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Background:
Land Information System (LIS) Snow Depth from NASA’s SPoRT Center.
The NASA Short-term Prediction Research and Transition (SPoRT) Center runs the Alaska LIS (LIS-AK), a near-real-time version of the Noah land surface model at 0.03 degree resolution utilizing the NASA Land Information System (LIS) software. The model input is the Global Data Assimilation (GDAS) forcing dataset, which is a near-real-time analysis of various observational data (ground, radar, satellite) consisting of surface meteorology (temperature, humidity, pressure, winds, precipitation) and downwelling long- and short-wave radiation.
Within LIS, the Noah Land Surface Model (LSM) is forced by this input data and produces analyses of soil temperature and moisture in 4 layers plus the snow state and fluxes of energy and water at the surface. The Noah LSM accounts for snow accumulation based on the current LIS snow values in the continuous run and the forcing data from the atmospheric model. Forcing variables influencing the snow depth in LIS include precipitation, air temperature, solar radiation. Relevant modeled processes include compaction of snow, sublimation, and melting.
The Image Service is published using a Raster Mosaic populated with GeoTiffs collected from the Short-term Prediction and Research Transition (SPoRT) FTP sire daily
Data Visualization:
Snow Depth is shown using a Classified Color Ramp (Multi-Color, 16 classes). Snow depth units are inches.
Inaccuracies in the forcing data will result in inaccuracies in model data. Large portions of the state are data-sparse so the GDAS forcing data, and hence the LIS output, may be subject to larger errors than usual. Snow depth in coastal areas is subject to higher error and is often underestimated. In some high-altitude, permanently glaciated areas, the model may accumulate too much snow. The Noah (LSM) used within LIS does not represent snow removal or transport from wind scouring.
Update Frequency:
Daily
Suggested Usage:
Estimating snow depth. Determining snow-free regions. Informing forecasts of future soil moisture, ground water, and streamflow.
Further Reference:
NASA SPoRT Land Information System for Alaska - Starter Guide
Background:
Land Information System (LIS) Snow Depth from NASA’s SPoRT Center.
The NASA Short-term Prediction Research and Transition (SPoRT) Center runs the Alaska LIS (LIS-AK), a near-real-time version of the Noah land surface model at 0.03 degree resolution utilizing the NASA Land Information System (LIS) software. The model input is the Global Data Assimilation (GDAS) forcing dataset, which is a near-real-time analysis of various observational data (ground, radar, satellite) consisting of surface meteorology (temperature, humidity, pressure, winds, precipitation) and downwelling long- and short-wave radiation.
Within LIS, the Noah Land Surface Model (LSM) is forced by this input data and produces analyses of soil temperature and moisture in 4 layers plus the snow state and fluxes of energy and water at the surface. The Noah LSM accounts for snow accumulation based on the current LIS snow values in the continuous run and the forcing data from the atmospheric model. Forcing variables influencing the snow depth in LIS include precipitation, air temperature, solar radiation. Relevant modeled processes include compaction of snow, sublimation, and melting.
The Image Service is published using a Raster Mosaic populated with GeoTiffs collected from the Short-term Prediction and Research Transition (SPoRT) FTP sire daily
Data Visualization:
Snow Depth is shown using a Classified Color Ramp (Multi-Color, 16 classes). Snow depth units are inches.
Inaccuracies in the forcing data will result in inaccuracies in model data. Large portions of the state are data-sparse so the GDAS forcing data, and hence the LIS output, may be subject to larger errors than usual. Snow depth in coastal areas is subject to higher error and is often underestimated. In some high-altitude, permanently glaciated areas, the model may accumulate too much snow. The Noah (LSM) used within LIS does not represent snow removal or transport from wind scouring.
Update Frequency:
Daily
Suggested Usage:
Estimating snow depth. Determining snow-free regions. Informing forecasts of future soil moisture, ground water, and streamflow.
Further Reference:
NASA SPoRT Land Information System for Alaska - Starter Guide