Andrew Winkelman
 NOAA/GLERL
 2205 Commonwealth Blvd.
 Ann Arbor, MI  48105-2945
 Phone:    (734) 741-2336
 Fax:      (734) 741-2055
 e-mail:   andy.winkelman@noaa.gov

CTD casts were taken with a Sea-Bird Electronics CTD Profiler (model # SBE 9) Sea-Bird 
Electronics, Inc. Bellevue, WA.  The profiler samples its sensors at a programmable 
rate up to 24 hertz, providing the ability to characterize the water column with high 
accuracy, resolution, and fine-scale measurement performance.  Depth bins of 1m were 
used to smooth out the data.



Profiler Specifications:
                                 Range                 Accuracy            Resolution
Depth (meters)                 up to 6800             +/- 0.25%              0.015%
Temperature (deg C)            -5 to +35              +/- 0.002              0.0003
Oxygen (mg/L)                   0 to 24               +/- 0.1                0.01
Conductivity (S/m)              0 to 7                +/- 0.0003             0.00004
Par (uE/s/m2)            0 to ~2000 (Full sunlight)   +/- 5.0%               0.00001
pH                              0 to 14               +/- 0.1                  NA



Transmissometry was measured using the in situ transmissometer  (Output is 0 - 5 Volts, 
5 Volts = 0/m, 0 Volts =  55.262/m).  Total suspended matter (TSM) is derived from 
transmissometry output of beam attenuation coefficient (Atten).  Regressions developed 
by A. Winkelman (GLERL) using water samples and CTD transmissometry from surv-1998-068 
and sed-1998-114 cruises for 1998, and surv-2000-100 for 2000:

    For 1998:
    TSM (mg/l) = (1.75) * Atten - 0.21
    N = 52, r^2 = 0.96

    For 2000:
    TSM (mg/L) = (1.66) * Atten - 0.10
    N = 55, r^2 = 0.99