Results 61 to 70 of about 1,495 (203)

RISK ASSESSMENT BASED ON MATHEMATICAL MORPHOLOGY OF LANDSCAPE MODELS (CASE STUDY OF THERMOKARST PLAINS)

Geography, Environment, Sustainability, 2013
The paper presents a new approach for risk assessment of impact of thermokarst processes on engineering structures; it is based on the methods of mathematical morphology of landscape.
Alexey Victorov, Veronika Kapralova
doaj   +1 more source

Modeled Subsidence of Permafrost Terrain 2025–2050: North‐Central Alaska

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT A large fraction of the Alaska terrain is underlain by regolith that contains excess ice (ice that in volume exceeds the natural pore space). Possible loss of excess ice would lead to ground subsidence, which in turn would disturb and destabilize the ground surface.
Jaakko Putkonen, Hayden Patterson, Robert Chance, Mary Soaper, Anai Caparó Bellido, Aymane Ahajjam, Andrew Wilcox, Sheridan Parker, Timothy Pasch   +8 more
wiley   +1 more source

Internal Structure, Kinematics, and Prehistory of Frozen Debris Lobe‐A (FDL‐A), Brooks Range, Alaska

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Frozen Debris Lobe‐A (FDL‐A)—one of hundreds of FDLs in the Brooks Range of northern Alaska—is a slow‐moving landslide in permafrost that has been the subject of research since 2008 due to its close proximity to the Dalton Highway. Here, we synthesize more than a decade's worth of climate and surface measurements of monitored FDLs, and the ...
Margaret M. Darrow, Esther L. Babcock, Ben A. Leshchinsky   +2 more
wiley   +1 more source

A shift of thermokarst lakes from carbon sources to sinks during the Holocene epoch [PDF]

, 2014
Thermokarst lakes formed across vast regions of Siberia and Alaska during the last deglaciation and are thought to be a net source of atmospheric methane and carbon dioxide during the Holocene epoch1, 2, 3, 4. However, the same thermokarst lakes can also
Finlay, J C, M. C. Mack, Jones, Miriam C., P. M. Anthony, Zimov, S. A., Mack, M. C., Anthony, P. M., Chapin, F Stuart, III, Anthony, K.M. Walter, F. S. Chapin III, Chapin III, F. S., P. Frenzel, Zimov, S A, K. M. Walter Anthony, Frenzel, Peter, Davydov, S, S. Davydov, G. Grosse, Mack, M C, Grosse, G, S. A. Zimov, J. C. Finlay, S. Frolking, Anthony, P M, Grosse, Guido, Frolking, S., Frolking, Steve, Davydov, Sergey, Frenzel, P, Jones, M C, Walter Anthony, K. M., Finlay, J. C., M. C. Jones   +32 more
core   +1 more source

A fully automatic framework for sub-pixel mapping of thermokarst lakes using Sentinel-2 images

Science of Remote Sensing, 2023
Mapping and monitoring thermokarst lakes are crucial to understanding the impact of climate change on permafrost regions and quantifying permafrost-related carbon emissions. Several automatic methods based on remote sensing images have been developed for
Yuanyuan Qin, Chengyuan Zhang, Ping Lu
doaj   +1 more source

Quantifying the Surface Deformation of Pingos on the Alaskan North Slope Using Interferometric Synthetic Aperture Radar (InSAR)

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Pingos are large mounds with cores formed of intrusive ice that form in periglacial landscapes. These ice structures can form in regions of discontinuous permafrost, commonly as hydraulic or open‐system pingos, or in locations of continuous permafrost, commonly as hydrostatic or closed‐system pingos.
Venezia M. Follingstad, Roger J. Michaelides, Matthew R. Siegfried, Tyler M. Meng, John Bradford, Kynan H. G. Hughson, Alexia R. Kubas, Andrew Mullen, Enrica Quartini, Austin Routt, Hanna G. Sizemore, Andrei Swidinsky, Britney E. Schmidt   +12 more
wiley   +1 more source

Constraining bubbling of methane from thermokarst lakes [PDF]

Eos, Transactions American Geophysical Union, 2013
In northern thermokarst lakes, which form in depressions left as permafrost thaws, methane, a greenhouse gas, can be released from lake sediments to the atmosphere through bubbling, or ebullition. Constraining the amount of methane released through bubbling would help scientists understand the role of thawing permafrost in the carbon cycle and global ...
openaire   +1 more source

Palaeoenvironmental and climatic changes from the lateglacial of the Saalian to the Late Weichselian in central Poland: a multiproxy study from Józefów

Boreas, EarlyView.
Józefów site is a case study which provides a detailed record of environmental and climate changes and confirms the main traces of the landscape morphogenesis of the Late Pleistocene established in central‐eastern Europe. This study presents a multiproxy reconstruction of palaeoenvironment under variable climatic conditions from the retreat of the ...
Aleksandra Majecka, Jacek Forysiak, Ryszard Borówka, Andreas Börner, Łukasz Bujak, Leszek Marks, Radosław Mieszkowski, Piotr Moska, Daniel Okupny, Małgorzata Pisarska‐Jamroży, Renata Stachowicz‐Rybka, Krzysztof Stachowicz   +11 more
wiley   +1 more source

Thermokarst Lakes as a Source of Atmospheric CH4 During the Last Deglaciation [PDF]

, 2007
Polar ice-core records suggest that an arctic or boreal source was responsible for more than 30% of the large increase in global atmospheric methane (CH4) concentration during deglacial climate warming; however, specific sources of that CH4 are still ...
Zimov, S.A., Edwards, M.E., Walter, K.M., Grosse, G., Chapin III, F.S.   +4 more
core   +1 more source

Proximate Climate Drivers of Beaver Pond Occupancy and Range Expansion in Arctic Alaska

Global Change Biology Communications, Volume 1, Issue 3, September 2026.
To understand why beavers are colonizing the Arctic, we evaluated which climate drivers underpin beaver pond dynamics. Warm Junes, mild winters, green summers, and wet springs facilitate pond establishment. Rapid improvement in these conditions across recent decades provides mechanistic support that climate change is driving beaver colonization of the ...
Thomas W. Glass, Ken D. Tape, Benjamin M. Jones, V. Sebastian Zavoico   +3 more
wiley   +1 more source