1 CIMSS/SSEC Effort on the CIMSS/SSEC Effort on the Fast IR Cloudy Forward Model Fast IR Cloudy Forward Model Development Development A Fast Parameterized Single Layer Infrared A Fast Parameterized Single Layer Infrared Cloudy Forward Model Status and Features Cloudy Forward Model Status and Features Hung-Lung Allen Huang & Colleagues CIMSS/SSEC, Univ. of WI-Madison & Ping Yang, Texas A&M 2 nd Workshop on Advanced High Spectral Resolution Infrared Observations Ravello, Italy 24-26 May 2004
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CIMSS/SSEC Effort on the Fast IR Cloudy Forward Model Development
CIMSS/SSEC Effort on the Fast IR Cloudy Forward Model Development. A Fast Parameterized Single Layer Infrared Cloudy Forward Model Status and Features Hung-Lung Allen Huang & Colleagues CIMSS/SSEC, Univ. of WI-Madison & Ping Yang, Texas A&M - PowerPoint PPT Presentation
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CIMSS/SSEC Effort on the CIMSS/SSEC Effort on the Fast IR Cloudy Forward Model DevelopmentFast IR Cloudy Forward Model Development
A Fast Parameterized Single Layer Infrared A Fast Parameterized Single Layer Infrared Cloudy Forward Model Status and FeaturesCloudy Forward Model Status and Features
Hung-Lung Allen Huang & ColleaguesCIMSS/SSEC, Univ. of WI-Madison
& Ping Yang, Texas A&M
2nd Workshop on Advanced High Spectral Resolution Infrared Observations
Q u ic k T im e ™ a n d aG ra p h ic s d e c o m p re s s o r
a re n e e d e d to s e e th is p ic tu re .
I0T(µ)a1(µ)
a0Clouds
The Surface
I0
I1
I1
Icld(µ)a1(µ) (µ)a1(µ)I1
a1
Itop()I0T()a1() Iclda1() I1 I1()a1()
Computing techniques:• FDTD: the finite-difference time-
domain method • IGOM: Improved geometric optics
method • SSPM: Stretched scattering potential
methodComposite method: A combination of FDTD or
other method (such as the T-matrix) with the weighted summation of approximate solutions for obtaining the single-scattering properties for small size parameters to large size parameters.
Parameterization:• Based on the effective size of in-situ
• The finite difference time domain (FDTD) code (Yang and Liou, 1996a, Yang et al. 2000, 2004) for small particles with size parameters up to 20.
• The T-matrix method (Mishchenko 1989) for small spheroids.
• A combination of an improved geometric optics method (IGOM) (Yang and Liou, 1996b) and the method of Lorenz-Mie Equivalent spheres (equivalence in volume for plates and hollow columns, or in terms of the ratio of volume to project area for other shapes) for medium to large particle sizes.