Remote Sensing, Model-Derived and Ground Measurements of Snow Water Equivalent and Snow Density in Alaska
نویسندگان
چکیده
منابع مشابه
Remote Sensing, Model-Derived and Ground Measurements of Snow Water Equivalent and Snow Density in Alaska
Snow water equivalent (SWE) is important for investigations of annual to decadal-scale changes in A and energy-water cycles. Passive microwave satellite-based retrieval algorithm estimates of SWE now sp three decades. SWE retrievals by the Advanced Microwave Scanning Radiometer for the Earth Ob (AMSR-E) onboard the NASA-Aqua satellite ended at October 2011. A critical parameter in the AM gorith...
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An increasing number of satellite sensors operating in the optical and microwave spectral bands represent an opportunity for utilizing multi-sensor fusion and data assimilation techniques for improving the estimation of snowpack properties using remote sensing. In this paper, the strength of a synergistic approach of leveraging optical, active and passive microwave remote sensing measurements t...
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Since 1982, under an agreement between the California Department of Water Resources and the USDA Forest Service, snow sensors have been installed and operated in Forest Service-administered wilderness areas in the Sierra Nevada of California. The sensors are to be removed by 2005 because of the premise that sufficient data will have been collected to allow "correlation" and, by implication, pre...
متن کاملModeling bulk density and snow water equivalent using daily snow depth observations
Bulk density is a fundamental property of snow relating its depth and mass. Previously, two simple models of bulk density (depending on snow depth, date, and location) have been developed to convert snow depth observations to snow water equivalent (SWE) estimates. However, these models were not intended for application at the daily time step. We develop a new model of bulk density for the daily...
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A nonlinear least squares fitting algorithm is used to estimate both snow depth and snow density for a snow-layer above a flat ground reflector. The product of these two quantities, snow depth and density, provides an estimate of the snow water equivalent. The input to this algorithm is a simple ray model that includes a speculary reflected signal along with a direct signal. These signals are t...
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ژورنال
عنوان ژورنال: International Journal of Geosciences
سال: 2012
ISSN: 2156-8359,2156-8367
DOI: 10.4236/ijg.2012.35114