Grease ice

Grease ice is a very thin, soupy layer of frazil crystals clumped together, and only formed in large, open bodies of water most notably the ocean.

New sea ice formation takes place throughout the winter in the Arctic, and Antarctic where frazil forms and coalesces in polynyas or in cold-exposed regions of the open-ocean.

Turbulence, caused by strong winds or flow from a river, will mix the supercooled water throughout its entire depth.

Parkinson, Claire L.; Comiso, Josefino C.; Zwally, H. Jay; Cavalieri, Donald J.; Gloersen, Per; Campbell, William J.

(1987), Arctic Sea Ice, 1973-1976: Satellite Passive-Microwave Observations, Washington, DC: NASA Scientific and Technical Information Branch, p. 3, OCLC 14586790 Smedsrud, Lars H.; Skogseth, Ragnheid (2006), "Field Measurements of Arctic Grease Ice Properties and Processes", Cold Regions Science and Technology, 44 (3), Cold Regions Science and Technology 44: 171–183, Bibcode:2006CRST...44..171S, doi:10.1016/j.coldregions.2005.11.002