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Old 12th June 2019, 09:50 AM   #1
sphenisc
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2019 Polar Ice Thread

Polar sea ice is set to reach a minimum for the day of the year* in both the Arctic and Antarctic.

https://nsidc.org/arcticseaicenews/c...sea-ice-graph/


1 Is there a word for comparisons across the same day/period? It would be "phenological" in Biology, not sure about Climate Science.

Couldn't find a 2019 version of the previous sea ice threads, if there is one, Mods please move this post.
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Old 14th June 2019, 07:51 AM   #2
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And today it happened.
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Old 12th July 2019, 04:36 AM   #3
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By June 30th, the Arctic sea ice volume was shy above 12,000km3, 1,500 less than the previous year's to date and 200 below 2012's, the year that holds the minimum sea ice area on record.

By July 10th the Arctic sea ice extent was the lowest on record to that specific date, 1.5% lower than that of 2012.

Anyway, the record low of 2012 happened with the contribution of strong winds all around the region during late August and September, which scattered the remaining ice and favoured its melting. Too early to say if something similar and a new record low are going to happen this year.

NOTICE: As it is now a tradition, the scope of this thread is like its predecessors, but dealing with both polar regions. Bear that in mind when posting here.
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Old 7th August 2019, 03:05 PM   #4
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With almost a fourth of the melting season still ahead of us, the Arctic sea ice extent was yesterday covering an area smaller than the yearly record low for every year from 1979 to 2004.

That extent is now 3% smaller than the previous record low to date (2012), and by the last day of July the estimated Arctic sea ice volume was 6,464 cubic kilometres* while last year's was 7,571 and 2012's (the record low) was 6,676, so this year seems to be aiming to a new record low or a close second place.

Yesterday in the Antarctic, the sea ice extent was 0.6% above 2017's, so, second low on record for the date.

(* it was +20,000 by the 1970s-80s. The good news is that, unlike Greenland's Ice Sheet, all the ice lost has a negligible effect on sea level, exclusively caused by subtle changes in salinity)
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Old 7th August 2019, 04:25 PM   #5
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Originally Posted by aleCcowaN View Post
With almost a fourth of the melting season still ahead of us, the Arctic sea ice extent was yesterday covering an area smaller than the yearly record low for every year from 1979 to 2004.

That extent is now 3% smaller than the previous record low to date (2012), and by the last day of July the estimated Arctic sea ice volume was 6,464 cubic kilometres* while last year's was 7,571 and 2012's (the record low) was 6,676, so this year seems to be aiming to a new record low or a close second place.

Yesterday in the Antarctic, the sea ice extent was 0.6% above 2017's, so, second low on record for the date.

(* it was +20,000 by the 1970s-80s. The good news is that, unlike Greenland's Ice Sheet, all the ice lost has a negligible effect on sea level, exclusively caused by subtle changes in salinity)

I would have thought the melting of Arctic sea ice would have no effect on sea level, because it is already floating and thereby displacing as much water as it would if melted. Ice that is land based is a different matter.
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Old 7th August 2019, 05:57 PM   #6
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Originally Posted by Thor 2 View Post
I would have thought the melting of Arctic sea ice would have no effect on sea level, because it is already floating and thereby displacing as much water as it would if melted. Ice that is land based is a different matter.
Salty water and saltier water plus sea ice both coming from the first one don't occupy the same volume. But the difference in sea level is negligible, roughly in the order of 0.1mm for those 14,000 cubic kilometres. If the same amount melts from a continental ice sheet, the sea level would raise some 40mm.

This is a fact not very important, but what everyone should realize is that when sea ice is created from sea water, part of the water ends up above sea level, and that makes for a very small but larger difference.

By the way, I put some famous global warming "advocate" on ignore for good because he once manufactured a long-winded discussion with me about what I've just said being wrong and he wouldn't listen to reason no matter what.
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Old 8th August 2019, 12:17 PM   #7
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Interesting but also depressing thread...
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Old 15th August 2019, 01:26 PM   #8
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The Arctic sea ice extent dropped today below the 5 millions square kilometres mark. With some 30 days of melting left, that value is already below the yearly minimum for years 2014, 2013, 2009, 2008 and all years before 2007.

It all point to this year becoming the second lowest minimum Arctic sea ice extent on record.
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Old 10th September 2019, 11:32 AM   #9
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By August 31st the Arctic sea ice volume had dropped to only 4,170 cubic kilometres (there only was less ice during record year 2012). The sea ice extent was yesterday barely 100,000 km2 above the yearly minimums in 2007 and 2016 but it is unlikely this year is going to break those records.

So this year will end up probably ranking 4th.

That's all folks. aleCcowaN out.
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Old Today, 11:29 AM   #10
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Originally Posted by aleCcowaN View Post
...So this year will end up probably ranking 4th.

That's all folks. aleCcowaN out.
Or is it!?
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Old Today, 01:37 PM   #11
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Looks like it's not done yet
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