CO2-forced climate thresholds during the Phanerozoic

  title={CO2-forced climate thresholds during the Phanerozoic},
  author={Dana L. Royer},
  journal={Geochimica et Cosmochimica Acta},
  • D. Royer
  • Published 1 December 2006
  • Geography, Environmental Science
  • Geochimica et Cosmochimica Acta

Figures from this paper

Isotopic evidence for long term warmth in the Mesozoic

The results are consistent with a warm climate mode for the Jurassic and Cretaceous and hence support the view that changes in atmospheric CO2 concentrations are linked with changes in global temperatures.

Siberian glaciation as a constraint on Permian–Carboniferous CO2 levels

Reconstructions of Phanerozoic CO2 levels have generally relied on geochemical modeling or proxy data. Because the uncertainty inherent in such reconstructions is large enough to be climatically

Geobiological constraints on Earth system sensitivity to CO₂ during the Cretaceous and Cenozoic.

Earth system climate sensitivity (ESS) is the long‐term (>103 year) response of global surface temperature to doubled CO2 that integrates fast and slow climate feedbacks. ESS has energy policy

Target atmospheric CO2: Where should humanity aim?

Paleoclimate data show that climate sensitivity is ~3 deg-C for doubled CO2, including only fast feedback processes. Equilibrium sensitivity, including slower surface albedo feedbacks, is ~6 deg-C

Modeling the early Paleozoic long-term climatic trend

The early Paleozoic climate has been described as warm and equable. However, recent data based on conodont oxygen isotopic composition reveal a large, long, cooling trend through the Ordovician,

Linkages between CO2, climate, and evolution in deep time

  • D. Royer
  • Environmental Science, Geography
    Proceedings of the National Academy of Sciences
  • 2008
New data are presented that overturns the notion that other radiative forcings such as changes in paleogeography or meridional heat transport were disproportionately more important than CO2 at this time and provide important insights into the climatic linkages during this Epoch.

Evolutionary History of Atmospheric CO2 during the Late Cenozoic from Fossilized Metasequoia Needles

Based on the stomatal index of fossilized Metasequoia needles, a history of atmospheric CO2 concentrations from middle Miocene to late Early Pleistocene when the climate changed dramatically is reconstructed, indicating that CO2 decrease and temperature decrease are coupled.

Middle Eocene CO2 and climate reconstructed from the sediment fill of a subarctic kimberlite maar

Eocene paleoclimate reconstructions are rarely accompanied by parallel estimates of CO 2 from the same locality, complicating assessment of the equilibrium climate response to elevated CO 2 . We

Geologic constraints on earth system sensitivity to CO 2 during the Cretaceous and early Paleogene

Abstract. Earth system sensitivity (ESS) is the long-term (>103 yr) equilibrium temperature response to doubled CO2. ESS has climate policy implications because global temperatures are not expected

Methane and the CH4 related greenhouse effect over the past 400 million years

Natural variations in the tropospheric CH4 concentration, excluding short bursts from geospheric reservoirs, have been estimated for the past 400 Ma by scaling a wetland CH4 emission estimate for the



An atmospheric pCO2 threshold for glaciation in the Late Ordovician

The Late Ordovician glaciation differs from other major Phanerozoic glaciations because of its short duration (∼1 m.y.). A satisfactory explanation for this glaciation must be able to account for its

Evidence for decoupling of atmospheric CO2 and global climate during the Phanerozoic eon

A reconstruction of tropical sea surface temperatures throughout the Phanerozoic eon (the past ∼550 Myr) from the database of oxygen isotopes in calcite and aragonite shells indicates large oscillations of tropicalSea surface temperatures in phase with the cold–warm cycles, thus favouring the idea of climate variability as a global phenomenon.

Toward reconciliation of Late Ordovician (∼440 Ma) glaciation with very high CO2 levels

Although Phanerozoic glaciations usually coincided with times of estimated low atmospheric CO2, the Late Ordovician (440 Ma) glaciation is a significant exception. CO2 levels during that time may

Reconciling Late Ordovician (440 Ma) glaciation with very high (14X) CO2 levels

Geochemical data and models suggest a positive correlation between carbon dioxide changes and climate during the last 540 m.y. The most dramatic exception to this correlation involves the Late

Ancient atmospheric C02 pressures inferred from natural goethites

THE role of changing atmospheric CO2 concentrations in controlling global temperature can be investigated by examining variations in both CO2 and climate preserved in the Earth's geological record. A

Geocarb III: A Revised Model of Atmospheric CO2 over Phanerozoic Time

  • R. Berner
  • Environmental Science, Geography
  • 1994
Revision of the GEOCARB model (Berner, 1991, 1994) for paleolevels of atmospheric CO2, has been made with emphasis on factors affecting CO2 uptake by continental weathering. This includes: (1) new


The analysis of the geologic record has revealed a question concerning how the Late Ordovician glaciation could have occurred simultaneously with high CO2 levels (10–18x). Sensitivity studies using a

A model for atmospheric CO 2 over Phanerozoic time

A new model has been constructed for calculating the level of atmospheric CO{sub 2} over Phanerozoic time which is much simpler mathematically than the BLAG model, but more complex geologically and

Phanerozoic atmospheric CO2 change: evaluating geochemical and paleobiological approaches