Vertical Acoustic Travel Time (VATT)

The VATT varies principally due to changes in the temperature profile of the water column. Applications in several large scale ocean currents and frontal zones have demonstrated that VATT can be re-interpreted as geopotential height (dynamic height), which varies due to current meandering and eddies. The IES is well-suited to monitor changes in temperature structure and dynamic height. In many regions the vertical profiles of geopotential height, which vary with time, may be determined from VATT measurements. Data from laterally separated IESs can estimate horizontal gradients in dynamic height, from which geostrophic ocean current profiles may be calculated.

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