Interpretation of ATSR-2 measurements of cirrus clouds using phase functions of imperfect hexagonal ice crystals

1998 ◽  
Author(s):  
Wouter H. Knap ◽  
M. Hess ◽  
Piet Stammes ◽  
Robert B. A. Koelemeijer ◽  
Philip D. Watts
Keyword(s):  
Cirrus Clouds ◽  
Ice Crystals ◽  
Hexagonal Ice ◽  
Phase Functions

Backscatter ratios for arbitrary oriented hexagonal ice crystals of cirrus clouds

2014 ◽  
Vol 39 (19) ◽  
pp. 5788 ◽  
Author(s):  
Anatoli Borovoi ◽  
Alexander Konoshonkin ◽  
Natalia Kustova
Keyword(s):  
Cirrus Clouds ◽  
Ice Crystals ◽  
Hexagonal Ice

Scattering matrixes of hexagonal ice crystals of cirrus clouds calculated for problems of radiation balance

2018 ◽  
Author(s):  
Natalia V. Kustova ◽  
Anatoli G. Borovoi ◽  
Alexander V. Konoshonkin ◽  
Andrey P. Lyulyakin ◽  
Tatiana B. Zhuravleva ◽  
...  
Keyword(s):  
Cirrus Clouds ◽  
Ice Crystals ◽  
Radiation Balance ◽  
Hexagonal Ice

Light scattering by absorbing hexagonal ice crystals in cirrus clouds

1995 ◽  
Vol 34 (25) ◽  
pp. 5867 ◽  
Author(s):  
Jianyun Zhang ◽  
Lisheng Xu
Keyword(s):  
Light Scattering ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Hexagonal Ice

scholarly journals Cirrus optical thickness and crystal size retrieval from ATSR-2 data using phase functions of imperfect hexagonal ice crystals

1999 ◽  
Vol 104 (D24) ◽  
pp. 31721-31730 ◽  
Author(s):  
Wouter H. Knap ◽  
Michael Hess ◽  
Piet Stammes ◽  
Robert B. A. Koelemeijer ◽  
Phil D. Watts
Keyword(s):  
Optical Thickness ◽  
Crystal Size ◽  
Ice Crystals ◽  
Hexagonal Ice ◽  
Phase Functions

Scattering phase functions of horizontally oriented hexagonal ice crystals

2006 ◽  
Vol 100 (1-3) ◽  
pp. 91-102 ◽  
Author(s):  
Guang Chen ◽  
Ping Yang ◽  
George W. Kattawar ◽  
Michael I. Mishchenko
Keyword(s):  
Ice Crystals ◽  
Hexagonal Ice ◽  
Scattering Phase ◽  
Phase Functions

Backscattering by hexagonal ice crystals of cirrus clouds

2013 ◽  
Vol 38 (15) ◽  
pp. 2881 ◽  
Author(s):  
Anatoli Borovoi ◽  
Alexander Konoshonkin ◽  
Natalia Kustova
Keyword(s):  
Cirrus Clouds ◽  
Ice Crystals ◽  
Hexagonal Ice

Considerations for Modeling Thin Cirrus Effects via Brightness Temperature Differences

1995 ◽  
Vol 34 (2) ◽  
pp. 447-459 ◽  
Author(s):  
E. O. Schmidt ◽  
R. F. Arduini ◽  
B. A. Wielicki ◽  
R. S. Stone ◽  
S-C. Tsay
Keyword(s):  
Brightness Temperature ◽  
Surface Area ◽  
Careful Consideration ◽  
Ice Crystals ◽  
Ice Crystal ◽  
Polynomial Coefficients ◽  
Hexagonal Ice ◽  
Scattering Phase ◽  
Phase Functions ◽  
Very High

Abstract Brightness temperature difference (BTD) values are calculated for selected Geostationary Operational Environmental Satellite (GOES-6) channels (3.9, 12.7 µm) and Advanced Very High Resolution Radiometer channels (3.7, 12.0 µm). Daytime and nighttime discrimination of particle size information is possible given the infrared cloud extinction optical depth and the BTD value. BTD values are presented and compared for cirrus clouds composed of equivalent ice spheres (volume, surface area) versus randomly oriented hexagonal ice crystals. The effect of the hexagonal ice crystals is to increase the magnitude of the BTD values calculated relative to equivalent ice sphere (volume, surface area) BTDs. Equivalent spheres (volume or surface area) do not do a very good job of modeling hexagonal ice crystal effects on BTDs; however, the use of composite spheres improves the simulation and offers interesting prospects. Careful consideration of the number of Legendre polynomial coefficients used to fit the scattering phase functions is crucial to realistic modeling of cirrus BTDs. Surface and view-angle effects are incorporated to provide more realistic simulation.

scholarly journals On the scattering behaviour of bullet-rosette and bullet-shaped ice crystals

1996 ◽  
Vol 14 (5) ◽  
pp. 566-573
Author(s):  
B. Strauss
Keyword(s):  
Ray Tracing ◽  
Ice Crystals ◽  
Asymmetry Factor ◽  
Model Calculations ◽  
Geometrical Features ◽  
The Asymmetry ◽  
Particle Length ◽  
Phase Functions ◽  
Tracing Method ◽  
Factor G

Abstract. The scattering behaviour of bullet-rosette and bullet-shaped ice particles is investigated using model calculations (ray tracing method) with special emphasis on the asymmetry factor g. Because the variability of the geometrical features of these particles is very large, some representative shapes are used in the calculations. The model is based on geometrical optics, and particles are assumed to be oriented randomly; a wavelength of 0.56 μm is considered; absorption is neglected. The scattering behaviour of bullet rosettes is compared to that of single branches out of the bullet rosette. It turns out that there are slight differences in the asymmetry factor values, depending on the lengths of the branches (∆g~0.02) and on the angles between the branches (∆g~0.01). Bullets show some special features in their phase functions due to the pyramid. The length of the particle influences the asymmetry factor (∆g~0.10), as does the shape of the pyramid (∆g~0.07). The influence of the pyramidal shape decreases with increasing particle length. Bullets were compared to hexagonally shaped columns. This was done for two columns, one as long as the columnar part of the bullet (length without pyramid), and one for a column as long as the bullet including the pyramid. Asymmetry factor values of bullets with a pyramidal angle of 28° deviate less than ∆g~0.01 from the range given by the two values of the columns.

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