CalCOFI 9501JD CTD Date Processing Notes

Number of station-casts: 66 standard CalCOFI Station; 1 Goericke Extra Cast 646

Summary: The single set of primary sensors: temp, cond, & O2 worked well this 
cruise and no replacements were required. All sensors were on their first 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 cruise-average coefficients from the standard
casts were applied to the extra Goericke cast & plotted.
Agreement with the bottle samples was very good so the r-squares were low on O2s. There
were issues with cast 031, perhaps biofouling on the downcast since the upcast improved.
All oxygen sensor data on 031 downcast were bad. The upcast data look better although
not initially agreeing well at 515m. Then between 320-230, both O2 & Salinity data look
questionable. These data were flagged accordingly.

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 to 1x on casts 028-30 then set back to 3x for the remainder of the cruise. Two
fluorometer voltage vs bottle chla regressions were plotted. Cast 001-027 + 031-66 and cast 028-030 
were run separately with different chla calibration coefficients. 


Corrections:
No Line.sta corrections were needed.
A couple casts were interrupted and data files needed to be appended: 18, 56, 646.
Cast 063 was redone after reterminating.


JRW 03/09/2022


