9 research outputs found
Understanding the PermafrostβHydrate System and Associated Methane Releases in the East Siberian Arctic Shelf
This paper summarizes current understanding of the processes that determine the dynamics of the subsea permafrostβhydrate system existing in the largest, shallowest shelf in the Arctic Ocean; the East Siberian Arctic Shelf (ESAS). We review key environmental factors and mechanisms that determine formation, current dynamics, and thermal state of subsea permafrost, mechanisms of its destabilization, and rates of its thawing; a full section of this paper is devoted to this topic. Another important question regards the possible existence of permafrost-related hydrates at shallow ground depth and in the shallow shelf environment. We review the history of and earlier insights about the topic followed by an extensive review of experimental work to establish the physics of shallow Arctic hydrates. We also provide a principal (simplified) scheme explaining the normal and altered dynamics of the permafrostβhydrate system as glacialβinterglacial climate epochs alternate. We also review specific features of methane releases determined by the current state of the subsea-permafrost system and possible future dynamics. This review presents methane results obtained in the ESAS during two periods: 1994β2000 and 2003β2017. A final section is devoted to discussing future work that is required to achieve an improved understanding of the subject
Sonar gas flux estimation by bubble insonification: application to methane bubble flux from seep areas in the outer Laptev Sea
Sonar surveys provide an effective mechanism for mapping seabed methane flux emissions, with Arctic submerged permafrost seepage having great potential to significantly affect climate. We created in situ engineered bubble plumes from 40β―m depth with fluxes spanning 0.019 to 1.1β―Lβ―sβ1 to derive the in situ calibration curve (Q([sigma])). These nonlinear curves related flux (Q) to sonar return ([sigma]) for a multibeam echosounder (MBES) and a single-beam echosounder (SBES) for a range of depths. The analysis demonstrated significant multiple bubble acoustic scattering - precluding the use of a theoretical approach to derive Q([sigma]) from the product of the bubble [sigma] (r) and the bubble size distribution where r is bubble radius. The bubble plume Ο occurrence probability distribution function ([PSI]([sigma])) with respect to Q found [PSI] ([sigma]) for weak Ο well described by a power law that likely correlated with small-bubble dispersion and was strongly depth dependent. [PSI] ([sigma]) for strong Ο was largely depth independent, consistent with bubble plume behavior where large bubbles in a plume remain in a focused core. [PSI] ([sigma]) was bimodal for all but the weakest plumes
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling
Destabilization of intrapermafrost gas hydrate is one possible reason for methane emission on the Arctic shelf. The formation of these intrapermafrost gas hydrates could occur almost simultaneously with the permafrost sediments due to the occurrence of a hydrate stability zone after sea regression and the subsequent deep cooling and freezing of sediments. The top of the gas hydrate stability zone could exist not only at depths of 200β250 m, but also higher due to local pressure increase in gas-saturated horizons during freezing. Formed at a shallow depth, intrapermafrost gas hydrates could later be preserved and transform into a metastable (relict) state. Under the conditions of submarine permafrost degradation, exactly relict hydrates located above the modern gas hydrate stability zone will, first of all, be involved in the decomposition process caused by negative temperature rising, permafrost thawing, and sediment salinity increasing. Thatβs why special experiments were conducted on the interaction of frozen sandy sediments containing relict methane hydrates with salt solutions of different concentrations at negative temperatures to assess the conditions of intrapermafrost gas hydrates dissociation. Experiments showed that the migration of salts into frozen hydrate-containing sediments activates the decomposition of pore gas hydrates and increase the methane emission. These results allowed for an understanding of the mechanism of massive methane release from bottom sediments of the East Siberian Arctic shelf
Signatures of Molecular Unification and Progressive Oxidation Unfold in Dissolved Organic Matter of the Ob-Irtysh River System along Its Path to the Arctic Ocean
The Ob-Irtysh River system is the seventh-longest one in the world. Unlike the other Great Siberian rivers, it is only slightly impacted by the continuous permafrost in its low flow. Instead, it drains the Great Vasyugan mire, which is the world largest swamp, and receives huge load of the Irtysh waters which drain the populated lowlands of the East Siberian Plain. The central challenge of this paper is to understand the processes responsible for molecular transformations of natural organic matter (NOM) in the Ob-Irtysh river system along the South-North transect. For solving this task, the NOM was isolated from the water samples collected along the 3,000?km transect using solid-phase extraction. The NOM samples were further analyzed using high resolution mass spectrometry and optical spectroscopy. The obtained results have shown a distinct trend both in molecular composition and diversity of the NOM along the South-North transect: the largest diversity was observed in the Southern βswamp-wetlandβ stations. The samples were dominated with humic and lignin-like components, and enriched with aminosugars. After the Irtysh confluence, the molecular nature of NOM has changed drastically: it became much more oxidized and enriched with heterocyclic N-containing compounds. These molecular features are very different from the aliphatics-rich permafrost NOM. They witnesses much more conservative nature of the NOM discharged into the Arctic by the Ob-Irtysh river system. In general, drastic reduction in molecular diversity was observed in the northern stations located in the lower Ob flow
Sonar Estimation of Methane Bubble Flux from Thawing Subsea Permafrost: A Case Study from the Laptev Sea Shelf
Seeps found offshore in the East Siberian Arctic Shelf may mark zones of degrading subsea permafrost and related destabilization of gas hydrates. Sonar surveys provide an effective tool for mapping seabed methane fluxes and monitoring subsea Arctic permafrost seepage. The paper presents an overview of existing approaches to sonar estimation of methane bubble flux from the sea floor to the water column and a new method for quantifying CH4 ebullition. In the suggested method, the flux of methane bubbles is estimated from its response to insonification using the backscattering cross section. The method has demonstrated its efficiency in the case study of single- and multi-beam acoustic surveys of a large seep field on the Laptev Sea shelf
Lithological features of surface sediment and their influence on organic m atter distribution across the East-Siberian Arctic shelf
The Arctic is undergoing rapid climate change, which affects the global and regional carbon cycles. The East Siberian Arctic shelf, that is believed to store huge amounts of organic carbon in different pools, has been the subject of growing scientific interest in recent decades. The aim of the work was to study the lithological features of bottom sediments on the East Siberian Arctic shelf and to assess their influence on the spatial distribution of organic material in the study area. Materials and methods. The sediment samples were collected during the 45-day multidisciplinary SWERUS-C3 expedition on IB ODEN in summer 2014. Surface sediments from inner and middle East Siberian Arctic shelf were collected in summer 2008 during the International Siberian Shelf Study (ISSS-08) campaign onboard the HV Yakob Smirnitsky. The samples were analyzed for the grain size and specific surface area characteristics and total organic carbon content. It is shown that the subglacial sedimentation and the accumulation of predominantly fine-grained sediments prevail within the study area. Nevertheless, atypical sand zones were identified on the outer shelf. The authors have suggested several external factors, including modern and paleo ice scouring in the early Holocene, and intensive gas venting, which are accompanied by removal of fine-grained sediments. The paper considers spatial distribution of organic matter in the bottom sediments of the East Siberian Arctic shelf and its interrelation with their lithological properties
Discovery and characterization of submarine groundwater discharge in the Siberian Arctic seas: A case study in Buor-Khaya Gulf, Laptev Sea
It has been suggested that increasing freshwater discharge to the Arctic Ocean may also occur as submarine groundwater discharge (SGD), yet there are no direct observations of this phenomenon in the Arctic shelf seas. This study tests the hypothesis that SGD does exist in the Siberian-Arctic shelf seas but its dynamics may be largely controlled by complicated geocryological conditions such as permafrost. The field-observational approach in the southeast Laptev Sea used a combination of hydrological (temperature, salinity), geological (bottom sediment drilling, geoelectric surveys) and geochemical (224Ra, 223Ra and 222Rn) techniques. Active SGD was documented in the vicinity of the Lena River delta with two different operational modes. In the first system, groundwater discharges through tectonogenic permafrost talik zones was registered in both wintertime and summertime seasons. The second SGD mechanism was cryogenic squeezing out of brine and water-soluble salts detected on the periphery of ice hummocks in the wintertime season. The proposed mechanisms of groundwater transport and discharge in the arctic land-shelf system is elaborated. Through salinity versus 224Ra and 224Ra/223Ra diagrams, the three main SGD-influenced water masses were identified and their end-member composition was constrained. Further studies should apply these techniques to a broader scale with the objective to reach an estimate of the relative importance of the SGD transport vector relative to surface freshwater discharge for both the water balance and aquatic components such as dissolved organic carbon, carbon dioxide, methane, and nutrients
Geochemical characteristics of organic matter in bottom sediments in Ivashkina Lagoon (Bykovsky Peninsula, Laptev Sea)
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ. Π Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ Π΄Π»Ρ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π³Π»ΠΎΠ±Π°Π»ΡΠ½ΡΡ
ΠΊΠ»ΠΈΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΎΡΠΎΠ±ΠΎΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅ ΠΈΠΌΠ΅Π΅Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΈΡΠΎΠ΄Π½ΡΡ
ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠΎΠ² ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π±ΠΈΠΎΠ³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΠΎΡΠΈΡΡΠ΅ΠΌΡ Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΈ Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ². ΠΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π²Π΅ΡΠ΅ΡΡΠ²ΠΎ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ², Π°ΠΊΠΊΡΠΌΡΠ»ΠΈΡΡΡΡΠ΅Π΅ Π³Π΅ΡΠ΅ΡΠΎΠ³Π΅Π½Π½ΡΠ΅ ΡΠΈΠ³Π½Π°Π»Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ° ΠΈ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΡΠ³Π»Π΅ΡΠΎΠ΄Π°, ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠΎΠΌ ΡΠ½ΠΈΠΊΠ°Π»ΡΠ½ΡΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΡΠ΅Π΄ΠΈΠΌΠ΅Π½ΡΠΎΠ³Π΅Π½Π΅Π·Π° ΠΈ Π΄ΠΈΠ°Π³Π΅Π½Π΅Π·Π° ΠΎΡΠ°Π΄ΠΊΠΎΠ². ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ Π½Π°Π±ΠΎΡΠΎΠ² Π²ΡΡΠΎΠΊΠΎΡΠΎΡΠ½ΡΡ
Π³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΠ½ΡΡΡΡΠΌΠ΅Π½ΡΠΎΠ² ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΠΎΠ»ΡΡΠΈΡΡ Π²Π°ΠΆΠ½ΡΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΡ ΠΎ Π²ΠΊΠ»Π°Π΄Π΅ Π°Π»Π»ΠΎΡ
ΡΠΎΠ½Π½ΠΎΠΉ ΠΈ Π°Π²ΡΠΎΡ
ΡΠΎΠ½Π½ΠΎΠΉ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΡ Π² ΡΠΎΡΡΠ°Π² ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° ΠΈ ΡΠ°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ Π²Π½Π΅ΡΡΠΈ Π²ΠΊΠ»Π°Π΄ Π² ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠ΅ ΠΎΡΠ΄Π΅Π»ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠΈΠΊΠ»Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π°. Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠΈ Π»ΠΈΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΠΎΡΠ³Π°Π½ΠΎ-Π³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΎΡΠ»ΠΎΠΆΠ΅Π½ΠΈΠΉ, Π½Π°ΠΊΠΎΠΏΠ»Π΅Π½Π½ΡΡ
Π² ΡΠΏΠ΅ΡΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π»Π°Π³ΡΠ½Π½ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΏΡΠΈΠ±ΡΠ΅ΠΆΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈ ΠΌΠΎΡΡ ΠΠ°ΠΏΡΠ΅Π²ΡΡ
(ΠΠ²Π°ΡΠΊΠΈΠ½Π° Π»Π°Π³ΡΠ½Π°, ΠΡΠΊΠΎΠ²ΡΠΊΠΈΠΉ ΠΏΠΎΠ»ΡΠΎΡΡΡΠΎΠ²). ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠ±ΡΠ΅ΠΊΡΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π±ΡΠ» Π²ΡΠ±ΡΠ°Π½ ΡΠ°Π·ΡΠ΅Π· ΠΎΡΠ°Π΄ΠΊΠΎΠ² Π² ΡΠ°ΠΉΠΎΠ½Π΅ Π΄Π΅Π»ΡΡΡ ΡΠ΅ΠΊΠΈ ΠΠ΅Π½Π°. ΠΠ»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΈΠ·ΠΌΠ΅Π½ΡΠΈΠ²ΠΎΡΡΠΈ ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π½Π°ΠΊΠΎΠΏΠ»Π΅Π½ΠΈΡ ΡΠΎΠ»Ρ ΠΎΡΠ°Π΄ΠΊΠΎΠ² Π±ΡΠ» ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ 18-ΠΌΠ΅ΡΡΠΎΠ²ΡΠΉ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π» ΠΊΠ΅ΡΠ½Π° ΡΠΊΠ²Π°ΠΆΠΈΠ½Ρ VD-13, ΠΏΡΠΎΠ±ΡΡΠ΅Π½Π½ΠΎΠΉ Π² ΡΠ΅Π½ΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈ ΠΠ²Π°ΡΠΊΠΈΠ½ΠΎΠΉ Π»Π°Π³ΡΠ½Ρ Π²ΠΎ Π²ΡΠ΅ΠΌΡ Π²Π΅ΡΠ΅Π½Π½Π΅ΠΉ Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΡΠΏΠ΅Π΄ΠΈΡΠΈΠΈ 2013 Π³. ΠΠ»Ρ ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² Π±ΡΠ»ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΠΈΡ
Π³ΡΠ°Π½ΡΠ»ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΠΏΠΈΡΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ Ρ
ΡΠΎΠΌΠ°ΡΠΎ-ΠΌΠ°ΡΡ-ΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΏΠΎΠ²ΡΡΠ΅Π½Π½ΠΎΠ΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ³Π»Π΅ΡΠΎΠ΄Π° (Π‘ΠΎΡΠ³) Π² ΡΠ°Π·ΡΠ΅Π·Π΅ ΠΏΡΠΈΡΡΠΎΡΠ΅Π½ΠΎ ΠΊ ΠΏΠ΅Π»ΠΈΡΠΎΠ²ΠΎΠΉ ΡΡΠ°ΠΊΡΠΈΠΈ ΠΎΡΠ°Π΄ΠΊΠΎΠ². Π Π°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Π½-Π°Π»ΠΊΠ°Π½ΠΎΠ² Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΠ΅ΡΡΡ Π΄ΠΎΠΌΠΈΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π²ΡΡΠΎΠΊΠΎΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΡΡ
Π½Π΅ΡΠ΅ΡΠ½ΡΡ
Π³ΠΎΠΌΠΎΠ»ΠΎΠ³ΠΎΠ², ΡΡΠΎ ΡΠΊΠ°Π·ΡΠ²Π°Π΅Ρ Π½Π° ΠΏΠΎΠ²ΡΠ΅ΠΌΠ΅ΡΡΠ½ΠΎ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΡΡΠΈΠΉ Π²ΠΊΠ»Π°Π΄ Π²ΡΡΡΠ΅ΠΉ Π½Π°Π·Π΅ΠΌΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ Π² ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π°, Π°ΠΊΠΊΡΠΌΡΠ»ΠΈΡΡΠ΅ΠΌΠΎΠ³ΠΎ Π² ΠΎΡΠ°Π΄ΠΊΠ°Ρ
. Π’Π΅ΠΌ Π½Π΅ ΠΌΠ΅Π½Π΅Π΅, Π²ΠΊΠ»Π°Π΄ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΠΎ ΠΌΠΈΠ³ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΡ Π½Π΅ ΠΈΡΠΊΠ»ΡΡΠ΅Π½, ΡΠ°ΠΊ ΠΊΠ°ΠΊ Π΄Π»Ρ ΡΡΠ΄Π° ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ΠΎΡΠΌΠ΅ΡΠ°Π΅ΡΡΡ ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠ΅ Π½ΠΈΠ·ΠΊΠΎΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΠΎΠΉ ΡΡΠ°ΠΊΡΠΈΠΈ Π½-Π°Π»ΠΊΠ°Π½ΠΎΠ². Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΏΠΈΡΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ΡΠΊΠ°Π·ΡΠ²Π°ΡΡ Π½Π° ΡΠ΅Π·ΠΊΡΡ ΠΈΠ·ΠΌΠ΅Π½ΡΠΈΠ²ΠΎΡΡΡ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ Π‘ΠΎΡΠ³ ΠΈ Π»Π΅ΡΡΡΠΈΡ
ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠΉ Ρ Π³Π»ΡΠ±ΠΈΠ½ΠΎΠΉ.Studying Arctic biogeochemical ecosystem with various methods and approaches is of vital importance to further predict future global climate changes. Organic matter of modern bottom sediments, which accumulates heterogeneous signals of various processes of carbon transport and transformation, acts as the unique indicator of initial depositional environment of sediment and its diagenetic history. Using high-precision geochemical instruments allows us to obtain important information on potential input of both allochthonous and autochthonous components to organic matter, and thus to further promote understanding of the modern Arctic carbon cycle. The aim of the research is to study the lithological and organo-geochemical features of the sediments accumulated in the specific lagoon conditions of the coastal part of the Laptev Sea (Ivashkina Lagoon, Bykovsky Peninsula). Materials and methods. Precipitation in the area of the Lena river delta was selected as an object of the study. To assess the variability of molecular composition of organic matter in accumulation of sediments, the 18--meter interval of the VD-13 well, drilled in the central part of the Ivashkina lagoon during the 2013 spring Arctic expedition, was investigated. For the samples, their granulometric characteristics were determined, and pyrolytic and chromatography-mass spectrometric studies were conducted as well. It is shown that the increased content of organic carbon in the section is confined to the pelitic fraction of sediments. The distribution of n-alkanes is characterized by the dominance of high molecular weight odd homologues, which indicates the ubiquitous contribution of higher terrestrial vegetation to formation of organic matter accumulated in sediments. However, the contribution of the potentially migratory organic component is not excluded, since the presence of a low molecular weight fraction of n-alkanes is noted for a number of samples. The results of the pyrolytic analysis of the samples indicate a sharp variability in the content of Corg and volatile organic compounds with depth
Lithological features and organic matter of sediments in the south-eastern Laptev sea (Muostakh Cape)
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΠ΄ΠΈΠΊΡΠΎΠ²Π°Π½Π° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΊΠ»ΠΈΠΌΠ°ΡΠ°, ΠΊΠΎΡΠΎΡΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΠΊΠ°ΠΊ ΠΏΠΎΡΠ»Π΅Π΄ΡΡΠ²ΠΈΡ ΠΏΠ°ΡΠ½ΠΈΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΡΡΠ΅ΠΊΡΠ°, ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΠΌ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ Π² Π°ΡΠΌΠΎΡΡΠ΅ΡΠ΅ ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΏΠ°ΡΠ½ΠΈΠΊΠΎΠ²ΡΡ
Π³Π°Π·ΠΎΠ² -Π΄Π²ΡΠΎΠΊΠΈΡΠΈ ΡΠ³Π»Π΅ΡΠΎΠ΄Π° ΠΈ ΠΌΠ΅ΡΠ°Π½Π°. ΠΠ»Ρ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΡΠΎΠΉ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ ΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΊΠ»ΠΈΠΌΠ°ΡΠ° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ ΡΡΡΠ°-ΡΠ΅Π»ΡΡ-Π°ΡΠΌΠΎΡΡΠ΅ΡΠ° Π½Π° ΠΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΡΠ΅Π»ΡΡΠ΅, Π²ΠΊΠ»ΡΡΠ°Ρ ΠΎΡΠ΅Π½ΠΊΡ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»Π° ΠΌΠΎΡΠ΅ΠΉ ΠΠΎΡΡΠΎΡΠ½ΠΎΠΉ ΠΡΠΊΡΠΈΠΊΠΈ Π² ΠΊΠΎΠ½ΡΠ΅ΠΊΡΡΠ΅ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ Π»ΠΈΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΈ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π² ΡΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Ρ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π΄ΠΈΠ°Π³Π΅Π½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΠΊΠ°ΡΠ°Π³Π΅Π½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠΉ. Π¦Π΅Π»Ρ: ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ Π»ΠΈΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈ ΠΌΠΈΠ½Π΅ΡΠ°Π»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²ΠΎΠ², ΠΈΠ·ΠΌΠ΅Π½ΡΠΈΠ²ΠΎΡΡΠΈ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° (Π‘ΠΎΡΠ³), ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΠΎΠ³ΠΎ ΠΈ ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° (Ξ΄13C) Π² ΠΎΡΠ»ΠΎΠΆΠ΅Π½ΠΈΡΡ
Π»Π΅Π΄ΠΎΠ²ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΠΏΠΎΠ±Π΅ΡΠ΅ΠΆΡΡ ΠΌΠΎΡΡ ΠΠ°ΠΏΡΠ΅Π²ΡΡ
(ΠΌΡΡ ΠΡΠ°ΡΡΠ°Ρ
). ΠΠ±ΡΠ΅ΠΊΡ: ΠΏΡΠΎΠ±Ρ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ², ΠΎΡΠΎΠ±ΡΠ°Π½Π½ΡΡ
Π² Ρ
ΠΎΠ΄Π΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΡΠΊΡΠΏΠ΅Π΄ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΡΠ°Π±ΠΎΡ 2015 Π³. Π² ΡΠ³ΠΎ-Π²ΠΎΡΡΠΎΡΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈ ΠΌΠΎΡΡ ΠΠ°ΠΏΡΠ΅Π²ΡΡ
. ΠΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ΅Π½ΠΈΠΉ Π²ΠΊΠ»ΡΡΠ°Π΅Ρ Π² ΡΠ΅Π±Ρ ΠΏΡΠΎΠ±ΠΎΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΡ, Π»Π°Π±ΠΎΡΠ°ΡΠΎΡΠ½ΠΎ-Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ (Ρ
ΡΠΎΠΌΠ°ΡΠΎΠΌΠ°ΡΡ-ΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠΈΡ, ΠΏΠΈΡΠΎΠ»ΠΈΠ·, ΠΈΠ·ΠΎΡΠΎΠΏΠΈΡ, ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΡΠ°Π·ΠΎΠ²ΡΠΉ Π°Π½Π°Π»ΠΈΠ·, ΠΌΠ΅ΡΠΎΠ΄Ρ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΈ ΠΈΠ½ΡΠ΅ΡΠΏΡΠ΅ΡΠ°ΡΠΈΠΈ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ²). Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ·ΡΡΠ΅Π½ ΠΌΠΈΠ½Π΅ΡΠ°Π»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠΎΡΡΠ°Π² Π³Π»ΠΈΠ½ΠΈΡΡΠΎΠΉ ΡΡΠ°ΠΊΡΠΈΠΈ, ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π° Π·ΠΎΠ½Π°Π»ΡΠ½ΠΎΡΡΡ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π³Π»ΠΈΠ½ΠΈΡΡΡΡ
ΠΌΠΈΠ½Π΅ΡΠ°Π»ΠΎΠ². ΠΡΡΠ²Π»Π΅Π½Ρ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΡΠΎΡΡΠ°Π²Π° ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π½Π° ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΠΎΠΌ ΠΈ ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΠΎΠΌ ΡΡΠΎΠ²Π½ΡΡ
. ΠΠΎΠ»ΡΡΠ΅Π½Ρ ΠΏΠ΅ΡΠ²ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΏΠΎ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»Ρ Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ ΡΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΡΠΎΠ΄ΠΎΠ² ΠΈΠ· ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° ΠΎΡΠ°Π΄ΠΊΠΎΠ² Π»Π΅Π΄ΠΎΠ²ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ°, ΠΊΠΎΡΠΎΡΡΠ΅ Π΄ΠΎΠΌΠΈΠ½ΠΈΡΡΡΡ Π² ΠΌΠ΅Π»ΠΊΠΎΠ²ΠΎΠ΄Π½ΠΎΠΉ ΡΠ°ΡΡΠΈ ΠΠΎΡΡΠΎΡΠ½ΠΎ-Π‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π»ΡΡΠ°. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΏΠΎ Π΄Π°Π½Π½ΡΠΌ ΠΏΠΈΡΠΎΠ»ΠΈΠ·Π° ΠΈ Ρ
ΡΠΎΠΌΠ°ΡΠΎΠΌΠ°ΡΡΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠΈΠΈ, ΠΈΠΌΠ΅ΡΡ Π²ΡΡΠΎΠΊΡΡ ΡΡΠ΅ΠΏΠ΅Π½Ρ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΈ ΠΈ ΠΎΡΡΠ°ΠΆΠ°ΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ Π±ΠΈΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ², ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π°ΡΡΠΈΡ
ΠΏΡΠ΅Π²ΡΠ°ΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π½Π° ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΡΠ°Π΄ΠΈΡΡ
Π»ΠΈΡΠΎΠ³Π΅Π½Π΅Π·Π°. ΠΡΠΎΠΌΠ΅ ΡΠΎΠ³ΠΎ, ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΠΏΠ΅ΡΠ²ΡΠ΅ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»Π° Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ Π»Π΅Π³ΠΊΠΈΡ
ΡΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΡΠΎΠ΄ΠΎΠ² ΠΈΠ· Π‘ΠΎΡΠ³ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ².The present study seeks to improve current understanding of modern climate changes, which are considered as the consequences of the greenhouse effect caused by increasing content of the main greenhouse gases - carbon dioxide and methane. Complex studies in the land-shelf-atmosphere system across the Arctic shelf, including biogeochemical and lithological analyses of sediments across Eastern Arctic seas, are needed. The research aims to study both lithological and mineralogical sediment compositions, variability of the organic matter content (Corg), molecular and isotopic composition of carbon (Ξ΄13C) contained in the ice complex deposits (ICD) along the Laptev Sea coast (Cape Muostakh). Samples of modern bottom sediments obtained during the expedition of 2015 in the south-eastern part of the Laptev Sea were investigated. Methods used in the present study include GC:MS analysis, pyrolysis, isotope analysis, X:ray phase analysis followed by further numerical processing and interpretation. Results. The mineralogical composition of the clay fraction has been studied, and the distribution of clay minerals has been established. The features of molecular and isotopic Corg composition are revealed. Initial results on the hydrocarbon source of ICD:Corg, which dominates in the shallow part of the East Siberian Arctic shelf, are obtained. Pyrolysis and GC:MS data are highly correlated reflecting complex biogeochemical processes occurring during the Corg transformation at the various stages of lithogenesis. In addition, the study provides preliminary estimates of the light hydrocarbons generation potential for the Corg contained in the sediments. The aim of the work is to study the chemical composition of biological water of individual organs and tissues, on the example of domestic pigs, to obtain background characteristics for biogeochemical monitoring. The methods. Organs and tissues of seven-month domestic pig was sampled in Uspenka village, Pavlodar region (Kazakhstan) just after the slaughter and packed in plastics packages. Biological water was exudated by vacuum sublimation method upon the application of heat. The exudate was analyzed in certificated scientific-education center Β«WaterΒ» at Tomsk Polytechnic University by the method of inductively coupled plasma mass spectrometry according to the certified HCAM 480X method with NeXION 300D spectrometer. Result. The authors have studied the composition and characteristics of distribution of 70 chemical elements in biological water, separated by vacuum sublimation from the organs and tissues of the domestic pig, selected on the territory of the conditionally environmentally friendly village Uspenka, Pavlodar region. The interrelation between the elemental composition of the biological fluid and the physiological functions of the organs of the animals studied as well as the composition of the habitat was revealed