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The World's Glaciers


knocker

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Posted
  • Location: Camborne
  • Location: Camborne

Orjaffa cakesuup Tasia Glacier slowdown, SW Greenland

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Pelto et al (1989) after a field campaign we mounted in 1985 and 1986 on Jakobshavns Glacier noted that the velocity was essentially the same in the summer of 1964, 1976, 1978, 1985 and 1986.  Further we observed that the agreement between surface mass-balance and volume-flux calculations, suggested that “Jakobshavns Isbrae: is almost in a state of equilibrium”. The point of the study was to establish a baseline of velocity before the anticipated acceleration due to warming. This acceleration due to warming happened beginning in 1992 from 20 m/day at the calving front in 1985 to 46 m/day in 2012, comparing the same locations the annual speed increase was 282% from 1992 to 2012 (Joughin et al 2014).  The Jakobshavns Isbrae is a tidewater glacier, just south of the glacier the margin of the ice sheet is dominated by a land terminating section that has a different dynamic response to warming.

 

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Posted
  • Location: Camborne
  • Location: Camborne

Endurance Glacier, Elephant Island Retreat

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Endurance Glacier is the main outlet glacier of this heavily glaciated island of the South Shetland Islands. The name of the island comes from the numerous elephant seals. The name of the glacier comes from the Ernest Shackleton and his crew from the Endurance reaching the island in 1916 after a journey in open boats, following the loss of their ship Endurance in Weddell Sea ice.  Amazingly 28 men somehow survived the trip to Elephant Island. The name is also appropriate as it takes real endurance to visit and observe the glacier as is evident in the lack of observations on this glacier. I have been waiting since the launch of Landsat 8 in 2013 for a reasonably clear image of this obviously cloudy area. The December 16th, 2015 image is that image. here we examine the changes in this glacier from 1990 to 2015 using Landsat images. Endurance Glacier has 6 km wide calving front facing the open ocean. The glacier is heavily crevassed in the center near the calving face. This glacier must be exposed to as much wave action as any glacier in the world, since it lacks sea ice protection from November-May.

 

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Posted
  • Location: Camborne
  • Location: Camborne
  • 1 month later...
Posted
  • Location: Camborne
  • Location: Camborne

A Lake in Bolivia Dries Up

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In December 2015, while the world’s eyes were on the UN Climate Conference in Paris, Bolivia’s Lake Poopó—once the country’s second-largest lake, with an area of 2700 square kilometers–dried up completely. This event was first recognized by the regional government, located in Oruro, and soon drew national and international concern. This attention has opened a discussion on the causes of this event and on the troubling possibility that the lake may never return to its earlier size.

http://glacierhub.org/2016/02/25/a-lake-in-bolivia-dries-up/

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Posted
  • Location: Camborne
  • Location: Camborne

Rapid glacial retreat on the Kamchatka Peninsula during the early 21st Century

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Abstract. Monitoring glacier fluctuations provides insights into changing glacial environments and recent climate change. The availability of satellite imagery offers the opportunity to view these changes for remote and inaccessible regions, often underrepresented in glacial inventories. Gaining an understanding of the ongoing changes in such regions is vital if a complete picture of glacial fluctuations globally is to be established. With this in mind, here we use satellite imagery (Landsat 7, 8 and ASTER) to conduct a multi-annual remote sensing survey of glacier fluctuations on the Kamchatka Peninsula (Eastern Russia) over the 2000–2014 period. Glacier margins were digitised manually, and reveal that in 2000, the peninsula was occupied by 676 glaciers, with a total exposed-ice area of 664.8 ± 23.9 km2. By 2014, the number of glaciers had increased to 766 (reflecting the fragmentation of larger glaciers), but their surface area had decreased to 465.1 ± 15.7 km2. This represents a ~ 30 % decline in total glacier surface area between 2000 and 2014, and a notable acceleration in the rate of area-loss since the late 20th century. Analysis of possible controls indicates that these glacier fluctuations were likely governed by variations in climate (particularly rising summer temperatures), though the response of individual glaciers was modulated by other (non-climatic) factors, principally glacier size and local shading.

http://www.the-cryosphere-discuss.net/tc-2016-42/?utm_source=twitterfeed&utm_medium=twitter

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Posted
  • Location: Camborne
  • Location: Camborne
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An estimated 80 percent of Switzerland’s annual water supply will be “missing” by 2100, as glaciers in the Alps retreat under rising temperatures. A recent study by Swiss and Italian researchers addresses this anticipated loss by exploring whether dams could replicate the hydrological role of glaciers. Like glaciers, the dams would contain and store melangel delighters at high elevations in the valleys where the glaciers once resided.

http://glacierhub.org/2016/06/29/damming-switzerlands-glaciers/

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