Tag Archives: Greenland

Record Warming and Melting of Greenland

These are admittedly daily data, and yes, it is warm in summer everywhere, and yes, when it is warm, snow and ice melt at the surface. Here is the latest image of Greenland’s warming and melting that I lifted (figure and caption) straight from today’s NASA release:

Extent of surface melt over Greenland’s ice sheet on July 8, 2012 (left) and July 12, 2012 (right). Measurements from three satellites showed that on July 8, about 40 percent of the ice sheet had undergone thawing at or near the surface. In just a few days, the melting had dramatically accelerated and an estimated 97 percent of the ice sheet surface had thawed by July 12. In the image, the areas classified as “probable melt” (light pink) correspond to those sites where at least one satellite detected surface melting. The areas classified as “melt” (dark pink) correspond to sites where two or three satellites detected surface melting. Image credit: Jesse Allen, NASA Earth Observatory and Nicolo E. DiGirolamo, SSAI and Cryospheric Sciences Laboratory


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Oceanography of Petermann Fjord and Glacier Melting

Trudy Wohlleben just send a group of scientists in Denmark, England, Canada, and the US the latest RADARSAT image of the ice island that formed in Petermann Glacier earlier this week.

RadarSat Image of Petermann Ice Island (PII-2012) and Glacier kindly provided by Trudy Wohlleben, Canadian Ice Service. The location of the hinge line is approximate only.

The current position of the remaining ice shelf of Petermann Glacier is the farthest landward since recorded observations. Dr. Croppinger was the first to provide a map of the glacier Continue reading

Petermann Glacier, Ice Islands, and Changing Climate

Petermann Glacier is a tidewater glacier in the remote north-west of Greenland. The glacier is grounded at about 600-m below sea level. It has calved two large ice islands, a 4-Manhattan sized island in 2010 and a 2-Manhattan sized one in 2012. These losses cover much of the area shown in this 2009 photo:

Eastern wall of Petermann Fjord as seen from CCGS Henry Larsen’s helicopter in August 2009 with the floating ice shelf. Most of the visible ice shelf has been lost during the 2010 and 2012 calving events. [Photo Credit: David Riedel, British Columbia.]

From selected imagery, I created a short movie (0.7 MB) which shows (a) the 2010 calving, (b) the advance of the new front in 2011 and early 2012, and (c) the 2012 calving. The glacier has moved at a rate of about Continue reading

Independence Fjord, Peary, and the First Thule Expedition

Independence Day 2012. Independence Fjord 1912. The mapping of northern Greenland.

I am reading 100-year-old travel reports by Danish polar explorers Knud Rasmussen and Peter Freuchen who visited Independence Fjord exactly 100 years ago to resolve a puzzles of Greenland’s geography: Is Peary Land an island or Greenland’s North? It is Greenland, but their detailed report has data I want: glaciers mapped, temperatures recorded, ice described, rocks sampled, musk ox killed. It is all part of an ongoing scientific journey of discovery and writing, but I am getting ahead of my Independence Day and Independence Fjord story:

Map of Greenland as included in the Report of the First Thule Expedition 1912 by Knud Rasmussen also showing contemporary expeditions across the Greenland ice sheet.

The Greenland mapping and early science was done painstakingly via sled dog teams by hardy people and adventurous spirits who had to find and hunt game to avoid death by starvation. Rasmussen, Freuchen, and their Inuit companions Uvdloriaq and Inukitsoq set out over Greenland’s inland ice from Thule on April 19, 1912 with 54 dogs to return 5 months later with only 8 dogs.

Ascent of the Inland ice in April 1912 as the First Thule Expedition starts from Clemens Markham’s Glacier to Independence Fjord. All 4 explorers returned, but only 8 of the 54 dogs did.

This was the First Thule Expedition that was supported by the Thule Trading Post at North Star Bay that Rasmussen and Freuchen had privately established in the fall of 1909. Today it is the location of Thule Air Force Base. My father-in-law served here for a year as a young Airman in the 60ies. It is also where our Nares Strait science party will board the Canadian Coast Guard Ship Henry Larsen Aug.-1, 2012. I am thinking of Peter Freuchen and his Inuit wife Naravana, Knud Rasmussen, and Independence Fjord on this Independence Day.

The Freuchen family on a visit to Denmark: Naravana, Pipaluk, Peter, and Mequsaq [Source: Freuchen, P., 1953: Vagrant Viking. Julian Messner Inc., NY, 312 pp.]

Independence Fjord in the summer of 2007 as seen from Kap Moltke looking south. [Source: web]

Independence Fjord in north-east Greenland was named by Robert E. Peary on America’s birthday 120 years ago on July 4, 1892 when he was the first white person to get there. Prehistoric people of the Independence cultures left artifacts from 3000 years ago. Hunting was good then, too. The 120 year old photograph of Peary shows him standing atop Navy Cliff next to a cairn with two Star Spangled Banners fluttering in the wind. The view eastward is along the 120 mile (200 km) long and 19 miles (30 km) wide Independence Fjord that opens into the Greenland Sea.

Peary at Navy Cliff, Greenland on July 4, 1892 atop Independence Fjord. [Photo Credit: Bowdoin College]

Note left by R.E. Peary on July 5, 1892 at a cairn at Navy Cliff overlooking Independence Fjord which he named here such. The darker pencil at the bottom is Peter Freuchen’s.

Peter Freuchen of the Thule expedition recovered Peary’s note 100 years ago. He then made and left a copy, added his own note, and headed home to Thule, Greenland. Besides checking on Peary the two Danes were also looking for a lost Danish expedition led by Einar Mikkelsen, who in turn was looking to recover the bodies of two Danish explorers of Independence Fjord, Ludvig Mylius-Erichsen and Niels Peter Hoegen-Hagen who had died nearby in 1907. Almost all these explorers have mountains, glaciers, land, and capes named after them or their sponsors, only Independence Fjord is different.

Independence Fjord celebrates the birthday of a young nation, the idea of a painfully evolving democracy, work still in progress. Peary may have made many claims that were not always supported by the evidence he presented, such as claiming to have reached the North Pole. He was no scientist, but a manager driving hard to secure funds, a ruthless self promoter, and autocrat assigning native women to men of his liking. But in this one instance of naming one of Greenland’s grand fjords Independence Fjord, he did good. Recall that this was the time when unelected kings, queens, generals, and dictators were ruling over expanding colonial empires. It was a few years before World War I and its follow-up World War II that caused global devastation to usher in a new set of world powers. The idea of independence is symbolized both in Independence Fjord and Independence Day. Both celebrate the same thing: freedom. There will be fireworks tonight …

P.S.: Some maps

North-East Greenland [Source: web]

MODIS-Terra imagery of Independence Fjord for June 18, 2012. Top panel shows reflectance in the near infra-red (1240 nm) emphasizing land while the bottom panel shows reflectance in the visible red (865 nm) emphasizing ice. The red dot indicates Navy Cliff, the vantage point at the western terminus of Independence Fjord with Academy Glacier to its south-east and Sophie Marie Glacier to its north-west.

Nares Strait 2012 Ice Arch Collapsing (Updated 6/30)

UPDATE-2 6/30:

June-30, 2012 MODIS-Terra view of the collapsing Nares Strait ice arch. The separation occured at the location where the hairline fracture developed 3 days ago. The collapse is propagating upstream to the north as the buttressing support on the western anchor point near Bache Peninsula and Pim Island was removed.

UPDATE-1 6/29:

June-29, 2012 MODIS-Terra view of the collapsing Nares Strait ice arch. The separation occured at the location where the hairline fracture developed 2 days ago.

The most relevant weather information is from Hans Island near 81 N latitude.

ORIGINAL Post (6/28/2012):
The collapse of the ice-arch in southern Nares Strait began June-27, 2012 with development of a small hairline fracture along the western side of the strait off Ellesmere Island, Canada. The fracture connects an isolated area of open water off Bache Peninsula, Canada at 79 N latitude. The front between land-fast ice in the north and the open water in the south has moved slightly southward. It has also lost a visible larger piece of ice that before anchored the bridge at its western connection to land. This motion will open the hairline fracture more, accelerating the collapse of the ice-arch. The missing support of the ice-arch on its western side will collapse the entire ice-arch and the previously land-fast ice of Nares Strait will stream rapidly to the south, I predict, before this weekend.

Updates (including an animation) will be posted daily at http://muenchow.cms.udel.edu/Nares2012/Kane/.

Ice-bridge at southern Nares Strait June-26, 2012 23:30 UTC from MODIS-Terra. There are no hairline fractures yet along the Ellesmere Island side near 79 N latitude. Greenland is on the right (east), Canada on left (west).

Ice-Bridge at southern Nares Strait on June-27, 2012 17:40 UTC from MODIS-Terra. Notice the crack and hairline fractures in the ice along the Ellesmere Island coast near 79 N latitude and 75 W longitude.

This collapse happens each year in the summer, though the timing varies from April for weak and July for strong arches. The arch in 2012 lasted longer than the one in 2011. No or only weak ice-arches formed at this site in 2007, 2008, and 2009, e.g., http://muenchow.cms.udel.edu/MODIS/.

EDIT-1: Same imagery, same gridding, but more focus and detail

MODIS-Terra June-26, 2012 prior to collapse.

MODIS-Terra June-27, 2012 at the onset of collapse. Note the change near the Canada at 79 N latitude where open waters meets the sea ice.

EDIT-2: The moorings we try to recover this summer are to the north of Kane Basin and to the south where Petermann Fjord enters Nares Strait. This map shows it (also notice how badly the coastline of Greenland is surveyed):

June-10, 2012 MODIS-Terra image showing location of moored array that was deployed in Aug. 2009 to be recovered in Aug. 2012.