Finding out which is the highest mountain in the US Arctic may be the last thing on your mind, unless you are an explorer who skis from the tallest peaks around the globe. Ski mountaineer Kit DesLauriers joined forces with glaciologist Matt Nolan to settle a debate of more than 50 years, while testing a new, affordable mapping technique in a steep mountainous region. Their research is published today (23 June) in The Cryosphere, an open access journal of the European Geosciences Union (EGU).
At 6190m, Denali is the uncontested highest peak in North America, but beyond the Arctic Circle, a debate remains as to which US mountain can be crowned the tallest. Depending on the scale of the map you look at, the 1950s US Geological Survey’s topographic maps of the eastern Alaska Arctic show either Mt Chamberlin or Mt Isto as the highest mountain in the region.
3D visualisation of Mt Isto based on fodar data
Nolan & DesLauriers, The Cryosphere, 2016/Fairbanks Fodar
“These mountain peaks just happened to be located in the same area as the glaciers we were studying and several of the peaks ended up in our maps,” says Nolan, a professor at the University of Alaska Fairbanks and the lead-author of the study. He had been mapping glacier volume change in the Brooks Range using a technique called fodar, which he invented. “Because we were interested in understanding the performance limitations of fodar in steep mountain terrain, it seemed a natural fit to combine this validation testing with settling the debate on which peak was the tallest.”
Fodar is used to survey and map terrain using airborne photography. It’s similar to airborne lidar, which relies on laser equipment mounted on an aircraft to scan the landscape and create 3D maps of the terrain, but is much more affordable. “The core equipment is a modern, professional DSLR camera, a high-quality lens, a survey-grade GPS unit, and some custom electronics to link the camera to the GPS,” Nolan explains.
“A modern airborne lidar unit that can map steep mountain terrain like the one we studied costs over 500,000 USD and typically requires a twin engine plane and a separate equipment operator. In contrast, the fodar hardware costs under 30,000 USD if bought new (much cheaper if you buy used) and can be operated by the pilot flying in a small single-engine plane.”
Taking to the skies, Nolan flew his Cessna 170B to map the Brooks Range peaks. Meanwhile, DesLauriers, a professional athlete and the first person to ski down the highest peaks of the 7 continents, was on the ground climbing up and then skiing down Mt Isto and Mt Chamberlin. During the trek, she tracked her position using the same type of GPS unit Nolan used in his plane.
“The GPS antenna, mounted to a steel post in my backpack, required a constant unobstructed view of the sky which forced me to find creative ways to adapt my usual ski carrying system while climbing,” DesLauriers says. “Instead of a normal rest stop to eat and hydrate, I used the rare moments standing still to note my location and time in a field journal so that Matt could have as much data as possible to compare our measurements. The process made climbing the peaks, which took on average a 10 hr summit push after a multi-day approach, more difficult but also more rewarding.”
Nolan explains why this challenging expedition was needed: “The general idea is to measure elevations from the air at about the same time someone is measuring them on the ground. These ground control points then get compared to the airborne measurements and the difference between them is a measure of accuracy.”
With an accuracy of better than 20cm, Nolan and DesLauriers found that Mt Isto is, at 2735.6m, the tallest peak in the US Arctic while Mt Chamberlin (2712.3m) is only the third highest peak. Fodar measurements also showed a third peak, Mt Hubley, surpasses Mt Chamberlin by about 5m, taking up second place in the list of highest US Arctic mountains. Nolan and DesLauriers believe it is plausible that the ranking has changed over time, and may continue to change as summit glaciers dwindle, though not enough to remove Mt Isto from the top.
Fodar has helped settled this debate, but the applications of the technique extend far beyond measuring mountain heights. “Though determining peak heights was a fun and useful study, our primary use for fodar is in change detection in the cryosphere [the planet’s frozen regions].” In addition to measuring peak heights, they are using the same maps to study how snow and glacier melt will affect the region.
Nolan has also used fodar to measure coastal erosion, permafrost melt, landslides, ice jams, and infrastructure degradation, mostly in Alaska. Elsewhere, he has been discussing fodar projects to study landscape and ecological change in the Galapagos, flooding dynamics in desert regions of Botswana, and even earthquake relief in Nepal. “The possibilities are truly unlimited.”
# # #
Please mention the name of the publication (The Cryosphere) if reporting on this story and, if reporting online, include a link to the paper (TBA) or to the journal website (http://www.the-cryosphere.net).
The expedition to climb and map Mt Chamberlin and Mt Isto was sponsored, in part, by a grant from the National Geographic Society and the National Science Foundation. More information about the fodar technique and visualisations of the mountains peaks is available at http://fairbanksfodar.com/fodar-updates-usgs-maps.
The research is presented in the paper ‘Which are the highest peaks in the US Arctic? Fodar settles the debate’ to appear in the EGU open access journal The Cryosphere on 23 June 2016.
The scientific article is available online, free of charge, from the publication date onwards, at http://www.the-cryosphere-discuss.net/tc-2015-214/ (this URL currently links to the non-peer-reviewed version of the paper, but will redirect to the final paper page after the article is published).
*A pre-print version of the final paper is available for download at http://www.egu.eu/news/241/new-technique-settles-old-debate-on-highest-peaks-in-....*
The team is composed of Matt Nolan (Institute of Northern Engineering, University of Alaska Fairbanks, US) and Kit DesLauriers (The North Face, Teton Village, Wyoming, US).
The European Geosciences Union (EGU, http://www.egu.eu/) is Europe’s premier geosciences union, dedicated to the pursuit of excellence in the Earth, planetary, and space sciences for the benefit of humanity, worldwide. It is a non-profit interdisciplinary learned association of scientists founded in 2002. The EGU has a current portfolio of 17 diverse scientific journals, which use an innovative open access format, and organises a number of topical meetings, and education and outreach activities. Its annual General Assembly is the largest and most prominent European geosciences event, attracting over 11,000 scientists from all over the world. The meeting’s sessions cover a wide range of topics, including volcanology, planetary exploration, the Earth’s internal structure and atmosphere, climate, energy, and resources. The EGU 2017 General Assembly is taking place in Vienna, Austria, from 23 to 28 April 2017. For information about meeting, press registration, and live-streamed sessions, please check http://media.egu.eu, or follow the EGU on Twitter (http://twitter.com/EuroGeosciences) and Facebook (http://www.facebook.com/EuropeanGeosciencesUnion).
The Cryosphere (TC, http://www.the-cryosphere.net/) is an international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are ice sheets and glaciers, planetary ice bodies, permafrost, river and lake ice, seasonal snow cover, sea ice, remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.
Glaciologist at University of Alaska Fairbanks
Fairbanks, Alaska, US
The North Face’s Professional Athlete team
Teton Village, Wyoming, US
EGU Media and Communications Manager
EGU on Twitter: @EuroGeosciences
http://www.the-cryosphere.net – The Cryosphere (journal)
http://www.egu.eu/news/241/new-technique-settles-old-debate-on-highest-peaks-in-... – Press release on the EGU website, including scientific study and images
Dr. Bárbara Ferreira | European Geosciences Union
Greenland ice flow likely to speed up: New data assert glaciers move over sediment, which gets more slippery as it gets wetter
17.08.2017 | Swansea University
Climate change: In their old age, trees still accumulate large quantities of carbon
17.08.2017 | Universität Hamburg
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
18.08.2017 | Life Sciences
18.08.2017 | Physics and Astronomy
18.08.2017 | Materials Sciences