Kangiata Sermia, Retreat Southwest Greenland

Kangiata Sermia is an outlet glacier in Southwest Greenland that empties into the Kangersunaq fjord east of Nuuk. Thomas et al (2009) noted that Kangiata Glacier thinned most notably near its terminus decrasing up glacier to negligible thinning 30 km inland. They further found that the glacier bed was above sea level 40 km inland. Sole et al (2010) observed variations in the velocity of this glacier and found that there was a substantial spring speedup as the melt season began and then an even more significant slowdown for most of the summer. They noted that the net effect of the summer speed variations on annual motion is small (∼1%), indicating the lack of a meltwater induced overall acceleration. The velocity figure below is from Figure 4 of Ahlstrom et al (2013), indicating the annual velocity minimum is in late summer. Box and Decker (2011) noted that glacier retreated 100 meters/year from 2000 to 2010.
kangitata overview
Google Earth image

kangiata
Thomas et al (2009) Figure showing the bedrock and surface profile of Kangiata Sermia

kangiata velocity
Ahlstrom et al (2013) Figure showing seasonal velocity change of Kangiata Sermia

Here we examine Landsat imagery of the glacier from 1987 to 2013 to identify changes. In 1987 the two main termini of the glacier were joined, down fjord of an island that separates the two branches. The terminus in each image is indicated by red dots, the yellow arrow note an island in the middle of a peripheral ice dammed proglacial lake, the pink arrow a minor terminus on the north side of the island and the orange arrow a medial-lateral moraine comples extending into the glacier. By 2001 the glacier terminus has separated into two parts, with a retreat of jsut over 1 km in the 14 years. The proglacial lake is still full, yellow arrow. The upglacier minor terminus is developing a lake at its terminus as it retreats. The orange arrow indicates the expansion of the moraine complex as the glacier thins. By 2006 the main terminus has continued to retreat up the south side of the island 1.5 to 2 km since 2001. The proglacial lake level has declined and the island has become a peninisula. The thinning ice is simply not able to impound as deep or large a lake. The minor terminus at the pink arrow has developed a lake that is over 1 km long. In 2013 the changes from 2006 are limited, the moraine complex has continued to expand. The overall retreat from 1987 to 2013 is 3 km. The retreat is similar to that of Narssap Sermia , Kuussuup Sermia, and Qaleraliq as each responds to the climate warming. The lake is a bit larger, though the lake does fluctuate through an annual cycle filling and draining. Google Earth imagery indicates the lake at an even lower level, it no longer fills to nearly the level of 2001. This lake is similar to Tiningnilik in its size and location, but has lost more of its volume. The lake at the pink arrow is 1.2 km long. Each winter the fjord in front of the glacier freezes and the terminus protected from calving can advance. The Google Earth closeup image indicates the heavily crevassed nature of both termini indicative of rapid flow. On April 2, 2014 the fjord is quite filled with sea ice to the southeast bend 50 km from the terminus. The terminus is not distinct in this particular image. kangiata 1987
1987 Landsat image
kangiata 2001
2001 Landsat image
kangiata 2006
2006 Landsat image

kangiata 2013
2013 Landsat image

kangiata lake
2012 Google Earth image

kangiata term
2012 Google Earth image

kangiata sermis april 2014
April 2 2014 MODIS Image

Reichert Glacier Rapid Retreat, Northern Patagonia Icefield, Chile

Reichert Glacier (Reicher) is at the northwest corner of the North Patagonia Icefield (NPI) and flows west from the Mont Saint Valentin region and ends in the expanding Reicher Lake. Rivera et al (2007) notes that the glacier was named for French geologist Federico Reichert, but that Reicher has ended up as the established spelling. They further note that the glacier lost 4.2 square kilometers of area from 1979 to 2001 and had an ELA of 1330 m. The glacier has two main icefalls, one at the first bend in the glacier above the terminus at 400 m, the second at the ELA from 1100-1600 m. Davies and Glasser (2012) identify the most rapid area loss of -0.77% per year to the 1986-2001 period. The glacier retreated rapidly from 1987-1997, but the terminus was stabilized from 1997-2001, before retreating again to near the 2014 terminus by 2002.
reicher glacier ge 2013
2013 Google Earth image
Here we examine Landsat imagery from 1986, 1997 and 2014 to document the changes. The pink arrow indicates the 1987, terminus, the yellow arrow the 1998 terminus and the red arrow the 2014 terminus. In 1987 the glacier terminates close to the southern end of Reicher Lake, pink arrow. By 1998 the glacier has retreated to the yellow arrow and is terminating on the west side of Reicher Lake across the lake from the main glacier valley. By 2014 the glacier has retreated into the main glacier valley and Reicher Lake extends 8.8 km from the northeast to southwest. A new lake has developed in 2014 above the first icefall, orange arrow. This lake indicates a potential second lake basin beginning to develop in the glacier reach above the first icefall. If this is the case another rapid retreat will ensue, though not in the immediate future. The glacier retreated 6.7 km from 1987 to 2014, with 90% of the retreat occuring by 2002. Area extent loss is 8-9 square kilometers. The lower icefall is 1.5 km from the current terminus, and indicates the maximum extent of Reicher lake and the retreat that can be enhanced by calving into that lake. This glacier has followed the pattern of the neighboring Gualas Glacier just to its south. WHOI-Oceanus recently published an interesting article on this glacier. The retreat is emblematic of the entire NPI as noted by both Rivera et al (2007) and Davies and Glasser (2012) work, the latter had an excellent Figure 8 indicating two periods of fastest recession since 1870, are 1975-1986 and 2001-2011 for NPI glaciers. This retreat includes that of Steffen Glacier, Nef Glacier, and Colonia Glacier.

reicher  glacier 1897
1987 Landsat image

reicher glacier 1998
1998 Landsat image

reicher glacier 2014
2014 Landsat image

North Cascade Glacier Climate Project 2013 Field Report

The 2013 winter season provided close to average snowpack in the North Cascades as indicated by the average SWE at SNOtel stations in the range. The summer melt season has proved to be long, warm and dry. The May-August mean temperature at the station closest to a glacier, Lyman Lake, has been tied for the 2nd warmest in the last 25 years with 2009 and only 2004 warmer. The summer has lacked record periods of warmth and has featured sustained warm temperatures and higher than average humidity, reducing the number of nights when the glacier surface has frozen. The average minimum temperatures at Lyman Lake are the highest in the last 25 years for July and August. The humidity was the strikingly high during our field season, note diagram from a Cliff Mass article on the topic. The net result will be significant negative glacier mass balances in the North Cascades. There is one month left in the melt season most glaciers are close to an equilibrium balance already.

The field team included Stewart Willis and Matt Holland, Western Washington University, Jill Pelto, U of Maine, Ben Pelto, UMass,-Amherst, Jezra Beaulieu and Oliver Grah, Nooksack Indian Tribe research scientists And Tom Hammond, North Cascade Conservation Council. Alan Kearney, Photographer worked with us for the first week capturing time lapse imagery of our work.

After a month of perfect summer weather we arrived to a foggy and wet conditions on the Columbia Glacier. The Columbia Glacier terminus was exposed and has retreated 85 m since 1990. The glacier had a substantial area of blue beginning 200 m above the terminus and extending along the western side of the basin for 400 m. The area of blue ice on August 1 was 50,000 square meters, by Aug. 21 the area had expanded to 200,000 square meters, the shift of the 2013 winter snowline during this period indicates a melt of m during the three weeks.


The Lower Curtis Glacier terminus was exposed early in the summer resulting in a continued retreat of 20 m since 2011, the area of thick seraced terminus lost since 1990 has been 60,000 square meters. The lateral retreat and terminus retreat since 1990 are both in the 125-150 meter range depending on location.
We spent a week observing ablation and resulting glacier runoff on Sholes Glacier. With Oliver Grah and Jezra Beaulieu who work for the water resources section of the Nooksack Indian Tribe we emplaced a stream gage right below Sholes Glacier and one on Bagley Creek which is snowmelt dominated. With the water level gages in we all began work on a rating curve for the Sholes Glacier site directly measuring discharge on 14 occasions, kayak socks helped reduce the impact of cold water. Average ablation during the week was 8.25 cm/day of snowpack or 5 cm of water, discharge measurements identified a mean of 5.2 cm/day of from the glacier during this period. The agreement between ablation and discharge was a nice result. Discharge became notably more turbid after 1 pm, peaking in turbidity around 5 pm. Of equal interest was the change in snowcovered area. On July 19th a Landsat image indicated 100% snowcover for Sholes Glacier. On Aug. 4th our surface measurements indicates a blue ice area of 12,500 square meters, which is also evident in a Landsat image from that day. By Aug. 20th a satellite image indicates that the blue ice area had expanded to an area of square meters. This coincided with the area where snowdepth was observed to be less than 1.2 m on Aug.4. This represents a volume loss of 592,000 cubic meters of water in 16 days.
We measured the mass balance on Rainbow and Sholes Glacier during this period. The snowpack was poor on both, especially above 1900 meters on Rainbow Glacier. Typical depths are over 5-6 m, this year 3.75-4.5 m. The poor snow depths were also noted on the Easton Glacier above 2000 m in crevasse stratigraphy measurements. Each crevasse is approached probing to ensure it is safe and then assessed to make sure the crevasse is vertically walled, this enables a safe but also accurate measure. In some cases layers from mulitple years can be assessed. IN the Lynch Glacier crevasse the 2013 layer will be lost to melt before end of the summer. Easton Glacier had a terminus that was fully exposed by the start of August. The terminus slope has thinned markedly in the last three years as retreat has continued. The retreat of Easton Glacier has averaged 10 m/year from 2009-2013. This year the retreat will exceed that with two months of exposure. The Deming Glacier retreat has been exceptional over the last 12 months with at least 30 m of retreat. The snowline on Easton Glacier was at 1850 m on Aug. 10th. By the end of August the snowline had risen to 1980 m, where snow depths had been 1.5 m three weeks previous. The mass balance of Sholes, Rainbow and Easton Glacier will all be close to – 1 meters water equivalent, that is losing a slice of glacier 1.1-1.2 m thick. Mount Daniels had the best snowpack of any location in the North Cascades. On the small and dying Ice Worm Glacier ablation and runoff were assessed simultaneously. The expansion of the area where 2013 has all melted expanded rapidly from 8/13 to 8/21. The glaciers lower section had is often avalanche buried, this year the snowpack was gone on much of the lower section. However, snowpack averaged 1.7 m across the entire glacier on August 14th. With daily ablation of 7-8 cm/day this will be gone by early September. This will lead to a substantial negative mass balance this year. Lynch and Daniels Glacier both had limited exposed blue ice and firn, and snowpack values that were slightly above average. Both glaciers will have small negative mass balances this year. On Lynch Glacier a large crevasse at exposed the retained snowpack of the last three years, from 2010-2012 5 m of firn remains. ice worm 2013

ice worm 821upelto team
Ben in his 9th year, Jill her 5th year and Mauri 30th year of glacier work in the North Cascades

Juneau Icefield Glacier Terminus Change from Landsat 5 1984 to Landsat 8 2013

The Juneau Icefield Research Program (JIRP) has been examining the glaciers of the Juneau Icefield since 1946. Until the NASA Landsat program began field measurements and aerial observations were the only means to observe the glaciers of the icefield. For more than 40 years it was Maynard Miller, U of Idaho, who led this expedition that has trained so many of today’s glaciologists, today it is Jeff Kavanaugh, U of Alberta. Given the difficult weather conditions that produce the 4000+ square kilometers of glaciers, this was not a task that could be done comprehensively. Here we examine the changes from the August 17, 1984 Landsat 5 image to the June 21, 2013 image from newly launched Landsat 8. Landsat 5 was launched in 1984, Landsat 8 launched in 2013. The Landsat images have become a key resource in the examination of the mass balance of these glaciers (Pelto, 2011). The August 17th 1984 image is the oldest Landsat image that I consider of top quality. I was on the Llewellyn Glacier with JIRP on the east side of the icefield the day this image was taken. On June 21, 2013 JIRP’s annual program had not begun, but the field season is now underway once again observing fin and reporting from the field across this icefield.
Post reblogged at NASA

First we have the two reference images of the entire icefield that indicate the location of the 12 main glaciers we focus on here. Followed by a chart indicating the amount of terminus change, 14 glaciers have retreated and one has advanced.
This is followed by 12 closeup glacier by glacier comparisons of the terminus, with the 1984 image always on the left and 2013 on the right, the 1984 margin is marked with red dots and the 2013 with yellow dots. This is an update to an examination of the Juneau Icefield terminus changes from 1948 to 2005. There are also links to more detailed discussions for each glacier, as the focus here is on the 1984 to 2013 changes visible in the images here. The images were first overlain in ArcGIS and the terminus change based on three measurements one at the glacier terminus midpoint, one each halfway to the margin from the mid-point. The exception is the Taku Glacier which is based on the JIRP field measurement mean and the Llewellyn where three measurements are made on each of the two termini, the average is then rounded to the nearest 100 m. The ongoing retreats reflects the long term negative mass balance of the glaciers with the exception of the Taku Glacier. The ongoing warming of our globe will continue to lead to retreat. The glaciers are all fed from the central portion of the icefield that always has a large snow covered area even at the end of recent warm summers.
juneau icefield 1984
August 17, 1984 Landsat 5 image: N=Norris, L=Lemon Creek, M=Mendenall, H=Herbert, E=Eagle, G=Gilkey, A=Antler, F=Field, LL=Llewellyn, Tu=Tulsequah, TW=Twin and T=Taku.

Juneau icefield 2013
June 21, 2013 Landsat 8 image

JIF terminus
1984-2013 chart of terminus change of individual glaciers from 1984 to 2013, see individual images below for the observed changes.

norris glacier change
From 1984 to 2011 Norris Glacier has retreated 1100 m. The glacier terminus that has been ending in a proglacial lake for the last 40 years is now mostly grounded. Since 1984 the northern half of this lake has formed and the long term lake development is discussed in a more detailed discussion on Norris Glacier.

lemon glacier change
In 1984 Lemon Creek Glacier (L) has pulled back 300 m from a small lake it reached in 1984. Lemon Creek Glacier has a long term mass balance record that indicates more than 15 m of thinning from 1984 to 2012. This thinning is more dramatic than the 300 m retreat that has occurred. The yellow arrow indicates a tributary that no longer connects to the glacier.

mendenhall glacier change Mendenhall Glacier is the most visited and photographed terminus in the region. The glacier in 1984 ended at the tip of a prominent peninsula in Mendenhall Lake. By 2013 the terminus has retreated 1200 m, with an equal expansion of the lake. The red arrows indicate a tributary that decreased dramatically in width and contribution to the main glacier. This is the location of Suicide Basin, where a lake has formed the last two summers and then rapidly drained. A nice set of images of the glacier are provided by Matt Beedle.

herbert glacier change
Herbert Glacier has retreated 600 m since 1984. The width of the terminus has also declined. The red arrow indicates a tributary that no longer feeds the main glacier.

eagle glacier change Eagle Glacier has retreated from the edge of a lake in 1984. The retreat of 1100 m is rivaled by the width reduction of the glacier in the lower 3 km. Eagle Glacier‘s ongoing retreat is examined in more detail.

gilkey glacier change Gilkey Glacier had begun to retreat into a proglacial lake by 1984, the lake was still just 1 km long. A short distance above the terminus the Gilkey was joined by the sizable tributaries of the Thiel and Battle Glacier. By 2013 the glacier has retreated 3200 m, the lake is now 4 km long. Thiel and Battle Glacier have separated from the Gilkey Glacier and from each other. Thiel Glacier retreated 2600 m from its junction with Gilkey Glacier from 1984-2013 and Battle Glacier 1400 m from its junction with Thiel Glacier

antler glacier 2013 Antler Glacier is actually a distributary glacier of the Bucher Glacier, which in turns joins the Gilkey Glacier. As this glacier has thinned, less ice has overtopped the lip of the valley that Antler occupies. In 1984 Antler Glacier was 3 km long descending the valley to end near a proglacial lake, that it had recently occupied. By 2013 the glacier was just 400 m long, having lost 2600 m of its length.

field glacier change Field Glacier in 1984 ended at the edge of an outwash plain with a few glimpses of a lake developing near its margin. By 2013 a substantial lake has formed at the terminus and the glacier has retreated 2300 m. A lake has also developed at the first terminus joining from the east, most of the width of this glacier has been lost. It is clear that the two lakes will merge as the retreat continues.

lewellyn glacier change The second largest glacier of the icefield is the Llewellyn Glacier which is in British Columbia. The glacier has several termini, here we examine two of them that have retreated 900 m from 1984-2013. Hoboe Glacier is another terminus that has been examined, but not in this post. This has led to formation of new lakes, and water level changes in existing lakes. Matt Beedle has examined the recent changes at the terminus.

tulsequah glacier change Tulsequah Glacier in 1984 ended at an outwash plain with a small marginal lake beginning to develop, red arrow. By 2013 a large proglacial lake has developed due to the 2500 m retreat. A side valley down which a distributary tongue of the glacier flowed in 1984 has retreated out of the valley by 2013, pink arrow.

twin glacier change The East and West Twin Glacier are receding up separate fjords, though they are fed from a joint accumulation zone. The East Twin is a narrower glacier and has retreated 900 m. The West Twin has retreated 600 m, at an elbow in the fjord. Elbows like this are often good pinning points that are a more stable setting, once the glacier retreats out of the Elbow retreat should speed up.

taku Glacier change Taku Glacier is the largest glacier of the icefield and unlike all the others it has been advancing non-stop over the last century. The sustained positive mass balance from 1946-2012 has driven this advance (Pelto, 2011), this led to the glacier thickenning along its entire length. Since 1950 observations of velocity near the snowline of the glacier by JIRP indicates that the glacier has had a remarkably steady flow over the past 50 years (Pelto et al, 2008). Since 1988 the glacier has not been thickening near the snowline as mass balance has declined. We have been able to observe the snowline movement in satellite images to help determine the mass balance. The changes at the glacier front are quite variable as the glacier advances. JIRP measurements of the terminus indicate this from 2001-2008 with an interactive map from Scott McGee, indicating advances in some area, minor retreat in others and back and forth in others. In 2012 JIRP was back at the terminus creating the map below. There is no change at the east and west side of the margin since 2008 and 55 to 115 m of advance closer to the center.

TakuTerminusSurvey2012

Stephenson Glacier retreat, Heard Island

The Australian Antarctic Division manages Heard Island Island and has undertaken a project documenting changes in the environment on the island. One aspect noted has been the change in glaciers. The Allison, Brown and Stephenson Glacier have all retreated substantially since 1947 when the first good maps of their terminus are available. Fourteen Men by Arthur Scholes (1952) documents a year spent by fourteen men of the Australian National Antarctic Research Expedition. Their visit to the glacier noted that they could not skirt past the glacier along the coast. After crossing Stephenson Glacier they visited an old seal camp and counted 16,000 seals in the area Ensuing mapping and aerial photography has enabled a sequence of glacier boundary maps to be created that illustrate the changes in the glaciers. Thost and Truffer (2008) noted a 29% reduction in area of the Brown Glacier from 1947-2003. They also observed that the volcano Big Ben that the glaciers all drain from has shown no sign of changing geothermal output to cause the melting and that a 1 C warming has occurred over the same time period. Stephenson Glacier extends 8-9km down the eastern side of Big Ben. it 1947 it spread out into a piedmont lobe that was 3 km wide and extended to the ocean in two separate lobes around Elephant Spit. A picture from the Australian Antarctic Division taken in 1947 shows the glacier reaching the ocean and then in 2004 from the same location. around then broadens to form a piedmont lobe up to -3 km wideKiernan and McConnell (2002) an order of magnitude increase in the rate of ice loss from Stephenson Glacier after 1987. Retreat from the late 19th century to 1955 had been limited. As Kiernan and McConnell observed retreat began to increased and by 1971 the glacier had retreated 1 km from the south coast and several hundred meters from the northern side of the spit. This retreat by 1980 caused the formation of Stephenson Lagoon and by 1987 Doppler Lagoon had formed as well. After 1997 the two lagoons have joined as Stephenson Glacier has retreated rapidly. The terminus is now 2.2 km from the south coast and 3.1 km from the north coast. The highly crevassed area above the terminus indicates the rapid ongoing flow of the glacier. The terminus is highly fractured in Google Earth Imagery indicating this section will continue to retreat via calving of icebergs into the lagoon, which is quite full as it is. The first image below shows the terminus location over the last 60 years from the Australian Antarctic Division. The second image are the AAD overlays that can be imported into Google Earth. The last image is a closeup of the still disintegrating terminus into the combined lagoons from 2008. The Stephenson Glacier is undergoing a rapid calving retreat that began due to ongoing mass balance loss. This mass balance loss is shared by the other glaciers on the island are observations, though the actual terminus retreat may be less the volume losses of Brown Glacier recently have been large.

Rwenzori Glacier Retreat-Loss

The Rwenzori Range,Uganda typically referred to as Mountains of the Moon have been rapidly losing their glacier cover. The small, steep glaciers descend the peaks of Mt. Stanley: 5111 m, Mt. Speke: 4891 m and Mt. Baker:4873 m. The Georg Kaser, University of Innsbruck visited the range twice in the early 1990’s to prepare maps of glacier change to compare to a 1906 map derived from documents of the Duke of Abruzzi’s expedition, the 1955 map made from vertical air-photos. They determined the area of the glaciers to be 6.5 km2 in 1906, 3.2 km2 in 1955 and 1.7 km2 in the 1990’s, note Speke Glacier as an example. This represents a 70% area loss. An updated satellite based analysis by Texas A&M’s Klein and Kincaid showed that the glaciers in the Rwenzori have decreased in area from 2.55 km2 in 1987 to 1.31 km2 in 2006. I have had the good fortune to work in the field with both Georg Kaser, Taku Glacier, Alaska and Andrew Klein, Easton Glacier, Washington, both have made tropical glaciers one of their specialties. This is nearly a 50% loss in 20 years. The climate trends and glacier extent trends are not in favor of the glaciers lasting for long. This is reinforced by a comparison of images from Mount Stanley from the World Wildlife Fund.

Helm Glacier Melting Away-2014 Video Update

It is clear that the business model for glaciers in our current climate is not working. The Helm Glacier in the Coast Mountains of southwest British Columbia is an example of this.  Helm Glacier has been the focus of annual mass balance surveys since 1967. During the 1984-2013 period its mass balance losses have been the greatest of any of the 16 glaciers monitored in North America. The mass balance loss has been about 32 m of water equivalent, about 35 m of ice thickness lost. This is less than losses on other nearby glaciers like Spearhead Glacier but more than others such as Warren Glacier. The regional volume loss has impacted even the large glaciers Bridge Glacier and small glaciers. The loss is more than 30% of the Helm lost in just 25 years, and the trend mirrors that of all glaciers in the Pacific Northwest. Helm Glacier also fits into the pattern of glacier retreat across Canada, Canadian Glacier Retreat index.  NAM ba 2013The glacier had an area of 4.3 square kilometers in 1928. Today the area has declined by 78% to 0.92 square kilometers. In 1928 the glacier is not too distant from its Little Ice Age moraines. The trimlines of recently deglaciated terrain are clear. The glacier has two termini, one draining north and the other west. Today in the picture from Johannes Koch, there is a vast expanse of newly deglaciated terrain that as yet lacks significant vegetation. The western terminus is gone.
Remainder of post and updates moved to
Helm Glacier