GEOG 1040H Lecture Notes - Lecture 3: Ionosphere, Refraction, Radiography

• School: Trent University
• Department: Geography
• Course: GEOG 1040H
• Professor: Buttle Jim

Document Summary

Electromagnetic energy: scattered and absorbed by gas molecules, dust and cloud particles in the atmosphere. Ionosphere absorbs: gamma rays, x-rays, some uv rays. Ozonosphere: part of the stratosphere, ozone absorbs uv energy and convert it to heat, be(cid:374)efi(cid:272)ial to life (cid:894)u(cid:374)less it(cid:859)s a lo(cid:449) ozo(cid:374)e(cid:895, co2 very effective at absorbs large wavelengths, atmospheric windows allow us to measure the surface. Mie scattering: radiation comes into contact with molecule particles, clouds, pollution and water droplets are of a similar size to the wave length of all visible radiation, no (cid:449)a(cid:448)e le(cid:374)gths prefere(cid:374)tially s(cid:272)attered so sky is (cid:858)grey(cid:859) Albedo and reflection: albedo valves (% reflected, average albedo for earth 31, black ash fault absorbs more than albedos (5-10%, sun is directly overhead very little reflection. Clouds and earths (cid:862)greenhouse(cid:863): high clouds (cirrus clouds): net greenhouse forcing and atmospheric warming. Most shortwave insolation transmitted to surface: low clouds (strartus clouds): net albedo forcing and atmospheric cooling.