Results 71 to 80 of about 973,278 (223)

Climate-driven thaw of permafrost preserved glacial landscapes, northwestern Canada [PDF]

Geology, 2017
Abstract Ice-marginal glaciated landscapes demarcate former boundaries of the continental ice sheets. Throughout circumpolar regions, permafrost has preserved relict ground ice and glacigenic sediments, delaying the sequence of postglacial landscape change that transformed temperate environments millennia earlier.
Steven V. Kokelj, Trevor C. Lantz, Jon Tunnicliffe, Rebecca Segal, Denis Lacelle   +4 more
openaire   +1 more source

Effects of Surface Characteristics on the Existence of Isolated Permafrost in Northeastern Mongolia

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Isolated patches of permafrost, where ground thermal changes are affected by ecosystem factors such as vegetation cover rather than climate, may be vulnerable to environmental disturbances in semiarid regions. However, the impacts of ecosystem factors remain underevaluated in Mongolia.
Gansukh Yadamsuren, Jambaljav Yamkhin, Nyambayar Batbayar, Munkhdavaa Munkhjargal, Vandandorj Sumiya, Tsogt‐Erdene Gansukh, Ulambayar Ganbold, Ochirkhuyag Jargalsaikhan, Nandintsetseg Nyam‐Osor, Masayuki Kawahigashi   +9 more
wiley   +1 more source

Modeling the spatiotemporal variability in subsurface thermal regimes across a low-relief polygonal tundra landscape [PDF]

The Cryosphere, 2016
Vast carbon stocks stored in permafrost soils of Arctic tundra are under risk of release to the atmosphere under warming climate scenarios. Ice-wedge polygons in the low-gradient polygonal tundra create a complex mosaic of microtopographic features ...
J. Kumar, N. Collier, G. Bisht, R. T. Mills, P. E. Thornton, C. M. Iversen, V. Romanovsky   +6 more
doaj   +1 more source

Characterizing permafrost active layer dynamics and sensitivity to landscape spatial heterogeneity in Alaska.

The Cryosphere, 2017
An important feature of the Arctic is large spatial heterogeneity in active layer conditions, which is generally poorly represented by global models and can lead to large uncertainties in predicting regional ecosystem responses and climate feedbacks.
Y. Yi, John S. Kimball, Richard H. Chen, M. Moghaddam, R. Reichle, Umakant Mishra, D. Zona, W. Oechel   +7 more
semanticscholar   +1 more source

Permafrost Terrain Disturbance Susceptibility in the Nacho Nyäk Tagé (Stewart River) Watershed, Yukon, Canada

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The Nacho Nyäk Tagé (Stewart River) watershed in central Yukon (Canada) is characterized by discontinuous permafrost that is locally highly sensitive to thaw. This study aims to map the spatial distribution of permafrost terrain disturbances (PTDs) in the watershed and model thaw susceptibility to support community‐led land‐use planning by the
Frederic Brieger, Murray Richardson, Shawn Kenny   +2 more
wiley   +1 more source

Icings and groundwater conditions in permafrost catchments of northwestern Canada

Scientific Reports, 2020
Icings are sheet-like masses of ice that form on the ground surface or in fluvial channels from groundwater seepage. Although the presence of icings in the landscape is known, few studies investigated their regional distribution and explored relations ...
Hugo Crites, Steve V. Kokelj, Denis Lacelle   +2 more
doaj   +1 more source

Hyperspectral species maps and LiDAR‐based structured population models show future forest fire frequency may compromise forest resilience

Remote Sensing in Ecology and Conservation, EarlyView.
Monitoring forest recovery from disturbances at scale requires tracking tree dynamics, yet traditional ground‐based approaches are resource‐intensive. We present a pipeline to parameterize integral projection models (IPMs) using LiDAR data and hyperspectral‐based species maps to assess post‐fire recovery across large, forested areas at the Caribou ...
Jessica McLean, Tommaso Jucker, Alice Rosen, Sean M. McMahon, Roberto Salguero‐Gómez   +4 more
wiley   +1 more source

MULTI-SCALE LANDSCAPE MAPPING OF THE TYUMEN REGION AS A GEOINFORMATION BASE FOR ORGANIZATION OF LANDSCAPE PLANNING, ENVIRONMENTAL MANAGEMENT AND REGIONAL SUSTAINABLE DEVELOPMENT

InterCarto. InterGIS, 2016
Landscape analysis is considered with the following items: 1) a synthetic layer integral physiographic information about the natural environment; 2) an information basis for mapping and evaluation components of landscapes; 3) a basis for the assessment ...
I. R. Idrisov, V. V. Kozin, A. V. Marshinin, D. M. Marinskikh   +3 more
doaj   +1 more source

Retrospective Analysis of Permafrost Landscape Evolution in Yakutia during the Holocene Warm Intervals

Land, 2020
The observed global warming has significant impacts on permafrost. Permafrost changes modify landscapes and cause damage to infrastructure. The main purpose of this study was to estimate permafrost temperatures and active-layer thicknesses during the ...
Alexander N. Fedorov, Varvara A. Novopriezzhaya, Nikolay A. Fedorov, Pavel Y. Konstantinov, Vera V. Samsonova   +4 more
doaj   +1 more source

PeRL: a circum-Arctic Permafrost Region Pond and Lake database [PDF]

Earth System Science Data, 2017
Ponds and lakes are abundant in Arctic permafrost lowlands. They play an important role in Arctic wetland ecosystems by regulating carbon, water, and energy fluxes and providing freshwater habitats. However, ponds, i.e., waterbodies with surface areas
S. Muster, K. Roth, M. Langer, S. Lange, F. Cresto Aleina, A. Bartsch, A. Morgenstern, G. Grosse, B. Jones, A. B. K. Sannel, Y. Sjöberg, F. Günther, C. Andresen, A. Veremeeva, P. R. Lindgren, F. Bouchard, F. Bouchard, M. J. Lara, D. Fortier, S. Charbonneau, T. A. Virtanen, G. Hugelius, J. Palmtag, M. B. Siewert, W. J. Riley, C. D. Koven, J. Boike   +26 more
doaj   +1 more source