Polynya


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Polynya

 

an area of open water in the sheet ice of a river or in the floating ice fields of a sea or lake. Polynyas form in rivers where there is a rapid current or where groundwater seeps into the river. They also form in tail waters. In addition, they form where warm water from industrial enterprises is emptied into a river and at the source of a river that originates in a lake, where the ice is broken up by the river’s movement. This is characteristic of seas, where polynyas are formed primarily by the wind.

References in periodicals archive ?
Polynyas can have big impacts on local climate and on the generation of sea ice in winter.
How do polynyas, sea ice, and ice sheets weave together?
Back in Antarctica, the story told by the MSA concentrations in Criscitiello's ice-sheet records has bolstered her confidence that ice-core records from this dynamic region may provide a reliable proxy for reconstructing how sea ice and polynyas in the Amundsen Sea and Pine Island Bay have varied in the era before satellites.
The considerable number of large S-shaped and circular shelter walls, which could hide hunting parties scanning the polynya for game, the large number and sizes of the meat caches and the number of dwellings and shelters side by side reflect the presence of large groups of hunters and families on the island, at least periodically.
It was of crucial importance to the Thule culture that collective hunting of walrus in the Sirius Water Polynya resulted in full meat and blubber caches at Walrus Island.
The combined effect of low temperatures and insufficient wind may have diminished or even closed the Sirius Water Polynya and thus removed a vital 'stepping stone' for the High Arctic hunters relying on access to highly concentrated marine resources (Kroon et al.
Gate, Novaya Zemlya, High Arctic Islands and Shelf, and Great Siberian Polynya
Some whales may migrate south along the west coast of Greenland (Kapel, 1985) while others may overwinter in polynyas and flaw zones within the pack ice (Reeves et al.
A portion of the population overwinters in the upper Bay in leads and polynyas formed near islands (Low, 1906; Ross, 1975; Reeves and Mitchell, 1987).
This stock is widely distributed in the central and western Bering Sea in winter (November to April), generally associated with the marginal ice front, and found near the polynyas of St.
The view that turbulence from leads and polynyas affect only the boundary layer needs modifying;' Schnell said.
One of these polynyas that supported a population of emperor penguins throughout the last ice age was probably in the Ross Sea.