Melnikov Permafrost Institute

Yakutsk, Russia

Melnikov Permafrost Institute

Yakutsk, Russia
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Liljedahl A.K.,University of Alaska Fairbanks | Boike J.,Alfred Wegener Institute for Polar and Marine Research | Daanen R.P.,354 College Road | Fedorov A.N.,Melnikov Permafrost Institute | And 17 more authors.
Nature Geoscience | Year: 2016

Ice wedges are common features of the subsurface in permafrost regions. They develop by repeated frost cracking and ice vein growth over hundreds to thousands of years. Ice-wedge formation causes the archetypal polygonal patterns seen in tundra across the Arctic landscape. Here we use field and remote sensing observations to document polygon succession due to ice-wedge degradation and trough development in ten Arctic localities over sub-decadal timescales. Initial thaw drains polygon centres and forms disconnected troughs that hold isolated ponds. Continued ice-wedge melting leads to increased trough connectivity and an overall draining of the landscape. We find that melting at the tops of ice wedges over recent decades and subsequent decimetre-scale ground subsidence is a widespread Arctic phenomenon. Although permafrost temperatures have been increasing gradually, we find that ice-wedge degradation is occurring on sub-decadal timescales. Our hydrological model simulations show that advanced ice-wedge degradation can significantly alter the water balance of lowland tundra by reducing inundation and increasing runoff, in particular due to changes in snow distribution as troughs form. We predict that ice-wedge degradation and the hydrological changes associated with the resulting differential ground subsidence will expand and amplify in rapidly warming permafrost regions. © 2016 Macmillan Publishers Limited. All rights reserved.


Lantuit H.,Alfred Wegener Institute for Polar and Marine Research | Overduin P.P.,Alfred Wegener Institute for Polar and Marine Research | Couture N.,Geological Survey of Canada | Wetterich S.,Alfred Wegener Institute for Polar and Marine Research | And 20 more authors.
Estuaries and Coasts | Year: 2012

Arctic permafrost coasts are sensitive to changing climate. The lengthening open water season and the increasing open water area are likely to induce greater erosion and threaten community and industry infrastructure as well as dramatically change nutrient pathways in the near-shore zone. The shallow, mediterranean Arctic Ocean is likely to be strongly affected by changes in currently poorly observed arctic coastal dynamics. We present a geomorphological classification scheme for the arctic coast, with 101,447 km of coastline in 1,315 segments. The average rate of erosion for the arctic coast is 0.5 m year -1 with high local and regional variability. Highest rates are observed in the Laptev, East Siberian, and Beaufort Seas. Strong spatial variability in associated database bluff height, ground carbon and ice content, and coastline movement highlights the need to estimate the relative importance of shifting coastal fluxes to the Arctic Ocean at multiple spatial scales. © 2011 Coastal and Estuarine Research Federation.


Hellmann L.,Swiss Federal Institute of forest | Hellmann L.,Oeschger Center for Climate Change Research | Agafonov L.,Russian Academy of Sciences | Churakova O.,ETH Zurich | And 18 more authors.
Dendrochronologia | Year: 2016

Arctic driftwood represents a unique proxy archive at the interface of marine and terrestrial environments. Combined wood anatomical and dendrochronological analyses have been used to detect the origin of driftwood and may allow past timber floating activities, as well as past sea ice and ocean current dynamics to be reconstructed. However, the success of driftwood provenancing studies depends on the length, number, and quality of circumpolar boreal reference chronologies. Here, we introduce a Eurasian-wide high-latitude network of 286 ring width chronologies from the International Tree Ring Data Bank (ITRDB) and 160 additional sites comprising the three main boreal conifers Pinus, Larix, and Picea. We assess the correlation structure within the network to identify growth patterns in the catchment areas of large Eurasian rivers, the main driftwood deliverers. The occurrence of common growth patterns between and differing patterns within catchments indicates the importance of biogeographic zones for ring width formation and emphasizes the degree of spatial precision when provenancing. Reference chronologies covering millennial timescales are so far restricted to a few larch sites in Central and Eastern Siberia (eastern Taimyr, Yamal Peninsula and north-eastern Yakutia), as well as several pine sites in Scandinavia, where large rivers are missing though. The general good spatial coverage of tree-ring sites across northern Eurasia indicates the need for updating and extending existing chronologies rather than developing new sites. © 2016 Elsevier GmbH.


Semenova O.M.,Saint Petersburg State University | Lebedeva L.S.,Melnikov Permafrost Institute | Nesterova N.V.,Saint Petersburg State University | Vinogradova T.A.,Saint Petersburg State University
IAHS-AISH Proceedings and Reports | Year: 2015

Twelve mountainous basins of the Vitim Plateau (Eastern Siberia, Russia) with areas ranging from 967 to 18 200 km2 affected by extensive fires in 2003 (from 13 to 78 % of burnt area) were delineated based on MODIS Burned Area Product. The studied area is characterized by scarcity of hydrometeorological observations and complex hydrological processes. Combined analysis of monthly series of flow and precipitation was conducted to detect short-term fire impact on hydrological response of the basins. The idea of basin-analogues which have significant correlation of flow with "burnt" watersheds in stationary (pre-fire) period with the assumption that fire impact produced an outlier of established dependence was applied. Available data allowed for qualitative detection of fire-induced changes at two basins from twelve studied. Summer flow at the Amalat and Vitimkan Rivers (22 and 78 % proportion of burnt area in 2003, respectively) increased by 40-50 % following the fire. The impact of fire on flow from the other basins was not detectable. The hydrological model Hydrograph was applied to simulate runoff formation processes for stationary pre-fire and non-stationary post-fire conditions. It was assumed that landscape properties changed after the fire suggest a flow increase. These changes were used to assess the model parameters which allowed for better model performance in the post-fire period. © Author(s) 2015.


Lebedeva L.S.,Melnikov Permafrost Institute | Semenova O.M.,Saint Petersburg State University | Vinogradova T.A.,Saint Petersburg State University | Kruchin M.N.,Training and Consulting Center Izyskatel | Volkova N.V.,State Hydrological Institute
IAHS-AISH Proceedings and Reports | Year: 2015

The probability of heavy rains and river floods is expected to increase with time in the Northern Caucasus region. Densely populated areas in the valleys of small mountainous watersheds already frequently suffer from catastrophic peak floods caused by intense rains at higher elevations. This study aimed at assessing the flood characteristics of several small basins in the piedmont area of the Caucasus Mountains adjacent to the Black Sea coast including ungauged Cemes River in the Novorossiysk city. The Deterministic-Stochastic Modelling System which consists of hydrological model Hydrograph and stochastic weather generator was applied to evaluate extreme rainfall and runoff characteristics of 1 % exceedance probability. Rainfall intensity is shown to play more significant role than its depth in formation of extreme flows within the studied region. © Author(s) 2015.


Tanaka S.,Chiba University | Takeuchi N.,Chiba University | Miyairi M.,Chiba University | Fujisawa Y.,Chiba University | And 10 more authors.
Polar Science | Year: 2016

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 lower bare ice area and Chloromonas sp. in the upper snow area. The total algal bio-volume showed altitudinal variation, ranging from 0.03 to 4.0 mL m-2, and was greatest in the middle of the glaciers. The altitudinal variations in the algal community were similar on all studied glaciers, suggesting that they are typical in this region. Observations over the three years revealed that there was no significant change in the community structure, but a significant change in the total biomass. Since the mean summer air temperature was significantly higher in 2012 when algal biomass was greater, the difference in algal biomass among the years is probably due to the duration of surface melting. The community structure on the studied glaciers is similar to those on glaciers in Arctic and sub-Arctic regions. © 2016 Elsevier B.V. and NIPR.


Paul Overduin P.,Alfred Wegener Institute for Polar and Marine Research | Wetterich S.,Alfred Wegener Institute for Polar and Marine Research | Gunther F.,Alfred Wegener Institute for Polar and Marine Research | Grigoriev M.N.,MelNikov Permafrost Institute | And 4 more authors.
Cryosphere | Year: 2016

Coastal erosion and flooding transform terrestrial landscapes into marine environments. In the Arctic, these processes inundate terrestrial permafrost with seawater and create submarine permafrost. Permafrost begins to warm under marine conditions, which can destabilize the sea floor and may release greenhouse gases. We report on the transition of terrestrial to submarine permafrost at a site where the timing of inundation can be inferred from the rate of coastline retreat. On Muostakh Island in the central Laptev Sea, East Siberia, changes in annual coastline position have been measured for decades and vary highly spatially. We hypothesize that these rates are inversely related to the inclination of the upper surface of submarine ice-bonded permafrost (IBP) based on the consequent duration of inundation with increasing distance from the shoreline. We compared rapidly eroding and stable coastal sections of Muostakh Island and find permafrost-table inclinations, determined using direct current resistivity, of 1 and 5%, respectively. Determinations of submarine IBP depth from a drilling transect in the early 1980s were compared to resistivity profiles from 2011. Based on borehole observations, the thickness of unfrozen sediment overlying the IBP increased from 0 to 14 m below sea level with increasing distance from the shoreline. The geoelectrical profiles showed thickening of the unfrozen sediment overlying ice-bonded permafrost over the 28 years since drilling took place. We use geoelectrical estimates of IBP depth to estimate permafrost degradation rates since inundation. Degradation rates decreased from over 0.4mg-1 following inundation to around 0.1g-1 at the latest after 60 to 110 years and remained constant at this level as the duration of inundation increased to 250 years. We suggest that long-term rates are lower than these values, as the depth to the IBP increases and thermal and porewater solute concentration gradients over depth decrease. For the study region, recent increases in coastal erosion rate and changes in benthic temperature and salinity regimes are expected to affect the depth to submarine permafrost, leading to coastal regions with shallower IBP. © 2016 Author(s).


Severskiy E.V.,Melnikov Permafrost Institute | Olenchenko V.V.,Russian Academy of Sciences | Gorbunov A.P.,Melnikov Permafrost Institute
Earth's Cryosphere | Year: 2014

The results of studies of mountain permafrost of Alpine type by the methods of thermometry and geoelectrical survey are presented. The influence of natural and anthropogenic local factors on the structure of permafrost is demonstrated using the geoelectric models. Such factors include the exposition of the slope, the tectonics, the warming and cooling effects of the foundations of buildings. Changing slope exposure is expressed on geoelectric models by the decreasing of resistivity of high-resistance horizon, the violation of its continuity and the decreasing of its thickness. In the area of faults the discontinuous or island character of high-resistance horizon (permafrost) is observed. During the seismic events the temperature of rocks increases here up to the positive values. According to geophysical data, the formation of taliks occurs in the basis of deformed buildings, in the places of accumulation of snow at snow barriers and under the sites with asphalt covering.


Gorbunov A.P.,Melnikov Permafrost Institute
Earth's Cryosphere | Year: 2013

Analysis of satellite imagery of Google Earth has revealed the active, inactive and fossil rock glaciers, glaciers and areas with permafrost in Iran mountains. The total number of rock glaciers is 355-360, and 70 of them are active. The active and inactive forms occur mainly in the altitudinal range from 4400 to 2700 m. The fossil rock glaciers are sometimes recorded even at the altitude of 2450 m. The length of the largest fossil rock glaciers reaches 5 km. The length of the largest active and inactive rock glaciers ranges within 2.4 and 3.4 km. Small cirque glaciers predominate in the mountains of Iran. The largest debris-covered rock glacier reaches the length of 4 km, whereas their usual length is 200-300 m. The total number of glaciers does not exceed 30. They are confined to 5 mountain massifs. Permafrost is spread at least in the 30 mountain regions.

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