ADCP data collected during the SAZ-SENSE voyage, January-February 2007

SAZ-SENSE VOYAGE AU0703 ADCP DATA

• The complete ADCP data for cruise au0703 are in the files: au070301.cny (ascii format) a0703dop.mat (matlab format)
• The "on station" ADCP data (specifically, the data for which the ship speed was less than or equal to 0.35 m/s) are in the files: au0703_slow35.cny (ascii format) a0703dop_slow35.mat (matlab format)
• The file bindep.dat shows the water depths (in metres) that correspond to the centre of each vertical bin.
• The data are 30 minute averages. Each 30 minute averaging period starts from the time indicated. (so, e.g., an ensemble with time 120000 is the average from 120000 to 123000).
• ADCP currents are absolute - i.e. ship's motion has been subtracted out.
• Note that the top few bins can have bad data from water dragged along by the ship.
• Beware of data when the ship is underway - it's often suspect.
• Important data quality information can be found in the data report referenced above.
• The figure a0703difship30.eps shows the speed difference between vertical bin 2 and all other bins, where the data have been divided up into different speed classes for ship speed. The apparent vertical shear for bins ~1-10, and below bin ~40, is an error, possibly due to acoustic ringing from an air/water interface in the seachest. Data where ship speed is 0 to 1 m/s does not show this error.