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Long-term Oceanographic Observations in Western Massachusetts Bay, Offshore of Boston
U.S. Geological Survey Digital Data Series DDS-74, Version 2.0

Currents Sorted by Speed and Direction

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Hour-averaged and low-passed current observations were sorted into speed and direction bins to provide a measure of the most frequent current speeds and directions. The current measurements are sorted into bins defined by 2 cm/s speed intervals and 20 degree direction intervals. To produce each of tables, the hour-averaged current records of a given depth were sorted into speed/direction bins bounded by the speed values along the left side of the table and the direction values along the top of the table. For example, the upper left bin would contain all currents of speeds less than 2 cm/s flowing toward compass directions between 0 and 20 degrees measured clockwise from north. For each bin, the table lists the percentage of the data values that lie within that bin. The numbers in the far right column are the percent occurrence in each speed interval, summed across all directions. The numbers in the bottom-most row are the percent occurrence in each direction interval, summed across all speeds. The Total Points Sorted and the Percentage of Possible Observations (calculated as total points sorted divided by the number of hours in the year) at the bottom of the sort figures indicate the data coverage for each year sorted. During some periods, two instruments were simultaneously in the water at the same Site; this situation typically occurred for short periods when an existing mooring was not recovered (usually due to operational issues) prior to deploying a replacement. In these cases, data for both instruments are included in the sort and the Percentage of Possible Observations may exceed 100%.

Site A, Point Current Meter
Hourly Averaged 5 mbs 10 mab 1 mab          
Low-Passed 5 mbs 10 mab 1 mab          

Site A, ADCP
Hourly Averaged 5 mbs 15 mbs Deepest Bin
Low-Passed 5 mbs 15 mbs Deepest Bin

Site B, ADCP
Hourly Averaged 5 mbs 10 mbs Deepest Bin
Low-Passed 5 mbs 10 mbs Deepest Bin

*Table containing a list of the depth of the deepest ADCP bin for each deployment.

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