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pottyprof

Antarctic Ice Discussion

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I see Ross Ice Shelf is in the news.

I get worried when I see a shelf the size of France making the news because we underestimated its basal melt rates( in it NW sector) by over 10 times its true losses!

In the noughties radar studies noted 'rucks' in the ice layers suggesting it grounded suddenly when it last formed. This would suggest fantastic back pressure from the ocean terminating glaciers behind.

As such there must be a 'break point' where enough contact with the ocean floor is lost as to allow it to surge forward and break its contact with the ground and so 'float off' on mass.

This would lead to a rapid, nay Larsen-esque, breakup of the shelf and the massive impact such would drove for the planet least of which would be the acceleration in the rate West Antarctica shed its ice via ocean terminating glaciers under gravity and Marine Ice Cliff Instability (M.I.C.I.)

Edited by Gray-Wolf

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Have we really gone from record high Antarctic sea ice to record low Antarctic sea ice in just 5 years as NASA claim or has something changed in the way sea ice extent is recorded?

Edited by Mucka

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3 hours ago, Mucka said:

Have we really gone from record high Antarctic sea ice to record low Antarctic sea ice in just 5 years as NASA claim or has something changed in the way sea ice extent is recorded?

that is correct. See the video I posted in the reports thread as it is touched upon there

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Scientists head to Antarctica’s Thwaites Glacier

Nearly 100 scientists and support staff depart this week (13 November 2019) for the most ambitious mission to date for Thwaites Glacier in West Antarctica. In the second year of the International Thwaites Glacier Collaboration (ITGC), researchers from the United States (US) and United Kingdom (UK) will work in one of the most remote and inhospitable areas on Earth. It’s a five-year quest to understand the glacier and surrounding ocean system and its future contribution to global sea level.

Thwaites Glacier, covering 192,000 square kilometers (74,000 square miles)—an area the size of Great Britain—is particularly susceptible to climate and ocean changes. Over the past 30 years, the amount of ice flowing out of the region has nearly doubled. Computer models show that over the next several decades, the glacier may lose ice even more rapidly, as ice retreat progresses. Already, ice draining from Thwaites into the Amundsen Sea accounts for about four percent of global sea level rise. A collapse of the glacier would lead to a significant increase in sea levels of around 65cm (25 inches) over the coming centuries.

https://www.bas.ac.uk/media-post/scientists-head-to-antarcticas-thwaites-glacier/

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New high-precision map of Antarctica’s bed topography

Quote

A team of glaciologists has unveiled the most accurate portrait yet of the contours of the land beneath Antarctica’s ice sheet – and, by doing so, has helped identify which regions of the continent are going to be more, or less, vulnerable to future climate warming.

https://www.bas.ac.uk/media-post/new-high-precision-map-of-antarcticas-bed-topography/

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On ‎07‎/‎02‎/‎2020 at 14:02, Gray-Wolf said:
PUBLIC.WMO.INT

The Argentine research base, Esperanza, on the northern tip of the Antarctic peninsula, set a new record temperature of 18.3°C on 6 February, beating the former...

 

Esperanza is 2000 miles away from the south pole , that would be the north pole equivalent to Oslo , which has an average summer temperature of 17.5°C (64°F) ,but  have been known to climb above 80 degrees Fahrenheit (27 degrees Celsius), as for the Esperanza temperature , a higher temperature of 19.8 Celsius ( 67.6 Fahrenheit) was recorded at Signy research station on January 30th 1982

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if you look at the difference ( which is very easy using Ventusky.com  ) you will see the temperature difference between the peninsula and the main body of the continent , even in summer is vast .

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