Lecture_15_CO2_Thermostat

Lecture_15_CO2_Thermostat - 1 1 Energy Balance Energy...

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Unformatted text preview: 1 1 Energy Balance Energy absorbed from sun = Energy emitted by earth, f(T) How to change earth's surface temperature: 1) Change energy absorbed from the sun Change solar output change earths albedo (reFectivity) 2) Change amount of greenhouse gases Doesnt change balance at top of atmosphere (emission T stays the same), but surface T is increased. More than 1 way to satisfy energy balance! 2 Faint Young Sun Paradox Sun increases intensity with time. As more of the H is converted to He, the sun contracts. This increases the rate of fusion, and the temperature will increase. Why wasn't early earth frozen?? to d a y s a tm o s p h e re no atm osphere 2 3 Positive feedback: Process in which perturbation causes system to travel further away from initial state: Negative feedback: Process which causes a system to return to it's initial state upon perturbation: Ice-Albedo feedback Water vapor feedback 4 What stabilizes earths climate? Long term CO 2 regulation by weathering and volcanism 3 5 Weathering of silicate minerals removes CO 2 from atmosphere Crust of simpliFed Earth = CaSiO 3 (wollastonite) 3H 2 0 + 2CO 2 + CaSiO 3-> Ca ++ + 2HCO 3- + H 4 SiO 4- > SiO 2 + CaCO 3 + 3H 2 0 + CO 2 1) CO 2 dissolves in water to form a weak acid, which with time will break up CaSiO 3 into Ca ++ , 2HCO 3-,H 4 SiO 4. This is called chemical weathering. These ions are soluble, and are washed into streams and eventually into the ocean by rainwater....
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Lecture_15_CO2_Thermostat - 1 1 Energy Balance Energy...

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