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Publications (43)
Arctic regions are highly impacted by the global temperature rising and its consequences and influences on the thermo-hydro processes and their feedbacks. Theses processes are especially not very well understood in the context of river–permafrost interactions and permafrost degradation. This paper focuses on the thermal characterization of a river–...
Recent evidence has shown that Arctic regions have warmed about twice as much as elsewhere on the planet over the last few decades, and that high-latitude permafrost–periglacial processes and hydrological systems are notably responsive to rising temperatures. The aim of this paper is to report on the thermal regime of islands located along the Lena...
Excess ice that exists in forms such as ice lenses and wedges in permafrost soils is vulnerable to climate warming. Here, we incorporated a simple representation of excess ice in a coupled hydrological and biogeochemical model (CHANGE) to assess how excess ice affects permafrost thaw and associated hydrologic responses, and possible impacts on carb...
The Pan-Eurasian Experiment (PEEX) Science Plan, released in 2015, addressed a need for a holistic system understanding and outlined the most urgent research needs for sustainable development in the Artic-boreal region. Air quality in China and long-range transport of the atmospheric pollutants was also indicated as one of the most crucial topics o...
The purpose of this article was to compile four separate digital thematic maps of temperature and ice content of permafrost, the active layer thickness, and cryogenic processes in Yakutia as a basis for assessing changes to modern climate changes and anthropogenic disturbances. In this work, materials on permafrost were used, serving as the basis f...
The Lena, a large river that drains the northern coldest region of the Northern Hemisphere, is deeply influenced by the continuous permafrost and degradation of the frozen ground has been shown to be the main cause of the marked increase in water discharge. The first objective of this study conducted on the middle Lena was to analyze the island dyn...
Permafrost thaw leads to thermokarst lake formation and talik growth tens of meters deep, enabling microbial decomposition of formerly frozen organic matter (OM). We analyzed two 17‐m‐long thermokarst lake sediment cores taken in Central Yakutia, Russia. One core was from an Alas lake in a Holocene thermokarst basin that underwent multiple lake gen...
Permafrost lies close to the surface of the day, therefore, it is able to quickly respond to modern climatic changes. Under these conditions, the goal of understanding the evolution of permafrost in the near future requires monitoring studies of the current state of permafrost and, first of all, its thermal conditions. In this work, based on the ex...
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 Holocene intervals with significantly warmer-than-present climates—the Atlantic (5500 years BP), Su...
Permafrost ground is one of the largest repositories of terrestrial organic carbon and might become or already is a carbon source in response to ongoing global warming. With this study of syngenetically frozen, ice-rich and organic carbon (OC)-bearing Yedoma and associated alas deposits in central Yakutia (Republic of Sakha), we aimed to assess the...
Abstract. Permafrost ground is one of the largest repositories of stored terrestrial natural carbon and might become a carbon source with ongoing global warming. In particular, syngenetically frozen ice-rich Yedoma deposits originating from the late Pleistocene store a large amount of carbon. This carbon has not yet become part of the recent carbon...
Boreal forests exert a strong influence on the permafrost dynamics protecting the landscapes under climate warming conditions. This paper discusses the influence of various vegetation types on permafrost temperature and active layer thickness, as well as changes in these parameters through successional stages of forest vegetation in Central Yakutia...
Yedoma Ice Complex is a type of permafrost characterized by high ice content and carbon content of approx. 2 wt%. The high ice content makes it very vulnerable to thawing in terms of global warming. Previously stored organic material becomes available for microbial decomposition, releasing carbon into the atmosphere. But Yedoma deposits might be mo...
Characteristics of two drilling cores: Yedoma (22.35 m) and alas (19.80 m)
Parameters:
TC, TN, TOC, d13C, C14, grain size distribution, mass specific magnetic susceptibility, absolute ice content, d18O, d2H, pH, conductivity
Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet to date, no globally consistent assessment of permafrost temperature change has been compiled. Here we use a global data set of permafrost temperature time series from the Global Terrestrial Network for Perma...
The history of permafrost landscape map compilation is related to the study of ecological problems with permafrost. Permafrost-landscape studies are now widely used in geocryological mapping. Permafrost-landscape classifications and mapping are necessary for studying the trends in development of the natural environment in northern and high-altitude...
Mosses strongly affect water and heat fluxes due their high water holding capacity and the provision of insulation. A land surface model (the coupled hydrological and biogeochemical process model, CHANGE) was used to quantitatively assess the influence of moss cover on soil temperature (TSOIL), active layer thickness (ALT), and ecosystem carbon bal...
The thermal imprint of a typical river in the continuous permafrost of Central Yakutia (Siberia, Russia) is studied by active layer thickness measurements along six cross sections, either directly or with geophysical methods. Ground-Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT) measurements provide permafrost depths comparable...
Recent observations indicate that over the last decades, climate change has increasingly influenced the frequency, intensity and duration of extreme climatic and hydrologic events. The main aim of this study is to determine the hydrologic response, especially the flood evolution, of the Lena River in Eastern Siberia to ongoing climate change. Drain...
This paper outlines meteorological and glaciological observations of Glacier No. 31 in the Suntar-Khayata Range, east Siberia, obtained from 2012 to 2014. We set up meteorological instruments and seven stakes on the glacier for the purpose of measuring surface mass balance and flow velocity. The mean air temperature between July 8, 2012 and August...
Active-layer thickness (ALT) is one of the most robust measures used to assess the impact of climate change on terrestrial permafrost. Testing of a handheld dynamic cone penetrometer showed that it was capable of measuring ALT with the same level of accuracy as conventional methods in boreal and tundra sites in eastern Siberia. The penetrometer als...
Snow and ice algal communities were investigated on four glaciers in the Suntar-Khayata Mountain Range in eastern Siberia in Russia over three melting seasons from 2012 to 2014. Two taxa of green algae and five taxa of cyanobacteria were observed on the glaciers. The algal community was dominated by green algae: Ancylonema nordenskioldii in the low...
Permafrost landscape dynamics were investigated between 1998 and 2012 at Neleger, near Yakutsk, in central Yakutia, to determine the effects on permafrost of clear cutting of larch forest. Changes in ground temperature, soil moisture, seasonal thaw depth and surface subsidence at a control (forest) site and a site cleared of forest were associated...
We investigated characteristics of impurities and their impact on the ablation of Glacier No.31 in the Suntar-Khayata Mountain Range in Russian Siberia during summer 2014. Positive degree-day factors (PDDFs) obtained from 20 stake measurements distributed across the glacier's ablation area varied from 3.00 to 8.55 mm w.e. K⁻¹ day⁻¹. The surface ref...
This study quantitatively evaluated how insulation by snow depth (SND) affected the soil thermal regime and permafrost degradation in the pan-Arctic area, and more generally defined the characteristics of soil temperature (TSOIL) and SND from 1901 to 2009. This was achieved through experiments performed with the land surface model CHANGE to assess...
Significant increasing of mean annual air temperatures, freezing index and
thawing index - have exerted a considerable impact on the state of permafrost
landscapes and ecosystems in Eastern Siberia on the last few decades. Many
animals and plants have shifted their ranges and this may be the precursor of
northward shifts of the landscape zones. Lan...
Fluvial thermal erosion following ice breakups of the Lena River (Yakutia, Siberia) is a significant geomorphic process. During the initial stage of ice breakup, ice pushes up onto the river banks and produces large accumulations of ice and sediments that protect the islands’ heads against the mechanical and thermal effects of the river's flow. Thi...
Permafrost degradation and changes in water balance in a thermokarst lake in the middle part of the Lena River basin in eastern Siberia were investigated. We analysed the role of permafrost thawing in the water balance of a growing thermokarst lake. Long-term observations during the last two decades (1992–2008) at our thermokarst monitoring site, Y...
The results of 16 years of seasonal thaw depth observations in permafrost landscapes near Yakutsk have been presented. For the first time in Central Yakutia, the observations at two sites have been carried out following the CALM program protocol on a dense grid of frost/thaw tubes. Measurements have provided new data on the effects of landscape con...
The Lena River is one of the largest Arctic rivers; its periglacial
environment implies an excessive fluvial regime and a spectacular flood
occurring at the end of the winter. From the beginning of November to
May, a continuous ice cover can be observed as thick as 2 m on the Lena
River in Central Siberia. The break up starts around May 15 at the
l...
The application of automated temperature recorders (temperature data loggers) in thermal monitoring of upper permafrost is examined. Based on the results of 10 years of use of temperature data loggers in Yakutia, the recommendations are provided on the choice and preparation of data loggers for monitoring studies, and a description is given for sel...
We discuss the state of permafrost landscapes of Central Yakutia under the influence of current changes of climate and anthropogenic impacts. This study uses the data from the monitoring stations operated by the Permafrost Institute SB RAS, and from the Yakutsk and Pokrovsk meteorological stations. It is found that there is a rather good correlatio...
The paper presents the results of investigations on seasonal thaw depth in the taiga landscapes on the Lena+Kenkeme watershed (in the vicinity of Yakutsk) and the determinant factors. A relationship between seasonal thaw depth and interannual variation of mean annual ground temperature has been obtained. Data on the influence of interannual soil mo...
Thermal and hydrological conditions in the active layer were
investigated at a mature larch forest and an experimental cutover, to
clarify the characteristics of heat and water budget in the active layer
and to assess the influence of clear-cutting on permafrost and active
layer conditions. Clear-cutting enhanced ground thawing and the
difference i...
Landscape changes accompanied by changes in soil properties occur in Central Siberia as a result of forest fire, surface processes and human impact. A non-steady-state technique tested the thermal properties of Siberian soils. Thermal conductivity of thawed soil increases in the active layer at depths of 5 and 30 cm after fire, especially in the or...
The widespread occurrence of alas depressions in Central Yakutia is not necessarily evidence of modern thermokarst activity. Typically, a near-surface ‘shielding layer’, formed as the result of deep thaw in exceptionally warm years, protects underlying icy sediment from thaw. In spite of current climatic warming, there is no noticeable increase in...
Questions
Question (1)
I am not a co-author of the publication "Recent advances on the understanding of the Northern Eurasian environments and of the urban air quality in China - Pan Eurasian Experiment (PEEX) program perspective". The co-author of this publication is Pavel Konstantinov from Lomonosov Moscow State University (Department of Meteorology and Climatology, Ph.D.)
