| Added | Thu, 22/12/2022 |
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"Finger rafting process" or Finger rafting it develops in the ice cover as a result of the compression regime established in the ice plane.
When two sites of sea ice approach, one of them smoothly slides over the other (moves) at a given distance, which leads to a local increase in the thickness of the ice. The term refers to the systematic alternation of interconnected "thrusts" and "sub-thrusts" from the ice pads involved in this process. This pattern got its name because of the similarity with the interlacing of fingers.
The resulting shapes are most noticeable when the process affects new young ice, but also occurs in ice of any thickness. The process of finger fusion is usually observed inside the leash after the formation of a thin layer of ice.
An idealized three-dimensional representation of finger rafting. This happens when two thin ice sheets converge towards each other.
An aerial view showing two thin ice sheets moving towards each other. Along the length of the contact between the two sheets, the areas where one sheet climbs onto the other alternate with the others, and vice versa.
The lighter areas are places where the thickness of the ice has doubled due to the superposition process. This scheme is known as rafting. In many cases, it is systematic.
Finger rafting in the Weddell Sea, photo of Operation IceBridge , 2017
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