Results 161 to 170 of about 1,495 (203)

The importance of anaerobic oxidation of methane in thermokarst lakes

2023
About 40% of the annual methane emissions originate from natural, non-anthropogenic sources. These include mainly freshwater sediments, in which significant increase in methane emissions has been observed throughout the past decades with the ongoing global temperature rise.
Orit Sivan, André Pellerin, Noam Lotem, Efrat Eilani Russak, Yarden Gerera, Katey Walter-Anthony   +5 more
openaire   +1 more source

Patterns and drivers of anaerobic nitrogen transformations in sediments of thermokarst lakes

Global Change Biology, 2023
AbstractSignificant attention has been given to the way in which the soil nitrogen (N) cycle responds to permafrost thaw in recent years, yet little is known about anaerobic N transformations in thermokarst lakes, which account for more than one‐third of thermokarst landforms across permafrost regions.
Chao Mao, Yutong Song, Yunfeng Peng, Luyao Kang, Ziliang Li, Wei Zhou, Xuning Liu, Futing Liu, Guibing Zhu, Yuanhe Yang   +9 more
openaire   +2 more sources

Stochastic Modelling of Thermokarst Lakes

Thermokarst lakes are widespread and dynamic features of ice-rich permafrost landscapes. They accelerate permafrost thaw, enhance methane production, and alter soil hydrology as well as energy and water exchanges between land and atmosphere. These effects can alter local and global climate.
Constanze Reinken, Victor Brovkin, Philipp de Vrese, Ingmar Nitze, Helena Bergstedt, Guido Grosse   +5 more
openaire   +1 more source

Lakes as geoindicators of thermokarst landscape changes following wildfires

Environmental Monitoring and Assessment
Rapid landscape changes in the Arctic are occurring at an accelerated rate. The most common disturbances that cover the largest areas of the Arctic are wildfires. It is well known that lakes serve as a good proxy for identifying thermokarst processes. However, the impact of fires is often overlooked in analyses of lake dynamics.
Piotr Janiec, Nowosad, Jakub, Zbigniew Zwoliński   +2 more
openaire   +3 more sources

Consistent patterns of the size distribution of thermokarst lakes

Doklady Earth Sciences, 2017
The purpose of this work is to study empirically the patterns of size distribution of thermokarst lakes within lacustrine thermokarst plains. Investigations were performed at 16 sites with various geomorphological, geocryological, and physical geographical conditions (Kolyma Lowland, Western Siberia, Lena River valley, Alaska).
A. S. Viktorov, V. N. Kapralova, T. V. Orlov, O. N. Trapeznikova, M. V. Arkhipova, P. V. Berezin, A. V. Zverev, E. N. Panchenko, S. A. Sadkov   +8 more
openaire   +1 more source

Stochastic modelling of thermokarst lake distributions

Thermokarst lakes are among the most common and dynamic landscape features in ice-rich permafrost regions. They form due to melting of ground ice and subsequent ground subsidence. Their presence and dynamic behavior do not only influence the carbon exchange with the atmosphere by accelerating permafrost thaw and facilitating the production of methane ...
Constanze Reinken, Victor Brovkin, Philipp de Vrese, Ingmar Nitze, Helena Bergstedt   +4 more
openaire   +1 more source

Unravelling methylmercury formation in high-altitude Tibetan thermokarst lakes

Journal of Hazardous Materials
Climate warming accelerates permafrost degradation, which not only increases greenhouse gas emission but also the conversion of permafrost-stored mercury (Hg) to the neurotoxic methylmercury (MeHg) - a global pollutant to humans and ecosystems. While several studies have examined Hg transformation processes in high-latitude Arctic permafrost, little is
Xia Lu, Xiaosha Liu, Zhixia Yang, Liang Li, Man Yang, Yu-Rong Liu, Baohua Gu, Cuicui Mu   +7 more
openaire   +2 more sources

The Evolution of Methane Emissions in Thermokarst Lakes  

Thermokarst lakes, formed by permafrost thaw in the Arctic, are ubiquitous with abrupt permafrost thaw and large atmospheric source "hotspots" of methane (CH4) and carbon dioxide (CO2) emissions, which are expected to double permafrost carbon emissions by the end of the century.
Orit Sivan, Andre Pellerin, Yarden Gerera, Efrat Eilani Russak, Katey Walter Anthony   +4 more
openaire   +1 more source

Observing a Catastrophic Thermokarst Lake Drainage in Northern Alaska

Permafrost and Periglacial Processes, 2015
AbstractThe formation and drainage of thermokarst lakes have reshaped ice‐rich permafrost lowlands in the Arctic throughout the Holocene. North of Teshekpuk Lake, on the Arctic Coastal Plain of northern Alaska, thermokarst lakes presently occupy 22.5% of the landscape, and drained thermokarst lake basins occupy 61.8%.
Benjamin M. Jones, Christopher D. Arp
openaire   +1 more source

Thermokarst lake to lagoon transitions in Eastern Siberia

2020
As the Arctic coast erodes, it drains thermokarst lakes, transforming them into lagoons, and, eventually, integrates them into subsea permafrost. Lagoons represent the first stage of a thermokarst lake transition to a marine setting and possibly more saline and colder upper boundary conditions.
Angelopoulos, Michael (Dr.), Overduin, Pier Paul (Dr.), Westermann, Sebastian, Tronicke, Jens (Prof. Dr.), Strauß, Jens (Dr.), Schirrmeister, Lutz (Dr.), Biskaborn, Boris (Prof.), Liebner, Susanne (Prof. Dr.), Maksimov, Georgii, Grigoriev, Mikhail N., Grosse, Guido (Prof. Dr.)   +10 more
openaire   +1 more source