Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmpp21b1166k&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #PP21B-1166
Physics
0315 Biosphere/Atmosphere Interactions, 0325 Evolution Of The Atmosphere, 4805 Biogeochemical Cycles (1615)
Scientific paper
The MEP hypothesis states that diabatic processes with sufficient degrees of freedom maintain states at which the rate of entropy production is maximized. A common example in climatology is the application of MEP to poleward heat transport, which leads to predicted equator-pole temperature gradients that are consistent with observations. Here the MEP hypothesis is applied to biotic activity as a diabatic process which affects the atmospheric concentration of carbon dioxide (pCO2) and therefore the strength of the Earth's greenhouse effect. It is first shown with a conceptual climate model that there should be a minimum planetary albedo for which entropy production associated with absorption of solar radiation would be at a maximum as a consequence of the competing effects of surface temperature on the extent of snow cover and convective cloud cover. When pCO2 is simulated by a simple carbon cycle model, it is then shown that the application of MEP to biotic activity leads to an insensitivity of simulated surface temperature to long-term changes in solar luminosity. These predicted changes are consistent with the general suggested pattern of Earth system evolution (decreased greenhouse strength and roughly constant surface temperature through time) and share similarity with the Gaia hypothesis.
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