Abstract
The article presents the detailed analysis results considering bottom sediments from the Chukchi Sea. Two core samples, b16 and НС–8 were taken from the northern Herald Canyon 150 km northeast from NE Wrangel Island. Core b16 has been studied in more detail. According to the 210 Pb measurements, the recent sedimentation rate amounts to 0.9 mm/y – 1 at the sampling point. In the bottom layer of the core sample, the minimum concentrations of biogenic components (SiO 2bio , C org , N tot , and Br) and the increased concentrations of cold-water diatom species Thalassiosira antarctica may result from low biological productivity during the Maunder Minimum. A correlation with recent global warming (11–22 years) is shown by the increased concentrations of SiO 2bio , C org , N tot , and Br and the decreased values of magnetic susceptibility and X-ray density in the top layer (1–2 cm) of the same core sample. The results of our geochemical and diatom analysis support the available literature data and confirm that the Late Holocene sedimentation in the Chukchi Sea takes place in the zone wherein the water transits from the Pacific to the Arctic Ocean.
Highlights
Институт земной коры СО РАН, Иркутск, Россия 2 Институт геологии и минералогии им
B16 and НС–8 were taken from the northern Herald Canyon 150 km northeast from NE Wrangel Island
In the bottom layer of the core sample, the minimum concentrations of biogenic components (SiO2bio, Corg, Ntot, and Br) and the increased concentrations of cold‐water diatom species Thalas‐ siosira antarctica may result from low biological productivity during the Maunder Minimum
Summary
В значительной мере обусловленные изменениями инсоляции и орбитальных циклов Земли, оказывают существен‐ ное влияние на седиментацию в бассейнах Север‐ ного полушария [Levitan et al, 2007; Tsoy et al, 2017]. Вызывающих климатиче‐ ские флуктуации, проведения палеореконструкций и долгосрочных прогнозов необходимо детальное изучение процессов голоценового осадконакопле‐ ния, в том числе с учетом влияния геологических факторов. Актуальность этих исследований воз‐ растает в условиях современного потепления кли‐ мата на планете, которое является неоспоримым фактом [Brohan et al, 2006; Wilson et al, 2007] и ве‐ дет к значительным изменениям природной среды. В последние десятилетия отмечается резкое сокращение площади морского льда в Северном Ледовитом океане. Исследование выполнено с целью проведения ре‐ конструкции климатических событий последнего тысячелетия
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