CEE 4221 Lecture Notes - Lecture 9: Particle Size, Red, Mie Scattering

• School: Temple University
• Department: Civil Engineering
• Course: CEE 4221
• Professor: Brooks

Document Summary

Oxygen and nitrogen (cid:2) blue (shorter wavelength) is scattered more. Blue light is scattered around four times the red light. Uv light is scattered about 16 times the red light. A blue sky is a manifestation of rayleigh scatter (cid:2) orange or red colour during sunrise and sunset. Sun rays have to travel a longer path. Complete scattering (and absorption) of shorter wavelength radiations. Only the longer wavelength (orange and red) which are less scattered are visible (cid:2) other examples. Bluish-grey cast in a color image when taken from high altitude (cid:1) (cid:1)(cid:2)(cid:3)(cid:4)(cid:4)(cid:5)(cid:6)(cid:7)(cid:8)(cid:9)(cid:10)(cid:10) (cid:11)(cid:16)(cid:7)(cid:5)(cid:10)(cid:1)(cid:2)(cid:3)(cid:4)(cid:4)(cid:5)(cid:6)(cid:7)(cid:8)(cid:9)(cid:10) (cid:1) occurs when the wavelengths of the energy is almost equal to the diameter of the atmospheric particles. Usually caused by the aerosol particles such as dust, smoke and pollen. Gas molecules are too small to cause mie scattering of the radiation commonly used for remote sensing (cid:1) longer wavelengths also get scattered compared to rayleigh scatter (cid:1)