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Author Topic: Ice Shelves /Ward Hunt Ice Shelf / Ellesmere Island / Canada  (Read 19920 times)

ArcticMelt2

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Re: Ice Shelves /Ward Hunt Ice Shelf / Ellesmere Island / Canada
« Reply #50 on: August 13, 2020, 06:18:50 PM »
McClintock inlet lost a big chunk of ice in your gif too. Though I think that is not a floating ice shelf?

The ice shelf in this bay existed until 1988.


oren

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Re: Ice Shelves /Ward Hunt Ice Shelf / Ellesmere Island / Canada
« Reply #51 on: August 13, 2020, 06:59:20 PM »
Thank you AM2, that's a great map which I've never seen. For some reason I have only been able to view it in maximum size by clicking "open in new tab".

ArcticMelt2

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Re: Ice Shelves /Ward Hunt Ice Shelf / Ellesmere Island / Canada
« Reply #52 on: August 13, 2020, 08:44:50 PM »
Thank you AM2, that's a great map which I've never seen. For some reason I have only been able to view it in maximum size by clicking "open in new tab".

This is a free image from a 2017's paid review.

Changes in Canadian Arctic Ice Shelf Extent Since 1906

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Chapter from book Arctic Ice Shelves and Ice Islands (pp.109-148)
Changes in Canadian Arctic Ice Shelf Extent Since 1906
Chapter · June 2017 with 344 Reads 

By the way, the new ice island is now 70 km away. This would be a great place to set up a new research station or place buoys. Say that the ice there is up to 80-100 meters thick. Such ice islands in the Arctic could be up to 40 years old.

https://en.wikipedia.org/wiki/Fletcher%27s_Ice_Island

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Iceberg T-3 had once been reported to have been identified during World War II, but there are several conflicting reports in regard to when the iceberg was actually "discovered". Concerned about Soviet postwar activities in the Arctic, the U.S. Air Force initiated B-29 reconnaissance flights over the Arctic region beginning in 1946, and, by 1951, the reconnaissance trips to the North Pole were being implemented on daily basis. During the reconnaissance flights, several large icebergs were discovered, and the following year of 1952, the Alaska Air Command established a project in order to establish a weather station on one of the icebergs and conduct geophysical and oceanographic research. Joseph O. Fletcher, who was the Commanding Officer of a U.S. Air Force weather squadron stationed in the Arctic right after the World War II, was placed in charge of the entire project.[4]
...
The station remained active until 1 Oct 1974, and it was last visited in 1979. After being satellite-monitored for over 30 years, the iceberg eventually drifted through the Fram Strait in 1983.

http://www.geo.uib.no/polarhovercraft/uploads/Main/T3_drift_track.jpg

https://eos.org/articles/scientists-rescue-historical-data-taken-on-floating-ice-island

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Researchers set up camp on Fletcher’s Ice Island, also known as T3, during the Cold War as part of a strategic and scientific campaign. The ice island stretched more than 77 square kilometers, an area larger than Manhattan, and its level surface made it ideal for landing aircraft. The U.S. Air Force established a weather station on the island in the 1950s, after first spotting the island on reconnaissance flights in 1946.

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/TR035i002p00293

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Seismic studies were made on Fletcher's Ice Island in the Arctic Ocean fertng June and July, 1952, to determine the thickness and elastic characteristics of this ice body. The thicknesses obtained by these various types of measurement are quite consistent, giving from 160 to 170 ft, corresponding to an average density of about 0.91 gms/cm3, as deduced from the elevations. This value of density was also obtained by direct measurements in the upper 50 ft of ice.

Does anyone know anything about the new ice islands of the 21st century? For example, oh Markham Ice Shelf?
« Last Edit: August 13, 2020, 08:59:57 PM by ArcticMelt2 »

ArcticMelt2

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Re: Ice Shelves /Ward Hunt Ice Shelf / Ellesmere Island / Canada
« Reply #53 on: August 18, 2020, 10:50:27 PM »
Does anyone know anything about the new ice islands of the 21st century? For example, oh Markham Ice Shelf?

Apparently none of the past ice islands in the Arctic have survived to date. Most of them were attributed to the shores of Newfoulden.

The largest part Markham Ice Shelf - M3 ice island reached the Chukchi Sea after 3 years drift, and was probably destroyed during the disastrous 2012 melt season.

Ice island deterioration in the Canadian Arctic: Rates, patterns and model evaluation 2013

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The fifth ice island,'Markham 3' (M3), was also a fragment of the Markham Ice Shelf (Fig. 3.5). This ice island was first accessed on 19 April 2010 at 79°42'N, 106°54'W. The ice island was visited accessed by helicopter on 7 and 13 April 2012 at 72°21'N, 127°29'W, 88 km west of Sachs Harbour, NT. The ice island was surrounded by sea ice and freeboard was < 2-3 m,. Freeboard was difficult to discern as the surrounding sea ice appeared level with the ice island surface (Fig. 3.4, Table 3.2).

ArcticMelt2

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Re: Ice Shelves /Ward Hunt Ice Shelf / Ellesmere Island / Canada
« Reply #54 on: September 03, 2020, 09:48:50 PM »
https://twitter.com/ECCC_CIS/status/1301488882219974661

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We use #RCMsatellites and #Sentinel1 satellites to track the drift of the ice islands that calved off the Milne #IceShelf at the end of July. These ice islands are 55 km² and 24 km² in area with thicknesses up to 80 m. #MilneIceIsland #Arctic #glacier #seaice #Nunavut