Data of different satellite sensors are combined to obtain a global data set of the sea ice drift, separately for the northern and southern hemisphere, gridded onto a Lambert-Azimuthal Equal Area Grid with 25 km grid resolution.
Because of the limited availability of the satellite data used, the data set is based on a spatially and temporally varying amount of input data. For the Antarctic, data provided by the Scanning Multichannel Microwave Radiometer (SMMR), the Special Sensor Microwave/Imager (SSM/I) and Imager+Sounder (SSM/IS), and the Advanced Very High Resolution Radiometer (AVHRR) are used. For the Arctic, in addition to the above-mentioned data, data of the Advanced Multichannel Scanning Radiometer (AMSR-E), buoy observations of the International Arctic Buoy Program (IABP), and ice motion derived from NCEP/NCAR surface wind vectors are used.
These are the periods over which the different input data are used:
- AVHRR: 1981-07-24 to 2000-12-31
- SMMR - SSM/I - SSM/IS: 1978-10-21 to 2017-02-28
- AMSR-E: 2002-06-19 to 2011-08-08 (only northern hemisphere)
- IABP buoys: 1979-01-18 to 2017-02-28 (only northern hemisphere)
- NCEP/NCAR: 1979-11-01 to 2017-02-28 (only northern hemisphere)
The documentation on the respective NSIDC web page informs about the methods used.
The figure on top of this page shows to sample maps of the mean annual sea ice drift in the Arctic and Antarctic for the year 1992.
This is version 03 of the NSIDC ice motion data set downloaded in December 2017.
Last update of data set at ICDC: January 19, 2018