Holocene Interactions Between Glacier Retreat, Sea Ice Formation, and Atlantic Water Advection at the Inner Northeast Greenland Continental Shelf

Syring, Nicole; Lloyd, Jeremy M.; Stein, Rüdiger; Fahl, Kirsten; Roberts, Dave; Callard, Louise; Ó'Cofaigh, Colm

doi:10.1029/2020pa004019

Cited by 28 publications

(36 citation statements)

References 137 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1A), C. neoteretis and C. reniforme likewise dominate with up to >80 and 60%, respectively, together with maximum flux of both benthic and planktic foraminifera (Syring et al . 2020a). Sea‐ice proxy IP 25 and other biomarker data from core PS93/025–2 (Fig.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Northeast Greenland: ice‐free shelf edge at 79.4°N around the Last Glacial Maximum 25.5–17.5 ka

Rasmussen

Pearce

Andresen

et al. 2022

Boreas

View full text Add to dashboard Cite

The size of the last glacial ice sheet on the Northeast (NE) Greenland shelf and its interaction with ocean circulation have been the subject of debate. Here we provide insights into the extent of the ice sheet around the Last Glacial Maximum (LGM) and investigate timing and strength of changes in the flow of Atlantic Water. The study is based on a multiproxy investigation of a marine sediment core, gravity core DA17-NG-ST01-019G, from 323-m water depth at the NE Greenland shelf edge at 79.4°N. We present benthic and planktic foraminiferal distribution data, AMS-14 C dates, sedimentological (ice-rafted debris (IRD) and grain sizes), and geochemical (XRF) data in combination with geophysical (sub-bottom profiler) data. The oldest sediments at the study site are dated to 25.5-17.5 ka, encompassing the time frame from the beginning of the LGM to the early deglaciation. This part is overlain by sediments from the late deglaciation and Holocene. The deposits dating from the LGM are very rich in both planktic and benthic foraminifera and macrofossils of excellent preservation. The faunas show that the site generally was affected by a strong flow of relatively warm subsurface Atlantic Water during the LGM and Early Holocene. Conditions turned more polar with cold bottom water flow in the Middle-Late Holocene (c. 7.5 ka to Recent) with presence of mainly agglutinated benthic foraminiferal species. Our data from the LGM also indicate that the deposits were mixed by iceberg scouring, confirmed by the geophysical data showing extensive ploughing of the sediments on the outer shelf area. The results further indicate that the Greenland Ice Sheet did not reach to the edge of the NE Greenland shelf at 79.4°N during the LGM 24-18 ka.

show abstract

Section: Discussionmentioning

confidence: 99%

“…The variability of the EGC and sea ice cover on the NE Greenland shelf has been investigated for the Holocene interglacial (Notholt 1998; Syring et al . 2020a, b; Davies et al . 2022; Pados‐Dibattista et al .…”

Section: Figmentioning

confidence: 99%

Northeast Greenland: ice‐free shelf edge at 79.4°N around the Last Glacial Maximum 25.5–17.5 ka

Rasmussen

Pearce

Andresen

et al. 2022

Boreas

View full text Add to dashboard Cite

show abstract

“…Now, the NØIB consists mainly of first‐year ice (Sneed & Hamilton, 2016). To the north, at about 79.5°N, the Northeast Water (NEW) Polynya is located and generally opens in spring and could reach from the Greenland coast to about 10°W (e.g., Minnett et al., 1997; Schneider & Budéus, 1997; Syring et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Submarine Meltwater From Nioghalvfjerdsbræ (79 North Glacier), Northeast Greenland

et al. 2021

View full text Add to dashboard Cite

The Greenland Ice Sheet (GrIS) faces accelerated melting under a warming climate, and the GrIS mass loss contributed about 25% to the global sea-level rise in the time period 2006(Oppenheimer et al., 2019. The involved processes are surface melting, iceberg calving, and submarine melting through the contact of warm water with marine-terminating glaciers and floating ice tongues. N. Wilson et al. (2017) showed that the latter mechanism is the major contributor for mass loss of the three largest floating ice tongues in northern Greenland. The meltwater from the GrIS is not only contributing to global sea-level rise, but could affect the regional circulation by changing the seawater density structure (e.g., Grivault et al., 2017). When transferred into the basin interior of the Labrador and Irminger seas, this additional freshwater might have consequences for the water mass transformation of Atlantic Meridional Overturning Circulation components (Böning et al., 2016). The analysis of noble gas data revealed that the presence of submarine meltwater

show abstract

“…The AW advection into the eastern Nordic Seas increased to a maximum around 10 ka BP and finally reached the Arctic Ocean (Figure 7), a process that can be regarded as an analogue to the recent Atlantification (Spielhagen et al, 2011;Tesi et al, 2021). Based on the indications of AW presence on the western side of the Fram Strait (GR02, Syring et al, 2020;Zehnich et al, 2020), we suggest the activation of the direct east-west AW recirculation, that is, the RAC, already in the early Holocene (c. 11.5 ka BP). It is suggested that the 'overshoot' of AMOC around 10 ka BP (Risebrobakken et al, 2011) was caused by its reduced strength through the deglaciation and the resulting buildup of a North Atlantic subsurface reservoir of heat and salt that was (Telesiński et al, 2014a;red;Telesiński et al, 2014b), GR02 (blue; this study), JM07-015 (pink; Telesiński et al, 2018) and M23258 (orange;Risebrobakken et al, 2011).…”

Section: Implications For Aw Circulation In the Nordic Seasmentioning

confidence: 99%

The significance of Atlantic Water routing in the Nordic Seas: The Holocene perspective

et al. 2022

View full text Add to dashboard Cite

The Nordic Seas are a key region for global ocean circulation, crucial in water mass exchange between the North Atlantic and the Arctic oceans, and deepwater formation. The advection of Atlantic Water (AW) to the Nordic Seas is decisive for the oceanography and climate of the region and beyond. Here, we present a set of sedimentary records, including two new cores from the western Nordic Seas to reconstruct the history of AW routing in the Nordic Seas over the Holocene. Our results show that the early Holocene (11.7–8 ka BP) thermal maximum, caused by an ‘overshoot’ of overturning circulation and high insolation, was limited to the eastern Nordic Seas, while the western part remained cold due to the meltwater blocking the spreading of AW. After 8 ka BP, the retreat of the freshwater lid allowed AW to reach the central Greenland Sea, where deep convection developed. After 5 ka BP, the increase in sea-ice export from the Arctic strengthened deep convection, which intensified the westward AW flow. A disruption of convectional activity around 2.7 ka BP, triggered by a minimum in solar activity, caused cooling and expansion of sea ice in the Nordic Seas and might have contributed to a global climatic deterioration. The overturning circulation in the Nordic Seas did not recover to its previous state until the present. We demonstrate that the rate of AW advection into the Nordic Seas alone is not enough to understand the oceanographic evolution of this area and its influence on regional or even global ocean and climate changes. The shifts in AW routing within the Nordic Seas and the rate of deep convection are also important.

show abstract

Holocene Interactions Between Glacier Retreat, Sea Ice Formation, and Atlantic Water Advection at the Inner Northeast Greenland Continental Shelf

Cited by 28 publications

References 137 publications

Northeast Greenland: ice‐free shelf edge at 79.4°N around the Last Glacial Maximum 25.5–17.5 ka

Northeast Greenland: ice‐free shelf edge at 79.4°N around the Last Glacial Maximum 25.5–17.5 ka

Submarine Meltwater From Nioghalvfjerdsbræ (79 North Glacier), Northeast Greenland

The significance of Atlantic Water routing in the Nordic Seas: The Holocene perspective

Contact Info

Product

Resources

About