Methane Content and Emission in the Typical Tundra and the Southern Tundra of the Western Russian Arctic     

Vasiliev  A. A.  Melnikov  V. P.  Zadorozhnaia  N. A.  Oblogov  G. E.  Streletskaya  I. D.  Savvichev  A. S. 《Doklady Earth Sciences》2022,505(1):506-511

Doklady Earth Sciences - The results of studying the emission, content, and isotopic composition of methane in soils of the active layer in the zones of typical and southern shrubby tundra of the...  相似文献   

Origin of V. Grib pipe eclogites (Arkhangelsk region,NW Russia): geochemistry,Sm-Nd and Rb-Sr isotopes and relation to regional Precambrian tectonics     

Shchukina  Elena V.  Agashev  Aleksey M.  Soloshenko  Natalia G.  Streletskaya  Mariya V.  Zedgenizov  Dmitry A. 《Mineralogy and Petrology》2019,113(5):593-612

Mineralogy and Petrology - In this paper, new main and trace elements and isotopic data are presented for 14 coarse-grained eclogite xenoliths from the V. Grib kimberlite pipe in the central part...  相似文献   

Methane Concentration and Emission in Dominant Landscapes of Typical Tundra of Western Yamal     

Vasiliev  A. A.  Melnikov  V. P.  Semenov  P. B.  Oblogov  G. E.  Streletskaya  I. D. 《Doklady Earth Sciences》2019,485(1):284-287

Doklady Earth Sciences - Methane concentration in dominant landscapes of typical tundra of Western Yamal has been measured. The highest methane content in the active layer was measured in tundra...  相似文献   

Permafrost aggradation and methane production in low accumulative laidas (tidal flats) of the Kara Sea     

Vasiliev  A. A.  Melnikov  V. P.  Streletskaya  I. D.  Oblogov  G. E. 《Doklady Earth Sciences》2017,476(1):1069-1072

Doklady Earth Sciences - It was established that along with permafrost degradation, the processes of permafrost aggradation occur in the modern low accumulative surfaces of Kara Sea. The cycle of...  相似文献   

The Arctic Coastal Dynamics Database: A New Classification Scheme and Statistics on Arctic Permafrost Coastlines     

Hugues Lantuit  Pier Paul Overduin  Nicole Couture  Sebastian Wetterich  Felix Aré  David Atkinson  Jerry Brown  Georgy Cherkashov  Dmitry Drozdov  Donald Lawrence Forbes  Allison Graves-Gaylord  Mikhail Grigoriev  Hans-Wolfgang Hubberten  James Jordan  Torre Jorgenson  Rune Strand ?deg?rd  Stanislav Ogorodov  Wayne H. Pollard  Volker Rachold  Sergey Sedenko  Steve Solomon  Frits Steenhuisen  Irina Streletskaya  Alexander Vasiliev 《Estuaries and Coasts》2012,35(2):383-400

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.  相似文献   

Estimation of atmospheric paleo-circulation based on isotope composition of ice wedges     

I. D. Streletskaya  A. A. Vasiliev  V. P. Melnikov  G. E. Oblogov 《Doklady Earth Sciences》2014,457(2):1025-1027

Cryostratigraphy of frozen late-Pleistocene sediments was studied in natural exposures at the Arctic coastal area. The isotope composition of ice wedges was determined. The data base on isotope composition of syngenetic ice wedges and modern elementary ice veins was compiled for the Eurasian Arctic based on obtained data and available literature sources. Spatial distribution of the isotope composition of ice wedges, which indicates paleo-climatic conditions, was determined separately for Marine Isotope Stages (MISs) from MIS 1 to MIS 4 for the Eurasian Arctic. The pattern of this distribution has remained stable during the last 50 000 years, which indicates a stable trend in atmospheric circulation from 50 000 yr BP to the present.  相似文献   

Methane in ground ice and frozen Quaternary deposits of Western Yamal     

A. A. Vasiliev  I. D. Streletskaya  V. P. Melnikov  G. E. Oblogov 《Doklady Earth Sciences》2015,465(2):1289-1292

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New data on genesis of the crust in the eastern segment of the Middle Urals: Sr–Nd isotopic constraints     

V. N. Smirnov  Yu. L. Ronkin  V. N. Puchkov  N. G. Soloshenko  M. V. Streletskaya 《Doklady Earth Sciences》2016,467(2):331-336

The analysis of the Sr and Nd isotopic composition in different granitoids of the Verkhisetsk, Shartash, Krasnopolsk, Petrokamensk, and Shabry massifs, which were successively formed in the island arc, continental marginal, and collisional geodynamic settings during the period from the Middle Devonian to the early Permian, revealed that ⁸⁷Sr/⁸⁶Sr₀ values in them vary from 0.70331 to 0.70431 and ε_Nd(t), from +1.9 to +6.2. The two-stage model Nd age of granitoids (938–629 Ma) indicates that their magma originates from material at least Neoproterozoic in age, not younger. The observed variations in the Nd model ages of granitoids and ⁸⁷Sr/⁸⁶Sr₀ values provide grounds for assuming the primary heterogeneity of the source of granitoid melts.  相似文献