Iwabuchi and Yang 2011

Recent review of the available models and databases for pure ice (Ih) and water dielectric properties. Temperature dependence is mainly investigated
Iwabuchi and Yang 2011
Coverage of the existing database in the temperature/wavelength space

Author

Hironobu Iwabuchi

Reference

Iwabuchi, Hironobu, and Ping Yang. "Temperature dependence of ice optical constants: Implications for simulating the single-scattering properties of cold ice clouds." Journal of Quantitative Spectroscopy and Radiative Transfer 112.15 (2011): 2520-2525.

Details

Range of temperatures

160 to 270 Kelvin

Range of wavelengths

10**-7 to 1 meter

Substances

Water, Ice

Extended description

 

For a spectrum from ultraviolet to microwave and a temperature range from 160 to 270 K, the optical constants of water ice are compiled on the basis of the Kramers–Kronig relation in conjunction with existing datasets reported in literature. Significant temperature dependence is observed in both the mid-infrared and longer wavelengths. A sensitivity study at wavelengths in the infrared split window region indicates that the temperature dependence of the single-scattering properties of ice crystals is not negligible. Thus, it is necessary to take into account the temperature dependence of ice optical constants when simulating the radiative properties of cirrus clouds for various applications to remote sensing under cirrus cloud conditions.

A compilation of the optical constants of water ice has been presented for a temperature range between 160 and 270 K, complementing the compilation by Warren and Brandt (2008) for a temperature of 266 K. Since cirrus clouds appear at low temperatures, the optical properties of cirrus ice particles may differ from those of warmer ice particles in the infrared and at longer wavelengths. The appropriate optical constants, accounting for the temperature dependence, need to be used in the retrieval of cirrus cloud properties from satellite observations. As we complemented missing data by interpolation, extrapolation, and the KK relations, robust measurement data are desirable and expected to reduce the uncertainities particularly at temperatures around 233 K in the near-, mid-, and far-IR regions.