Driving Mechanisms of Sedimentary <sup>230</sup>Th and <sup>231</sup>Pa Variability in the Western Arctic Ocean Through the Last Glacial Cycle

Xu, Qijin; Wei, Xiao; Wang, Rujian; Süfke, Finn; Lippold, Jörg; Not, Christelle

doi:10.1029/2020pa004039

Cited by 4 publications

(5 citation statements)

References 97 publications

(216 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2019; Xu et al . 2021) and modelled (Obase & Abe‐Ouchi 2019) throughout the western North Atlantic, providing a probable driver for such an enhanced northward advection of Atlantic Waters to Baffin Bay via the WGC. Our results indicate that the effects of this invigoration have reached at least as far north as the Upernavik trough.…”

Section: Discussionmentioning

confidence: 99%

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Weiser

Titschack

Hebbeln

2023

Boreas

View full text Add to dashboard Cite

Under glacial climates, continental ice sheets such as, e.g., the Greenland Ice Sheet, extended onto the continental shelves and often carved out deep cross-shelf troughs. The sedimentary infill of such troughs commonly is a product of the complex interactions between the ice sheets, largely driving sediment input into the ocean, and the surrounding water masses. Off West Greenland, research has focused on the Disko and Uummannaq troughs, leaving the northerly adjacent Upernavik trough relatively understudied. Hence, neither the chronology of deglaciation nor the details of its postglacial infill are sufficiently well understood. Here, we combine computed tomography image-derived information with geochemical and granulometric data from four sediment cores recovered from the Upernavik trough that point to (i) deglaciation of the mid-shelf probably around 13.4 cal. ka BP that was most likely driven by a northward advection of warmer Atlantic waters during the Bølling-Allerød, (ii) the presence of widespread mass wasting around 8 cal. ka BP on the inner shelf and (iii) the complex interplay between various modes of sediment input, transport and deposition under hemipelagic sedimentation afterwards. While this interplay complicates provenance studies, we identify two major sediment delivery mechanisms that control transport and deposition from four sediment source areas. Through the Early Holocene the relative contributions of sediments from the various sources changed from a predominantly local origin to more southerly sources, mainly driven by decreasing input from the local sources. The integration of relative sediment source contributions with varying sedimentation rates challenges previous studies postulating intensified sediment delivery from the south through a greater influence of the West Greenland Current and highlights the need for the integration of sediment input and transport mechanisms into provenance studies in the area.

show abstract

Section: Discussionmentioning

confidence: 99%

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Weiser

Titschack

Hebbeln

2023

Boreas

View full text Add to dashboard Cite

show abstract

“…Core MA01 from Xu et al . (2021); core MC11 from Not & Hillaire‐Marcel (2010); cores PS2185‐3/6 and PS2200‐5 from Vogt (1997), Strobl (1998) and Behrends et al . (1999).…”

Section: Discussionmentioning

confidence: 99%

“…2020; Xu et al . 2021; Park et al . 2022) from the northern Mendeleev Ridge provide information about sedimentological and organic matter properties, in addition to 230 Th xs profiles allowing for the set up of similar chronostratigraphies.…”

Section: Discussionmentioning

confidence: 99%

“…Red data from the study core E25; blue data from core MA01 (Xu et al . 2021; Park et al . 2022); olive data from core MC11 (Not & Hillaire‐Marcel 2010).…”

Section: Discussionmentioning

confidence: 99%

“…2020; Xu et al . 2021). The inception of such a resilient ice shelf could have been linked to the MIS 14–10 low insolation interval, thus possibly marking the MIS 14 glacial inception.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

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

Song,

Hillaire‐Marcel,

de Vernal

et al. 2023

Boreas

View full text Add to dashboard Cite

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.

show abstract

Cycling and behavior of 230Th in the Arctic Ocean: Insights from sedimentary archives

Song¹,

Hillaire‐Marcel²,

Liu³

et al. 2023

Earth-Science Reviews

View full text Add to dashboard Cite

Driving Mechanisms of Sedimentary ²³⁰Th and ²³¹Pa Variability in the Western Arctic Ocean Through the Last Glacial Cycle

Abstract: Pleistocene paleoenvironmental reconstructions of the Arctic Ocean are largely limited by the lack of precise chronology on deep-sea sediment sequences due to poor preservation of biogenic carbonate (e.g., foraminifera) (

Cited by 4 publications

References 97 publications

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

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

Cycling and behavior of 230Th in the Arctic Ocean: Insights from sedimentary archives

Contact Info

Product

Resources

About

Driving Mechanisms of Sedimentary 230Th and 231Pa Variability in the Western Arctic Ocean Through the Last Glacial Cycle

Abstract: Pleistocene paleoenvironmental reconstructions of the Arctic Ocean are largely limited by the lack of precise chronology on deep-sea sediment sequences due to poor preservation of biogenic carbonate (e.g., foraminifera) (

Cited by 4 publications

References 97 publications

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

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

Cycling and behavior of 230Th in the Arctic Ocean: Insights from sedimentary archives

Contact Info

Product

Resources

About

Driving Mechanisms of Sedimentary ²³⁰Th and ²³¹Pa Variability in the Western Arctic Ocean Through the Last Glacial Cycle