Subglacial Drainage Under a Valley Glacier in the Yukon
From The Cryosphere: “The subglacial drainage system is one of the main controls on basal sliding, but remains only partially understood. Here we use an 8-year dataset of borehole observations on a small, alpine polythermal valley glacier in the Yukon Territory to assess qualitatively how well the established understanding of drainage physics explains the observed temporal evolution and spatial configuration of the drainage system.”
Extremophiles at Deception Island Volcano in Antarctica
From Extremophiles: “Deception Island is notable for its pronounced temperature gradients over very short distances, reaching values up to 100 °C in the fumaroles, and subzero temperatures next to the glaciers. Our main goal in this study was to isolate thermophilic and psychrophilic bacteria from sediments associated with fumaroles and glaciers from two geothermal sites, and to evaluate their survivability to desiccation and UV-C radiation. Our results revealed that culturable thermophiles and psychrophiles were recovered among the extreme temperature gradient in Deception volcano, which indicates that these extremophiles remain alive even when the conditions do not comprise their growth range.”
From The Guardian: “A valley in Yellowstone National Park in Wyoming, formed by a glacier, may get a new name. Hayden Valley is glacial, dating back to the last Ice Age. It was named after a surveyor, Dr. Ferdinand V. Hayden who advocated removing Native Americans from the region. The Great Plains Tribal Chairman’s Association, comprising tribal chairmen of 16 Sioux tribes from Nebraska and the Dakotas, is pursuing an application to change the name of Hayden Valley to Buffalo Nations Valley.”
From Microbiology Society: “A cold-tolerant, translucent, yellow-pigmented, Gram-stain-positive, non-motile, rod-shaped bacteria was isolated from snow of the Zadang Glacier on the Tibetan Plateau, PR China. 16S rRNA gene sequence similarity analysis indicated that the isolate was closely related to Conyzicola lurida KCTC 29231T and Leifsonia psychrotolerans DSM 22824T at a level of 97.72 and 97.49 %, respectively. Other close relatives had a 16S rRNA gene sequence similarity of less than 97 %… Based on phenotypic and chemotaxonomic characteristics, strain ZD5-4T was considered to represent a novel species of the genus Conyzicola, for which the name Conyzicola nivalis sp. nov. is proposed.”
U.S. Geologist Clarence King’s Poetic Mount Shasta
From Project MUSE: “But, for all his complexities, King’s recorded observations of wilderness places rise above his life’s convolutions. Unfortunately, what escapes many scholars is the remarkableness of King’s writing, an irony considering its salience; in fact, King’s brilliance is best illustrated in his lexical finesse, poetic flights of language, and artistic verisimilitude of nature’s beauties.”
Learn more about the poetic perceptions and mastery of language of the late geologist Clarence King here.
New Insights on Glacier Meltwater
From Geophysical Research Letters: “Arctic river discharge has increased in recent decades although sources and mechanisms remain debated. Abundant literature documents permafrost thaw and mountain glacier shrinkage over the past decades. Here we link glacier runoff to aquifer recharge via a losing headwater stream in subarctic Interior Alaska. Field measurements in Jarvis Creek (634 km2), a subbasin of the Tanana and Yukon Rivers, show glacier meltwater runoff as a large component (15–28%) of total annual streamflow despite low glacier cover (3%)… Our findings suggest a linkage between glacier wastage, aquifer recharge along the headwater stream corridor, and lowland winter discharge. Accordingly, glacierized headwater streambeds may serve as major aquifer recharge zones in semiarid climates and therefore contributing to year-round base flow of lowland rivers.”
Much to the alarm of Canadians, the glacier-fed Slims River has disappeared following extensive glacial melting associated with anthropogenic climate change. Views of the Slims Valley, where the river once flowed, have been replaced by a dry plain, marked only by the sinuous bevels left behind by the river in the soil. These changes have major implications on local ecosystems and will inevitably result in lower water levels in downstream glacial lakes.
For example, for many years, the Yukon’s Kluane Lake has been fed by the continuous flow of the Slims River. Water in the Slims River had been transported from Kaskawulsh Glacier, feeding the Kluane Lake and flowing into the Bering Sea. The Kaskawulsh Glacier is a large temperate valley glacier that lies in the St. Elias Mountains. It measures more than four miles across at its widest, where it meets the Slims and Kaskawulsh Rivers. With the recent melting of the glacier, water has been diverted in the direction of the Kaskawulsh River, which drains nearly 500 kilometers away in the Gulf of Alaska.
Jeff Bond of the Yukon Geological Survey stated to Paul Tukker of CBC News, “Folks have noticed this spring that the [river has] essentially dried up.” This loss of streamflow is the first regional occurrence in the last 350 years, according to the Yukon Geological Survey. Some of the warmest temperatures on record in 2015 and 2016 have had major implications on glacial health in the region, with ice loss reported throughout the surrounding Saint Elias Mountains, as reported by the National Oceanic and Atmospheric Administration (NOAA).
The rangers in the Kluane National Park noted that the Kaskawulsh Glacier has retreated nearly a half mile to the point where its melt water is now traveling in a completely different direction. In this case, the diversion of glacial meltwater is so substantial that no water is flowing in the direction of the Slims Valley and the downstream Bering Sea. Despite the Slims normally flowing approximately 19 kilometers from the edge of the glacier to Kluane Lake through the Slims Valley, changes to the Kaskawulsh’s spatial distribution have caused meltwater to flow not westward but to the east, flowing into the Pacific Ocean.
The change in water patterns has major implications for ecosystems in regions experiencing new levels of flow (both in the dryer and the now wetter areas). For example, in the absence of perennial water, the Slims Valley is more prone to dust storms, at least until new vegetation stabilizes the floodplain. Retired Utah Geological Survey geomorphologist Will Stokes told GlacierHub, “The valley may undergo a major ecological evolution over the next few decades, characterized by new flora and fauna.” Although this may seem like a minor adjustment, Stokes explained, “These changes can drastically alter the local food chain, and if lake levels end up lowering dramatically, there may be a major negative impact on local hunting and fishing.”
Jeff Bond further speculated to CBC News that the melt-water system which fed the Slims Valley may have only been a temporary outflow from the Kaskawulsh Glacier, representing a “300-year blip” on a much longer geological timescale in which large glaciers evolve. A study by Harold Borns in the American Journal of Science supports the notion that water began flowing northward around the year 1700, when climatological events caused the glacier to advance, ultimately diverting a large portion of snowmelt towards the Slims Valley and creating the Kluane Lake. This relationship illustrates the impact that regional climate has had on glacial events, with recent warming reversing the changes that occurred in a colder climate multiple centuries ago.
“Although it’s hard to tell how much lake levels in the Kluane will decrease, locals can expect an abrupt decrease in levels,” Stokes added, “followed by a much slower, long-term loss of water once levels stabilize.”
The Yukon Geological Survey postulates that water levels in Kluane Lake will lower by a meter or more in the foreseeable future. Although the Kluane National Park region is not densely populated by humans, lower water levels in the Kluane may stress trout and whitefish populations that are fished throughout the region’s warm months by both locals and visitors.
Although the diversion of water away from downstream communities may, in this case, be unsurprising to Yukon geologists in hindsight, it does shed light on the powerful effects of warmer temperatures and evolving climate dynamics on natural landscapes. The flow of rivers and plentiful caches of freshwater that exist in many regions due to glacial activity may be at serious risk as melting continues and water flow is redistributed.
It is difficult to tell how quickly changes like those that have occurred in the Yukon may happen in the future, yet these events may serve as a microcosm for the forthcoming state of glacial systems in light of anthropogenic climate change. Despite the ongoing study of glacial evolution by earth scientists, events like this in the Yukon really catch the attention of locals and illustrate first hand the effects of living in a warmer world.
Obama: Climate Change ‘Could Mean No More Glaciers In Glacier National Park,’ Statue of Liberty
“During Saturday’s Weekly Address, President Obama stated, “the threat of climate change means that protecting our public lands and waters is more important than ever. Rising temperatures could mean no more glaciers in Glacier National Park. No more Joshua Trees in Joshua Tree National Park. Rising seas could destroy vital ecosystems in the Everglades, even threaten Ellis Island and the Statue of Liberty.”
To read the full transcript of the President’s Weekly Address, click here.
Melting Glaciers Pose Threat Beyond Water Scarcity: Floods
From VOA News:
“The tropical glaciers of South America are dying from soot and rising temperatures, threatening water supplies to communities that have depended on them for centuries. But experts say that the slow process measured in inches of glacial retreat per year also can lead to a sudden, dramatic tragedy. The melting of glaciers like Peru’s Pastoruri has put cities like Huaraz, located downslope from the glacier about 35 miles (55 kilometers) away, at risk from what scientists call a ‘GLOF’ — Glacial Lake Outburst Flood.”
Click here to read more about the risk of glacial lake outburst floods from GlacierHub’s founder and editor, Ben Orlove.
Yukon has a new lake, thanks to a retreating glacier
From CBC News:
“Yukon has lost a river, and now gained a lake, thanks to the retreating Kaskawulsh glacier.
Geologists and hikers first noticed earlier this summer that the Slims River, which for centuries had delivered melt water from the glacier to Kluane Lake, had disappeared — the glacial run-off was now being sent in a different direction. Now, the level of Kluane Lake has dropped enough to turn the remote Cultus Bay, on the east side of the lake, into Cultus Lake. A narrow channel of water that once connected the bay to the larger lake is gone, exposing a wide gravel bar between the two.”
As a Glacier Retreats a Major Water Source Dries Up
From CBC News:
“It’s [the Kaskawulsh glacier] been the main source of water into Yukon’s Kluane Lake for centuries, but now the Slims River has suddenly slimmed down — to nothing.
‘What folks have noticed this spring is that it’s essentially dried up,’ said Jeff Bond of the Yukon Geological Survey.
‘That’s the first time that’s happened, as far as we know, in the last 350 years.’
What’s happened is some basic glacier hydrology, Bond says — essentially, the Kaskawulsh Glacier has retreated to the point where its melt water is now going in a completely different direction, away from the Slims Valley.”
Rising Temperatures in National Parks Like Glacier Bay
From Climate Central:
“With such a wide variety of climates across the park system, the country’s 59 National Parks all have different challenges to manage in the changing climate. Some parks have experienced dramatic temperature changes, and these shifts can lead to water shortages (or too much water), ocean acidification, and species migration…. Glacier National Park — The number of glaciers has been cut in half since 1968, and the largest glaciers are expected to be gone within the next 15 years.”
Look at temperature trends in national parks here.
Hosted by Greenpeace: Professional Pianist Plays on Glacier
“Through his music, acclaimed Italian composer and pianist Ludovico Einaudi has added his voice to those of eight million people from across the world demanding protection for the Arctic. Einaudi performed one of his own compositions on a floating platform in the middle of the Ocean, against the backdrop of the Wahlenbergbreen glacier (in Svalbard, Norway).”