UNIVERSITY OF TORONTO

• Main Authors: John Wilfrid Crowley, J. W. Crowley
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2006
• Subjects: Peltier; Ice Sheet
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1777; http://www.snowballearth.org/JWCrowley_Thesis.pdf

ii The carbon cycle model of Rothman et al. [2003] is modified by allowing temperature dependent photosynthetic and remineralization fluxes and through the introduction of a temperature dependent photosynthetic isotopic fractionation. The carbon model is then coupled to the energy balance/ice-sheet model (EBM)/(ISM) of Peltier and Tarasov [1999]. Two major solutions are found. For a magnitude of the remineralization flux parameter of 0.0003 or less, a hysteresis loop forms in the temperature-dRad phase space with oscillations having a period controlled by the flux parameter and which can have glacial-interglacial timescales greater than 3Myr. When the magnitude of the remineralization flux parameter is greater than or equal to 0.0006, the system approaches an equilibrium state. There is a suggestion in the results of the simulation with the remineralization flux parameter set to 0.0006 that a Hard Snowball Earth state could exist for values of the flux parameter greater than 0.0006. Isotopic data for inorganic carbon is produced which matches data from the Neoproterozoic era