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Unformatted text preview: 1 1 ATM 6, Lecture #20 Cort Anastasio Atmospheric Science Program University of California - Davis The Climate Machine Part I: Earths Energy Balance and the Greenhouse Effect 2 Climate and Weather What is climate? The average behavior of the atmosphere Includes temperatures, rainfall frequency and amounts, flooding, etc. Includes different spatial scales (e.g., Davis climate versus global climate) and different temporal scales (e.g., weekly vs. annual avgs) What is weather? _____________________________________________ E.g., current Davis weather: cloudy skies and 58 F Climate is what you expect and weather is what you get The climate machine Earths climate depends on the energy balance (energy in and out) Many components to this machine Atmosphere, oceans, land, organisms, ice and snow 2 3 Energy from the Sun (www.seds.org/nineplanets/nineplanets/sol.html; images from NASA) Size 1.4 million km in diameter 2.0 x 10 30 kg (75% H 2 , 25% He) Energetics Core T ~ 15,000,000 K Surface T = 5800 K (~ 10,000 F) Energy comes from nuclear fusion Suns output is major source of energy for Earth 4 Radiation from the Sun Sun radiates (emits) like a blackbody at 5800 K Emissions are electromagnetic radiation (i.e., photons)(i....
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- Fall '07