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Mesoscale ocean features, such as eddies and frontal meanders, have temporal and spatial scales that are poorly resolved by conventional surveying methods such as moorings and CTD casts. Towed instruments provide a method of measuring oceanographic data with a medium spatiotemporal resolution. The separation of sample points is restricted by the towing speed of the instrument and the survey design. The compromise between imaging large-scale and mesoscale features in towed surveys often means that the mesocale components are only just resolved by the cross-track sample spacing. In the analysis of the data, the evolution of the system during the survey period is often ignored, and it is assumed that the measurements are synoptic. A simple isopycnal model is used to examine the errors that arise as a result of this assumption for a typical towed survey consisting of a series of quasi-parallel tracks measured perpendicular to the mean flow. The temporal changes in the model lead to a 40%–50% increase...

The Impact of Nonsynoptic Sampling on Mesoscale Oceanographic Surveys with Towed Instruments