Arctic Sea Ice : Forum

Cryosphere => Arctic background => Topic started by: Pmt111500 on March 07, 2017, 09:35:32 AM

Title: On arctic and global climate change by Dr Jim White
Post by: Pmt111500 on March 07, 2017, 09:35:32 AM
Posting this here too, probably this is already referred to somewhere else on the site too. A state of the art public and general lecture on state of climate change study and on metastable icy regions of the planet. Dr. Jim White speaks.

https://youtu.be/YPqEc1rQvvg

Are we turning to the tailwind or are we on the last turn before that on this climatic journey on spaceship earth?
Title: Re: On arctic and global climate change by Dr Jim White
Post by: Hefaistos on March 07, 2017, 09:01:55 PM
Thanks for the link, very good lecture with several fascinating graphs.

I especiall liked what he talked about the relation between temperature change and sea level, where on the long term a one degree C change translates into 20 meters of sea level change.

The total amplitude for sea level change is about 200 meter, and the total amplitude for average earth temperature is about 10 degrees C, that's how he gets the 20 meters per one degree C.
This of course is the long term steady state, and it basically means that we have already locked in our first 20 meters of sea level rise, given that earth av. temperature has risen about 1 C. He claims that about 14 meters of marine-based ice is 'meta-stable' in W.Antarctica.

He start to talk about this at around 1.02

At 1.18 he comes into the speed of SLR, and says that what we're currently seeing, is rather small in comparison to SLR that was e.g. around 15 ka ago
Title: Re: On arctic and global climate change by Dr Jim White
Post by: Adam Ash on March 09, 2017, 07:35:34 AM
Thanks for the link.

In the same vein, I found this talk interesting too.

Seven surprising results from the reduction of Arctic Sea ice cover | David Barber | TEDxUManitoba

https://www.youtube.com/watch?v=ofaoiHYKtlc (https://www.youtube.com/watch?v=ofaoiHYKtlc)

Especially the discussion on the new type of ice: Rotten Ice (at about 7:40) "..this rotten ice is [now] pervasive in the summer."




Title: Re: On arctic and global climate change by Dr Jim White
Post by: longwalks1 on March 11, 2017, 05:40:55 PM
Another one by Dr. Jim White
https://www.youtube.com/watch?v=u6RzAblnmhU (https://www.youtube.com/watch?v=u6RzAblnmhU)
AGU 2014 Nye Lecture 
Abrupt Climate Change: Past, Present and Future
Space And Intelligence

Unfortunately it went into the wrong thread Re: The 2016/2017 freezing season Reply 2948 and little attribution given. Reply 2949 did not help.  Yes, mea culpa, I was out of line for comment 2973.  Thanks for starting this thread.

He also goes by Dr. James White.
http://instaar.colorado.edu/people/james-w-c-white/ (http://instaar.colorado.edu/people/james-w-c-white/)