Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.174 IF 3.174
  • IF 5-year value: 3.841 IF 5-year 3.841
  • CiteScore value: 3.48 CiteScore 3.48
  • SNIP value: 1.078 SNIP 1.078
  • SJR value: 1.981 SJR 1.981
  • IPP value: 3.38 IPP 3.38
  • h5-index value: 42 h5-index 42
  • Scimago H index value: 58 Scimago H index 58
Discussion papers
https://doi.org/10.5194/cp-2018-165
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2018-165
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Dec 2018

Research article | 03 Dec 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Equilibrium simulations of Marine Isotope Stage 3 climate

Chuncheng Guo1, Kerim H. Nisancioglu2,3, Mats Bentsen1, Ingo Bethke1, and Zhongshi Zhang1 Chuncheng Guo et al.
  • 1NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
  • 2Department of Earth Science, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
  • 3Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, Norway

Abstract. An equilibrium simulation of Marine Isotope Stage 3 (MIS3) climate with boundary conditions characteristic of Greenland Interstadial 8 (GI-8; 38kaBP) is carried out with the Norwegian Earth System Model (NorESM). A computationally efficient configuration of the model enables long integrations at relatively high resolution, with the simulations reaching a quasi-equilibrium state after 2500 years. We assess the characteristics of the simulated large-scale atmosphere and ocean circulation, precipitation, ocean hydrography, sea ice distribution, and internal variability. The simulated MIS3 interstadial near surface air temperature is 2.9°C cooler than the pre-industrial (PI). The Atlantic Meridional Overturning Circulation (AMOC) is deeper and intensified (by ~13%). There is a decrease in the volume of Antarctic Bottom Water (AABW) reaching the Atlantic. However, there is an increase in ventilation of the Southern Ocean, associated with a significant expansion of Antarctic sea ice and intensified brine rejection, invigorating ocean convection. In the central Arctic, sea ice is ~2m thicker, with an expansion of sea ice in the Nordic Seas during winter. Simulated MIS3 inter-annual variability of the El Niño-Southern Oscillation (ENSO) and the Arctic Oscillation are weaker compared to the pre-industrial. Attempts at triggering a non-linear transition to a cold stadial climate state by varying atmospheric CO2 concentrations and Laurentide Ice Sheet height, suggest that the simulated MIS3 interstadial state in the NorESM is relatively stable, thus questioning the potential for unforced abrupt transitions in Greenland climate during the last glacial.

Chuncheng Guo et al.
Interactive discussion
Status: open (until 28 Jan 2019)
Status: open (until 28 Jan 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Chuncheng Guo et al.
Chuncheng Guo et al.
Viewed  
Total article views: 210 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
162 45 3 210 1 1
  • HTML: 162
  • PDF: 45
  • XML: 3
  • Total: 210
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 03 Dec 2018)
Cumulative views and downloads (calculated since 03 Dec 2018)
Viewed (geographical distribution)  
Total article views: 189 (including HTML, PDF, and XML) Thereof 187 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 10 Dec 2018
Publications Copernicus
Download
Short summary
We present an equilibrium simulation of the climate of Marine Isotope Stage 3, with an IPCC-class model with a relatively high model resolution and a long integration. The simulated climate resembles a warm interstadial state, as indicated by reconstructions of Greenland temperature, sea ice extent, and AMOC. Sensitivity experiments to changes in atmospheric CO2 levels and ice sheet size show that the model is in a relatively stable climate state without multiple equilibria.
We present an equilibrium simulation of the climate of Marine Isotope Stage 3, with an...
Citation
Share