Abstract
Near-surface current measurements made in the JASIN '72 (Joint Air-Sea Interaction) experiment have been intercompared. There is close agreement between the measurements of a 10-m VACM (Vector averaging current meter) under a toroid moored in 2500 m of water and of 12-m drifters tracked from a ship: differences were only 2 cm s −1 in currents ranging from 10 to 30 cm s −1. Comparisons of the 10-m VACM and a 12-m Aanderaa meter revealed that the Aanderaa vane failed to follow the frequent reversals associated with the surface gravity wave field and hence the instrument biased currents high (by factors of between 1 and 10). A model demonstrated this failing: it is suggested that VACM measurements also bias high (by 10%) but no sure evidence could be found.
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