GLG 301 Lecture Notes - Lecture 2: Multimodal Distribution, Energy, Outer Core
Document Summary
See table of same name under supplementary material for january 12 (at the very bottom) Why none on venus: sea-level is an artifact of the amount of water in the oceans varies over geologic time. Heat transfer: radiative heat travels as electromagnetic radiation, conduction heat moves through a material, convection heat is entrained in and moves with a material. Energy sources for the earth (see supplementary material for january 12 of the same name: external (from the sun) about 2 x 1017 watts. About half of energy (short wavelength radiation) reaches ground, is absorbed, and is re-radiated as long-wavelength radiation. Some stays in the atmosphere for a while resulting in greenhouse effect. Convection 1. 13 x 1013 watts (mainly at mid-ocean ridges) Tidal contribution 0. 27 x 1013 watts. Estimates vary, but ~50-70% due to radioactive decay, ~30- 50% primordial heat from the formation of the earth. This means the convection in the mantle is largely heated from within, not from below.
