Results 51 to 60 of about 25,716 (256)

Vegetation on the move: elevational shifts and greening dynamics across the Himalayan alpine zone

Ecography, EarlyView.
This study investigates alpine ‘vegetation line' (the upper limit of continuous plant community) dynamics in the Himalayan alpine zone (HAZ) over a 24‐year timescale (1999–2022) using maximum NDVI products derived from Landsat series datasets, adjusted for sampling bias using phenological modelling.
Ruolin Leng, Stephan Harrison, Dominic Fawcett, Achyut Tiwari, Mike Harrison, Karen Anderson   +5 more
wiley   +1 more source

Does Palsa Thaw in Northern Finland Contribute to Remobilisation of Metals Accumulated in Peat Into Surface Waters?

Land Degradation &Development, EarlyView.
ABSTRACT Permafrost is rapidly degrading in the sporadic zone, including palsa mires in Scandinavia. Peatlands in the area have likely accumulated heavy metals from atmospheric deposition of industrial contaminants in the wider region. As the palsa mire chemical composition is not well known, and in other permafrost regions the permafrost thaw may ...
Joanna Katarzyna Jóźwik, Krystyna Kozioł, Marcin Frankowski, Marta Jakubiak, Kamil Nowiński, Mariusz Jędrysek, Danuta Szumińska, Żaneta Polkowska   +7 more
wiley   +1 more source

ESTIMATION OF SEISMIC IMPACTS UNDER CONDITIONS OF PERMAFROST DEGRADATION

Bulletin of Kamchatka Regional Association «Educational-Scientific Center». Earth Sciences, 2022
Permafrost is widespread in Russia in many mining and oil regions. Some of these areas are located in zones of high seismic activity. In connection with global climate change and possible degradation of permafrost, it is necessary to study the seismic properties of frozen and thawed soils in northern regions, as well as the processes affecting their ...
Trifonov B.A., Milanovsky S.Yu., Nesynov V.V.   +2 more
openaire   +2 more sources

Evaluation of the Algorithms and Parameterizations for Ground Thawing and Freezing Simulation in Permafrost Regions [PDF]

, 2008
Ground thawing and freezing depths (GTFDs) strongly influence the hydrology and energy balances of permafrost regions. Current methods to simulate GTFD differ in algorithm type, soil parameterization, representation of latent heat, and unfrozen water ...
Abbey, Alexeev, Alexiades, Andersland, Anderson, Anisimov, Becker, Boike, Burn, Carey, Carey, Carey, Carey, Carlson, Cary, Cherkauer, Coll, Dai, de Vries, Delisle, Farouki, Foley, Fox, Fuchs, Goodrich, Goodrich, Goodrich, Gu, Hayashi, Hinkel, Hinkel, Hinzman, Johansen, Jumikis, Kade, Kane, Kersten, Klene, Koopmans, Koren, Lachenbruch, Lawrence, Li, Ling, Lunardini, Luo, McCauley, McNamara, Metcalfe, Nakano, Nelson, Nelson, Nicolsky, Niu, Osterkamp, Osterkamp, Outcalt, Overduin, Pitman, Quinton, Quinton, Riseborough, Romanovsky, Romanovsky, Romanovsky, Sean K. Carey, Shoop, Slater, Smerdon, Smirnova, Stefan, Stevens, Sushama, Sushama, Tarnawski, Tarnawski, Torrance, Van Wijk, Verseghy, William L. Quinton, Williams, Woo, Woo, Woo, Yalamanchili, Yi, Yinsuo Zhang, Zhang, Zhang, Zhang, Zhang, Zhao   +91 more
core   +2 more sources

Experimental Investigation of Moisture Movement During Freeze–Thaw Cycles and Its Effect on Physical Rock Weathering in Low‐Porosity Alpine Limestone

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The progressive weakening of alpine rockwalls through subcritical cracking, driven by repeated low‐magnitude stress processes, plays a key role in alpine rock weathering. Laboratory studies using acoustic emission (AE) monitoring have shown that thermal stresses from freeze–thaw cycling induce crack propagation, with recent work highlighting ...
Andrew Mitchell, Oliver Sass
wiley   +1 more source

Sensitivity of the impact of aeolian sand cover on permafrost degradation in the Qinghai–Xizang Plateau

Environmental Research Letters
Environmental transformations and intensifying desertification across the Qinghai–Xizang Plateau (QXP) are having a significant influence permafrost degradation, heightening the risks associated with carbon emissions, thermal hazards and infrastructural ...
Luyang Wang, Ziteng Fu, Guanli Jiang, Wenyan Du, Xinyu Men, Dongliang Luo, Qingbai Wu   +6 more
doaj   +1 more source

Impact of Groundwater Flow on Permafrost Degradation and Transportation Infrastructure Stability [PDF]

, 2013
INE/AUTC 13 ...
Daanen, Ronald P., Darrow, Margaret M., de Grandpre, Isabelle, Fortier, Daniel, Sliger, Michel, Veuille, Sabin, Zottola, Jason T.   +6 more
core  

Shrub expansion in tundra ecosystems: dynamics, impacts and research priorities [PDF]

, 2011
Part of Focus on Dynamics of Arctic and Sub-Arctic Vegetation Recent research using repeat photography, long-term ecological monitoring and dendrochronology has documented shrub expansion in arctic, high-latitude and alpine tundra ecosystems. Here, we (1)
Andreu-Hayles, Laia, Blok, Daan, Boudreau, Stephane, Collier, Laura Siegwart, Elmendorf, Sarah, Epstein, Howard E., Forbes, Bruce C., Goetz, Scott, Grogan, Paul, Hallinger, Martin, Hermanutz, Luise, Hik, David S., Lantz, Trevor, Levesque, Esther, Macias-Fauria, Marc, Menard, Cecile B, Myers-Smith, Isla, Ravolainen, Virve, Rayback, Shelly A, Rixen, Christian, Ropars, Pascale, Rozema, Jelte, Sass-Klaassen, Ute, Schaepman-Strub, Gabriela, Schmidt, Niels Martin, Tape, Ken D, Trant, Andrew, Venn, Susanna, Weijers, Niels Martin, Welker, Jeffrey, Wilmking, Martin, Wipf, Sonja   +31 more
core   +3 more sources

Spatial Variability of Permafrost and Active Layer Thickness in a Forested Hillslope of the Taiga Shield

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Under continued climate warming, understanding present‐day permafrost distribution and the controls on ground thaw are critical for predicting permafrost thaw trajectories and associated implications. This study presents a high‐resolution investigation of permafrost extent and active layer thickness (ALT) across a coniferous forested hillslope
Alana Muenchrath, Christopher Spence, Andrew Ireson   +2 more
wiley   +1 more source

FOUR YEARS OF UNMANNED AERIAL SYSTEM IMAGERY REVEALS VEGETATION CHANGE IN A SUB-ARCTIC MIRE DUE TO PERMAFROST THAW [PDF]

, 2018
Warming trends in sub-arctic regions have resulted in thawing of permafrost which in turn induces change in vegetation across peatlands both in areal extent and composition. Collapse of palsas (i.e.
DelGreco, Jessica
core   +1 more source