It would appear that similar ice ring formations have been observed in the past. A web search revealed the even more extensive patterns of ice circles were observed to have developed on Lake Ontario during the winter of 2007. Whether the two possible mechanisms based upon observations of ice-rings on the Central Park Reservoir, suggested in previous blogs, would apply to those observed on Lake Ontario is not known. The pictures posted were insufficiently clear to be able to say whether their origins might be similar. Whatever might be the explanation for their initiation and development these curious circles of ice represent a fascinating natural phenomenon that would seem to warrant further more detailed investigation.
If you would like to see the pictures of the ice rings on lake Ontario go to:
http://www.wkbw.com/younews/14298812.html
which was posted by DUSTY41 24th January 2008. Or for a reproduction see ice-rings
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