Cristin-resultat-ID: 2020075
Sist endret: 15. juni 2022, 13:29
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Late Weichselian and Holocene behavior of the Greenland Ice Sheet in the Kejser Franz Josef Fjord system, NE Greenland

Bidragsytere:
  • Ingrid Leirvik Olsen
  • Jan Sverre Laberg
  • Matthias Forwick
  • Tom Arne Rydningen og
  • Katrine Husum

Tidsskrift

Quaternary Science Reviews
ISSN 0277-3791
e-ISSN 1873-457X
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Publisert online: 2022
Volum: 284
Artikkelnummer: 107504
Open Access

Importkilder

Scopus-ID: 2-s2.0-85128199304

Klassifisering

Vitenskapsdisipliner

Marin geologi • Sedimentologi • Andre geofag

Emneord

Innlandsiser • Grønland

Beskrivelse Beskrivelse

Tittel

Late Weichselian and Holocene behavior of the Greenland Ice Sheet in the Kejser Franz Josef Fjord system, NE Greenland

Sammendrag

To better understand the past retreat patterns and chronologies of major marine-terminating outlet glaciers, the Late Weichselian and Holocene glacial history of a NE Greenland fjord system is reconstructed using new and previously published swath bathymetry and high-resolution seismic data, supplemented with multi-proxy analysis of sediment cores. The investigated area extends more than 190 km, including Fosters Bugt, Kejser Franz Josef Fjord, Nordfjord and Moskusoksefjord, the drainage routes for Waltershausen Gletscher, one of the largest outlet glaciers in the NE sector of the Greenland Ice Sheet. A complex of moraine ridges identified in Fosters Bugt show former stillstand positions during this period, and, alongside radiocarbon ages, supports the theory of a maximum ice front position in the outer coastal areas during the Younger Dryas-Preboreal period. The retreat moraines distributed within the Kejser Franz Josef Fjord system provide evidence of a stepwise retreat during the last deglaciation, whereby rapid retreat was interrupted by episodes of stillstands and/or readvances of the grounding line. The fjord system was mostly deglaciated prior to 7.8 ka cal BP, with an estimated average retreat rate ranging between 33 and 96 m a−1 since the Younger Dryas. Following this, only minor ice advances in the inner fjords have been identified. The sediment supply from Waltershausen Gletscher dominated the Kejser Franz Josef Fjord, Nordfjord and outer Moskusoksefjord throughout the Holocene period, whereas in the middle and inner Moskusoksefjord the sediment deposits reflect a more local catchment area. The estimated average retreat rate is in the same order of magnitude as the rates from fjords of northern Fennoscandia, indicating the same overall control for the deglaciation, ice melting from increased Northern Hemisphere summer insolation that peaked in Early Holocene

Bidragsytere

Aktiv cristin-person

Ingrid Leirvik Olsen

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Jan Sverre Laberg

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Matthias Forwick

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Tom Arne Rydningen

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Katrine Husum

  • Tilknyttet:
    Forfatter
    ved Forskningsavdelingen ved Norsk Polarinstitutt
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