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Distributions of temperature (T ) and salinity (S) and their relationship in the oceans are the result of a balance between T-S variability generated at the surface by air-sea fluxes and its removal by molecular dissipation. In this paper the role of different motions in setting the cascade of T-S variance to dissipation scales is quantified using data from the North Atlantic Tracer Release Experiment (NATRE). The NATRE observational programs include fine- and microscale measurements and provide a snapshot of T-S vari- ability across a wide range of scales from basin to molecular. It is found that microscale turbulence controls the rate of thermal dissipation in the thermocline. At this level the T-S relation is established through a balance between large-scale advection by the gyre circulation and small-scale turbulence. Further down, at the level of intermediate and Mediterranean waters, mesoscale eddies are the rate-controlling process. The transition between the two regimes is related to the presence of a strong salinity gradient along density surfaces associated with the outflow of Mediterranean waters. Mesoscale eddies stir this gradient and produce a rich filamentation and salinity-compensated temperature inversions: isopycnal stirring and di- apycnal mixing are both required to explain the T-S relation at depth.

Finescale Structure of the T–S Relation in the Eastern North Atlantic