Results 41 to 50 of about 244 (114)

Deep Convolutional Neural Networks for Automated Characterization of Arctic Ice-Wedge Polygons in Very High Spatial Resolution Aerial Imagery

Remote Sensing, 2018
The microtopography associated with ice-wedge polygons governs many aspects of Arctic ecosystem, permafrost, and hydrologic dynamics from local to regional scales owing to the linkages between microtopography and the flow and storage of water, vegetation
Weixing Zhang, Chandi Witharana, Anna K. Liljedahl, Mikhail Kanevskiy   +3 more
doaj   +1 more source

The Predictive Skill of a Remote Sensing-Based Machine Learning Model for Ice Wedge and Visible Ground Ice Identification in Western Arctic Canada

Remote Sensing
Fine-scale maps of ground ice and related surface features are critical for permafrost-related modelling and management. However, such maps are lacking across almost the entire Arctic.
Qianyu Chang, Simon Zwieback, Aaron A. Berg   +2 more
doaj   +1 more source

Effects of ice-wedge degradation and warming on Arctic tundra vegetation across a climatic gradient using a nitrogen-based model

Arctic, Antarctic, and Alpine Research
Ice-wedge polygons in Arctic tundra landscapes influence hydrology, nutrients, thermal regimes, and vegetation. Ice-wedges are particularly vulnerable to warming events, and widespread degradation has been observed in recent decades.
Kelcy Kent, Howard E. Epstein, Lindsay Grose, Mark Torre Jorgenson, Anna Liljedahl   +4 more
doaj   +1 more source

Regional Patterns and Asynchronous Onset of Ice-Wedge Degradation since the Mid-20th Century in Arctic Alaska

Remote Sensing, 2018
Ice-wedge polygons are widespread and conspicuous surficial expressions of ground-ice in permafrost landscapes. Thawing of ice wedges triggers differential ground subsidence, local ponding, and persistent changes to vegetation and hydrologic connectivity
Gerald V. Frost, Tracy Christopherson, M. Torre Jorgenson, Anna K. Liljedahl, Matthew J. Macander, Donald A. Walker, Aaron F. Wells   +6 more
doaj   +1 more source

High potential for loss of permafrost landforms in a changing climate

Environmental Research Letters, 2020
The presence of ground ice in Arctic soils exerts a major effect on permafrost hydrology and ecology, and factors prominently into geomorphic landform development.
Olli Karjalainen, Miska Luoto, Juha Aalto, Bernd Etzelmüller, Guido Grosse, Benjamin M Jones, Karianne S Lilleøren, Jan Hjort   +7 more
doaj   +1 more source

New ground ice maps for Canada using a paleogeographic modelling approach [PDF]

The Cryosphere, 2019
Ground ice melt caused by climate-induced permafrost degradation may trigger significant ecological change, damage infrastructure, and alter biogeochemical cycles. The fundamental ground ice mapping for Canada is now >20 years old and does not include
H. B. O'Neill, S. A. Wolfe, C. Duchesne
doaj   +1 more source

Hydrochemistry of hillslope permafrost catchments with degrading and stable ice-wedge polygons, Ogilvie Mountains, Yukon, Canada

Arctic Science
Ice-wedge polygonal terrain is one of the most widespread landscapes in continuous permafrost, and at many locations, is undergoing substantial degradation.
Emmanuel Carrière, Roxanne Frappier, Jean Bjornson, Denis Lacelle   +3 more
doaj   +1 more source

Creep Buckling of a Wedge-Shaped Floating Ice Plate

Engineering Transactions, 2004
The paper is concerned with the problem of creep buckling of a floating ice plate pressing against a rigid, vertical-walled, engineering structure of a finite length.
R. Staroszczyk, B. Hedzielski
doaj   +1 more source

Formation of Low-Centered Ice-Wedge Polygons and Their Orthogonal Systems: A Review

Geosciences
Ice wedges, which are ubiquitous in permafrost areas, play a significant role in the evolution of permafrost landscapes, influencing the topography and hydrology of these regions. In this paper, we combine a detailed multi-generational, interdisciplinary,
Yuri Shur, Benjamin M. Jones, M. Torre Jorgenson, Mikhail Z. Kanevskiy, Anna Liljedahl, Donald A. Walker, Melissa K. Ward Jones, Daniel Fortier, Alexander Vasiliev   +8 more
doaj   +1 more source

Tapped lakes as sediment traps in an Arctic delta [PDF]

Proceedings of the International Association of Hydrological Sciences, 2015
Lakes within the Colville River delta in northern Alaska, USA, vary in size from small ponds created by ice-wedge growth to thaw lakes that are as much as three kilometres long and ten metres deep.
J. Walker, M. McGraw
doaj   +1 more source