Abstract: The polar sea-ice has an indicative function on the global climate changes. Monitoring of the Arctic sea-ice is of great significance for the study of global climate environment changes. On the basis of IMB data which was acquired at the long-term ice station during the CHINARE-2008 and MODIS images, the Arctic sea-ice motion and changes were investigated. The results showed that better effect was gained while using MODIS images. The boundaries between water and ice were clear on the classified images. The sea-ice concentration decreased from 16 to 30 April. While the long-term ice station drifted from northwest to southeast, sea ice broke gradually. Sea-ice concentration dropped, and the speed of sea-ice continually decreased. During the period between 30 April and 19 May, the sea-ice concentration changed sharply. Especially on 8 May, it increased. According to the analysis of the track, rotations of the sea-ice introduced by strong wind and ocean current and so on, might result in the change. From 19 May to 6 July, the sea-ice concentration increased. There was a phenomenon of sea-ice gathering because of topography effect near the Greenland. So the sea-ice concentration showed a rising trend in this area.

Key words: sea-ice concentration, sea-ice motion, MODIS image, ice buoy, Arctic