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Ice circles tend to rotate even when they form in water that is not moving. The ice circle lowers the temperature of the water around it, which causes the water to become denser than the slightly warmer water around it. The dense water then sinks and creates its own circular motion, causing the ice
109:
Ice discs form on the outer bends in a river where the accelerating water creates a force called 'rotational shear', which breaks off a chunk of ice and twists it around. As the disc rotates, it grinds against surrounding ice — smoothing into a circle. A relatively uncommon phenomenon, one of
33:
199:
in
December 2008 and another one in England in January 2009. An ice disc was observed on the Sheyenne River in North Dakota in December 2013. An ice circle of approximately 15 m (50 ft) in diameter was observed and photographed in Lake Katrine, New York on the
133:' and can cluster together into a pan-shaped formation. If an ice pan accumulates enough frazil ice and the current remains slow, the pan may transform into a 'hanging dam', a heavy block of ice with high ridges and a low centre.
128:
River specialist and geography professor Joe
Desloges states that ice pans are "surface slabs of ice that form in the center of a lake or creek, instead of along the waterâs edge". As water cools, ice crystals form into
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Officials at Baxter State Park in northern Maine shared a photo of an ice disk that's about 30 or 40 feet wide, located in wilderness more than 200 miles north of much larger disk that formed in
Westbrook.
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In
January 2021 a large ice circle was discovered via satellite imagery and on 23 February 2021, an ice disc estimated to be 196â202 metres (643â663 ft) wide was confirmed on the
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An unusual natural phenomenon, ice disks occur in slowly moving water in cold climates and can vary in size, with circles more than 15 metres (49 feet) in diameter observed.
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are a very rare natural phenomenon that occurs in slow moving water in cold climates. They are thin circular slabs of ice that rotate slowly on a body of water's surface.
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Estonia is reported to have had a diameter of over 20 meters, whilst one approximately 298 feet (91 meters) in diameter appeared in
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Artificial ice circles have also been created by cutting a large circle in a sheet of ice. These artificial creations are called "
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242:(just below Tsu Lake). It was estimated to be rotating at approximately 20â25 minutes per rotation.
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219:, Maine, United States drew wide media attention. A smaller disc was reported by park rangers in
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Dorbolo, S; Adami, N.; Dubois, C.; Caps, H.; Vandewalle, N.; Barbois-Texier, B. (2016).
150:. It has been shown that existing ice discs can maintain their rotation due to melting.
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223:, in northern Maine, the same month. In January 2020, an ice disc appeared on the
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940:"Fancy a spin? Quebecers in Abitibi break world record for largest ice carousel"
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On 14 January 2019, an ice disc approximately 298 feet (91 metres) wide on the
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led to a rare sighting of an ice disc on the Snake River on 22 January 2014.
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Tsu Lake ice circle. Taltson River, Northwest
Territories. 23 February 2021.
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868:. Millinocket, Maine: WMTW ABC News. Associated Press. 18 January 2019
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Giant spinning ice circle discovered in North Dakotaâs
Sheyenne River
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the earliest recordings is of a slowly revolving disc spotted on the
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364:"Spinning ice disc phenomenon seen in British river for first time"
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971:"Eisscheibe beim Kunsthof Pösling (Ice slab at Kunsthof Pösling)"
922:"Mainers Create World's Largest (So They Say) Ice Merry-Go-Round"
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840:"Onlookers share theories, find meaning in giant Maine ice disc"
370:. Telegraph Media Group Limited. 13 January 2009. Archived from
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Theories abound on how the river got those patterns â MIT News
610:"Maine River's Massive Disk of Spinning Ice a Sight to Behold"
792:"Ice disk mania draws crowds, boosts business in Westbrook"
866:"Westbrook isn't the only place in Maine with an ice disk"
69:
image showing the rotation of the large ice circle on the
998:
537:"Rotation of melting ice disks due to melt fluid flow"
762:"Ice disc brings touch of Scandinavia to Devon river"
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910:(K. Cox, personal communication, 23 February 2021).
506:"Crop Circles in the Ice: How Do Ice Circles Form?"
305:"Ice pancakes float along a river in the Highlands"
452:Scroggins, Kate; Roberts, Rob (18 December 2008).
485:"Perfect "Ice Circle" Forms near Toronto, Canada"
439:"Perfect "Ice Circle" Forms near Toronto, Canada"
454:"Man stumbles on round, spinning 'creek circle'"
191:Ice discs have most frequently been observed in
891:"Ice disk appears in the big eddy in Skowhegan"
195:and North America. An ice disc was observed in
723:JÀÀratas pöörlemas Vana-Vigalas â mitte ainult
683:Unusual ice circle forms in North Dakota river
1014:
814:"Massive spinning ice disc forms in US river"
736:"Massive spinning ice disc forms in US river"
8:
658:"Giant ice circle spinning in Esopus Creek"
331:"VIDEO: Moscow Ice Disk a rarity of nature"
1312:
1021:
1007:
999:
57:Ice circles on the Doncaster River, Quebec
49:(Estonia) filmed by a drone, January 2019.
552:
27:Rotating slab of ice on slow-moving water
146:It is believed that ice circles form in
973:(in German). YouTube. 18 January 2009.
636:"Rare Sighting of an Ice Disk in Idaho"
296:
278:- Rotating floating circular island in
989:Video of ice disc in Ontario, Canada:
358:
356:
977:from the original on 15 December 2021
7:
1623:
692:, 26 November 2013, Associated Press
329:Patrick Garrity (7 February 2010).
286:, consisting of vegetation and soil
114:and reported in an 1895 edition of
512:. 22 December 2015. Archived from
204:around 23 January 2014. In Idaho,
25:
634:Daniel Ostler (26 January 2014).
1633:
1622:
1612:
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794:. WMTW ABC News. 19 January 2019
393:Bates, J. M. (9 February 1895).
483:Joe Desloges (8 January 2009).
460:. National Post. Archived from
437:Joe Desloges (8 January 2009).
427:, page 190. Rough Guides, 2000.
992:"Rattray Marsh "Creek Circle""
968:Video of ice disc in Germany:
725:kylauudis.ee, 11. jaanuar 2017
1:
942:. CBC News. 11 December 2019.
994:. YouTube. 13 December 2008.
712:, 26 November 2013, GrindTV
1696:
571:10.1103/PhysRevE.93.033112
249:
1606:
1418:Short-track speed skating
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169:Ice Circle of Vana-Vigala
688:11 December 2014 at the
335:Burlington FreePress.com
708:25 January 2015 at the
231:, Maine, United States
395:"A revolving ice cake"
246:Artificial ice circles
188:
74:
58:
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425:Unexplained Phenomena
240:Northwest Territories
186:
64:
56:
44:
1514:Iceman (occupation)
646:on 2 February 2014.
614:The Weather Channel
563:2016PhRvE..93c3112D
464:on 6 September 2010
399:Scientific American
117:Scientific American
1066:Crystalline phases
608:MacFarlane, Drew.
423:Rickard, B et al:
374:on 19 January 2009
189:
159:circle to rotate.
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1628:Wikimedia Commons
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846:. 15 January 2019
844:Bangor Daily News
820:. 16 January 2019
772:. 14 January 2009
742:. 16 January 2019
681:Blake Nicholson,
221:Baxter State Park
213:Presumpscot River
175:in January 2019.
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16:(Redirected from
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179:Notable examples
173:Westbrook, Maine
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1054:Major phases
979:. Retrieved
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541:Phys. Rev. E
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372:the original
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339:the original
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314:18 September
312:. Retrieved
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284:ParanĂĄ Delta
255:
252:Ice carousel
233:
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202:Esopus Creek
190:
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112:Mianus River
108:
93:
90:ice pancakes
89:
85:
81:
77:
76:
71:Esopus Creek
47:Vigala river
45:Ice disk on
29:
1593:Pleistocene
1307:Ice-related
1218:Frost heave
1152:Stalactites
579:2268/195696
409:30 November
345:19 February
193:Scandinavia
82:ice circles
73:in New York
1654:Categories
1639:Wiktionary
1583:Glaciology
1538:Other uses
1408:Ice racing
1403:Ice hockey
1378:Iceboating
1309:activities
1080:Formations
1071:Superionic
926:Wonderland
896:23 January
872:19 January
850:16 January
824:16 January
798:19 January
746:16 January
667:16 January
554:1510.06505
547:(3): 1â5.
520:16 January
490:14 January
468:29 October
450:cited in:
444:14 January
291:References
142:Conditions
131:frazil ice
94:ice crepes
1665:Water ice
1350:Sculpture
1166:Phenomena
770:The Times
595:118380381
280:Argentina
270:Foam line
229:Skowhegan
217:Westbrook
137:Formation
105:Ice discs
78:Ice discs
1675:Vortices
1617:Category
1575:Ice ages
1529:YakhchÄl
1509:Icehouse
1335:Climbing
1330:Blocking
1325:Blasting
1243:Hair ice
1193:Crystals
981:27 April
975:Archived
818:BBC News
776:22 April
740:BBC News
706:Archived
686:Archived
619:18 March
587:27078452
378:22 April
309:BBC News
264:See also
124:Ice pans
86:ice pans
18:Ice disc
1680:Circles
1499:Cutting
1473:Pykrete
1393:Cycling
1388:Curling
1383:Cricket
1355:Skating
1345:Rafting
1340:Fishing
1320:Bathing
1263:Nucleus
1248:Jacking
1227:sea ice
1225: (
1157:Volcano
1121:calving
1119: (
1117:Iceberg
1112:Glacier
559:Bibcode
405:(6): 86
154:Physics
1632:
1621:
1610:
1504:Icebox
1463:Palace
1448:Bridge
1365:Sports
1283:Slurry
1258:Needle
1208:Frazil
1127:Icicle
1087:Anchor
593:
585:
276:El Ojo
1555:Cream
1545:Chips
1524:Trade
1458:Igloo
1453:Hotel
1373:Bandy
1298:Storm
1288:Slush
1278:Shuga
1273:Shove
1233:Glaze
1213:Frost
1188:Clear
1178:Black
1147:Spike
1142:Sheet
1107:Field
1047:water
1043:state
1040:solid
591:S2CID
549:arXiv
197:Wales
100:Types
1565:Pack
1560:Cube
1550:Core
1519:Pick
1492:Work
1483:Road
1478:Rink
1468:Pier
1293:Snow
1268:Rime
1253:Névé
1238:Hail
1198:Firn
1102:Dune
1097:Cave
1038:The
983:2010
898:2020
874:2019
852:2019
826:2019
800:2019
778:2010
748:2019
669:2019
621:2019
583:PMID
522:2019
492:2009
470:2010
446:2009
411:2013
380:2010
347:2010
316:2021
163:Size
1443:Bar
1203:Fog
1137:Sea
1132:Jam
1092:Cap
1045:of
1030:Ice
575:hdl
567:doi
282:'s
227:in
215:in
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