The Morphometry of Ice Scours in the South-Western Part of the Kara Sea

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Дәйексөз келтіру

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Аннотация

The ice-gouging topography of the southwestern part of the Kara Sea bed is a result of the impact of icebergs and sea ice. During 52 cruise of the R/V Akademik Nikolaj Strakhov using a multibeam echo sounder we collected a representative data of key parameters of ice scours (location, orientation, depth, width) for the first time, which allows us to draw conclusions on a regional scale. We revealed regularities in the distribution of the ice scours both in space and in depth and their density in different parts of the seabed. It was revealed that the maximum dimensions of the ice scours decrease with the distance from the sources of iceberg calving from NW to SE. The orientation of the ice scours correlates with the main drift directions of the icebergs. Most of the ice scours are located at depths up to 220 m and could have formed both at modern and at lower sea level (in post-glacial time). We identified a high degree of the seabed transformation by ice-gouging processes in the southwestern part of the Kara Sea.

Толық мәтін

Рұқсат жабық

Авторлар туралы

S. Maznev

Geological Institute, Russian Academy of Sciences; Lomonosov Moscow State University

Хат алмасуға жауапты Автор.
Email: svmaznev@gmail.com
Ресей, Moscow; Moscow

O. Kokin

Geological Institute, Russian Academy of Sciences; Lomonosov Moscow State University

Email: svmaznev@gmail.com
Ресей, Moscow; Moscow

V. Arkhipov

Geological Institute, Russian Academy of Sciences; Lomonosov Moscow State University

Email: svmaznev@gmail.com
Ресей, Moscow; Moscow

E. Moroz

Geological Institute, Russian Academy of Sciences

Email: svmaznev@gmail.com
Ресей, Moscow

A. Denisova

Geological Institute, Russian Academy of Sciences; Lomonosov Moscow State University

Email: svmaznev@gmail.com
Ресей, Moscow; Moscow

R. Ananiev

Shirshov Institute of Oceanology, Russian Academy of Sciences

Email: svmaznev@gmail.com
Ресей, Moscow

S. Nikiforov

Shirshov Institute of Oceanology, Russian Academy of Sciences

Email: svmaznev@gmail.com
Ресей, Moscow

N. Sorokhtin

Shirshov Institute of Oceanology, Russian Academy of Sciences

Email: svmaznev@gmail.com
Ресей, Moscow

S. Godetskiy

Geological Institute, Russian Academy of Sciences

Email: svmaznev@gmail.com
Ресей, Moscow

Әдебиет тізімі

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Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Plots of zoning of the distribution of plowing furrows on the bottom of the Kara Sea along the route of the 52nd voyage of the R/V “Akademik Nikolai Strakhov”: 1 - areas without furrows, 2 - areas with low density of furrows, 3 - areas with high density of furrows, 4 - areas of polygonal survey.

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3. Fig. 2. Example of DEM with high density of furrows (site 2, see Fig. 1 for position).

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4. Fig. 3. Distribution (left) and relative density (right) of plowing furrows over 20-m depth ranges. Black - all furrows, white - large furrows.

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5. Fig. 4. Distribution of values of depth and width of plowing furrows

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6. Fig. 5. Plan view and cross section through the U-shaped furrow east of Middle Yamal (Site 9, see Fig. 1 for position).

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7. Fig. 6. Plan view and cross-sectional profile through the V-shaped furrow east of Middle Yamal (Site 9, see Fig. 1 for position).

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8. Fig. 7. Plan view of a comb of two furrows in Baidaratskaya Bay (site 11, see Fig. 1 for position), one of which (left in the profile) has a box-shaped transverse profile.

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9. Fig. 8. Directions of plowing furrows: on the left - all furrows, on the right - large furrows.

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10. Fig. 9. Direction of furrows by plot.

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