Drivers of uncertainty in simulated ocean circulation and heat uptake

Markus B. Huber, Laure Zanna

Research output: Contribution to journalArticle

Abstract

The impact of uncertainties in air-sea fluxes and ocean model parameters on the ocean circulation and ocean heat uptake (OHU) is assessed in a novel modeling framework. We use an ocean-only model forced with the simulated sea surface fields of the CMIP5 climate models. The simulations are performed using control and 1% CO2 warming scenarios. The ocean-only ensemble adequately reproduces the mean Atlantic Meridional Overturning Circulation (AMOC) and the zonally integrated OHU. The ensemble spread in AMOC strength, its weakening, and Atlantic OHU due to different air-sea fluxes is twice as large as the uncertainty range related to vertical and mesocale eddy diffusivities. The sensitivity of OHU to uncertainties in air-sea fluxes and model parameters differs vastly across basins, with the Southern Ocean exhibiting strong sensitivity to air-sea fluxes and model parameters. This study clearly demonstrates that model biases in air-sea fluxes are one of the key sources of uncertainty in climate simulations.

Original languageEnglish (US)
Pages (from-to)1402-1413
Number of pages12
JournalGeophysical Research Letters
Volume44
Issue number3
DOIs
StatePublished - Feb 16 2017

Keywords

  • air-sea fluxes
  • climate models
  • ocean circulation
  • ocean heat uptake
  • uncertainty quantification

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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