1. Evaluation of emission from snow-covered ground for passive microwave remote sensing.
- Author
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Jiang, Lingmei, Tjuatja, Saibun, Shi, Jiancheng, Zhang, Lixin, and Zhao, Kaiguang
- Subjects
MICROWAVE remote sensing ,SNOW density ,RADIOACTIVE snow gages ,OPTICAL polarization ,RADIOMETERS - Abstract
This article investigates emission behaviour at frequencies of 18.7, 36.5 and 89 GHz and an incidence angle of 55° over a snow-covered surface at the local scale observation site in Fraser, CO, USA, using both one-layer and two-layer emission models. The models employ the matrix doubling approach to implement the radiative-transfer equation based on dense media theory and the advanced integral equation model. When compared to Ground-Based Passive Microwave Radiometer (GBMR-7) observation on 21 February 2003, both the models could simulate the observed brightness temperature well, but the polarization difference between the observation and the models was smaller for the two-layer emission model than the one-layer model. In addition, we successfully interpreted the emission magnitude and polarization separation of a snow-removed surface by incorporating a Mie scattering transition layer above the soil medium. In this work, we also demonstrated the effect of snow fraction on the brightness temperature difference at 18.7 and 36.5 GHz over a snow-covered surface with the field observation. In conclusion, we demonstrate the snow impact on soil surface with snow depth (SD) and snow fraction variation through modelling and in situ data. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
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