ISCI 1001 Lecture Notes - Lecture 22: Radiative Forcing, Soot, Energy Economics
26 Nov 2015
School
Department
Course
Professor
Document Summary
Microscopic droplets/particles suspended in air: warming -> soot particles (black) absorb solar radiation, cooling -> whiter particles reflect solar e, cooling effect. Measure of substance"s effect on earth"s energy balance. Amount of change in energy a given factor causing radiative forcing. O3 tropospheric ~ +0. 4: stratospheric ~ -0. 1. Surface albedo soot on snow +0. 1: on land ~ -0. 3. Precession of earth"s axis (19 000-23 000 yr) Change in shape of earth"s orbit around sun (100 000y) Sufficient to trigger long term climate variation: periodic glaciation (cool, interglaciations (warm) Small effect ~ 0. 12 watts/m2: less than anthropogenic effects. Ocean = co2 sink: holds about 50x co2, holds about 50x co2 as atmosphere. As oceans warms -> absorbs less co2. Near equator -> ocean receives more heat e than it emits (warm) Near poles -> ocean emit more heat e than it receives (cool) As water -> toward poles: cools -> more dense -> sinks -> replaced by warmer water from equator.
