A change in CO 2 concentration induces a direct radiative forcing that modifies the planetary thermodynamic state, and hence the surface temperature. The infrared cooling, by assuming a constant temperature lapse-rate during the process, will be related to the surface temperature through the Stefan-Boltzmann law in a ratio proportional to the new infrared opacity. Other indirect effects, such as the water vapor and ice-albedo feedbacks, may amplify the system response. In the present paper, we address the question of how a global climate model with a mixed layer ocean responds to different rates of change of a well-mixed greenhouse gas such as CO 2. We provide evidence that different rates of CO 2 variation may lead to similar transient climates characterized by the same global mean surface temperature but different values of CO 2 concentration. Moreover, it is shown that, far from the bifurcation points, the model's climate depends on the history of the radiative forcing displaying a hysteresis cycle that is neither static nor dynamical, but is related to the memory response of the model. Results are supported by the solutions of a zero-dimensional energy balance model. © 2012 Springer-Verlag.
Transient response to well-mixed greenhouse gas changes / Bordi, Isabella; Fraedrich, Klaus; Sutera, Alfonso; Xiuhua, Zhu. - In: THEORETICAL AND APPLIED CLIMATOLOGY. - ISSN 0177-798X. - 109:1-2(2012), pp. 245-252.
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|Titolo:||Transient response to well-mixed greenhouse gas changes|
|Data di pubblicazione:||2012|
|Citazione:||Transient response to well-mixed greenhouse gas changes / Bordi, Isabella; Fraedrich, Klaus; Sutera, Alfonso; Xiuhua, Zhu. - In: THEORETICAL AND APPLIED CLIMATOLOGY. - ISSN 0177-798X. - 109:1-2(2012), pp. 245-252.|
|Appartiene alla tipologia:||01a Articolo in rivista|