On Monday, 11 July from 3:00 p.m. through Wednesday, 13 July until 5:00 p.m. (USA Mountain Time), NSIDC data distribution, services, and Web site will be unavailable to accommodate a major upgrade to our data center. We apologize for any inconvenience this may cause you. Need to talk to us? You can always contact our friendly User Services Office at firstname.lastname@example.org or + 1 303.492.6199.
Buoy locations from the International Arctic Buoy Programme (IABP) "C" data set were interpolated to six-hour intervals on the 25 km EASE-Grid. Using the 12:00 GMT positions, the distance the buoys traveled in a 24-hour period were calculated. The number of buoys and their locations varies from year to year, but the maximum number is about 30 buoys. Usually these buoys are widely spaced; very few are placed in the Eastern Arctic.
The following image shows ice motion from buoys on 20 April 2000.
Daily-averaged ice motion vectors from buoys
It is difficult to assign an error value to a buoy velocity. The position accuracy of the buoys is about 0.5 km. The locations are interpolated to the 6-hour interval times. The accuracy is then dependent upon the initial position error and the interpolation error. It could be assumed that the overall error would be less than 1 cm/sec for the average velocity over 24-hours.