High frequency acoustic observations of episodic mixing events in Lunenburg Bay
Keywords:Backscattering, Frequencies, Speed control, Wind, Acoustic current profilers, High frequency backscatter, Wind speed measurements
AbstractHigh frequency backscatter observations recorded through acoustic current profilers and velocimeters at three locations within the Lunenberg Bay were analyzed. It was found that six periods of enhanced surface-intensified backscatter and three periods of enhanced scattering near the bottom occurred between 260-290 days. Local sheltering of wind and waves resulted in distinct data sets from each location for any given period of enhanced scattering to varying degrees. Wave height estimates were made using the data from the internally recording ADCP, which was equipped with a waves measurement package and calculated a spectrum every half hour, using 20 minutes of data sampled at 2 Hz. Wind speed measurements were made using a shore based anemometer on a 10m tower, which were reported every hour. The results show that the event at day 272, which was the focus of the preliminary investigations of the periodic events, corresponds to the arrival of Hurricane Juan at Halifax, NS.
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