Movie:ArcticErosion: Difference between revisions
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{{Attribute movie1 | {{Attribute movie1 | ||
|Movie domain = coastal | |Movie domain=coastal | ||
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{{Attribute movie2 | {{Attribute movie2 | ||
|Movie keywords = Coastal Bluff Erosion | |Movie keywords=Coastal Bluff Erosion | ||
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{{Attribute movie3 | {{Attribute movie3 | ||
|First name contributor=Irina | |First name contributor=Irina | ||
|Last name contributor =Overeem | |Last name contributor=Overeem | ||
|Location movie=Beaufort Coast, Alaska | |Location movie=Beaufort Coast, Alaska | ||
|Timespan movie=July 2-28, 2008 | |Timespan movie=July 2-28, 2008 | ||
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{{Movie description | {{Movie description | ||
|Grade level=Middle (6-8), High (9-12), Under graduate (13-16), Graduate / Professional | |Grade level=Middle (6-8), High (9-12), Under graduate (13-16), Graduate / Professional | ||
|One-line movie description = Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska | |One-line movie description=Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska | ||
|Extended movie description=Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska. Coastal erosion rates exceeding 20 meters per year are being observed along the Arctic Coast, and they are especially high along Alaska’s Beaufort Sea coastline. Comparison of aerial photos and LANDSAT imagery suggest accelerating erosion rates over the last 50 years. Arctic sea ice coverage has been declining dramatically over the last few decades and record September minima were observed in 2007. These observations suggest a causal relationship between sea ice decline and coastal change. The timelapse movies presented here show that the relative roles of thermal and wave energy may be significant. The bluffs consist of silt and have high ice-content. The thawing of the ice-rich bluffs by relatively warm seawater undermines coastal bluffs, leading to topple failures of discrete blocks defined by ice-wedge polygons. The fine-grained nature of these materials does not function as a protective barrier for incoming waves, so there is not a strong negative feedback on erosion rates, so that coastal erosion rates in this setting are likely to increase with continued Arctic warming. | |Extended movie description=Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska. Coastal erosion rates exceeding 20 meters per year are being observed along the Arctic Coast, and they are especially high along Alaska’s Beaufort Sea coastline. Comparison of aerial photos and LANDSAT imagery suggest accelerating erosion rates over the last 50 years. Arctic sea ice coverage has been declining dramatically over the last few decades and record September minima were observed in 2007. These observations suggest a causal relationship between sea ice decline and coastal change. The timelapse movies presented here show that the relative roles of thermal and wave energy may be significant. The bluffs consist of silt and have high ice-content. The thawing of the ice-rich bluffs by relatively warm seawater undermines coastal bluffs, leading to topple failures of discrete blocks defined by ice-wedge polygons. The fine-grained nature of these materials does not function as a protective barrier for incoming waves, so there is not a strong negative feedback on erosion rates, so that coastal erosion rates in this setting are likely to increase with continued Arctic warming. | ||
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Latest revision as of 16:15, 21 June 2017
Information Page: ArcticErosion
Play Movie
Bluff Erosion in the Arctic 2008
Key Attributes
Domain: | coastal |
Keywords: | Coastal Bluff Erosion |
Model name: | Animation model name |
Name: | Irina, Overeem |
Where: | Beaufort Coast, Alaska |
When: | July 2-28, 2008 |
Short Description
Grade level: Middle (6-8), High (9-12), Under graduate (13-16), Graduate / Professional
Statement: Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska
Abstract: Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska. Coastal erosion rates exceeding 20 meters per year are being observed along the Arctic Coast, and they are especially high along Alaska’s Beaufort Sea coastline. Comparison of aerial photos and LANDSAT imagery suggest accelerating erosion rates over the last 50 years. Arctic sea ice coverage has been declining dramatically over the last few decades and record September minima were observed in 2007. These observations suggest a causal relationship between sea ice decline and coastal change. The timelapse movies presented here show that the relative roles of thermal and wave energy may be significant. The bluffs consist of silt and have high ice-content. The thawing of the ice-rich bluffs by relatively warm seawater undermines coastal bluffs, leading to topple failures of discrete blocks defined by ice-wedge polygons. The fine-grained nature of these materials does not function as a protective barrier for incoming waves, so there is not a strong negative feedback on erosion rates, so that coastal erosion rates in this setting are likely to increase with continued Arctic warming.
Theory
Links
References
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