北大定量遥感梁顺林L2.RT.pdf

文档介绍：北京大学第六届暑期“定量遥感”研究生精品课程班
June 30, 2009
L2. Atmospheric Radiative Transfer
Theory
梁顺林, Professor
Department of Geography
University of Maryland at College Park, USA
******@, /~sliang
1
ic spectrum
2
Planck’s spectral distribution law
• Planck introduced in 1901 his
hypothesis of quantized oscillators in
a radiating body.
• He derived an expression for the
hemispherical blackbody spectral
radiative flux
2 3
BB m r 2πhν
Fν= 2
c [exp( hν/ kB T) −1]
WWeehere h is Pla nc k’s co nsta nt, mr isst the
real index of refraction, kB is 3
Boltzmann’s constant
Comparison of solar and earth’s
blackb od y i nt ensit y
4
UV-VISIBLE SOLAR SPECTRUM
5
INFRARED FLUX FROM EARTH
SAHARA
6
Spectral Characteristics of Energy
Sources and Sensing Systems
7
Haze
layer
Clean
atmosphere
Haze
layer
8
9
Atmospheric transmittance
10