Northern margin of the Barents Sea shelf after the Little Ice Age: variability of the drift ice edge and sedimentation dynamics

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

This paper presents the results of a study of the bottom sediments of the northern margin of the Barents Sea shelf, carried out within the framework of the Transarctic 2019 expedition. The exposed bottom sediments with a thickness of 11 to 18 cm began to form approximately 300–400 years ago. The sedimentary strata are composed of pelite and siltstone fractions with local periodic inclusions of coarse-grained particles. After the Little Ice Age (LIA), sedimentation rates in the area of the northern margin of the Barents Sea shelf varied in time and space from 0.04 to 0.19 cm/year, with average values of 0.04–0.1 cm/year. The main factor of sedimentation north of the strait between Spitsbergen and Franz Josef Land is ice and iceberg spread of terrigenous sediments. Chronostratigraphic studies indicate a significant impact of global climate change on the sedimentation regime in the northern Barents Sea shelf after the end of the LIA in the late 18th – early 19th centuries. The periodicity of changes is close to climatic periods of 50–60 years. However, in the direction from southwest to northeast, there is a lag of peaks of approximately 20 years (according to our observations of the structure of the sedimentary cover and the intensity of sedimentation). Due to local changes in the sedimentation regime after the LIA, three areas have been identified that differ in the response of sedimentogenesis to climate change: 1) the high response area – the northeast of the Spitsbergen archipelago; 2) the moderate response zone – the northern shelf of the Franz Josef Land archipelago; 3) the low response zone – Franz Victoria Trench area.

Толық мәтін

Рұқсат жабық

Авторлар туралы

G. Ilyin

Murmansk Marine Biological Institute of the Russian Academy of Sciences

Email: meshcheriakov104@mail.ru
Ресей, Murmansk

N. Meshcheryakov

Murmansk Marine Biological Institute of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: meshcheriakov104@mail.ru
Ресей, Murmansk

I. Usyagina

Murmansk Marine Biological Institute of the Russian Academy of Sciences

Email: meshcheriakov104@mail.ru
Ресей, Murmansk

O. Kokin

Geological Institute of the Russian Academy of Sciences

Email: meshcheriakov104@mail.ru
Ресей, Moscow

Әдебиет тізімі

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Қосымша файлдар

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Әрекет
1. JATS XML
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2. Fig. 1. Seabed sediment core sampling at the northern margin of Barents Sea shelf. RV “Academician Treshnikov”, March–May 2019

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3. Fig. 2. The long-term displacement of the drifting ice edge in August relative to the location of sediment cores ST5-6 (а), ST3-4 (б) and ST1-2 (в) for 1901–2024. Positive values correspond to the ice edge to the S or W (the point is in the drift ice area), and negative values correspond to the ice edge to the N or E (the point is in open water)

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4. Fig. 3. The results of determining the specific activity of radionuclides – natural 210Pbex (а) and man-made 137Cs and 90Sr (б), as well as the age of sedimentary horizons (в), calculated using CFCS, CIC (CA) and CRS(CF) models, dates (n±δ) indicate the years of formation of the layers, confirmed by geochronological markers

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5. Fig. 4. Chronology of the formation of lithotypes of bottom sediments on the northern margin of the Barents Sea shelf: ST5-6 (а); ST3-4 (б); ST1-2 (в). Legend: 1 – Coarse–grained (ice material), 2 – Sandy silt, 3 – Silt, 4 – Clay silt. *Age is indicated taking into account the established variations in the maximum and minimum values of sedimentation rates from the end of the 19th – beginning of the 21st centuries

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6. Fig. 5. Sedimentation rate (cm/year) in the studied areas

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