NOTE for underway data: A second Fluorometer was used, a Wetstar and
is under the SCI3 column in the underway data files.
Also, the underway conductivity is suspect - after the cruise
Linda took out the sensor and said it was very slimy!

                W0309B                 
 Stations 4,29,37: Use primary sensor pair with correction:
    Ccorr = C * 1.00026381
 All other Stations: Use secondary pair with correction:
    Ccorr = C * 0.999902487

Use ~/lib/binav2c2.w0309b.[s2.]f for *c files. 
Data has tr, fl, ox. Transmissometer has a correction,
See further notes about processing in w0309b/sbe/CTDnotes.TXT.
Oxygen has a correction in the SeaBird configuration file:
 SOC and Voffset were recomputed using the Winkler sample 
 results. Alignctd used a 12 second delay for oxygen, which
 was determined by looking at stations 9 and 20 up and down 
 casts.
 NOTE: Oxygen is "missing" from more depths at the bottom of the 
       casts because of the 12 second delay with respect to pressure.

c ---  Trans = SN-CST-590DR, factory cal 01 May 02
c ---   Aircals were done. 
        Note this transmissometer 
        uses a different formula to determine % light transmission.
        Used SeaBird's recommended method to determing slope and
        offset values for transmissometer. (Application Note #07, Aug.01rev.)
      New zero (Vdnew) = 0.05495V, new air (Vairnew) = 4.8059V
      M = (91.3/Vref) * (Vair - Vd)/(Vairnew - Vdnew)
      M = (91.3/4.771) * (4.891 - 0.058)/(4.8059-0.05495)
      B = -M * Vdnew
      trn = (19.467 * trn) - 1.0697

Oct 13, 2003
 
w0309b CTD Calibration

    During cruise w0309b a total of 39 CTD stations were completed, 
with CTD #2843. The pressure sensor, s/n 86527, was calibrated 
on July 17, 2001. Stations were completed along the Newport, Five Mile,
Crescent City, and Heceta Head Hydro lines
(NH-1 to NH-85, on 26-27 September, CR-1 to CR-11 on 28-29 September, FM-1 to FM-9
on 29-30 September, and HH-1 to HH-9 on 30 September - 1 October), 
with a maximum sampling depth of 1005m. NH-15 was done twice, once while waiting
for darkness.
  
   The seabird CTD was attached to a rosette and at most 
stations 12 5-liter Niskin bottles were fired. Most of the bottles 
were for Pat Wheeler's biological analysis  with 1 bottle 
reserved specifically for the ctd calibration. At most stations 1 
or 2 of the biologist's sample depths also coincided with a 
reasonable mixed area for a salinity sample, and duplicate 
salt samples were drawn from 1-3 Niskin bottles at each station. 
All of the salinity samples were run on the Portasal (#5) on board. 
7 (for S1) and 8 (for S2) points were 
edited out that had large differences (>2 std. dev.)
A final comparison of the bottle and CTD conductivity was made.
  The results of the run were as follows:

 Bottle salinity - CTD PRIMARY sensor pair (T0=1366, C0=2356
                                        Cal:17Dec02,17Dec02)
 
 All means and std. dev. are in mmhos/cm2.

First Run:
      N       Mean      Std Dev     Mean    Std Dev
               C0         C0         S0       S0
     84      0.013       0.031      0.014    0.036
After editing out 4 points:
      N       Mean      Std Dev     Mean    Std Dev
               C0         C0         S0       S0
     77      0.009       0.003      0.010    0.003

 Bottle salinity - CTD SECONDARY sensor pair (T1=1371,C1=1030
                                        Cal:17Dec02, 8Jul03)

First Run: 
      N       Mean      Std Dev     Mean    Std Dev
               C1         C1         S1       S1
     84      0.001       0.025      0.001    0.027
After editing out 1 point:
      N       Mean      Std Dev     Mean    Std Dev
               C1         C1         S1       S1
     76     -0.003       0.002     -0.004    0.002


CONCLUSION: Results of the comparison between in situ sample data and 
the CTD output are summarized above. The sample conductivity was 
calculated using the CTD  temperature and sample salinity. The analysis 
of the w0309b sample and CTD conductivity differences showed 
corrections were needed for both sensor pairs. The conductivity 
differences had means of 0.004 (primary sensor), and 0.010 
(secondary sensor); and standard deviations of 0.002 and 0.002 
respectively. 
  The primary sensor pair correction is: 
   Ccorr = C * 1.00026381
  and the secondary pair correction is:
   Ccorr = C * 0.999902487
     The primary sensor pair was the sensor pair used for 
final processing for all casts.
