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A daily profile (weather permitting) of the Conductivity, Temperature, and Depth (CTD) is collected at the end of the FRF pier by using an Ocean Sensor's CTD gage (OS200). The instrument measures conductivity, temperature, and depth. From these parameters, salinity, density, and the speed of sound are computed based on the UNESCO 83 standards.

The CTD data directory contains ASCII data files and plots.
The file names indicate YYYY MM DD HHmm (Eastern Standard Time).

   CTD FILES 
sample ascii file:

CHL-FRF       CTD PROFILE: EOP 
200701310720     31 JAN 2007    0720 EST 

Cond   Temp    Press  Sal    SSP    Sigma-T 
28.820 6.530   1.152 28.356 1467.86 22.2800
28.848 6.551   1.809 28.369 1467.97 22.2874
28.924 6.597   2.263 28.413 1468.22 22.3164
28.954 6.619   2.686 28.427 1468.33 22.3247
etc.


Column definitions
  1. Cond:  conductivity (mS/cm)
  2. Temp:  temperature (C)
  3. Press: Depth(m) from surface. 
            Tide not considered.
  4. Sal:   salinity (ppt)
  5. SSP:   sound speed (m/s)
  6. Sigma-T: Water density () g/cm³
      = (-1) * 10³
     If density =1.02354 then  =23.54