Submitted as: development and technical paper 09 Nov 2020
Submitted as: development and technical paper | 09 Nov 2020
Sensitivity of Northern Hemisphere climate to ice-ocean interface heat flux parameterizations
- 1Alfred Wegener Institute, Helmholtz center for Polar and Marine Research, Bremerhaven, Germany
- 2Institute for Oceanography, Center for Earth System Research and Sustainability (CEN), Hamburg University, Hamburg, Germany
- 3Max Planck Institute for Meteorology, Hamburg, Germany
- 4Department of Atmospheric and Environmental Sciences, University at Albany, New York, USA
- 1Alfred Wegener Institute, Helmholtz center for Polar and Marine Research, Bremerhaven, Germany
- 2Institute for Oceanography, Center for Earth System Research and Sustainability (CEN), Hamburg University, Hamburg, Germany
- 3Max Planck Institute for Meteorology, Hamburg, Germany
- 4Department of Atmospheric and Environmental Sciences, University at Albany, New York, USA
Abstract. We investigate the impact of three different parameterizations of ice-ocean heat exchange on modeled ice thickness, ice concentration, and water masses. These three parameterizations are (1) an ice-bath assumption with the ocean temperature fixed at the freezing temperature, (2) a turbulent heat-flux parameterization with ice-ocean heat exchange depending linearly on the temperature difference between the mixed layer and the ice-ocean interface, and (3) a similar turbulent heat-flux parameterization as (2) but with the temperature at the ice-ocean interface depending on ice-ablation rate. Based on model simulations with the standalone sea-ice model CICE, the ice-ocean model MPIOM and the climate model COSMOS, we find that (3) leads (in comparison to the other two parameterizations) to a thicker modeled sea ice, warmer water beneath high-concentration ice and cooler water towards the ice edge, and higher salinity in the Arctic Ocean mixed layer. Finally, in the fully coupled climate model COSMOS, the most realistic parameterization leads to an enhanced Atlantic meridional overturning circulation (AMOC), a more positive North Atlantic Oscillation (NAO) mode and a weakened Aleutian Low.
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Xiaoxu Shi et al.
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RC1: 'See attached review.', Bruno Tremblay, 28 Dec 2020
Xiaoxu Shi et al.
Data sets
ice-ocean-heat-flux snapshot Xiaoxu Shi https://doi.org/10.5281/zenodo.4160368
Model code and software
ice-ocean-heat-flux snapshot Xiaoxu Shi https://doi.org/10.5281/zenodo.4160368
Xiaoxu Shi et al.
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