Results 221 to 230 of about 25,716 (256)

Emergent biogeochemical risks from Arctic permafrost degradation

Nature Climate Change, 2021
The Arctic cryosphere is collapsing, posing overlapping environmental risks. In particular, thawing permafrost threatens to release biological, chemical and radioactive materials that have been sequestered for tens to hundreds of thousands of years. As these constituents re-enter the environment, they have the potential to disrupt ecosystem function ...
Kimberley R. Miner, Juliana D’Andrilli, Rachel Mackelprang, Arwyn Edwards, Michael J. Malaska, Mark P. Waldrop, Charles E. Miller   +6 more
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Thaw Responses in Degrading Permafrost

Volume 1: Project Management; Design and Construction; Environmental Issues; GIS/Database Development; Innovative Projects and Emerging Issues; Operations and Maintenance; Pipelining in Northern Environments; Standards and Regulations, 2006
The Norman Wells pipeline has operated for over 20 years, transporting crude oil from Norman Wells, Northwest Territories to Zama, Alberta. The pipeline route traverses 869 km of discontinuous permafrost. The stability of the slopes along the route required that rapid thawing of ice-rich permafrost be avoided, lest the high porewater pressures that ...
Jim Oswell, Darren Skibinsky
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Highway embankments on degrading and degraded permafrost

2011
Global warming is affecting transportation systems in northern Canada. Thawing permafrost and expanding infrastructure systems require improved designs, construction and maintenance. The paper provides information about sampling, testing, instrumentation, and numerical modelling on two instrumented sections of provincial roads in Northern Manitoba.
Alfaro M.C., Batenipour H., Graham J., Kurz D.R., Ng T.N.S.   +4 more
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Permafrost Degradation: Legal Consequences

Ecological Law
This article identifies current problems of permafrost degradation in the context of the emergence of a new sphere of legal regulation, primarily in Russia as a subarctic country. Various legal consequences of this phenomenon, especially those arising outside the sea, on land, are very sensitive to ecosystems and humans. It is proposed to begin solving
Olga M. Kozyr, Elena V. Novikova
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Engineering Studies for Degrading Permafrost

Current Practices in Cold Regions Engineering, 2006
Polar mean annual air temperatures have been on the rise for the past few decades and are expected to continue to rise (Hassol, 2004). Because of this, mean annual ground temperatures are rising as well, and civil engineering projects in the circumpolar north are at risk due to the possible thawing of their frozen founding soils.
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Drainage subsidence associated with Arctic permafrost degradation

Journal of Geophysical Research: Earth Surface, 2012
Arctic sources of greenhouse gas associated with permafrost degradation constitute a large uncertainty in existing climate models. Greenhouse gas release from the Arctic subsurface is mediated by numerous interconnected physical processes; one facet of these is the interplay between surface deformation and melting of subsurface ice. First, we construct
K. C. Lewis, G. A. Zyvoloski, B. Travis, C. Wilson, J. Rowland   +4 more
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Hazards related to permafrost and to permafrost degradation

2011
Rockfalls ( 0.1-1 M m3) can threaten valley inhabitants at very long distance from the source area. Permafrost is present in Alpine rockwalls at high elevation (e.g. above c. 3000 m and 3500 m a.s.l. on north- and south-facing slopes, respectively). Its climatically-driven degradation is probably one of the main triggers of recent, present and future ...
Deline P. (1), Chiarle M. (2), Curtaz M. (3), Kellerer-Pirklbauer A. (4), Lieb G.K. (4), Mayr V. (5), Mortara G. (2), Ravanel L. (1)   +7 more
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Co-production of permafrost degradation impact assessment for permafrost environmental utilization and conservation

Impact, 2020
Permafrost plays a hugely significant role in sustaining the global climate for many reasons. As it thaws, gases (usually methane and carbon dioxide) that have lain trapped underneath the ice for millennia are released. These gases then enter the atmosphere and accelerate global warming which leads to more permafrost degradation and it eventually ...
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Permafrost Degradation

2015
Dmitry Streletskiy, Oleg Anisimov, Alexander Vasiliev   +2 more
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Permafrost degradation

2021
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