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Description

This data set (AE_SI25) reports average daily, 25 km resolution, horizontally and vertically polarized brightness temperatures (Tb) at six frequencies—6.9 GHz, 10.7 GHz, 18.7 GHz, 23.8 GHz, 36.5 GHz, and 89.0 GHz—plus sea ice concentrations and sea ice concentration differences between the Enhanced NASA Team (NT2) algorithm and the legacy AMSR Basic Bootstrap Algorithm (BBA). Data are provided on Northern and Southern Hemisphere, polar stereographic grids.

These data are derived from observations acquired by the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) on board the NASA Aqua satellite.

Version Description

Changes for this version include: * Uses Version 4 of the AMSR-E/Aqua L2A Global Swath Spatially-Resampled Brightness Temperatures as input * NH water filter parameters adjusted to better characterize open water cluster during cold months. This change eliminates ~60% of NH false ice identifications in open ocean during Oct. to May. * Data file format changed to HDF-EOS5.

Product Summary

Platforms
Aqua
Instruments
AMSR-E
Spatial Extent

N: -39.23 S: -90 E: 180 W: -180

,

N: 90 S: 30.98 E: 180 W: -180

Spatial Resolution
25 Kilometers x 25 Kilometers
Spatial Reference System(s)
Multiple EPSG codes (see User Guide)
Location
NORTHERN HEMISPHERE ,
POLAR ,
SOUTHERN HEMISPHERE
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2002-06-01 to 2011-10-04
Temporal Resolution
1 Day
Concept ID
C3628320447-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
3381
Processing Level
3
Published
Science Keywords
Brightness Temperature ,
Sea Ice Concentration

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Markus, T., Comiso, J. C., Boisvert, L., & Meier, W. N. (2025). AMSR-E/Aqua Daily L3 25 km Brightness Temperature & Sea Ice Concentration Polar Grids, Version 4 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/QD0EB4TQGG6A Date Accessed: 2026-09-29

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Publications Citing This Dataset

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Title Authors Year Referenced Datasets
Understanding the Physical Forcings Behind the Biogeochemical
  • Deschepper, Inge, Myers, Paul G., Lavoie, Diane, Papakyriakou, Tim, Maps, Frederic
Snow depth product over Antarctic sea ice from 2002 to 2020 using multisource passive microwave radiometers
  • Shen, Xiaoyi, Ke, Chang-Qing, Li, Haili
Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses
  • Nie, Yafei, Uotila, Petteri, Cheng, Bin, Massonnet, Francois, Kimura, Noriaki, Cipollone, Andrea, Lv, Xianqing
The ice factory of Hudson Bay: Spatiotemporal variability of the Kivalliq Polynya
  • Bruneau, Jennifer, Babb, David, Chan, Wayne, Kirillov, Sergei, Ehn, Jens, Hanesiak, John, Barber, David G.
Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations
  • Kern, Stefan, Lavergne, Thomas, Notz, Dirk, Pedersen, Leif Toudal, Tonboe, Rasmus Tage, Saldo, Roberto, Srensen, Atle MacDonald
Marked decrease in the near-surface snow density retrieved by AMSR-E satellite at Dome C, Antarctica, between 2002 and 2011
  • Champollion, Nicolas, Picard, Ghislain, Arnaud, Laurent, Lefebvre, Eric, Macelloni, Giovanni, Remy, Frederique, Fily, Michel
Snow Depth Retrieval on Arctic Sea Ice From Passive Microwave RadiometersImprovements and Extensions to Multiyear Ice Using Lower Frequencies
  • Rostosky, Philip, Spreen, Gunnar, Farrell, Sinead L., Frost, Torben, Heygster, Georg, Melsheimer, Christian
Seasonal acoustic environments of beluga and bowhead whale core-use regions in the Pacific Arctic
  • Stafford, Kathleen M., Castellote, Manuel, Guerra, Melania, Berchok, Catherine L.
The underwater soundscape in western Fram Strait: Breeding ground of Spitsbergen's endangered bowhead whales
  • Ahonen, Heidi, Stafford, Kathleen M., de Steur, Laura, Lydersen, Christian, Wiig, ystein, Kovacs, Kit M.
On retrieving sea ice freeboard from ICESat laser altimeter
  • Khvorostovsky, Kirill, Rampal, Pierre
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