Sea ice is formed from ocean water that freezes, whether along coasts or to the sea floor (fast ice) or floating on the surface (drift ice) or packed together (pack ice). The most important areas of pack ice are the polar ice packs. Because of vast amounts of water added to or removed from the oceans and atmosphere, the behavior of polar ice packs have a significant impact on the global changes in climate.
Sentinel satellite captures birth of behemoth iceberg
12 July 2017
Over the last few months, a chunk of Antarctica's Larsen C ice shelf has been hanging on precariously as a deep crack cut across the ice. Witnessed by the Copernicus Sentinel-1 mission, a lump of ice more than twice the size of Luxembourg has now broken off, spawning one of the largest icebergs on record and changing the outline of the Antarctic Peninsula forever.
The fissure first appeared several years ago, but seemed relatively stable until January 2016, when it began to lengthen.
In January 2017 alone it travelled 20km, reaching a total length of about 175km.
After a few weeks of calm, the rift propagated a further 16km at the end of May, and then extended further at the end of June.
More importantly, as the crack grew, it branched off towards the edge of the shelf, whereas before it had been running parallel to the Weddell Sea.
With just a few km between the end of the fissure and the ocean by early July, the fate of the shelf was sealed.
Related Data Types
Related (Key) Documentation