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AMSR-E/Aqua Daily L3 12.5 km Brightness Temperature, Sea Ice Concentration, & Snow Depth Polar Grids
Entry ID: AE_SI12

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Abstract: The Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) instrument on the NASA Earth Observing System (EOS) Aqua satellite, provides global passive microwave measurements of land, ocean, and atmospheric variables for the investigation of water and energy cycles. This Level-3 gridded product (AE_SI12) includes brightness temperatures at 18.7 through 89.0 GHz, sea ice concentration, and snow depth over sea ice. Data are mapped to a polar stereographic grid at 12.5 km spatial resolution. Sea ice concentration and brightness temperatures include daily ascending averages, daily descending averages, and daily averages; snow depth over sea ice data is a five-day running average. Data are stored in HDF-EOS format and are available from 19 June 2002 to present via FTP.
Related URL
Description: AMSR-E web site at NSIDC
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Geographic Coverage
Spatial coordinates   
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1.   N: -39.23   S: -90.0   E: 180.0   W: -180.0  
2.   N: 90.0   S: 30.98   E: 180.0   W: -180.0  

Data Set Citation
Dataset Originator/Creator: Cavalieri, D. J., T. Markus, and J. C. Comiso.
Dataset Title: AMSR-E/Aqua Daily L3 12.5 km Brightness Temperature, Sea Ice Concentration, & Snow Depth Polar Grids
Dataset Release Date: 2003-01-01
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
Version: 2
Online Resource:
Temporal Coverage
Start Date: 2002-06-19
Stop Date: 2011-10-03
Data Resolution
Latitude Resolution: 12.5 km
Longitude Resolution: 12.5 km
Temporal Resolution: 1 day
Quality 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.
Data Set Progress
Data Center
NASA National Snow and Ice Data Center Distributed Active Archive Center Supplemental Info
Data Center URL:

Data Center Personnel
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA
Distribution Media: FTP
Distribution Size: 60 MB
Distribution Format: HDF-EOS
Phone: (301) 614-5901
Fax: (301) 614-5644
Email: donald.j.cavalieri at
Contact Address:
Laboratory for Hydrospheric Processes
NASA/Goddard Space Flight Center
Code 614.1
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
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Cavalieri, D. and J. Comiso. 2000. Algorithm Theoretical Basis Document for the AMSR-E Sea Ice Algorithm, Revised December 1. Landover, MD, USA: Goddard Space Flight Center. Cavalieri, D.J., K.M. St. Germain, and C.T. Swift. 1995. Reduction of weather effects in the calculation of sea ice concentration with the DMSP SSM/I. Journal of Glaciology 41(139): 455-464. Cavalieri, D.J., P. Gloersen, and ... View entire text
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Creation and Review Dates
DIF Creation Date: 2003-01-01
Last DIF Revision Date: 2014-04-04

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