CalCOFI 9504NH CTD Date Processing Notes

Number of station-casts: 61 standard CalCOFI Station; 4 Goericke Extra Casts

Summary: The single set of primary sensors: temp, cond, & O2 worked well this 
cruise and no replacements were required. All sensors were on their second cruise since
being serviced & calibrated. The O2 sensor downcasts do not agree as well as the upcast
near-surface, typical of the YSI O2 sensor. The Sta-average coefficients from the standard
casts were applied to the four extra Goericke casts. Cruise-average corrected values for
these casts may be better.
Agreement with the bottle samples was very good so the r-squares were low on O2s.

Software: DOS Datcnv(Seasoft exe), running in a Windows XP virtual machine on Windows 7.
Additional Seasoft processing done using v7.23.2 SBE Data Processing. Since the no sensors were
changed, only one .xmlcon file was used in the Derive module. 
Fluorometer sensitivity was changed on cast 059 and used for the remainder of the cruise. Two
fluorometer voltage vs bottle chla regressions were plotted. Cast 001-058 and cast 059-061 
were run separately with different chla calibration coefficients. 


Corrections:
Line.sta correction on cast 001 .hdrs were done: 93.26.7 was changed to 93.3 26.7.
Cast 037 was redone because valves were not closed. Cast 37B is the good cast & was relabeled
037. The first cast with bad valves is in the 37A folder. As far as I know, the sensor profiles
are fine but bottle samples were not drawn since their integrity was questionable. 

Data look good but there were a few spikes, particularly in the oxygen. No data flags were
added so refer to CTD vs Bottle plots to isolate these bad data.


JRW 02/27/2022


