Arctic Sea Ice : Forum

Cryosphere => Glaciers => Topic started by: Sigmetnow on July 27, 2013, 05:02:59 PM

Title: Alaska Glaciers
Post by: Sigmetnow on July 27, 2013, 05:02:59 PM
Mendenhall Glacier near Juneau, Alaska, has started to periodically flood the Mendenhall River on which the city sits.

Quote
As water builds up in the basin and seeks an outlet, it can actually lift portions of the glacier ever so slightly, and in that lift, the water finds a release. Under the vast pressure of the ice bearing down upon it, the water explodes out into the depths of Mendenhall Lake and from there into the river.

Glaciologists even have a name for the process, which is happening in many places all over the world as climates change: jokulhlaup, an Icelandic word usually translated as “glacier leap.”

http://www.nytimes.com/2013/07/23/us/alaska-looks-for-answers-in-glaciers-summer-flood-surges.html?_r=1& (http://www.nytimes.com/2013/07/23/us/alaska-looks-for-answers-in-glaciers-summer-flood-surges.html?_r=1&)
Title: Re: Alaska Glaciers
Post by: Sigmetnow on August 17, 2013, 04:05:49 PM
OK, not exactly a glacier.  But a “frozen debris lobe” threatens the Dalton Highway to Prudhoe Bay, and even the trans-Alaskan pipeline itself, above the Arctic Circle.  And it’s moving faster lately -- about an inch a day.

http://www.alaskadispatch.com/article/20130813/only-alaska-creeping-frozen-landslide-threatens-critical-highway-and-pipeline (http://www.alaskadispatch.com/article/20130813/only-alaska-creeping-frozen-landslide-threatens-critical-highway-and-pipeline)
Title: Re: Alaska Glaciers
Post by: Sigmetnow on June 27, 2015, 07:44:44 PM
Alaska’s Glaciers Seen as Major Source of Sea Level Rise
Quote
The ice that tumbles into the ocean along Alaska’s coastline often makes for dramatic images that show one of the ravages of climate change – melting tidewater glaciers that contribute to sea level rise. But a new study finds that far more meltwater is flowing into the sea from a similar, if less frequently photographed source – inland glaciers.

Compared to their coastal counterparts, inland glaciers account for 95 percent of glacial mass loss due to climate-driven melting, a study published this month in Geophysical Research Letters shows. In fact, researchers found that Alaska’s glaciers are melting so fast that they would cover the state with a 1-foot thick layer of water every seven years.
http://www.climatecentral.org/news/alaska-glaciers-sea-level-rise-19159 (http://www.climatecentral.org/news/alaska-glaciers-sea-level-rise-19159)
Title: Re: Alaska Glaciers
Post by: Paddy on July 16, 2015, 11:28:40 PM
Out of curiosity, how many gigatons of ice do Alaska's glaciers contain?
Title: Re: Alaska Glaciers
Post by: Tor Bejnar on July 17, 2015, 12:56:27 AM
Glaciers cover about 75,000 km2 of Alaska. (http://pubs.usgs.gov/pp/p1386k/pdf/02_1386K_part1.pdf)
If all of Alaska's glaciers melted, sea level would rise ~ 0.05 meters (about 0.16 feet). (http://www.usgs.gov/climate_landuse/glaciers/glaciers_sea_level.asp)
Ocean area=165,250,000 sq km (http://www.enchantedlearning.com/subjects/ocean/)
165,250,000 x 0.05 x 10-3 = 8,260 km-3

Results (http://www.calculator.net/mass-calculator.html?cdensity=1&cdensityunit=1000&cvolume=8260&cvolumeunit=1e-9&x=50&y=13)            Unit
8260000000    kilogram
8260000000000    gram
8.26E+15    milligram
8,260,000    ton
18210197710.718    pound (lb)
41300000000000    carrat
1.2747127999495E+14    grain
4.974284874552E+36    atomic mass unit

] = 0.00826 gigatonnes (http://www.convertunits.com/from/gigatonne/to/ton+[metric)

if my choice of website data, internet calculators and arithmetic skills work right (without checking my work)
Title: Re: Alaska Glaciers
Post by: Paddy on July 18, 2015, 02:59:34 PM
Thank you for that analysis!

I suppose the take home message is that Alaska is still a pretty small chunk of the total likely contribution compared to the big boys of Greenland and Antarctica...
Title: Re: Alaska Glaciers
Post by: abbottisgone on April 26, 2016, 09:50:50 AM
Thank you for that analysis!

I suppose the take home message is that Alaska is still a pretty small chunk of the total likely contribution compared to the big boys of Greenland and Antarctica...
The take home message is Glaciers are the worlds thermometers!

Complex systems are measured by indicators..
Title: Re: Alaska Glaciers
Post by: baileyrorys on May 07, 2016, 12:47:16 AM
Here's a photo of the Lamplugh Glacier at Johns Hopkins Inlet on July 22nd, 2014.

https://picasaweb.google.com/lh/photo/FIZ09Zd_a7zW5LSvuvz-a9MTjNZETYmyPJy0liipFm0?feat=directlink
Title: Re: Alaska Glaciers
Post by: solartim27 on July 08, 2016, 09:53:20 PM
Lamplugh is in the news again today with a giant landslide
http://www.nytimes.com/2016/07/06/science/alaska-landslides-glaciers-melt.html?_r=2 (http://www.nytimes.com/2016/07/06/science/alaska-landslides-glaciers-melt.html?_r=2)
Here is an Aqua Gif from 6/23 to 7/4

Quote
"An enormous landslide that spread rocky debris more than six miles across a glacier in southeastern Alaska last week was not the first to occur in the area, and certainly will not be the last.

The slide, first noticed by Paul Swanstrom, a sightseeing pilot, on June 28, occurred when part of a mountain gave way near Lamplugh Glacier, in Glacier Bay National Park, about 100 miles northwest of Juneau.

The slide caused seismic tremors that first registered at magnitude 2.9, , according to data from the Alaska Earthquake Center. But that magnitude was computed as if the tremors were from an earthquake. Scientists at the center later recalculated the magnitude and came up with a higher figure, 5.5."
Title: Re: Alaska Glaciers
Post by: Tor Bejnar on July 09, 2016, 05:10:48 AM
More on this landslide from Dr. Dave Petley's July 3 Landslide Blog (http://blogs.agu.org/landslideblog/2016/07/03/lamplugh-glacier-rock-avalanche-1/).

(https://forum.arctic-sea-ice.net/proxy.php?request=http%3A%2F%2Fblogs.agu.org%2Flandslideblog%2Ffiles%2F2016%2F07%2F16_07-Alaska-1a-e1467532157303.jpg&hash=001b0dab3302e219efa5df91cd120521)
Title: Re: Alaska Glaciers
Post by: JimD on July 10, 2016, 12:48:52 AM
Wow.  To have seen that live.
Title: Re: Alaska Glaciers
Post by: skanky on November 10, 2016, 12:50:17 PM
More on the above, again, from the same website: http://blogs.agu.org/landslideblog/2016/11/10/planet-labs-lamplugh/ (http://blogs.agu.org/landslideblog/2016/11/10/planet-labs-lamplugh/)
Title: Re: Alaska Glaciers
Post by: johnm33 on November 11, 2016, 10:54:22 AM
I'm beginning to wonder how many of these northern mountains are rubble held together by ice.
Title: Re: Alaska Glaciers
Post by: skanky on December 14, 2016, 10:43:45 AM
Alaskan landslides and glacial melting: http://blogs.agu.org/landslideblog/2016/12/07/icy-bay-landslide/ (http://blogs.agu.org/landslideblog/2016/12/07/icy-bay-landslide/)
Title: Re: Alaska Glaciers
Post by: Aporia_filia on February 09, 2017, 12:00:40 PM
I was very surprised when a knowledgable person told me about a >500 meters wave recorded in the 50s. I could not completely believe it till I read this (some in the wiki as well);

http://geology.com/records/biggest-tsunami.shtml (http://geology.com/records/biggest-tsunami.shtml)
Title: Re: Alaska Glaciers
Post by: Bruce Steele on April 17, 2017, 08:22:27 PM
https://youtu.be/jwSjKjwkAOY

Thirty two years ago I traveled to Prince William sound to participate in a dive fishery for a herring roe
on kelp fishery about this time of year.  A bush pilot who my wife and I hired took us on a joyride after my wife had gotten the pictures she needed for a magazine article she was writing . He took us to the base of Columbia Glacier and throttled up as he put the small plane just above the water / floating ice field.  He headed straight into a fissure and we were flying inside the Columbia glacier with ice walls a on either side of the wings. He pulled back on the stick and we exited vertically out of the glacier , did a hammerhead and shot straight back into another fissure.  We then exited the glacier back at deck level over the water/ floating ice field.
 It wasn't the craziest thing I did during that fishing season but 14 hour dives in 36 degree water are fishing stories. Maybe this all sounds like a fish story . Anyway the Columbia doesn't calf into the sound like it did back in 1984.  The Prince William Sound herring fishery has only been a small artisanal effort in the decades after the Valdez hit Bligh Rock in 1986.  I read recently a course change to avoid a iceberg field, with origins from Columbia Glacier, was causative in the tankers grounding. The collapse of the herring fishery, the collapse / retreat of the Columbia Glacier, the oil spill and the oil from the North Slope all play interactive parts in this story.
Title: Re: Alaska Glaciers
Post by: solartim27 on May 22, 2017, 08:37:41 AM
Mendenhall Glacier near Juneau, Alaska, has started to periodically flood the Mendenhall River on which the city sits

Nice drone footage from the area
https://youtu.be/-4-RQLHr5wU
Title: Re: Alaska Glaciers
Post by: solartim27 on August 12, 2017, 08:54:09 AM
Insane footage from Ruth Glacier
https://www.instagram.com/p/BXgNgIFjIr1/ (https://www.instagram.com/p/BXgNgIFjIr1/)
Quote
natgeoVideo by @renan_ozturk @sanctityofspace collection // A phenomenon of the Ruth Glacier Alaska. While filming on the glacier @freddiewilkinson noticed a couple hundred ft wide bubbling pool about a mile away from the terminus of the main glacier. The Ruth Glacier is among the thickest glaciers on earth at around 4000ft but is melting fast with the effects of climate change. We have asked a few friends but are still unsure if this is natural or abnormal. The forces seem accelerated these days as water is drawn down 'moulins' or shafts in the glacier only to emerge in such a startling high volume pool so far down valley. The inner workings are a bit of a mystery and scientific study waiting to happen but I can't help but think of it as one of my favorite places bleeding out under a warming planet. For more images of the Alaska range see @renan_ozturk @sanctityofspace. ~ Aerial DP's @camp4collective @ansonfogel @zatzworks
Title: Re: Alaska Glaciers
Post by: Sigmetnow on April 15, 2018, 04:27:13 PM
Global warming is causing an Alaskan glacier to melt at the fastest pace in 400 years
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One of the USA's tallest glaciers is melting at the fastest pace in 400 years, a new study reports.

The study said melting on Mount Hunter in Alaska’s Denali National Park can be linked mainly to rising summer temperatures in the region.

"We have not seen snow melt like this in at least four centuries,” said study lead author Dominic Winski, a glaciologist at Dartmouth College.

New ice cores taken from the top of Mt. Hunter show summers there now are least 2 to 3 degrees Fahrenheit warmer than they were during the 18th, 19th and early 20th centuries. Specifically, the ice core record shows 60 times more snow melt occurs today than did 150 years ago. ...
https://www.usatoday.com/story/news/nation/2018/04/11/global-warming-causing-alaskan-glacier-melt-fastest-pace-400-years/506549002/
Title: Re: Alaska Glaciers
Post by: Sigmetnow on April 15, 2018, 07:00:40 PM
“Melting time lapse of the Mendenhall Glacier near Juneau. Over just 7 years. credit to James Balog @EarthVisionInst ”
https://twitter.com/ClimateHuman/status/985305766109167617

Video at the link.
Title: Re: Alaska Glaciers
Post by: oren on April 15, 2018, 08:52:02 PM
Great video. The rate of change is scary.
Title: Re: Alaska Glaciers
Post by: solartim27 on July 07, 2018, 04:58:10 PM
Another cool video
Quote
Alaska CASC (@Alaska_CASC) Tweeted:
Watch: A dramatic calving event surprised researchers at Suicide Basin, a glacier-dammed lake adjoining Mendenhall Glacier in Juneau, when a section of ice 1/5th of a mile wide separated ice in the basin from the main #glacier

https://t.co/k70hcnCs1E @NWSAPRFC @uafairbanks @USGS https://t.co/kM4BrjZcu8 https://twitter.com/Alaska_CASC/status/1012854506491502593?s=17
Title: Re: Alaska Glaciers
Post by: ReverendMilkbone on July 08, 2018, 07:40:19 PM
Google Earth Engine shows a lot of these glaciers receding;

Mendenhall Glacier in Alaska;

https://earthengine.google.com/timelapse/#v=58.43448,-134.5559,11.03,latLng&t=1.30

Columbia Glacier in Alaska;

https://earthengine.google.com/timelapse/#v=61.14667,-146.91079,8.019,latLng&t=0.61

Barnes Ice Cap (Remnant of last ice age, also Canada but whatever) melting away...;

https://earthengine.google.com/timelapse/#v=70.0137,-74.1739,7.193,latLng&t=0.80
Title: Re: Alaska Glaciers
Post by: kassy on August 16, 2019, 09:28:27 AM
Sawyer Glacier 2012 vs 2019 pictures:
https://uk.news.yahoo.com/shocking-images-show-how-much-alaskan-glacier-has-melted-in-just-five-years-113618212.html
Title: Re: Alaska Glaciers
Post by: SteveMDFP on August 17, 2019, 01:37:26 AM
Sawyer Glacier 2012 vs 2019 pictures:
https://uk.news.yahoo.com/shocking-images-show-how-much-alaskan-glacier-has-melted-in-just-five-years-113618212.html

Very disturbing images.
Even more disturbing is the chorus of denier comments below them.
Title: Re: Alaska Glaciers
Post by: GoodeWeather on August 17, 2019, 03:00:50 AM
Sawyer Glacier 2012 vs 2019 pictures:
https://uk.news.yahoo.com/shocking-images-show-how-much-alaskan-glacier-has-melted-in-just-five-years-113618212.html

It's a horrible comparison and gives deniers more fuel.  You can clearly tell the pictures were taken from a different point of view.  The second picture was clearly taken from further away.  I would also love to know the exact date for each picture, as it appears the second picture was take at a later date in the melting season.
Title: Re: Alaska Glaciers
Post by: Tom_Mazanec on September 09, 2019, 06:23:46 PM
Navigator: Listening to the Glaciers Fall
https://www.citylab.com/newsletter-editions/2019/09/navigator-listening-glaciers-fall/597427/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheAtlanticCities+%28CityLab%29&utm_content=FeedBurner
Quote
“White Thunder” is the name some locals have for it—the sound ice makes as it’s melting, breaking into pieces, and retreating. We squinted and strained, bodies alert, waiting for something to happen.

When it comes to on-the-nose symbols of climate change (and an individual’s complicity in it), this scene is up there. My family and I had traveled to Alaska’s Kenai Fjords National Park for a summer vacation. Together, we had flown, driven, and boated more than 7,000 miles to get to a land that’s often described as “untouched.” And there we were, under the sun of one of Alaska’s hottest summers in recent memory, staring at something that looked so permanent, breathlessly waiting to see it change.
Title: Re: Alaska Glaciers
Post by: vox_mundi on December 14, 2019, 10:42:27 PM
See How an Alaskan Glacier has Shrunk Over Time
https://www.sciencenews.org/article/see-how-alaska-columbia-glacier-has-shrunk-over-time

https://youtu.be/r_flzIOJR8I

Alaska’s Columbia glacier began rapidly retreating around 1980, and its leading edge has moved more than 20 kilometers inland. These images, captured by the joint NASA / U.S. Geological Survey Landsat satellites, were stitched together into a video to show the glacier’s dynamic evolution from 1972 to 2019. Video: Mark Fahnestock / University of Alaska Fairbanks
Title: Re: Alaska Glaciers
Post by: vox_mundi on June 27, 2020, 10:29:22 PM
More Fragments From 1952 Crash In Alaska Found In Glacier
https://phys.org/news/2020-06-fragments-alaska-glacier.html

(https://forum.arctic-sea-ice.net/proxy.php?request=http%3A%2F%2Fglacierhub.org%2Fwp-content%2Fuploads%2F2017%2F05%2Fcolony_glacier.png&hash=3ee5dc243127701719dd40e588144792)
https://glacierhub.org/tag/c-124-globemaster/

A lucky Buddha figurine, a flight suit, several 3-cent stamps, a crumpled 1952 Mass schedule for St. Patrick's Church in Washington, D.C., and 480 bags containing individual human remains.

Those were among the items recovered this month from Alaska's Colony Glacier, where an annual somber search continues for human remains and debris after a military plane crashed 67 years ago, officials said Friday.

The goal is to identify and return remains from everyone onboard the C-124 Globemaster, which smashed into Mount Gannett north of Anchorage on Nov. 22, 1952, killing all 41 passengers and 11 crew members, military officials said Friday at a news conference at Joint Base Elmendorf-Richardson in Anchorage.

The remains of those killed weren’t retrieved at the time, and the plane and all it held slowly fell to the bottom of the mountain, where it eventually became part of Colony Glacier.

... The crash was virtually forgotten until a military training mission spotted a yellow life raft on the glacier. Efforts began in 2012 to scour the glacier to see what else may have churned up, including human remains and other debris.

Now, the race is on to identify as many service members as possible before the glacier dumps the wreckage into Lake George, which will become a final resting place for everything that isn't saved. ... They might have only several more years of searching the glacier before the debris field calves into the lake.

The last area they found remains this year was about 656 feet (200 meters) from the toe of the glacier, where the ice falls into the lake.

Using a back-of-the-envelope calculation, McNabb said the plane traveled 23 kilometers along the flowpath. McNabb calculated that the average surface velocity would have been about 1.5 meters per day.

https://en.m.wikipedia.org/wiki/1952_Mount_Gannett_C-124_crash

https://www.youtube.com/watch?v=VlmpQq3sKhE

The reappearance of a long-lost body in the ice isn’t a new thing and will likely become more common as global climate change melts more ice, revealing the frozen corpses of people thought to be missing forever.