New insights into sea ice changes over the past 2.2 kyr in Disko Bugt, West Greenland

Kolling, Henriette Marie; Stein, Ruediger; Fahl, Kirsten; Perner, Kerstin; Moros, Matthias

doi:10.1007/s41063-018-0045-z

Cited by 14 publications

(15 citation statements)

References 142 publications

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“…The area marked with the dotted black line indicates the approximate extent of the North Water Polynya, and the solid white triangle, hexagon, and diamond indicate the location of Cores AMD14-Kane2B (Kane Basin), AMD14-204C (Upernavik), and MSM343300 (Disko Bay), respectively. B Satellite-based modern, monthly sea ice concentrations in (%, 1978-2015 [24]; updated 2015) in Baffin Bay for (a) winter (Jan-Mar), (b) spring (Apr-Jun), (c) summer (Jul-Sept), and (d) autumn (Oct-Dec), adapted from Kolling et al [62]. The white dot indicates the position of Core GeoB19927, and the white diamond indicates the location of core MSM343300 in Disko Bay ◂ arktos conditions, and a variable amount of these biomarkers may reflect changing seasonal sea ice cover.…”

Section: Biomarker Proxies For Paleo-environmental Reconstructionmentioning

confidence: 99%

Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay

Saini

Stein

Fahl

et al. 2020

Arktos

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Arctic sea ice is a critical component of the climate system, known to influence ocean circulation, earth's albedo, and ocean-atmosphere heat and gas exchange. Current developments in the use of IP 25 (a sea ice proxy with 25 carbon atoms only synthesized by Arctic sea ice diatoms) have proven it to be a suitable proxy for paleo-sea ice reconstructions over hundreds of thousands to even millions of years. In the NE Baffin Bay, off NW Greenland, Melville Bugt is a climate-sensitive region characterized by strong seasonal sea ice variability and strong melt-water discharge from the Greenland Ice Sheet (GIS). Here, we present a centennial-scale resolution Holocene sea ice record, based on IP 25 and open-water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III) using core GeoB19927-3 (73° 35.26′ N, 58° 05.66′ W). Seasonal to ice-edge conditions near the core site are documented for most of the Holocene period with some significant variability. In the lower-most part, a cold interval characterized by extensive sea ice cover and very low local productivity is succeeded by an interval (~ 9.4-8.5 ka BP) with reduced sea ice cover, enhanced GIS spring melting, and strong influence of the West Greenland Current (WGC). From ~ 8.5 until ~ 7.8 ka BP, a cooling event is recorded by ice algae and phytoplankton biomarkers. They indicate an extended sea ice cover, possibly related to the opening of Nares Strait, which may have led to an increased influx of Polar Water into NE-Baffin Bay. The interval between ~ 7.8 and ~ 3.0 ka BP is characterized by generally reduced sea ice cover with millennial-scale variability of the (late winter/early spring) ice-edge limit, increased open-water conditions (polynya type), and a dominant WGC carrying warm waters at least as far as the Melville Bugt area. During the last ~ 3.0 ka BP, our biomarker records do not reflect the late Holocene 'Neoglacial cooling' observed elsewhere in the Northern Hemisphere, possibly due to the persistent influence of the WGC and interactions with the adjacent fjords. Peaks in HBI III at about ~ 2.1 and ~ 1.3 ka BP, interpreted as persistent ice-edge situations, might correlate with the Roman Warm Period (RWP) and Medieval Climate Anomaly (MCA), respectively, in-phase with the North Atlantic Oscillation (NAO) mode. When integrated with marine and terrestrial records from other circum-Baffin Bay areas (Disko Bay, the Canadian Arctic, the Labrador Sea), the Melville Bugt biomarker records point to close ties with high Arctic and Northern Hemispheric climate conditions, driven by solar and oceanic circulation forcings.

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Section: Biomarker Proxies For Paleo-environmental Reconstructionmentioning

confidence: 99%

Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay

Saini

Stein

Fahl

et al. 2020

Arktos

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“…Trends recorded by surface water proxies, however, document the surface ocean response to meltwater discharge from the Greenland Ice Sheet and the duration of sea ice cover (e.g., Moros et al, ). For instance, between 0 and 600 years CE (Figure b; Perner et al, ) a relatively strong and warm WGC‐induced melting of marine‐based outlet glaciers causing surface freshening and warming (Andresen et al, ; Krawczyk et al, ; Ouellet‐Bernier et al, ; Sha et al, ; Moros et al, ; Krawczyk et al, ; Allan et al, ; Kolling et al, ; Figure ). From ~800 CE the WGC cooled (Perner et al, ; Figure b) in parallel to atmospheric cooling and favored a readvance of the ice sheet margin and major outlet glaciers extended again into the fjords (Moros et al, ).…”

Section: North Atlantic Variability Over the Last 2000 Years: A Proxmentioning

confidence: 99%

“…From ~800 CE the WGC cooled (Perner et al, ; Figure b) in parallel to atmospheric cooling and favored a readvance of the ice sheet margin and major outlet glaciers extended again into the fjords (Moros et al, ). This led to an overall surface cooling and increased sea ice (Krawczyk et al, ; Ouellet‐Bernier et al, ; Sha et al, ; Moros et al, ; Krawczyk et al, ; Allan et al, ; Kolling et al, ; Figures c–6e). However, around 1300 CE, despite the clear cooling in the WGC (Figure 6b; Perner et al, ), the surface records at Disco Bugt show diverging trends in the temperatures and sea ice cover (Krawczyk et al, ; Moros et al, ; Ribeiro et al, ; Seidenkrantz et al, ).…”

Section: North Atlantic Variability Over the Last 2000 Years: A Proxmentioning

confidence: 99%

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Variability in the Northern North Atlantic and Arctic Oceans Across the Last Two Millennia: A Review

Moffa-Sánchez

Moreno-Chamarro

Reynolds

et al. 2019

Paleoceanog and Paleoclimatol

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The climate of the last two millennia was characterized by decadal to multicentennial variations, which were recorded in terrestrial records and had important societal impacts. The cause of these climatic events is still under debate, but changes in the North Atlantic circulation have often been proposed to play an important role. In this review we compile available high‐resolution paleoceanographic data sets from the northern North Atlantic and Nordic Seas. The records are grouped into regions related to modern ocean conditions, and their variability is discussed. We additionally discuss our current knowledge from modeling studies, with a specific focus on the dynamical changes that are not well inferred from the proxy records. An illustration is provided through the analysis of two climate model ensembles and an individual simulation of the last millennium. This review thereby provides an up‐to‐date paleoperspective on the North Atlantic multidecadal to multicentennial ocean variability across the last two millennia.

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“…At the scale of the late Holocene, the high temporal resolution study of Kolling et al [4] presents biomarker data documenting productivity changes in relation to sea ice cover. Short-term oscillations in biomarker fluxes are tentatively associated with modes of variability such as the Atlantic Multidecadal Oscillation.…”

Section: Arctic Palaeoceanography and Sea Icementioning

confidence: 99%

Arctic environmental change beyond instrumental records: introduction and overview

Cofaigh

Kirchner

Fedorov³

et al. 2018

Arktos

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New insights into sea ice changes over the past 2.2 kyr in Disko Bugt, West Greenland

Cited by 14 publications

References 142 publications

Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay

Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay

Variability in the Northern North Atlantic and Arctic Oceans Across the Last Two Millennia: A Review

Arctic environmental change beyond instrumental records: introduction and overview

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