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Member Run Boards >> Environment >> The Antarctic Ice Shelf
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Message started by lee on Jun 3rd, 2023 at 1:49pm

Title: The Antarctic Ice Shelf
Post by lee on Jun 3rd, 2023 at 1:49pm

Quote:
Antarctic ice shelves provide buttressing support to the ice sheet, stabilising the flow of grounded ice and its contribution to global sea levels. Over the past 50 years, satellite observations have shown ice shelves collapse, thin, and retreat; however, there are few measurements of the Antarctic-wide change in ice shelf area. Here, we use MODIS (Moderate Resolution Imaging Spectroradiometer) satellite data to measure the change in ice shelf calving front position and area on 34 ice shelves in Antarctica from 2009 to 2019. Over the last decade, a reduction in the area on the Antarctic Peninsula (6693 km2) and West Antarctica (5563 km2) has been outweighed by area growth in East Antarctica (3532 km2) and the large Ross and Ronne–Filchner ice shelves (14 028 km2). The largest retreat was observed on the Larsen C Ice Shelf, where 5917 km2 of ice was lost during an individual calving event in 2017, and the largest area increase was observed on Ronne Ice Shelf in East Antarctica, where a gradual advance over the past decade (535 km2 yr−1) led to a 5889 km2 area gain from 2009 to 2019. Overall, the Antarctic ice shelf area has grown by 5305 km2 since 2009, with 18 ice shelves retreating and 16 larger shelves growing in area. Our observations show that Antarctic ice shelves gained 661 Gt of ice mass over the past decade, whereas the steady-state approach would estimate substantial ice loss over the same period, demonstrating the importance of using time-variable calving flux observations to measure change.


https://doi.org/10.5194/tc-17-2059-2023

Authors:   Andreasen, J. R., Hogg, A. E., and Selley, H. L.

Note: NO Jay Zwally. For those who like to nit pick. ::)

Title: Re: The Antarctic Ice Shelf
Post by AusGeoff on Jun 4th, 2023 at 3:22am


Thanks for the link.       I must admit a lot of the report
was way over my pay grade, LOL, but my simple takeaway
was an overall loss of 12,256km2 and a gain of 17,560km2
of Antarctic ice—a "modest" increase of 0.4 % during the
period 2009 to 2019.

Scientific American [July 2027] said Zwally's 2015 study—
though scientifically sound—is an outlier cherry-picked
by conservative news outlets to advance their denialist
positions.  In the summer of 2017 Prison Planet, one of
far-right radio host Alex Jones's Web sites(!), offered it as
evidence that president Donald Trump made the correct
decision for the US leaving the Paris agreement on fighting
climate change.

In 2020, president Biden signed the instrument to bring the
US back into the Paris Agreement, ameliorating the disgraced
former president's ill-informed decision to leave the accord.


Title: Re: The Antarctic Ice Shelf
Post by Bobby. on Jun 4th, 2023 at 7:16am

Quote:
Overall, the Antarctic ice shelf area has grown by 5305 km2 since 2009,
with 18 ice shelves retreating and 16 larger shelves growing in area.



So Greta was wrong?



Title: Re: The Antarctic Ice Shelf
Post by Lisa Jones on Jun 4th, 2023 at 7:38am

Bobby. wrote on Jun 4th, 2023 at 7:16am:

Quote:
Overall, the Antarctic ice shelf area has grown by 5305 km2 since 2009,
with 18 ice shelves retreating and 16 larger shelves growing in area.



So Greta was wrong?




My conclusions after reading that article were as follows:

The Sth Pole and surrounding regions like Tasmania and New Zealand are getting colder WHILST the warmer regions ie everywhere else might be slowly getting warmer.

You couldn’t pay me enough to make me think of moving to/living in Tasmania or New Zealand. The cost of heating would be abominable for starters and if Covid19 loves the cold then that’s where you’ll find it.







Title: Re: The Antarctic Ice Shelf
Post by lee on Jun 4th, 2023 at 1:37pm

AusGeoff wrote on Jun 4th, 2023 at 3:22am:
must admit a lot of the report
was way over my pay grade, LOL, but my simple takeaway
was an overall loss of 12,256km2 and a gain of 17,560km2
of Antarctic ice—a "modest" increase of 0.4 % during the
period 2009 to 2019.



Yes modest. As opposed to shrinking.


AusGeoff wrote on Jun 4th, 2023 at 3:22am:
Scientific American [July 2027] said Zwally's 2015 study—
though scientifically sound—is an outlier cherry-picked
by conservative news outlets to advance their denialist
positions.



Say what? But you highlighted the wrong part. I fixed it for you.

BTW - Scientific American is no longer held in high esteem.

Trump pulled out of Paris because there were more onerous provisions applied to USA than elsewhere. Also it was an executive decision, it didn't pass through Congress. Biden going back in is another executive decision, not based on science.

In fact there are many predicting being above 1.5C by 2027. So much for the Paris Agreement.

Title: Re: The Antarctic Ice Shelf
Post by Bobby. on Jun 4th, 2023 at 5:39pm

Lisa Jones wrote on Jun 4th, 2023 at 7:38am:

Bobby. wrote on Jun 4th, 2023 at 7:16am:

Quote:
Overall, the Antarctic ice shelf area has grown by 5305 km2 since 2009,
with 18 ice shelves retreating and 16 larger shelves growing in area.



So Greta was wrong?




My conclusions after reading that article were as follows:

The Sth Pole and surrounding regions like Tasmania and New Zealand are getting colder WHILST the warmer regions ie everywhere else might be slowly getting warmer.

You couldn’t pay me enough to make me think of moving to/living in Tasmania or New Zealand. The cost of heating would be abominable for starters and if Covid19 loves the cold then that’s where you’ll find it.



You could live in Tassie in winter if you had proper clothing
which would include thermal underwear - a full body suit.

Title: Re: The Antarctic Ice Shelf
Post by UnSubRocky on Jun 4th, 2023 at 9:09pm
What do you reckon the cost of running an air conditioner would be? I only use my air conditioner if it gets over 35°C -- and sometimes not even then. And I use a heater if it is 10°C during the winter. The idea is to either get a good ventilation breeze through the house during the summer. Otherwise, insulate the house to keep the warmth inside during the winter.

Title: Re: The Antarctic Ice Shelf
Post by Jovial Monk on Jun 5th, 2023 at 12:05pm
I love my woodfire!

But would much prefer a heat pump.

Title: Re: The Antarctic Ice Shelf
Post by Lisa Jones on Jun 5th, 2023 at 12:10pm

Bobby. wrote on Jun 4th, 2023 at 5:39pm:

Lisa Jones wrote on Jun 4th, 2023 at 7:38am:

Bobby. wrote on Jun 4th, 2023 at 7:16am:

Quote:
Overall, the Antarctic ice shelf area has grown by 5305 km2 since 2009,
with 18 ice shelves retreating and 16 larger shelves growing in area.



So Greta was wrong?




My conclusions after reading that article were as follows:

The Sth Pole and surrounding regions like Tasmania and New Zealand are getting colder WHILST the warmer regions ie everywhere else might be slowly getting warmer.

You couldn’t pay me enough to make me think of moving to/living in Tasmania or New Zealand. The cost of heating would be abominable for starters and if Covid19 loves the cold then that’s where you’ll find it.



You could live in Tassie in winter if you had proper clothing
which would include thermal underwear - a full body suit.


Only an idiot with dementia would decide to live in Tasmania.

I just took a look at the weather there today :
50E11AF9-F58F-4C9B-A51F-6FB2EEBAB8DC.jpeg (93 KB | 11 )

Title: Re: The Antarctic Ice Shelf
Post by Lisa Jones on Jun 5th, 2023 at 12:11pm
Now compare that with Sydney’s weather for today :
CBB3C88F-CA59-4F2A-AA37-7FF030EA0C81.jpeg (78 KB | 10 )

Title: Re: The Antarctic Ice Shelf
Post by Lisa Jones on Jun 5th, 2023 at 12:15pm
50% of Tasmanians live in Hobart.

Look how cold it is there right now :


3D16F366-8E79-4754-82C0-4646A88B0651.jpeg (102 KB | 8 )

Title: Re: The Antarctic Ice Shelf
Post by Laugh till you cry on Jun 5th, 2023 at 1:47pm
NASA reprots Antarctic is losing 149 Gigaton per year since 2002.

https://youtu.be/AmSovbt5Bho

Title: Re: The Antarctic Ice Shelf
Post by Laugh till you cry on Jun 5th, 2023 at 1:56pm
NASA: Greenland ice loss 279 Gigaton per year since 2002.

https://youtu.be/sK4qz-h8o1M

Title: Re: The Antarctic Ice Shelf
Post by lee on Jun 5th, 2023 at 1:57pm

Laugh till you cry wrote on Jun 5th, 2023 at 1:56pm:
NASA: Greenland ice loss 279 Gigaton per year since 2002.



So now Greenland is in the Antarctic. ;D ;D ;D ;D ;D ;D ;D

Title: Re: The Antarctic Ice Shelf
Post by Laugh till you cry on Jun 5th, 2023 at 1:59pm
NASA: Arctic sea ice loss 12.6% per decade "1979 to 2022".

"In the 44-year-satellite record, 16 of the lowest minimums have all occurred in the last 16 years.

The overall, downward trend in the minimum extent from 1979 to 2022 is 12.6 percent per decade relative to the 1981 to 2010 average. The loss of sea ice is about 78,500 square kilometers (30,300 square miles) per year, equivalent to losing the size of the state of South Carolina or the country of Austria."


Title: Re: The Antarctic Ice Shelf
Post by thegreatdivide on Jun 5th, 2023 at 2:49pm

lee wrote on Jun 5th, 2023 at 1:57pm:

Laugh till you cry wrote on Jun 5th, 2023 at 1:56pm:
NASA: Greenland ice loss 279 Gigaton per year since 2002.



So now Greenland is in the Antarctic. ;D ;D ;D ;D ;D ;D ;D


No, but what does ice-loss of 279 Gigaton per year since 2002 tell you?

Title: Re: The Antarctic Ice Shelf
Post by lee on Jun 5th, 2023 at 4:11pm

thegreatdivide wrote on Jun 5th, 2023 at 2:49pm:
No, but what does ice-loss of 279 Gigaton per year since 2002 tell you?



That there is marginal ice loss. You expect no ice loss? You expect the gravitational field to remain static? Dummy. ::)





Total Mass Balance. About even with 1998 And looks to be about even with 2002.

Or perhaps you like this one -



https://electroverse.co/how-the-greenland-ice-sheet-really-fared-this-year/

Title: Re: The Antarctic Ice Shelf
Post by Jovial Monk on Jun 5th, 2023 at 7:39pm

Lisa Jones wrote on Jun 5th, 2023 at 12:11pm:
Now compare that with Sydney’s weather for today :


Got to 19° where I was today on a shopping trip.

Spent a nice hour walking the beach with Socks.

Title: Re: The Antarctic Ice Shelf
Post by UnSubRocky on Jun 10th, 2023 at 11:42am
It was 27°C yesterday at after 2pm, here. I turned the fan on for the first time just to cool down after having washed the car. Was cool last night, but not cool enough to not feel hot under the doona.

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