Cristin-resultat-ID: 1760187
Sist endret: 12. desember 2019 15:51
Resultat
Vitenskapelig foredrag
2019

Dynamical sequence of ocean, atmosphere, and sea ice changes during an abrupt stadial-to-interstadial climate transition

Bidragsytere:
  • Chuncheng Guo
  • Kerim Hestnes Nisancioglu
  • Henrik Sadatzki
  • Trond Martin Dokken og
  • Eystein Jansen

Presentasjon

Navn på arrangementet: American Geophysical Union (AGU)
Sted: San Francisco
Dato fra: 9. desember 2019
Dato til: 13. desember 2019

Arrangør:

Arrangørnavn: AGU

Om resultatet

Vitenskapelig foredrag
Publiseringsår: 2019

Beskrivelse Beskrivelse

Tittel

Dynamical sequence of ocean, atmosphere, and sea ice changes during an abrupt stadial-to-interstadial climate transition

Sammendrag

Marine Isotope Stage 3 (about 60 to 30 ka BP) was punctuated by abrupt climate transitions between colder stadial and warmer interstadial climate states. The fluctuations are known as Dansgaard–Oeschger events, and are featured by a rapid warming from stadial to interstadial in several decades as recorded by the Greenland ice cores, followed by gradual return to stadial conditions. Using a state-of-the-art climate model, the Norwegian Earth System Model configured for fast paleoclimate simulations with a two-degree atmosphere and one-degree ocean, we investigate the transient response of the atmosphere/ocean/sea ice processes from a stadial to interstadial climate state. The stadial state is achieved by applying freshwater forcing to a Marine Isotope Stage 3 control simulation. With support from a high-resolution marine sediment core in the Nordic Seas (MD99-2284), we addressed the key role played by sea ice in modulating the Greenland temperature change at the transition, and identify a sequence of changes in the ocean and its interactions with sea ice and the atmosphere. We found that the recovery of open ocean deep convection is asynchronous in the North Atlantic region, and in agreement with proxy reconstructions, changes in the ocean (e.g. AMOC) precede melting of sea ice in the Nordic Seas, with the latter process occurring simultaneously with rapid changes in Greenland temperature.

Bidragsytere

Chuncheng Guo

  • Tilknyttet:
    Forfatter
    ved NORCE Klima ved NORCE Norwegian Research Centre AS

Kerim Hestnes Nisancioglu

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen

Henrik Sadatzki

  • Tilknyttet:
    Forfatter

Trond Martin Dokken

  • Tilknyttet:
    Forfatter
    ved NORCE Klima ved NORCE Norwegian Research Centre AS

Eystein Jansen

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen
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