Results 71 to 80 of about 1,495 (203)

Thermokarst lakes increased atmospheric methane levels [PDF]

Eos, Transactions American Geophysical Union, 2012
Ice cores taken from Greenland indicate that during the last deglaciation, approximately 10,000 years ago, increases in temperature occurred at the same times as increases in atmospheric methane, a potent greenhouse gas. The source of the increase in atmospheric methane is still debated, but it has been suggested that thermokarst lakes, which form from
openaire   +1 more source

Reassessing Alpine Permafrost Thermal State by Accounting for Ground Ice

Earth's Future, Volume 14, Issue 8, August 2026.
Abstract Permafrost thermal state, representing the stored “cold energy” in the ground, is crucial for assessing permafrost changes. However, the conventional metric, mean annual ground temperature (MAGT), has inherent limitations because it overlooks the thermodynamic contribution of ground ice.
Hailong Ji, Zhuotong Nan, Yuhong Chen, Lihua Chen, Shuping Zhao   +4 more
wiley   +1 more source

Reviews and syntheses: Effects of permafrost thaw on Arctic aquatic ecosystems [PDF]

Biogeosciences, 2015
The Arctic is a water-rich region, with freshwater systems covering about 16 % of the northern permafrost landscape. Permafrost thaw creates new freshwater ecosystems, while at the same time modifying the existing lakes, streams, and rivers that are ...
J. E. Vonk, S. E. Tank, W. B. Bowden, I. Laurion, W. F. Vincent, P. Alekseychik, M. Amyot, M. F. Billet, J. Canário, R. M. Cory, B. N. Deshpande, M. Helbig, M. Jammet, J. Karlsson, J. Larouche, G. MacMillan, M. Rautio, K. M. Walter Anthony, K. P. Wickland   +18 more
doaj   +1 more source

Selenium speciation dynamics in the Baltic and North Seas: Competing influences of marine and terrestrial inputs, biological activity, and redox conditions

Limnology and Oceanography, Volume 71, Issue 7, July 2026.
Abstract Despite the importance of coastal areas for the transfer of selenium (Se) from rivers to the open ocean and its bioavailability to food webs, dissolved Se concentrations and speciation in these ecosystems remain poorly understood. We conducted a 3‐yr study with monthly water column sampling at five stations spanning from the North Sea to the ...
Esther S. Breuninger, Elyssa Beyrouti, Julie Tolu, Zoé Le Bras, Sylvain Bouchet, Lenny H.E. Winkel   +5 more
wiley   +1 more source

Capturing the Multi‐Decadal Evolution of Glacier–Permafrost Interactions in a High‐Alpine Environment (Ritord, Western Swiss Alps)

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 473-497, July/September 2026.
ABSTRACT This study investigates the multi‐decadal evolution of a glacier forefield under permafrost conditions in the Combins Massif (western Swiss Alps). A multi‐method approach based on historical and recent datasets is used to analyze its landform components.
Julie Wee, Hanne Hendrickx, Sebastián Vivero   +2 more
wiley   +1 more source

Elevation‐Dependent Permafrost Thaw on the Tibetan Plateau Delays Seasonal Discharge and Poses a Risk of Reduction in Downstream Water Availability

Earth's Future, Volume 14, Issue 7, July 2026.
Abstract Global warming and permafrost thaw have significantly altered landscapes and hydrological conditions in permafrost regions. While site‐specific process studies have described hydrological changes during thawing, basin‐scale impact assessments and streamflow modeling remain challenging due to landscape heterogeneity and complex interactions ...
Chengwei Wan, John J. Gibson, Peng Yi, Xicai Pan, Chenghao Chen, Grzegorz Skrzypek   +5 more
wiley   +1 more source

Present-day permafrost carbon feedback from thermokarst lakes [PDF]

, 2016
Rapid temperature rise during recent decades (IPCC 2013) is causing permafrost in the Arctic to warm and thaw. This thaw exposes previously frozen soil organic carbon (SOC) to microbial decomposition, generating greenhouse gases methane (CH4) and carbon ...
Daanen, Ronald, Schneider von Deimling, Thomas, Walter Anthony, Katey M., Ping, Chien-Lu, Anthony, Peter, Grosse, Guido, Chanton, Jeffrey P.   +6 more
core   +1 more source

Decadal Shifts Towards Higher Riverine Silicon Relative to Nitrogen and Phosphorus Across High Latitudes

Global Biogeochemical Cycles, Volume 40, Issue 7, July 2026.
Abstract High‐latitude systems are warming faster than the global average, altering the rates of silicon (Si) mobilization from terrestrial to aquatic systems. Dissolved Si (DSi) concentration and its ratio with other nutrients exert strong controls on algae blooms in fresh and marine receiving waters, especially in high‐latitude regions where diatoms ...
Joanna C. Carey, Nicholas J. Lyon, Keira Johnson, Pamela L. Sullivan, Sidney A. Bush, Lienne R. Sethna, Ruth Heindel, Pirkko Kortelainen, Hjalmar Laudon, Diane M. McKnight, Amanda Poste, Antti Raike, Kathi Jo Jankowski   +12 more
wiley   +1 more source

Thermokarst lake waters across the permafrost zones of western Siberia [PDF]

The Cryosphere, 2014
This work describes the hydrochemical composition of thermokarst lake and pond ecosystems, which are observed in various sizes with different degrees of permafrost influence and are located in the northern part of western Siberia within the continuous ...
R. M. Manasypov, O. S. Pokrovsky, S. N. Kirpotin, L. S. Shirokova   +3 more
doaj   +1 more source

Retrogressive Thaw Slump Morphology and Dynamics in Saline Permafrost in Northeast Greenland

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 7, July 2026.
Abstract Saline permafrost occupies a significant portion of permafrost in the Northern Hemisphere and extends several kilometers inland from the present Arctic coastline. However, its thermal conditions, mechanical degradation and geomorphological impacts are poorly understood.
S. Eppinger, T. H. Lorentzen, M. Angelopoulos, T. Ingeman‐Nielsen, D. A. Rudd, M. Marcer, M. Krautblatter   +6 more
wiley   +1 more source