Progress of Iceberg A68 over a 12-month period captured by the European Space Agency Sentinel-1 satellites. The darkening of the images towards the end of the sequence shows how surface melt in the height of the Antarctic summer causes the ice surface to be much less reflective of microwave energy from the satellite.
Stationary white features in the ocean are small (one one or two km across!) icebergs grounded on shallower parts of the sea bed and unable to move with the sea ice which can be seen drifting northward (bottom right to top left) with the Weddell Gyre. Notice how iceberg A68 swept some of these away in January 2019. There is a possibility that A68 will get snagged on the bathymetric high points that grounded those smaller icebergs.
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