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Tatyana G. Perevertaylo

Head of the Laboratory, PhD

2a Lenin Ave., Building 20, Office 221

 73 Sovetskaya St., Building 1, Office 217

 +7(3822) 42-63-81

 ptg@tpu.ru

Igor P. Semiletov

Leading Scientist, Professor of the 

University Alaska Fairbanks,

Head of the Laboratory of Arctic 

Research

 semiletov@tpu.ru

The laboratory was established with funding of the Ministry of Education and Science of the Russian Federation in the framework of the project - The Siberian Arctic Shelf as a Source of Greenhouse Gases of Planetary Significance: Quantitative Assessment of Flows and Identification of Possible Environmental and Climatic ConsequencesThe research is conducted under the supervision of Professor Igor Semiletov.


The project main goal is to identify characteristic features and estimate the extent of spatiotemporal variability of the basic components of the carbon cycle on the Siberian Arctic shelf under conditions of warming and degradation of the permafrost. The particular attention is paid to the widest and shallowest shelf of the World Ocean, that is the Eastern Arctic seas (EAS), as a source of the greenhouse gases of global significance.


Main tasks

  • Study processes, responsible for the current and future emission of the major greenhouse gases (methane and carbon dioxide) from the Siberian Arctic Shelf into the atmosphere with a particular focus on the East Siberian Arctic shelf, the widest and shallowest shelf of the World Ocean
  • Quantitative analysis of atmospheric emission rate of the major greenhouse gases and study of these processes for the regional and global balance of methane and carbon dioxide, and for carbon cycle in the Arctic in general
  • Quantitative assessment of degradation rate of the permafrost in context of creating a model for transformation of methane potential and release of methane into the water column and the atmosphere for various scenarios of climate change.


The laboratory conducts research in two main areas:

  1. The development and expansion of comprehensive studies focused on clarifying the role of underwater permafrost, possible destabilization of hydrates, upward flow of gas from deep geological sources. That is processes, determining the amount of methane emission from sediments into water and atmosphere. It is this aspect that crucially important for the understanding of formation mechanism of the atmospheric maximum of CH4 over the Arctic in the Holocene, i.e. the present time, and in the previous warm geological epochs.
  2. The laboratory studies and identifies the core processes, responsible for developing a pool of ancient organic matter (OM) ground origin in the modern bottom sediments. They can lead to disbalance between the main components of the carbon cycle on the Arctic shelf due to oxidation of surface OM  to CO2, thereby causing intensification of the greenhouse effect.


The main research results:

Based on comprehensive biogeochemical, geophysical, and geological studies we carried out quantitative assessment of the bubble methane flow on the shelf of the Eastern Arctic seas (MBA).  It was found out that depending on the state of underwater permafrost (the data obtained from core drilling, geophysical studies, and an improved mathematical model) the flow can be broken into 5 types from mg to hundreds of grams per square meter per day (Shakhova, Semiletov et al., Phil. Trans. R. Soc., 2015).

 

  • Based on more than 200,000,000 precision measurements of the atmospheric methane concentration and more than 14,000 measurements of dissolved methane concentration, we found out abnormally high concentrations of methane in EAS. It is worth noting, that the highest values of atmospheric methane were found in areas of massive emissions of bubble methane, where it was up to 3.5-8.0 ppm, i.e. it is many times higher than the average concentration on the earth.


  • We found out that the source of the bubble emission is not only the Laptev Sea regions with its high seismotectonic activity, but geologically passive regions of the EAS shelf, and the marine lagoons. We assumed, that the discovery of the major emissions of bubble methane in the central part of the East Siberian Sea may indicate the presence of an abnormal geothermal flow. This contradicts the accepted paradigm of seismotectonic passivity of the East Siberian Sea. To study this new fundamental problem we are going to carry out comprehensive geophysical and geological studies jointly with leading Russian institutes and universities.


  • We have proved, that the main factors, determining the significant supersaturation of the EAS waters with carbon dioxide and extreme abstraction of the EAS waters, are:   1) the growing influence of river runoff and degradation of permafrost, which is manifested in increase of erosive ground organic matter, which is mineralized on the shelf, thereby increasing the concentration of carbon dioxide in seawater (Semiletov et al., Nature Geoscience, 2016); 2) the increase in the temperature of surface water upon the reduction in the ice extent of the Arctic seas.
  • For the first time, we have identified volatility of exports of terrestrial organic matter of various genesis over the past 9500 years. It was found out, that the export of erosional carbon has dominated all the time. This signal is more significant in the East Siberian Sea, comparing with the Laptev Sea. On the other side, in the Laptev Sea, the soil light organic matter has made a more tangible contribution. It was shown, that the maximum export rate of erosional carbon is typical for the last 1700 years and for the time period 9500-9300 and 8500-8300 years ago. These results expand the boundaries of fundamental studies, aimed at identifying and assessing of processes, determining export and transformation of ground organic matter of the present time, which were summarized in an author's monograph (Semiletov et al., 2017).


The core academic papers, that reflects the laboratory research achievements:

  • Semiletov I., Pipko I., Gustafsson O., Anderson L.G., Sergienko V., Pugach S., Dudarev O., Charkin A., Gukov A., Broder L., Andersson A., Spivak E., Shakhova N. Acidification of East Siberian Arctic Shelf waters through addition of freshwater and terrestrial carbon // Nature Geoscience, 2016, vol. 9, 361-365, doi: 10.1038/NGEO2695.
  • Sapart, C. J., Shakhova, N., Semiletov, I., Jansen, J., Szidat, S., Kosmach, D., Dudarev, O., van der Veen, C., Egger, M., Sergienko, V.; Salyuk, A., Tumskoy, V., Tison, J.L., Rockmann, T. The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis // Biogeosciences, 14, 9, 2283-2292, 2017.
  • Shakhova N., Semiletov I., Sergienko V., Lobkovsky L., Yusupov V., Salyuk A., Salomatin A., Chernykh D., Kosmach D., Panteleev G., Nicolsky D., Samarkin V., Joye S., Charkin A., Dudarev O., Meluzov A. and Gustafsson O. The East Siberian Arctic Shelf: towards further assessment of permafrost-related methane fluxes and role of sea ice // Phil. Trans. R. Soc. A, 2015, 373: 20140451. (Philosophical Transactions of the Royal Society A). http://dx.doi.org/10.1098/rsta.2014.0451).
  • Semiletov I.P., Dudarev O.V., Pipko I.I., Pugach S.P., Sergienko V.I., Chubik P.S., Mazurov A.K., Shakhova N.E. The carbon cycle in the seas of the Eastern Arctic at the turn of the XX-th and XXI-st centuries.  Book 1. Transportation and Transformation of Carbon in the System - Land-Shelf/Tomsk Polytechnic University publishing house, 2017.  – 545 p.
  • Dudarev O.V., Charkin A.N., Shakhov N.E., Mazurova A.K., Semiletov I.P. The Modern Lithomorphogenesis on the East Arctic shelf of Russia. - Tomsk: Tomsk Polytechnic University publishing house, 2016. – 192 p.


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