclusion of the effects of changes in paleogeography alone (constant CO 2 and solar radiation) on global mean land surface temperature as it affects the rate of weathering; (5) consideration of the effects of volcanic weathering, both in subduction zones and on the seafloor; (6) use of new data on the � 13 C values for Phanerozoic limestones and organic matter; (7) consideration of the relative weathering
Keyphrases
atmospheric co phanerozoic time revised model geocarb iii solar radiation large vascular plant terrigenous sediment phanerozoic limestone global physical erosion rate non-glaciated period new data geocarb ii independent value new gcm quantitative effect sr isotope new result weathering-uplift factor general circulation model global mean surface temperature continental weathering global mean land surface temperature temperature response accurate estimate constant co ca-mg silicate weathering subduction zone organic matter volcanic weathering general agreement relative weathering
