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International Glaciological Society
United Kingdom
Приєднався 7 лип 2020
🌍 Welcome to the International Glaciological Society (IGS) UA-cam Channel! ❄️
This is your hub for glaciology seminars presented by leading researchers from around the world. Dive into insightful discussions and cutting-edge presentations covering topics like glaciers, ice sheets, polar science, and the role of ice in our changing climate.
What We Offer:
Full-length seminars by top glaciologists
Expert analyses on the latest research and discoveries
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Whether you're a researcher, student, or simply curious about Earth's icy regions, our channel provides a window into the fascinating world of ice and its global importance.
🔔 Subscribe now to stay informed and never miss a seminar!
#Glaciology #Seminars #Science #Glaciers #PolarScience
This is your hub for glaciology seminars presented by leading researchers from around the world. Dive into insightful discussions and cutting-edge presentations covering topics like glaciers, ice sheets, polar science, and the role of ice in our changing climate.
What We Offer:
Full-length seminars by top glaciologists
Expert analyses on the latest research and discoveries
Opportunities to stay informed on the forefront of glaciological science
Whether you're a researcher, student, or simply curious about Earth's icy regions, our channel provides a window into the fascinating world of ice and its global importance.
🔔 Subscribe now to stay informed and never miss a seminar!
#Glaciology #Seminars #Science #Glaciers #PolarScience
6 November 2024 - Sea ice talks by Pat Wongpan and Natalie Robinson at the IGS Global Seminar Series
6 November 2024
Two sea ice talks.
Pat Wongpan from the Australian Antarctic Program Partnership (AAPP) gives a talk on ‘Gross Primary Production of Antarctic Landfast Sea Ice: A Model-Based Estimate’
and
Natalie Robinson from the National Institute of Water and Atmospheric Research or NIWA, New Zealand, presents ‘Live from the field: Biological and physical properties of sub-ice platelet layers with a new quantitative coring method.
Two sea ice talks.
Pat Wongpan from the Australian Antarctic Program Partnership (AAPP) gives a talk on ‘Gross Primary Production of Antarctic Landfast Sea Ice: A Model-Based Estimate’
and
Natalie Robinson from the National Institute of Water and Atmospheric Research or NIWA, New Zealand, presents ‘Live from the field: Biological and physical properties of sub-ice platelet layers with a new quantitative coring method.
Переглядів: 11
Відео
6 November 2024 - Sea ice talks by Pat Wongpan and Natalie Robinson at the IGS Global Seminar Series
Переглядів 8314 днів тому
6 November 2024 Two sea ice talks. Pat Wongpan from the Australian Antarctic Program Partnership (AAPP) gives a talk on ‘Gross Primary Production of Antarctic Landfast Sea Ice: A Model-Based Estimate’ and Natalie Robinson from the National Institute of Water and Atmospheric Research or NIWA, New Zealand, presents ‘Live from the field: Biological and physical properties of sub-ice platelet layer...
23 Oct. 2024 Doug MacAyeal presented 'A controversial edge of Glaciology' @ IGS Global Seminar
Переглядів 9 тис.21 день тому
On 23 October 2024, Douglas R. MacAyeal from the University of Chicago talks about ‘A controversial edge of Glaciology: Should research on engineering interventions into ice-loss-driven sea-level rise be banned? Pros and cons, plus a discussion.’
9 October 2024 - 3 ECS talks - Advik Eswaran, Laura J. Dietrich and Marissa E. Dattler
Переглядів 156Місяць тому
9 October 2024 3 Early Career Scientists talks Advik Eswaran from Princeton University, USA and he talks about ‘Antarctic 20th-Century Sea Level Mitigation Dominated By Uncertainty in 19th-Century East Antarctic Snow Accumulation‘ Laura J. Dietrich from the Universityof Bergen & Bjerknes Center for Climate Research, Norway and she talks about ‘How can ice rocerd the climate?‘ Marissa E. Dattler...
25 September 2024 - Paul Bierman presented the first talk of the 2024-2025 series.
Переглядів 182Місяць тому
25 September 2024 Paul Bierman presented the first talk of the 2024-2025 IGS Global seminar series. He gave a very interesting talk on the ‘New science and old history from beneath Greenland’s ice - the power of sampling the bed of an ice sheet‘
8 May 2024 3 ECS talks - Elizabeth Case, Clara Henry, Stephanie Olinger @ IGS Global Seminar
Переглядів 1092 місяці тому
8 May 2024 Elizabeth Case from IMAU, Utrecht University, Netherlands, talks about ‘Deglaciation in the Tetons from the mid-20th century to present day‘ Clara Henry from MPI for Meteorology & University of Tübingen, Germany, Now at: Stockholm University, Sweden talks about ‘Modelling the three-dimensional, diagnostic anisotropy field of an ice rise’ Stephanie Olinger from Stanford University, US...
15 May 2024 Kay Ohshima at the International Glaciological Society’s Global Seminar 2023/24 Series
Переглядів 703 місяці тому
15 May 2024 - Kay Ohshima from the Institute of Low Temperature Science, Hokkaido University talks about ‘Global transports of heat, salt/freshwater and materials by sea-ice production and melt‘ at the International Glaciological Society’s Global Seminar 2023/24 Series
1 May 2024 - Kavita Mitkari at the Internat'l Glaciological Society’s Global Seminar 2023/24 Series
Переглядів 3806 місяців тому
1 May 2024 - Kavita Mitkari from the University of Wisconsin-Madison, USA, presents her talk ‘Object-Based Image Analysis for Glacier Features Extraction from Digital Remote Sensing Images‘
10 April 2024 - Melinda Webster gave her talk 'Geoengineering to brighten Arctic Sea Ice'
Переглядів 4167 місяців тому
10 April 2024 at the International Glaciological Society's weekly seminar. Melinda Webster from the University of Washington, Seattle, USA, talks about ‘Geoengineering to brighten Arctic Sea Ice’
3 April 2024, Dominik Fahrner & ‘The response of Greenland’s tidewater glacier termini to climate’
Переглядів 4827 місяців тому
3 April 2024 Dominik Fahrer from the Geological Survey of Denmark and Greenland (GEUS) will talk about ‘The response of Greenland’s tidewater glacier termini to climate’ Dominic is a 2022 Graham Cogley Award recipient
28 March 2024 - Chien Hwa & Yefan Wang at the Intl. Glaciol. Society’s Global Seminar 2023/24 Series
Переглядів 4077 місяців тому
28 March 2024 Chien Hwa from the National Central University in Taiwan gives an ‘Introduction to ongoing Arctic research in Taiwan and its challenges‘ Yefan Wang - Institute of Low temperature Science, Hokkaido University, will present ‘Supraglacial lake evolution on Tracy and Heilprin Glaciers in northwestern Greenland‘
20 March 2024 - Vishnu Nandan and Petra Heil at the IGS’s Global Seminar 2023/24 Series
Переглядів 5068 місяців тому
20 March 2024 IGS Global Seminar Series - two talks on Antarctic sea ice Vishnu Nandan talks about ‘ Overwintering in Antarctica to observe the sea ice‘ Petra Heil presents an Antarctic sea ice update for 2024
13 March 2024 - 3 ECS talks - Elliot Jager, Kaian Shahateet, Ben Wallis @ IGS Global Seminar
Переглядів 4628 місяців тому
13 March 2024 - Three Early Career Scientists talks Eliot Jager from IGE, Univ. Grenoble Alpes, France; INAR, University of Helsinki, Finland presented 'Validating ensemble historical simulations of Upernavik Isstrøm (1985-2019) using observations of surface velocity and elevation' Ben Wallis from ICAS, University of Leeds, UK, talked about 'Contemporary Ice Dynamics of the Antarctic Peninsula:...
7 March 2024 - Ralf Greve at the International Glaciological Society Global Seminar Series
Переглядів 3968 місяців тому
7 March 2024 - Ralf Greve from Hokaido University - Institute of Low Temperature Science presenting a talk entitled 'Reduced mass loss from the Greenland ice sheet under stratospheric aerosol injection, and some general considerations about pros and cons of geoengineering techniques'. All of Ralf's slides are available on Zenodo at doi.org/10.5281/zenodo.10791455
14 Feb. 2024 - Adriana Gulisano and Inga Beck at the Int'l.Glaciological Society’s Global Seminar
Переглядів 1379 місяців тому
Adriana Gulisano from the Universidad de Buenos Aires and Inga Beck from SCAR / SCAR CBET, Germany, both are SCAR EDI-AG coordinators, with their talk ‘The challenges of addressing EDI issues within an Antarctic context‘ The talk was presented by Adriana Gulisano
21 February 2024 - Tyler Meng at the Int'l. Glaciological Society’s Global Seminar 2023/24 Series
Переглядів 4219 місяців тому
21 February 2024 - Tyler Meng at the Int'l. Glaciological Society’s Global Seminar 2023/24 Series
7 Feb 2024 Guillaume Jouve at the Int'l. Glaciological Society’s Global Seminar 2023/24 Series
Переглядів 6319 місяців тому
7 Feb 2024 Guillaume Jouve at the Int'l. Glaciological Society’s Global Seminar 2023/24 Series
31 January 2024 - Emma ‘Mickey’ MacKie & Vigan Mensah @ the IGS’s Global Seminar
Переглядів 5829 місяців тому
31 January 2024 - Emma ‘Mickey’ MacKie & Vigan Mensah @ the IGS’s Global Seminar
January 17 2024 - a Sea Ice talk by Damien_Ringeisen at the IGS’s Global Seminar 2023/24 Series
Переглядів 14710 місяців тому
January 17 2024 - a Sea Ice talk by Damien_Ringeisen at the IGS’s Global Seminar 2023/24 Series
10 January 2024 - Frances Butcher at the IGS’s Global Seminar 2023/24 Series
Переглядів 71410 місяців тому
10 January 2024 - Frances Butcher at the IGS’s Global Seminar 2023/24 Series
8 Nov 2023 - Laura Herraiz Borreguero talkes about 'Rediscovering the East Antarctic Marginal Seas'
Переглядів 20211 місяців тому
8 Nov 2023 - Laura Herraiz Borreguero talkes about 'Rediscovering the East Antarctic Marginal Seas'
6 Dec 2023 Lynn Kaluzienski @ International Glaciological Society’s Global Seminar 2023/24 Series
Переглядів 17111 місяців тому
6 Dec 2023 Lynn Kaluzienski @ International Glaciological Society’s Global Seminar 2023/24 Series
20231129 IGS Global 3 Early Career Researchers - Ochwat, Arthur and Devaux- Chupin
Переглядів 37211 місяців тому
20231129 IGS Global 3 Early Career Researchers - Ochwat, Arthur and Devaux- Chupin
On 1 November 2023 IACS President Liss M. Andreassen gave us some highligts of the IACS operations
Переглядів 15211 місяців тому
On 1 November 2023 IACS President Liss M. Andreassen gave us some highligts of the IACS operations
25 Oct 2023 - 3 ECR Faber, Shin and Gastelu and their advisor Pain on the SILA project
Переглядів 171Рік тому
25 Oct 2023 - 3 ECR Faber, Shin and Gastelu and their advisor Pain on the SILA project
2023-10-11 - Ching Yao Lai @ the International Glaciological Society’s Global Seminar 2023/24 Series
Переглядів 549Рік тому
2023-10-11 - Ching Yao Lai @ the International Glaciological Society’s Global Seminar 2023/24 Series
2023-10-4 Siobhan Killingbeck at the Internatl Glaciological Society Global Seminar 2023/2024 Series
Переглядів 501Рік тому
2023-10-4 Siobhan Killingbeck at the Internatl Glaciological Society Global Seminar 2023/2024 Series
3 May 2023, two Sea ice talks by Arttu Jutilla and Mark England
Переглядів 230Рік тому
3 May 2023, two Sea ice talks by Arttu Jutilla and Mark England
5 April 2023 - 2 Sea ice talks, Karley Campbell and Stephanie Lim @ the IGS Globals Seminar.
Переглядів 208Рік тому
5 April 2023 - 2 Sea ice talks, Karley Campbell and Stephanie Lim @ the IGS Globals Seminar.
29/03/2023 Zemp et.al. 'GlaMBIE: an Intercomparison Exercise of Regional and Global Mass Changes'
Переглядів 477Рік тому
29/03/2023 Zemp et.al. 'GlaMBIE: an Intercomparison Exercise of Regional and Global Mass Changes'
Man, those coral reefs are in rough shape huh? Polar bears too!
I'm just average Joe who got mad about carbon/green craziness so I did my own investigation. Well you already have the answer to climate change by ice core changes .Bingo our sun is controlling our planet. Like it or not it's the cycle of life, and happens every 6000y and nothing humans can do change this cycle.Why this is taboo to tell the truth is wrong. 😎👍
You people really are nuts. We already know from the ice cores that global warming is BS. As for your gender ideas, I really question your fitness to be academics.
Through the great gift to humanity, glaciology, we now have a YEAR BY YEAR knowledge of the planets atmospheric Carbon content (and much more) for a period more than 10 times longer since Homo Sapiens left the African continent the first time. For over 1.1 million years our atmospheric Carbon content have been relative stable at 220 PPM. 3 times in the 1.1 million+ years gigantic widespread global volcanic eruptions have raised the Carbon content with 30 PPM and EACH time it have triggered longterm climate changes for thousands of years before the planets regulating systems slowly have been able to bring it down to 220 PPM again. It are true to state that a atmospheric Carbon content of 220 PPM created us and nearly all living species present on the globe with very few exceptions. Besides the Asteroid that hit Yucatan 66 million years ago, the largest species extinctions we have been able to document have happened during the 3 times the atmospheric content rose with 30 PPM. Since the Industrial revolution, just a few hundred years ago, we have raised the atmospheric Carbon content from 220 PPM to now (2022 number) 417 PPM! So humans NOW have caused not a 30 PPM rise but unprecedented 197 PPM! We are right now in the largest species extinction period since the Asteroid hit Yucatan 66 million years ago! The worlds oceans are right now heating with the same energy added equalling 5 Hiroshima bombs PER SECOND! That are the sickening facts! " This reality means we right now are out of time. ONLY urgent transitioning can save humanity. The planets regulating systems do not care what anyone decides in international conferences or what these useless people signs on a piece of paper. The atmosphere and our oceans simply respond to the massive amounts of CO2 and methane we currently let out in unprecedented amounts! Please fact check the provided information. You are in front of a device with internet access.
❤ lov education
Great ❤ presentation, ty & no. It should not be banned, but beware of hazzards ❤
12:06 How did this subject become gender-related?
This is where all our tax money is being wasted. More and more useless researchers Our climate is getting better, not worse. a. Number of tropical storms has been decreasing for 120 years. b. Number of US landfall hurricanes has been steady for 120 years. c. Number of strong US tornadoes has been reducing for 70 years. d. Northern Hem winter snowfall has been steady for 60 years. e. Antarctic sea ice had been increasing for 35 years, since 1980. f. Numbers of polar bears has been increasing for 60 years. g. Global drought index has been reducing for 40 years. h. Precipitation is cyclical, in line with the AMO oceanic cycle i. Forest fires have greatly reduced j. Antarctic temperatures have not changed in 40 years k. The heatwave index has reduced since the warm 1930 l. David Attenborough was lying when he said climate was forcing walruses to jump off cliffs So what is the problem with a smidgen of warming? Warm is good, cold is bad.. And CO2 is plant food, that is greening the planet. Ralph
The white paper being discussed: climateengineering.uchicago.edu/wp-content/uploads/2024/05/Glacial-Climate-Intervention_A-Research-Vision.pdf
The last part of the third talk is missing.
❤
Super interesting
Super fascinating
Thank you for sharing
super interesting
Geo engineering in the artic, what could go wrong
Super fascinating
Based on the fracture of the Larsen C ice shelf first being noticed in November 2010, its extent and width at that time and its rate of growth the few years following, I suggest the possibility that the fracture of the Larsen C ice shelf might well have been caused by the Indian Ocean tsunami 26 December 2004 following sea bed earthquake. "The tsunami also reached Antarctica, where tidal gauges at Japan's Showa Base recorded oscillations of up to a metre with disturbances lasting a couple of days". ------------------------------ I see "the sea floor is estimated to have risen by several metres, displacing an estimated 30 <km**3> of water". If I take the tsunami as radiating in a circle then the radius is 13,000 km at Larsen C ice shelf distance so the quantity of tsunami water per metre of impacted face is 30,000,000,000 / (26,000,000 * pi) = 367 m**3 (this assumes negligible settling of the water during travel). For 1 metre of SLR extending to 367m from the ice shelf face I compute 367 * 42,000 * 10,000 = 154,000,000,000 newton-metres of torque per metre of fracture run at the fracture point using a 42km width. If I assume 350m thick then the tensile pull at the bottom of the fracture from 1m SLR lifting at 42 km from the pivot point = 440,000,000 newtons per metre of fracture run. The tensile pull over 350m thick from 1m SLR lifting over 42 km = 1,260,000 newtons per metre of ice depth per metre of fracture run (i.e. per square metre) average throughout ice depth. However, (595-435)/595=27% so the lowest 50m of the ice shelf face is subjected to 27% of the torque force, so tensile pull over the lowest 50m of the ice shelf face = 2,380,000 newtons per metre of ice depth per metre of fracture run (i.e. per square metre). The tensile strength of ice varies from 0.7-3.1 MPa so the fracturing force exerted on the ice shelf at the fracture location from 1 metre of SLR would be anywhere between 0.8x and 3.4x that required to fracture it (if ice were infinitely brittle) so it is definitely of the order of magnitude to be very possible based on the 367 m**3 simultaneously per metre of impacted face. ------------------------------ Of course, ice has some ductility & malleability (not perfectly brittle) and tides there are of order 1m to 1.7m, same as that tsunami or somewhat higher, so the ice shelf could not survive tides if it was perfectly brittle. Davis tide table indicates typically 14 hours for the tide to rise 1m to 1.7m but likely the far more rapid impact force of a tsunami SLR (over a few minutes I assume) would not give the ice shelf sufficient time to respond elastically throughout its length and it fractured along its weakest line on the lower face due to the torque exerted. This would open a fracture 7 mm wide at 42 km back from the face if the ice did not yield anywhere except at the fracture so, for example, if the ice bent 90% of the required amount to relieve stress throughout its length then it would open a fracture 0.7 mm wide. This would need structural analysis to figure it out properly. ------------------------------ The line from the centre of the tsunami origin to the centre of the Larsen C ice shelf is at an angle close to perpendicular at Larsen C so SLR would have been applied across a large width of the face simultaneously. The only significant contraindication is that it appears that a straight line across the ocean from the centre of the tsunami origin to the centre of the Larsen C ice shelf might be interrupted by the western edge of Queen Maude Land, in which case there would be no direct wave front across all of the centre of the Larsen C ice shelf but only the portion of the original wave that spreads southwards. ------------------------------ Extrapolating back in time from the fracture distance increase between 2010-11 and 2015-10 indicates a fracture date of 2002-05 which is 2.5 years before the tsunami so it doesn't support the December 2004 date strongly but given the uncertainty in that method it doesn't rule it out (perhaps there was some initial length of fracture before it started increasing). Analysis by Paolo et al 2015 indicates that Larsen C ice shelf lost 5% of its thickness 1994-2012 which means that the torque required to fracture it has been reduced by ~ <I didn't finish in August 2017>
Persistent westerly winds have also dragged the current in one direction for over 20 years, increasing the speed and size of the clockwise current and preventing the fresh water from leaving the Arctic Ocean. This decades-long western wind is unusual for the region, where previously, the winds changed direction every five to seven year. Scientists have been keeping an eye on the Beaufort Gyre in case the wind changes direction again. If the direction were to change, the wind would reverse the current, pulling it counterclockwise and releasing the water it has accumulated all at once. "If the Beaufort Gyre were to release the excess fresh water into the Atlantic Ocean, it could potentially slow down its circulation. And that would have hemisphere-wide implications for the climate, especially in Western Europe," said Tom Armitage, lead author of the study and polar scientist at NASA's Jet Propulsion Laboratory in Pasadena, California. Fresh water released from the Arctic Ocean to the North Atlantic can change the density of surface waters. Normally, water from the Arctic loses heat and moisture to the atmosphere and sinks to the bottom of the ocean, where it drives water from the north Atlantic Ocean down to the tropics like a conveyor belt. This important current is called the Atlantic Meridional Overturning Circulation and helps regulate the planet's climate by carrying heat from the tropically-warmed water to northern latitudes like Europe and North America. If slowed enough, it could negatively impact marine life and the communities that depend on it. "We don't expect a shutting down of the Gulf Stream, but we do expect impacts. That's why we're monitoring the Beaufort Gyre so closely," said Alek Petty, a co-author on the paper and polar scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland. The study also found that, although the Beaufort Gyre is out of balance because of the added energy from the wind, the current expels that excess energy by forming small, circular eddies of water. While the increased turbulence has helped keep the system balanced, it has the potential to lead to further ice melt because it mixes layers of cold, fresh water with relatively warm, salt water below. The melting ice could, in turn, lead to changes in how nutrients and organic material in the ocean are mixed, significantly affecting the food chain and wildlife in the Arctic. The results reveal a delicate balance between wind and ocean as the sea ice pack recedes under climate change. "What this study is showing is that the loss of sea ice has really important impacts on our climate system that we're only just discovering," said Petty. News Media Contacts Rexana Vizza / Matthew Segal Jet Propulsion Laboratory Pasadena Calif 818-393-1931 / 818-354-8307
As always, I greatly appreciate IGS making these webinars available online. Good job with the consistency, folks.
Is this the same Jason Briner from Kirkland WA? Finn Hill.
If I heard correctly, he said that sea level rise could occur in a relatively short amount of time ... by which he means a century or so? Will society mostly think this is too far in the distant future to concern the present generation? What are the costs involved? Do we do this instead of solving/reducing global poverty? It's going to be a hard sell.
So what you’re saying is that melt layers with reduced permeability to diffusion inhibit the passage of present day atmospheric gases to the firm/ice core interface. Implications are right that present day gases are not being recorded in the top of the ice layer where gases are eventually locked in?
Very interesting lecture 🤓 I spent the last 11 years looking into and writing about global warming. Despite being catastrophic, sea level rise is the least of my global concerns. I'm a lot more worried abot the impacts on the food chain/biosphere, like the decline in photosynthesis, be it terrestrial forest or phytoplankton. Phytoplankton (microscopic plants) is the absolute basis of the marine food web and is also affected by ocean acidification. Phytoplankton produces 50% to 70% of the oxygen used by Life on this planet.
wow, ...going going,...gone? Who ever predicted that?
Ever heard of #MISI and #MICI. Those aren't Disney characters, MISI : Marine Ice Shelf Instability MICI Marine Ice Cliff Instability.I recommend you try to learn about those. Interesting Physics. ☮ It is somewhat what he's talking about, which is why I put the # in there,
@@a.randomjack6661 Sorry friend, ..Sarcasm is my forte,... We Are So F57ked is my byline i am indeed aware of the devastating loss's we have already incurred. Climate Change is real and i appreciate your vigor in defending any potential denial of it.
Great to see that the needs of the global IGS community is taken into account better by shifting some time slots around!
93,4% of the warming goes into the ocean. The troposphere holds only 2,3% of the warning.
By millennium the oceans are culling the planet but on the last decades we killed the oceans with plastic and various pollution big troubles are rapidly and abrupt coming on the next few years
Thank YOU for the efforts made to share this Knowledge
Sorry I missed this talk. You have done AWESOME. The detail and technical sense is on point. For the record: Carter et al.,2007 classified South Pole lake as something other than "Definite lake".
That was a cool talk!
Fascinating.
A typo in the title: 2003→2023😆
👏👏
Good
thank you for presenting these lectures publicly for immediate dispersal throught our public social media networks
fascinating stuff, ...Keep going !
fascinating
😒 𝓅𝓇o𝓂o𝓈𝓂
Pretty cool
thanks for sharing... What great information... Much love and respect for all that the research team has done... Question... How much does mount Erebus play in this process?.. Peace, love and cheer!.. 🙏❤🌅🌈
Since the icecliff failure is clearly visible on S1 SAR over 100 kilometres inland behind Thwaites and Pine Island now, right back to the flanks of Mt Takahe and other recently active volcanos, are we not well into the fast sea level rise regime now???
Eric's "becomes completely afloat" at 7:13 is incorrect according to the cartoon shown because the pressure at the sea bed exerted by ice above is greater than the hydrostatic pressure at that depth. Ocean water would likely intrude through fissures but no floating of the ice.
Based on the fracture of the Larsen C ice shelf first being noticed in November 2010, its extent and width at that time and its rate of growth the few years following, I suggest the possibility that the fracture of the Larsen C ice shelf might well have been caused by the Indian Ocean tsunami 26 December 2004 following sea bed earthquake. "The tsunami also reached Antarctica, where tidal gauges at Japan's Showa Base recorded oscillations of up to a metre with disturbances lasting a couple of days". ------------------------------ I see "the sea floor is estimated to have risen by several metres, displacing an estimated 30 <km**3> of water". If I take the tsunami as radiating in a circle then the radius is 13,000 km at Larsen C ice shelf distance so the quantity of tsunami water per metre of impacted face is 30,000,000,000 / (26,000,000 * pi) = 367 m**3 (this assumes negligible settling of the water during travel). For 1 metre of SLR extending to 367m from the ice shelf face I compute 367 * 42,000 * 10,000 = 154,000,000,000 newton-metres of torque per metre of fracture run at the fracture point using a 42km width. If I assume 350m thick then the tensile pull at the bottom of the fracture from 1m SLR lifting at 42 km from the pivot point = 440,000,000 newtons per metre of fracture run. The tensile pull over 350m thick from 1m SLR lifting over 42 km = 1,260,000 newtons per metre of ice depth per metre of fracture run (i.e. per square metre) average throughout ice depth. However, (595-435)/595=27% so the lowest 50m of the ice shelf face is subjected to 27% of the torque force, so tensile pull over the lowest 50m of the ice shelf face = 2,380,000 newtons per metre of ice depth per metre of fracture run (i.e. per square metre). The tensile strength of ice varies from 0.7-3.1 MPa so the fracturing force exerted on the ice shelf at the fracture location from 1 metre of SLR would be anywhere between 0.8x and 3.4x that required to fracture it (if ice were infinitely brittle) so it is definitely of the order of magnitude to be very possible based on the 367 m**3 simultaneously per metre of impacted face. ------------------------------ Of course, ice has some ductility & malleability (not perfectly brittle) and tides there are of order 1m to 1.7m, same as that tsunami or somewhat higher, so the ice shelf could not survive tides if it was perfectly brittle. Davis tide table indicates typically 14 hours for the tide to rise 1m to 1.7m but likely the far more rapid impact force of a tsunami SLR (over a few minutes I assume) would not give the ice shelf sufficient time to respond elastically throughout its length and it fractured along its weakest line on the lower face due to the torque exerted. This would open a fracture 7 mm wide at 42 km back from the face if the ice did not yield anywhere except at the fracture so, for example, if the ice bent 90% of the required amount to relieve stress throughout its length then it would open a fracture 0.7 mm wide. This would need structural analysis to figure it out properly. ------------------------------ The line from the centre of the tsunami origin to the centre of the Larsen C ice shelf is at an angle close to perpendicular at Larsen C so SLR would have been applied across a large width of the face simultaneously. The only significant contraindication is that it appears that a straight line across the ocean from the centre of the tsunami origin to the centre of the Larsen C ice shelf might be interrupted by the western edge of Queen Maude Land, in which case there would be no direct wave front across all of the centre of the Larsen C ice shelf but only the portion of the original wave that spreads southwards. Update: Looks like a southern diversion of only 20 degrees of arc from Queen Maude Land coast, so not much, and that diversion looks to make the arriving ripple even more perpendicular at Larsen C. ------------------------------ Extrapolating back in time from the fracture distance increase between 2010-11 and 2015-10 indicates a fracture date of 2002-05 which is 2.5 years before the tsunami so it doesn't support the December 2004 date strongly but given the uncertainty in that method it doesn't rule it out (perhaps there was some initial length of fracture before it started increasing).
Are subglacial environments of valley glaciers in Himalayan region more complex?
Star Wars is all about a commercial empire ruining a galaxy and some random resistant fighting back. I wonder where they got that silly idea.
Thanks for sharing
Frederik t. Thwaites never ever set foot in Antarctica nor did research there in person. Glaicier naming honor was paid for by corrupt Wisconsin governor at the time. Google for truth
great talk and summary on glaciers status and potential new glacier law in Chile!
Maybe solar weather picking back up will help things 🤞
Mis-speak at 8:36 "2,000 gigatonnes" S.B. "2,000 gigaNewtons (0.2 gigatonnes-force).
What the heck at 43:27 because Eric Rignot puts on shades, grabs a guitar and sings "Rocking at the grounding line" about some very-naughty mermaids in his talk. Is there some underlying theme with this bunch ?