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Mesoscale monitoring of the soil freeze/thaw boundary from orbital microwave radiometry (Document No: 19880010471)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ulaby, Fawwaz T. Dobson, M. Craig Kuhn, William R. |
| Copyright Year | 1988 |
| Description | The fundamental objectives are to test the feasibility of delineating the lateral boundary between frozen and thawed condition in the surface layer of soil from orbital microwave radiometry and secondly to examine the sensitivity of general circulation models to an explicit parameterization of the boundary condition. Physical models were developed to relate emissivity to scene properties and a simulation package was developed to predict brightness temperature as a function of emissivity and physical temperature in order to address issues of heterogeneity, scaling, and scene dynamics. Radiative transfer models were develped for both bare soil surfaces and those obscured by an intervening layer of vegetation or snow. These models relate the emissivity to the physical properties of the soil and to those of the snow or vegetation cover. A SMMR simulation package was developed to evaluate the adequacy of the emission models and the limiting effects of scaling for realistic scenarios incorporating spatially heterogeneous scenes with dynamic moisture and temperature gradients at the pixel scale. |
| File Size | 283614 |
| Page Count | 7 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880010471 |
| Archival Resource Key | ark:/13960/t1vf1qp48 |
| Language | English |
| Publisher Date | 1988-01-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Boundary Value Problems Melting Boundary Conditions Freezing Microwave Radiometers Temperature Measurement Satellite Imagery Permissivity Emissivity Algorithms Vegetation Mathematical Models Brightness Temperature Snow Cover Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
