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On the effect of decreasing CO2 concentration in the atmosphere

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Bordi, I., Fraedrich, K., Sutera, A., & Zhu, X. (2013). On the effect of decreasing CO2 concentration in the atmosphere. Climate Dynamics, 40(3-4), 651-662. doi:10.1007/s00382-012-1581-z.

In the present paper the effect of an abrupt change of the atmospheric radiative forcing is investigated by means of a global climate model that includes a mixed layer ocean. In assessing if, under such a change, the model response has a bifurcation point, the steady solution is studied for a sudden decrease of CO2 concentration from its actual value. It is found that there is a critical threshold for CO2 content below which the model ends up to a snowball Earth. It occurs for a few percentage changes of CO2 concentration around the threshold because the model strongly depends on the relationship among atmospheric temperature, water vapor content and the sudden ice-albedo feedback activation, even in the subtropical regions. Moreover, results suggest that the transition to ice-covered Earth is clearly favoured when Q-flux corrections (i.e. the parameterization of ocean heat transports) are removed.