Depth-binned Data from 300 kHz ADCP #2903 on HOME mooring A2

Kevin Bartlett,
last modified September 8, 2004.

The "depth_binned" directory contains ADCP data binned to actual
depths in the water column rather than range to instrument.

Yvonne Firing converted range bins to depth using the Matlab routines
surffind.m, which found the instrument depth using echoes from the
ocean surface, and loadadcp.m, which used linear interpolation to
convert the range/velocity relationship to a depth/velocity
relationship at fixed depth bins.

Where surffind.m was unable to determine the instrument depth using
acoustic returns from the ocean surface, pressure data from an
adjacent SeaBird instrument (in this case, SBE-37 #1771) was used
instead. No use was made of the nominal distance from the ADCP to the
SeaBird instrument on the mooring: an offset was added to the SeaBird
pressure so that it agreed with the acoustic return depth where
acoustic values were available.

Yvonne's variables were placed into a structured variable named
"adcp". The mapping of variable names to fieldnames of the structured
variable is as follows:

  nu                   ==>  adcp.u
  nv                   ==>  adcp.v
  nw                   ==>  adcp.w
  ntime                ==>  adcp.time
  ndep                 ==>  adcp.binDepths
  ninst_depth          ==>  adcp.instrumentDepth
  inst_depth_fill_ind  ==>  adcp.instrumentDepthFromPressureIndex

u, v and w are just the eastward, northward and upward velocities
(m/s) measured by the ADCP. The "time" field gives the time associated
with each measurement, and is in Matlab time format (see "help
datenum" for details). "binDepths" is the depth, in metres, of each
value of u, v and w. "instrumentDepth" is the depth (in metres) of the
ADCP itself. "instrumentDepthFromPressureIndex" is an index to those
points in the vector of instrument depths where acoustic-return depths 
were not available, and pressure data from an adjacent SeaBird
instrument were used instead.

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2004-09-07:

Added new fields "adcp.SN" for serial number of instrument and
"adcp.frequency" for ADCP frequency value.

Kevin Bartlett