Global geodynamic model of the Earth and its application for the Arctic region

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Resumo

A geodynamic model of the modern Earth is constructed based on the SMEAN2 global seismic tomography model with an emphasis on the Arctic region. For a spherical Earth model, a solution to the Stokes equation for a viscous fluid was obtained based on seismic tomography data using the finite element method using the CitcomS code. The resulting distributions of temperature anomalies and velocity fields of mantle flows explain the main features of the modern geodynamics of the Arctic region. The temperature difference in the subcrustal mantle between the relatively “cold” western Arctic shelf (Barents and Kara seas) and the “warmer” eastern Arctic shelf (from the Laptev Sea to the Bering Strait) reaches 100 degrees, which correlates with the observed intense methane emission from the shallow shelf of the Eastern Arctic caused by permafrost degradation and destruction of gas hydrates against the background of elevated environmental temperatures. The greenhouse effect of methane in the atmosphere, in turn, contributes to climate warming in the Arctic. The region of Iceland and eastern part of Greenland, under the influence of the mantle upwelling, is characterized by a hot subcrustal mantle and increased heat flow at the surface, causing instability and melting of the Greenland ice sheet from below.

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Sobre autores

L. Lobkovsky

P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences

Email: aabaranov@gmail.com

Academician of the RAS

Rússia, Moscow

A. Baranov

Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences

Autor responsável pela correspondência
Email: aabaranov@gmail.com
Rússia, Moscow

A. Bobrov

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: aabaranov@gmail.com
Rússia, Moscow

A. Chuvaev

MIREA – Russian Technological University

Email: aabaranov@gmail.com
Rússia, Moscow

Bibliografia

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2. Fig. 1. Distribution of temperature anomalies in the mantle at a depth of 75 km. The black line shows the contours of the continents. The red lines are sections of the Earth at 20 and 200 degrees east latitude. The pink lines are sections of the Earth at 160 and 340 degrees east longitude.

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3. Рис. 2. Распределение аномалий температуры и скоростей течений в мантии Земли в сечении по 20 и 200 градусу восточной долготы (красная рамка на рис. 1). Кружками показаны зоны субдукции: 1 – Алеутская, 2 – Средиземноморская.

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4. Fig. 3. Distribution of temperature anomalies and flow velocities in the Earth’s mantle in the cross-section at 160 and 340 degrees east longitude (pink frame in Fig. 1).

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5. Fig. 4. Spherical equidistant projection centered on the North Pole. The color scale shows temperature anomalies in the mantle at a depth of 75 km, and the black lines show the contours of the continents.

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