A Eurasian Basin sedimentary record of glacial impact on the central Arctic Ocean during MIS 1–4

Dong, Linsen; Polyak, Leonid; Xiao, Xiaotong; Brachfeld, Stefanie Ann; Liu, Yanguang; Shi, Xuefa; Fang, Xisheng; Bai, Yang; Zhu, Aimei; Li, Chaoxin; Zhao, Song; Dong, Wei; Wang, Chunjuan

doi:10.1016/j.gloplacha.2022.103993

Cited by 4 publications

(2 citation statements)

References 142 publications

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“…In addition, in the central Arctic sediment cores during glacial periods, organic carbon accumulation is known to be generally lower 56 than in present-day oxygenated conditions 8 . Indeed, the contents of total organic carbon at site PS72/410-1 are relatively higher during the Holocene compared to the last glacial period, even after correcting time-dependent decrease in total organic carbon by organic matter degradation 57,58 (Supplementary Fig. 1).…”

Section: Resultsmentioning

confidence: 98%

Arctic deep-water anoxia and its potential role for ocean carbon sink during glacial periods

Jang

Woo

Kim³

et al. 2023

Commun Earth Environ

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Deep water freshening beneath pan-Arctic ice shelves has recently been proposed based on the absence of excess thorium in glacial Arctic sediments. This profound proposal requires scrutiny of Arctic paleohydrology during past glacial periods. Here, we present structural and geochemical results of inorganic authigenic carbonates in deep-sea glacimarine sediments from the Mendeleev Ridge, western Arctic Ocean over the last 76 kyr. Our results suggest that Polar Deep Water in the western Arctic became brackish and anoxic during stadial periods. We argue that sediment-laden hyperpycnal meltwater discharged from paleo-ice sheets filled much of the water column depending upon the density, substantially reducing the salinity and oxygen content of the Polar Deep Water. Our findings suggest that this phenomenon was more extreme in the western Arctic Ocean and may point to the potential role of the western Arctic Ocean as an additional carbon reservoir in the global carbon cycle across glacial-interglacial cycles.

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Section: Resultsmentioning

confidence: 98%

Arctic deep-water anoxia and its potential role for ocean carbon sink during glacial periods

Jang

Woo

Kim³

et al. 2023

Commun Earth Environ

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“…2019; Dong et al . 2022) and the chronological assignments of Zhao et al . (2022) are subject to debate.…”

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confidence: 90%

A resilient ice cover over the southernmost Mendeleev Ridge during the late Quaternary

Song,

Hillaire‐Marcel,

de Vernal

et al. 2023

Boreas

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The presence of a late Quaternary ice sheet/ice shelf over the East Siberian Sea has been proposed in several papers. Here, we further document its duration/resilience based on the sedimentary, bulk mineralogical, and geochemical (organic matter content and its stable isotopic composition, U‐Th series) properties of a core raised from the southernmost Mendeleev Ridge. The chronostratigraphy of the studied core was mainly built from the 230Th excess (230Thxs) distribution and decay downcore. At the core‐top, peaking 230Thxs values during the early MIS 3 and mid‐MIS 1 encompassing an MIS 2 hiatus were observed. As documented in several papers, these peaks suggest seasonally open ice conditions over proximal continental shelves. Below, the interval spanning MIS 4 and possibly MIS 5d records major ice‐rafting events illustrated by overall high coarse‐fraction contents. Underlying MIS 5e, down to MIS 11, the sediment depicts relatively low sand (1.7±2.5 dw%), high clay (33.5±4.7 dw%), and very low organic carbon (0.10±0.06 dw%) contents, and low δ13Corg values (−24.3±0.9‰). This section is interpreted as recording fine sediment transport by deep currents and/or meltwater plumes below a resilient ice cover, only interrupted by a few short‐duration events. These events include (i) detrital carbonate pulses assigned to deglacial events along the NW Laurentide Ice Sheet margin (Termination (T) III), and (ii) intervals with some planktonic foraminifer occurrences, likely relating to their advection from open areas of the Arctic Ocean (MIS 5e, 9 and 11). All Terminations, but TII and the early MIS 3, show peaking Mn/Al values linked to the submergence of Arctic shelves under a rising sea level. We conclude that the resilient ice cover, likely an ice shelf, has been present over the southern Mendeleev Ridge during most of the interval after the Mid‐Pleistocene Transition and was favoured by the low summer insolation of the MIS 14 to 10 interval.

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Depositional and circulation changes at the Chukchi margin, Arctic Ocean, during the last two glacial cycles

Xiao,

Polyak,

Zhang

et al. 2024

Global and Planetary Change

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A Eurasian Basin sedimentary record of glacial impact on the central Arctic Ocean during MIS 1–4

Cited by 4 publications

References 142 publications

Arctic deep-water anoxia and its potential role for ocean carbon sink during glacial periods

Arctic deep-water anoxia and its potential role for ocean carbon sink during glacial periods

A resilient ice cover over the southernmost Mendeleev Ridge during the late Quaternary

Depositional and circulation changes at the Chukchi margin, Arctic Ocean, during the last two glacial cycles

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