论文信息 - Theoretical and experimental studies of snow covers microwave emissivity

Theoretical and experimental studies of snow covers microwave emissivity

Microwave radiometers, operating at 3.95, 19.5, 37.5 and 150 GHz and placed in a tower, were used for snow measurements during the winters of 1985-1989. The effects of snow structure, wetness, and grain size were examined in detail. The emissivity of snowpack has been calculated by a quasi-static method and by applying the equation of radiative transfer. The latter takes into account the physical-mechanical properties of the real snowpack obtained by direct glaciological methods. The experimental data are compared against theoretical results. The quasistatic model is shown to be adequate for f < 20 GHz whereas the radiative transfer model agrees for f < 150 GHz, especially when the size distribution of ice particles in snow is included.

V. S. Etkin | V. V. Dmitriev | N. I. Kleeorin | D. A. Boyarskij | V. G. Mirovskij

[1] Martti Hallikainen,et al. Microwave radiometry of snow , 1989 .

[2] E. Schanda,et al. Signatures of snow in the 5 to 94 GHz range , 1978 .

[3] F. Ulaby,et al. Dielectric properties of snow in the 3 to 37 GHz range , 1986 .

[4] Duwayne M. Anderson,et al. LOW-TEMPERATURE PHASES ON INTERFACIAL WATER IN CLAY-WATER SYSTEMS , 1970 .

[5] Martti E. Tiuri. Theoretical and Experimental Studies of Microwave Emission Signatures of Snow , 1982, IEEE Transactions on Geoscience and Remote Sensing.

[6] C. Mätzler,et al. Investigations on snow parameters by radiometry in the 3- to 60-mm wavelength region , 1980 .

[7] F. Ulaby,et al. Microwave Dielectric Behavior of Wet Soil-Part 1: Empirical Models and Experimental Observations , 1985, IEEE Transactions on Geoscience and Remote Sensing.