Abstract
Abstract In a companion paper, two ocean general circulation models were implemented in order to simulate and intercompare the main features of the North Atlantic circulation: the Atlantic Isopycnic Model (AIM) and the Hadley Centre Bryan-Cox-type ocean model (HC). Starting from the same initial state and using the same mechanical and thermohaline forcing datasets, both models were spun up from rest for 30 years. This paper examines the western boundary currents, meridional heat transport and subtropical gyre ventilation. AIM transports more heat poleward in the subtropics (with peak annual-mean meridional heat transport of 0.63 PW) than HC (which transports up to 0.48 PW), a difference that arises primarily due to surface-poleward and deep-equatorward flows, which are stronger, and at warmer and colder extremes, than in HC. However, HC displays stronger heat transport across the subpolar gyre (with a secondary maximum of 0.36 PW compared to 0.24 PW in AIM), consistent with stronger subpolar gyre heat gai...
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