Microwave snow emission modeling uncertainties in boreal and subarctic environments
نویسندگان
چکیده
منابع مشابه
Snow Microwave Emission Modeling of Ice Lenses within the Snowpack Using the Microwave Emission Model for Layered Snowpacks (MEMLS)
Ice lens formation, which follows rain on snow events or melt-refreeze cycles in winter and spring, is likely to become more frequent as a result of increasing mean winter temperatures at high latitudes. These ice lenses significantly affect the microwave scattering and emission properties and, hence, snow brightness temperatures that are widely used to monitor snow cover properties from space....
متن کاملPUBLISHED BY THE AMERICAN GEOPHYSICAL UNION Coupling the snow thermodynamic model SNOWPACK with the microwave emission model of layered snowpacks for subarctic and arctic snow water equivalent retrievals
[1] Satellite-passive microwave remote sensing has been extensively used to estimate snow water equivalent (SWE) in northern regions. Although passive microwave sensors operate independent of solar illumination and the lower frequencies are independent of atmospheric conditions, the coarse spatial resolution introduces uncertainties to SWE retrievals due to the surface heterogeneity within indi...
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Satellites with microwave sensors onboard observing land surface from space consist of signal contributions from surface and atmosphere. The upwelling microwave signals are less attenuated by the atmosphere hence, for earthly located features remote sensing satellite microwave sensors have an advantage over visible sensor systems. In order to monitor snow cover with passive microwave data, brig...
متن کاملModeling the Observed Microwave Emission from Shallow Multi-Layer Tundra Snow Using DMRT-ML
The observed brightness temperatures (Tb) at 37 GHz from typical moderate density dry snow in mid-latitudes decreases with increasing snow water equivalent (SWE) due to volume scattering of the ground emissions by the overlying snow. At a certain point, however, as SWE increases, the emission from the snowpack offsets the scattering of the sub-nivean emission. In tundra snow, the Tb slope rever...
متن کاملSubarctic Boreal Forest Albedo Estimation Using Envisat/asar and Spot
Optical satellite albedo observations of forests suffer from understory contamination, but C-band microwave reacts mostly with the canopy. This paper studies whether or not adding ASAR backscattering information could enhance optical albedo retrieval accuracy. We compare SPOT-4-retrieved reflectances combined with ASAR backscattering ratios with solely optically retrieved SPOT-4 NIR albedo, and...
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ژورنال
عنوان ژورنال: The Cryosphere
سال: 2016
ISSN: 1994-0424
DOI: 10.5194/tc-10-623-2016