Abstract
Abstract The authors investigate the sensitivity of the thermohaline circulation (THC) with respect to a subpolar salinity perturbation. Such perturbation simulates a freshwater release caused by retreating glaciers or anomalous sea ice. The feedback mechanisms amplifying or damping the initial anomaly are analyzed in the coupled ocean–atmosphere–sea ice model. Their understanding is essential for modeling climate variability on decadal and longer timescales. A 3D ocean circulation model is coupled to an atmospheric energy balance and a thermodynamic sea ice model. The perturbation in the North Atlantic’s subpolar salinity causes a cessation of deep convection and a climate state with decreased oceanic heat transport, decreased high-latitude atmospheric temperature, and larger sea ice extent. The sea ice isolates the atmosphere from the warmer ocean, reducing the heat flux and thus the vertical mixing in the ocean. This change in the local buoyancy flux weakens the large-scale circulation. High-latitude c...
Published Version
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