Using CCSM4 (B_1850)， I simulate the initiation of Snowball Earth under an abrupt decrease in solar radiation and/or CO2 concentration, such as 12% less solar radiation than the present level. The model blows up just prior to the completely ice-covered state. The error message follows:
58:POP_SolversChronGear: solver not converged
58:POP_SolverRun: error in ChronGear
58:POP_BarotropicDriver: error in solver
58:Step: error in barotropic
When I do the similar simulations using CCSM3, the error message did not arise.
Look forward to any suggestions. Thanks.
University of Chicago