Abstract: The Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) instrument on the NASA EOS Aqua satellite provides global passive microwave measurements of terrestrial, oceanic, and atmospheric variables for the investigation of global water and energy cycles.
These near real-time (NRT) products are generated within 3 hours of the last observations in the file, by the Land ... Atmosphere Near real-time Capability for EOS (LANCE) at the AMSR-E Science Investigator-led Processing System (AMSR-E SIPS). The AMSR-E/Aqua Level-3 25 km daily sea ice product includes 6.9 - 89.0 GHz TBs and sea ice concentration averages (daily, ascending, and descending) on a 25 km polar stereographic grid, generated by the NT2 algorithm using Level-2A TBs. Data are stored in HDF-EOS format, and are available via FTP from the LANCE system.
If data latency is not a primary concern, please consider using science quality products. Science products are created using the best available ancillary, calibration and ephemeris information. Science quality products are an internally consistent, well-calibrated record of the Earth's geophysical properties to support science. Science quality AMSR-E products are available from NSIDC DAAC.
Horizontal Resolution Range:
10 km - < 50 km or approximately .09 degree - < .5 degree
Temporal Resolution Range:
Daily - < Weekly
Differences between the LANCE NRT and standard products are currently under investigation. Known, but not yet quantified, differences include • the ephemeris files (LANCE uses predicted ephemeris and standard products use definitive ephemeris) and • standard product generation includes more sophisticated, dynamic cross calibration and ... geolocation processes.
Weather filters are employed for the Level-3 sea ice products to eliminate spurious sea ice concentrations over open ocean resulting from varying atmospheric emission. The weather filters are based on threshold values for the spectral gradient radio and thresholds derived from TB differences. Sea ice products are checked to see if ice concentration values fall within reasonable limits. Diagnostics are based in part on satellite sea ice climatology developed since the Scanning Multichannel Microwave Radiometer (SMMR) era in 1978.
You must register using the EOSDIS User Registration System in order to access LANCE NRT AMSR-E data. You can register at https://users.eosdis.nasa.gov/urs/.
GHRC User Services Office
Global Hydrology Resource Center (GHRC)
320 Sparkman Drive
Province or State:
Postal Code: 35805
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