Episodic Atlantic Water Inflow Into the Independence Fjord System (Eastern North Greenland) During the Holocene and Last Glacial Period

Nieuwenhove, Nicolas Van; Limoges, Audrey; Nørgaard-Pedersen, Niels; Seidenkrantz, Marit‐Solveig; Ribeiro, Sofia

doi:10.3389/feart.2020.565670

Cited by 5 publications

(2 citation statements)

References 50 publications

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“…These observations suggest that P. glacialis is a widely distributed sea ice microalga. However, it is not often reported in microplankton surveys and its cysts have been only sporadically found in surface sediments (47)(48)(49) and in sediment records (50)(51)(52). The reason for this could be difficulties in separating P. glacialis from other small dinoflagellates using standard light microscopy.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary ancient DNA from the sympagic dinoflagellate Polarella glacialis as a sea-ice proxy

Harðardóttir

Haile²,

Ray³

et al. 2023

Preprint

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Sea ice is a critical component of the Earth’s Climate System and a unique habitat. Sea-ice changes prior to the satellite era are poorly documented, and proxy methods are needed to constrain its past variability. Here, we demonstrate the potential of sedimentary ancient DNA from Polarella glacialis, a sea-ice microalga, for tracing past sea-ice conditions. Our observations confirm that this cyst-forming species is common in first-year sea ice and sinking particulate matter following sea-ice melt. Using species-specific primers targeting the nuclear ribosomal ITS1 region, we quantified Polarella glacialis DNA (Pgla-DNA) by digital PCR in marine and fjord surface sediments. Inferred Pgla-DNA gene copy numbers in sediments reflect the spatial variability of recent sea-ice cover, they increase for sites with 20-80% sea-ice concentration and decrease for sites with concentrations > 80%. Furthermore, Pgla-DNA was detected in a sediment core from northern Baffin Bay spanning ca. 12,000 years. Its detection is more efficient following a molecular approach than standard micropaleontological methods. Given that the species inhabits coastal and marine environments in the Arctic and Antarctic, Pgla-DNA has the potential to become a useful tool for circum-polar sea-ice reconstructions both in marine and glaciated fjord environments, where biomarker and microfossil approaches are limited.

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Section: Introductionmentioning

confidence: 99%

Sedimentary ancient DNA from the sympagic dinoflagellate Polarella glacialis as a sea-ice proxy

Harðardóttir

Haile²,

Ray³

et al. 2023

Preprint

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“…The first topographic and geomorphic mapping of the area was conducted in 1988 (Pedersen, 1994). The first marine sediment cores from the surrounding fjord system were collected in 2006 (Nørgaard‐Pedersen et al., 2008), and a subsequent oceanographic and marine geology campaign provided a history of Atlantic water influx to the fjord system since the last glacial period (Van Nieuwenhove et al., 2020). Research in the area has increased since VRS opened, greatly improving access and logistics for field campaigns.…”

Section: Introductionmentioning

confidence: 99%

Permafrost Thermal Dynamics and Cryostratigraphy at Villum Research Station, Station Nord, Eastern North Greenland (81°N)

Strand

Christiansen²,

Gilbert

2022

JGR Earth Surface

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We provide the northernmost permafrost thermal analysis in Greenland through the ground temperature time series (2014–2021) and cryostratigraphy of two 20‐m deep boreholes (SN1 and SN2) at Villum Research Station, Station Nord (81°N). Three sedimentary units are identified in the stratigraphy: glacial, glaciomarine, and beach deposits. These sandy and gravelly deposits are interpreted to comprise a deglaciation and isostatic emergence sequence. Ice‐poor epigenetic permafrost grew downwards into the deposits following subaerial exposure. Relatively high salinity values (up to 70 ppt) are observed in the glaciomarine unit, resulting in freezing point depressions between 0 and −4°C. The Prinsesse Ingeborg Halvø study area has a polar tundra climate and is unique compared to other high Arctic areas because of a thick (>1 m), long‐lasting snow cover. This snow cover results in relatively high permafrost temperatures for the climate and latitude and the warmest known permafrost north of 80°N. Over the seven‐year study period, average 20 m permafrost temperature was −7.87°C at SN1 and −7.06°C at SN2. The warming rate at 20 m depth was 0.07°C/year at SN1 and 0.05°C/year at SN2, rates which are similar to those of other high Arctic sites. Active layer thickness, extrapolated from the temperature measurements, varied between 0.5 and 1.16 m. The interplay between snow dynamics and seasonal air temperature controls ground thermal regime in the study area. Air temperatures during autumn and midwinter, the fastest warming seasons, influence the ground thermal regime through the gradually developing, dense snowpack.

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Upper ocean variability off NE Greenland (79°N) since the last glacial maximum reconstructed from stable isotopes in planktic foraminifer morphotypes

Spielhagen

Mackensen

2021

Quaternary Science Reviews

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Episodic Atlantic Water Inflow Into the Independence Fjord System (Eastern North Greenland) During the Holocene and Last Glacial Period

Cited by 5 publications

References 50 publications

Sedimentary ancient DNA from the sympagic dinoflagellate Polarella glacialis as a sea-ice proxy

Sedimentary ancient DNA from the sympagic dinoflagellate Polarella glacialis as a sea-ice proxy

Permafrost Thermal Dynamics and Cryostratigraphy at Villum Research Station, Station Nord, Eastern North Greenland (81°N)

Upper ocean variability off NE Greenland (79°N) since the last glacial maximum reconstructed from stable isotopes in planktic foraminifer morphotypes

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