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Studies of snowpack properties by passive microwave radiometry (Document No: 19790008308)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Rango, A. Hall, D. K. Chang, A. T. C. Foster, J. L. Schmugge, T. J. |
| Copyright Year | 1978 |
| Description | Research involving the microwave characteristics of snow was undertaken in order to expand the information content currently available from remote sensing, namely the measurement of snowcovered area. Microwave radiation emitted from beneath the snow surface can be sensed and thus permits information on internal snowpack properties to be inferred. The intensity of radiation received is a function of the average temperature and emissivity of the snow layers and is commonly referred to as the brightness temperature (T sub b). The T sub b varies with snow grain and crystal sizes, liquid water content and snowpack temperature. The T sub b of the 0.8 cm wavelength channel was found to decrease moreso with increasing snow depth than the 1.4 cm channel. More scattering of the shorter wavelength radiation occurs thus resulting in a lower T sub b for shorter wavelengths in a dry snowpack. The longer 21.0 cm wavelength was used to assess the condition of the underlying ground. Ultimately it may be possible to estimate snow volume over large areas using calibrated brightness temperatures and consequently improve snowmelt runoff predictions. |
| File Size | 3105774 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790008308 |
| Archival Resource Key | ark:/13960/t1xd5pt0h |
| Language | English |
| Publisher Date | 1978-11-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Microwave Radiometers Characterization Wavelengths Surface Properties Brightness Temperature Snow Cover Spectral Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
