Undulations of the Nova Scotia Current

Analysis of infrared images of a surface temperature front off Nova Scotia, taken over a two-week period, reveals horizontal oscillations with a mean wavelength of 50 km and comparable amplitudes. The oscillations travel downstream with the Nova Scotia Current at a rate of 0.06 m s(-1). A comparison is made with a simple model of baroclinic instability, and it is possible that this mechanism could cause the oscillations. However, more definite tests and data are required. These oscillations could contribute significantly to the exchange of water between the inner and outer shelves.