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Unformatted text preview: Lecture 1-24-08 GRG 301K The Earth’s Seasons • 21 March – Vernal Equinox (N. Hemisphere tilting toward sun) • 21 June— (tropic of cancer) Summer solstice • 21 September— Autumnal Equinox (sun moving south) • 21 December – (tropic of Capricorn) Winter solstice • Remember… Tropic of Cancer * sun is always directly above Tropic of Capricorn 23.5° N Latitude somewhere between these 23.5° S Latitude Other Terms to Know Circle of Illumination – boundary separating the light and dark part of the earth http://www.fourmilab.ch/cgi-bin/uncgi/Earth/action?opt=-p Lecture 1-24-08 GRG 301K Heat Budget/ Heat Transfer Of 100% of incoming solar radiation… 20% is scattered and reflected by clouds 51% is absorbed by earth 19% is absorbed by atmosphere and clouds 6% is scattered from the atmosphere 4% is reflected by surfaces Earth is heated by the earth not the sun Energy from the sun is solar (shortwave) radiation When energy reflects off earth its long wave (terrestrial) radiation Earth takes a while to absorb energy and heat and vice versa Ways that we transfer energy • Conduction – taking heat from a warmer object to a cooler object. Conduction – taking heat from a warmer object to a cooler object....
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- Spring '08
- Equator, GRG 301K