Date: 15/06/2018 14:29:13
From: PermeateFree
ID: 1240071
Subject: Antarctic ice loss and sea level rise rates have tripled since 2012

Not so much about the amount of change, but the accelerating speed of change.

>>An international team of scientists from over 40 organizations around the world has completed the most comprehensive assessment of how Antarctica’s ice mass is changing – and as expected, the results are worrying. The Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) shows that the rate of ice loss – and the resulting sea level rise – has tripled since 2012, compared to a more steady rate over the last 25 years.>>

https://newatlas.com/imbie-antarctic-ice-loss-accelerating/55035

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Date: 15/06/2018 14:52:42
From: mollwollfumble
ID: 1240074
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

PermeateFree said:


Not so much about the amount of change, but the accelerating speed of change.

>>An international team of scientists from over 40 organizations around the world has completed the most comprehensive assessment of how Antarctica’s ice mass is changing – and as expected, the results are worrying. The Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) shows that the rate of ice loss – and the resulting sea level rise – has tripled since 2012, compared to a more steady rate over the last 25 years.>>

https://newatlas.com/imbie-antarctic-ice-loss-accelerating/55035

Read article.

We can’t get a really reliable measurement of Antarctic melting rates until the satellite IceSat-2 goes up. That’s due for launch September 2018.

The old IceSat is actually pretty unreliable – I compared it with other measurements of Antarctic ice-sheet altitudes and there were substantial errors. Most of the other satellites that have looked at ice sheet altitudes have used binocular vision, which fails spectacularly on featureless terrain such as ice. Also, most other satellites haven’t gone to high latitudes, they can only see what is happening around the fringes. The Japanese spacecraft data has the best resolution but is too expensive to buy in bulk for any but billionaires, even ten square km of data costs hundreds of thousands of dollars to purchase.

To cut a long story short, wait until IceSat 2. We’ll have extremely reliable values then.

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Date: 15/06/2018 15:03:21
From: PermeateFree
ID: 1240077
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

mollwollfumble said:


PermeateFree said:

Not so much about the amount of change, but the accelerating speed of change.

>>An international team of scientists from over 40 organizations around the world has completed the most comprehensive assessment of how Antarctica’s ice mass is changing – and as expected, the results are worrying. The Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) shows that the rate of ice loss – and the resulting sea level rise – has tripled since 2012, compared to a more steady rate over the last 25 years.>>

https://newatlas.com/imbie-antarctic-ice-loss-accelerating/55035

Read article.

We can’t get a really reliable measurement of Antarctic melting rates until the satellite IceSat-2 goes up. That’s due for launch September 2018.

The old IceSat is actually pretty unreliable – I compared it with other measurements of Antarctic ice-sheet altitudes and there were substantial errors. Most of the other satellites that have looked at ice sheet altitudes have used binocular vision, which fails spectacularly on featureless terrain such as ice. Also, most other satellites haven’t gone to high latitudes, they can only see what is happening around the fringes. The Japanese spacecraft data has the best resolution but is too expensive to buy in bulk for any but billionaires, even ten square km of data costs hundreds of thousands of dollars to purchase.

To cut a long story short, wait until IceSat 2. We’ll have extremely reliable values then.

>>An international team of scientists from over 40 organizations around the world has completed the most comprehensive assessment of how Antarctica’s ice mass is changing – and as expected, the results are worrying. <<

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Date: 15/06/2018 15:06:01
From: Cymek
ID: 1240079
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

PermeateFree said:


mollwollfumble said:

PermeateFree said:

Not so much about the amount of change, but the accelerating speed of change.

>>An international team of scientists from over 40 organizations around the world has completed the most comprehensive assessment of how Antarctica’s ice mass is changing – and as expected, the results are worrying. The Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) shows that the rate of ice loss – and the resulting sea level rise – has tripled since 2012, compared to a more steady rate over the last 25 years.>>

https://newatlas.com/imbie-antarctic-ice-loss-accelerating/55035

Read article.

We can’t get a really reliable measurement of Antarctic melting rates until the satellite IceSat-2 goes up. That’s due for launch September 2018.

The old IceSat is actually pretty unreliable – I compared it with other measurements of Antarctic ice-sheet altitudes and there were substantial errors. Most of the other satellites that have looked at ice sheet altitudes have used binocular vision, which fails spectacularly on featureless terrain such as ice. Also, most other satellites haven’t gone to high latitudes, they can only see what is happening around the fringes. The Japanese spacecraft data has the best resolution but is too expensive to buy in bulk for any but billionaires, even ten square km of data costs hundreds of thousands of dollars to purchase.

To cut a long story short, wait until IceSat 2. We’ll have extremely reliable values then.

>>An international team of scientists from over 40 organizations around the world has completed the most comprehensive assessment of how Antarctica’s ice mass is changing – and as expected, the results are worrying. <<

Probably stooges of big something

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Date: 15/06/2018 15:52:34
From: mollwollfumble
ID: 1240096
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

Not stooges. The results are probably correct. It’s just that there’s a big uncertainty. For instance the abstract of the paper that is being referred to:
https://www.nature.com/articles/s41586-018-0179-y.epdf
says that for East Antarctica the average rate of ice mass gain is 5 +- 46 billion tonnes per year.

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Date: 15/06/2018 15:54:35
From: The Rev Dodgson
ID: 1240099
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

mollwollfumble said:

Read article.

We can’t get a really reliable measurement of Antarctic melting rates until the satellite IceSat-2 goes up. That’s due for launch September 2018.

The old IceSat is actually pretty unreliable – I compared it with other measurements of Antarctic ice-sheet altitudes and there were substantial errors. Most of the other satellites that have looked at ice sheet altitudes have used binocular vision, which fails spectacularly on featureless terrain such as ice. Also, most other satellites haven’t gone to high latitudes, they can only see what is happening around the fringes. The Japanese spacecraft data has the best resolution but is too expensive to buy in bulk for any but billionaires, even ten square km of data costs hundreds of thousands of dollars to purchase.

To cut a long story short, wait until IceSat 2. We’ll have extremely reliable values then.

It seems incredible that the means to get reliable information on this have not been in place years before now.

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Date: 15/06/2018 16:00:51
From: Cymek
ID: 1240104
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

The Rev Dodgson said:


mollwollfumble said:

Read article.

We can’t get a really reliable measurement of Antarctic melting rates until the satellite IceSat-2 goes up. That’s due for launch September 2018.

The old IceSat is actually pretty unreliable – I compared it with other measurements of Antarctic ice-sheet altitudes and there were substantial errors. Most of the other satellites that have looked at ice sheet altitudes have used binocular vision, which fails spectacularly on featureless terrain such as ice. Also, most other satellites haven’t gone to high latitudes, they can only see what is happening around the fringes. The Japanese spacecraft data has the best resolution but is too expensive to buy in bulk for any but billionaires, even ten square km of data costs hundreds of thousands of dollars to purchase.

To cut a long story short, wait until IceSat 2. We’ll have extremely reliable values then.

It seems incredible that the means to get reliable information on this have not been in place years before now.

Politics perhaps as then i’st harder to deny its happening and we need to get serious

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Date: 15/06/2018 16:07:33
From: PermeateFree
ID: 1240108
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

mollwollfumble said:


Not stooges. The results are probably correct. It’s just that there’s a big uncertainty. For instance the abstract of the paper that is being referred to:
https://www.nature.com/articles/s41586-018-0179-y.epdf
says that for East Antarctica the average rate of ice mass gain is 5 +- 46 billion tonnes per year.

From the original article:

>>West Antarctica has been the hardest hit, losing 175.3 billion tons of ice per year since 2012 – up from 58.4 billion tons a year during the 1990s. The Antarctic Peninsula in the north saw an increase of 27.6 billion tons each year since the beginning of the century, including the giant iceberg that broke off from the Larsen C ice shelf last year.

Interestingly, the East Antarctic ice shelf fared better, actually gaining about 5.5 billion tons of ice each year on average. Unfortunately, that’s a drop in the bucket compared to the speed with which the rest of the continent is melting.<<

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Date: 15/06/2018 17:50:30
From: mollwollfumble
ID: 1240146
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

PermeateFree said:


mollwollfumble said:

Not stooges. The results are probably correct. It’s just that there’s a big uncertainty. For instance the abstract of the paper that is being referred to:
https://www.nature.com/articles/s41586-018-0179-y.epdf
says that for East Antarctica the average rate of ice mass gain is 5 +- 46 billion tonnes per year.

From the original article:

>>West Antarctica has been the hardest hit, losing 175.3 billion tons of ice per year since 2012 – up from 58.4 billion tons a year during the 1990s. The Antarctic Peninsula in the north saw an increase of 27.6 billion tons each year since the beginning of the century, including the giant iceberg that broke off from the Larsen C ice shelf last year.

Interestingly, the East Antarctic ice shelf fared better, actually gaining about 5.5 billion tons of ice each year on average. Unfortunately, that’s a drop in the bucket compared to the speed with which the rest of the continent is melting.<<

Here’s Figure 1. The grey bars are the uncertainties.

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Date: 15/06/2018 18:01:33
From: mollwollfumble
ID: 1240148
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

This bit from the original technical article is amusing.

“Since 1989, there have been more than 150 assessments of ice loss from Antarctica”

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Date: 15/06/2018 18:31:37
From: PermeateFree
ID: 1240159
Subject: re: Antarctic ice loss and sea level rise rates have tripled since 2012

mollwollfumble said:


This bit from the original technical article is amusing.

“Since 1989, there have been more than 150 assessments of ice loss from Antarctica”

Might just illustrate the difficulties involved. However the article in the original post would then be the 131st and considering the number of eminent scientists and organisations involved should be the latest assessment and therefore would take into account previous studies.

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