Cristin-prosjekt-ID: 489200
Sist endret: 19. oktober 2017 18:34
Cristin-prosjekt-ID: 489200
Sist endret: 19. oktober 2017 18:34
Prosjekt

Ocean Controls onhigh-latitude Climate sensitivity - a Pliocene case study

prosjektleder

Bjørg Risebrobakken
ved Uni Research Klima ved NORCE Norwegian Research Centre AS

prosjekteier / koordinerende forskningsansvarlig enhet

  • Uni Research Klima ved NORCE Norwegian Research Centre AS

Finansiering

  • Norges forskningsråd

    • Prosjektkode: 221712

Klassifisering

Vitenskapsdisipliner

Geofag

Kategorier

Prosjektkategori

  • Grunnforskning

Kontaktinformasjon

Telefon
93002873
Sted
Erik Sandquist

Tidsramme

Avsluttet
Start: 15. august 2013 Slutt: 14. august 2017

Beskrivelse Beskrivelse

Tittel

Ocean Controls onhigh-latitude Climate sensitivity - a Pliocene case study

Vitenskapelig sammendrag

The Pliocene Epoch (5.3-2.6 million years ago) is a warm period of particular interest, when boundary conditions of the climate system were similar to the present, but sea level was higher and today’s polar and subpolar regions were as warm as or warmer than predicted in future scenarios. High northern latitudes are thought to have been especially warm; however, how these warm, high-latitude conditions were maintained is an open question, in part given the apparently contradictory observational evidence in the Nordic Seas.

The Nordic Seas link the North Atlantic and Arctic Oceans, and is a small but dynamically important part of the global ocean. In today’s climate, they form a region of strong atmosphere-ocean exchange, vigorous mixing of water masses and deep convection. The Nordic Seas offer a unique opportunity to study the exchange of salt, heat and mass between the North Atlantic and Arctic oceans in situations with a warmer climate than at present. OCCP aims to resolve conflicting views on the role of the Nordic Seas in determining high northern latitude climate and the degree of Arctic amplification during a key warm period in Earth’s history, the Pliocene. We will adopt a multidisciplinary approach. New, multi-proxy data characterizing the Nordic Seas water column during the Pliocene will be generated and combined with published data from the North Atlantic/Arctic region. The reconstructions will be combined with results from model experiments designed to investigate the large-scale dynamics of the region. The model results will be used to identify key processes responsible for the observed high latitude climate of the Pliocene and the role of the Nordic Seas “gateway” between the North Atlantic and Arctic. This approach will enable us to make substantial progress towards understanding the mechanisms behind the apparent high sensitivity of the Arctic in warm climates, the role of the Nordic Seas in the arctic amplification of Pliocene warming, and will ultimately help constrain the long-term sensitivity of the climate system in a warming world.

The guiding hypotheses to be tested in this project are whether:

  • the ocean circulation and northern limb of the AMOC may operate differently from today under climatic boundary conditions close to modern.
  • prior estimates of Pliocene oceanic warmth and oceanic heat advection towards the Arctic are overestimated, and earlier estimates of Pliocene Arctic amplification may have been too high.

prosjektdeltakere

prosjektleder

Bjørg Risebrobakken

  • Tilknyttet:
    Prosjektleder
    ved Uni Research Klima ved NORCE Norwegian Research Centre AS

Contoux Camille

  • Tilknyttet:
    Prosjektdeltaker
    ved Uni Research Klima ved NORCE Norwegian Research Centre AS

Gilles Ramstein

  • Tilknyttet:
    Prosjektdeltaker
    ved Laboratoire des Sciences du Climat et de l'Environnement

Kerim Hestnes Nisancioglu

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

Camille Li

  • Tilknyttet:
    Prosjektdeltaker
    ved Geofysisk institutt ved Universitetet i Bergen
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Resultater Resultater

Exploring the MIS M2 glaciation occurring during a warm and high atmospheric CO2 Pliocene background climate.

Tan, Ning; Ramstein, Gilles; Dunas, Christophe; Contoux, Camille; Ladant, Jean-Baptiste; Sepulchre, Pierre; Zhang, Zhongshi; De Schepper, Stijn. 2017, Earth and Planetary Science Letters. NORCE, CNRS, CUG, NZC, LSCEVitenskapelig artikkel

Norwegian Atlantic Current variability and changes in heat transport to the Arctic during the mid-Piacenzian.

Panitz, Sina; De Schepper, Stijn; Salzman, Ulrich; Bachem, Paul Eduard; Risebrobakken, Bjørg; Hocking, E. 2016, XIV International Palynology Congress . UoNaN, NORCEVitenskapelig foredrag

Highly variable Pliocene sea surface conditions in the Norwegian Sea.

Bachem, Paul Eduard; Risebrobakken, Bjørg; De Schepper, Stijn; McClymont, Erin L.. 2017, Climate of the Past. NORCE, UoDVitenskapelig artikkel

Nordic Seas Circulation during the Pliocene.

Risebrobakken, Bjørg. 2017, Joint CEED/BCCR workshop on the Climate of the past 50 million years: "from greenhouse to icehouse". NORCEVitenskapelig foredrag

Past warm climate changes at high northern latitudes (and a brief introduction to paleoactivities and resources in Bergen).

Risebrobakken, Bjørg. 2017, China-Norway Paleoclimate Workshop. NORCEVitenskapelig foredrag
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