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We present the construction of a dynamic area fraction model (DAFM), representing a new class of mod- els for an earth-like planet. The model presented here has no spatial dimensions, but contains coupled parameteriza- tions for all the major components of the hydrological cy- cle involving liquid, solid and vapor phases. We investigate the nature of feedback processes with this model in regu- lating Earth's climate as a highly nonlinear coupled system. The model includes solar radiation, evapotranspiration from dynamically competing trees and grasses, an ocean, an ice cap, precipitation, dynamic clouds, and a static carbon green- house effect. This model therefore shares some of the charac- teristics of an Earth System Model of Intermediate complex- ity. We perform two experiments with this model to deter- mine the potential effects of positive and negative feedbacks due to a dynamic hydrological cycle, and due to the relative distribution of trees and grasses, in regulating global mean temperature. In the first experiment, we vary the intensity of insolation on the model's surface both with and without an active (fully coupled) water cycle. In the second, we test the strength of feedbacks with biota in a fully coupled model by varying the optimal growing temperature for our two plant species (trees and grasses). We find that the negative feed- backs associated with the water cycle are far more powerful than those associated with the biota, but that the biota still play a significant role in shaping the model climate. third ex- periment, we vary the heat and moisture transport coefficient in an attempt to represent changing atmospheric circulations.

Role of the hydrological cycle in regulating the planetary climate system of a simple nonlinear dynamical model