This directory contains data from an ocean bottom-moored instrument that 
was collected as part of the Western Boundary Time Series ("WBTS") project.  
The WBTS project is funded by the National Oceanic and Atmospheric 
Administration and is run at the NOAA-Atlantic Oceanographic and 
Meteorological Laboratory.        

Project web page: www.aoml.noaa.gov/phod/wbts/

Project contact:
  Dr. Christopher Meinen
  NOAA-Atlantic Oceanographic and Meteorological Laboratory
  4301 Rickenbacker Cswy
  Miami, FL 33149
  Phone: 305-361-4355
  Email: Christopher.Meinen at noaa.gov

The WBTS project collects data with two types of ocean bottom-moored 
instruments: 

  - PIES -
      Pressure-equipped inverted echo sounder

  - CPIES - 
      Current and pressure-equipped inverted echo sounder


Both PIES and CPIES make the following measurements: 

 - Round trip acoustic travel time ("tau") - 
      The time required for a 12kHz sound pulse transmitted by the 
      instrument to travel from the bottom-moored location up to the 
      sea surface, reflect, and return to be heard by the instrument.  

 - Bottom pressure - 
      The ambient pressure measured at the instrument.  

A CPIES also measures the following: 

 - Near-bottom currents - 
      The zonal and meridional water velocity at a point approximately 
      50 meters above the ocean bottom above the instrument.  


This directory contains the processed and quality controlled data from 
a single PIES or CPIES mooring that has been recovered after deployment 
as part of the WBTS project.  The processed data is included here as an 
ASCII formatted file; data have been subsampled to one value per day 
(noon GMT) as part of the standard processing.  Processed pressure is 
the anomaly after removing the record-length time mean; tides have also 
been removed.  Travel time has been calibrated to a constant common 
pressure surface; for the WBTS project, all travel times have been 
calibrated using concurrent CTD profiles into the equivalent travel 
time that would be measured at 1000 decibars.  Also included is a 
subdirectory containing the original ("raw") data collected by the 
instrument in case a user wishes to process it in a different manner.  

More information about the WBTS project, the processing of PIES/CPIES 
data, and the science involved in the WBTS project, please see the 
following scientific article and other references therein.  

Meinen, C.S., W.E. Johns, S.L. Garzoli, E. Van Sebille, D. Rayner, 
T. Kanzow, and M.O. Baringer, Variability of the Deep Western Boundary 
Current at 26.5°N during 2004-2009, Deep-Sea Res. Part II, 85:154-168, 
doi:10.1016/j.dsr2.2012.07.036, 2012.  

