1. CTD pressure bias issue Marshall discovered on May 19:
Pressure offset setting in xmlcon file (version 1-4 and 6) is wrong for CTD Casts 1-18 and 35-70. It causes a pressure bias of ~1.78 db and a depth value bias in the converted files in the converted CTD files as well as the reported depths of the fired bottles in Casts 1-18 and 35-70. The pressure offset setting has been corrected in xmlcon version 7. The depth info in the converted CTD files is corrected by re-converting all CTD files using the version 7 xmlcon file. But the bottle depths the water samplers recorded on their sampling sheets were affected. We could obtain the corrected bottle depths by generating the bottle files (.ros and .btl) using the corrected xmlcon files. According to a conversation with Dennis, the bottle depths from the bottle files created by Olga (instead of the depths recorded on the sheets) will be given to the groups for afterward data analysis. So, this should not create any problem for the data analysis.

2. Marshall recommend to turn the CTD unit on when the CTD is in the air before reaching the water. This way, the system records the atmospheric pressure, which can be used as the reference pressure to examine the pressure bias. This way, each cast is stand-alone and has all the info for post-correction. 

3. Secondary conductivity sensor was changed from SBE4C-3009 to SBE4c-2148 before CTD cast 100 (see Marshall’s note below)
the xmlcon file used for converting the data files has since been changed to version 8.

Notes from Marshall Swartz:
20190517-post stn 37 notes. M.Swartz @0558Z
Checked bottle 13 for leaks. No issues found when testing closed bottle half full. Opened petcock and after minor drainage, it held remaining water.
I requested SURVEY and watch-standers to cock bottom end-caps to the right of the petcock.
Also to let me know of any issues that come up with bottles or other rosette or ctd related matters.\
Updated PSA on  desktop to version "SBE09_0383_20190517-ver6.xmlcon". This includes the updated SUNA coefficients requested by Heidi
based on May 14 on-cruise SUNA data by her.

On Stn 42:
bottle 2 noted to have top end-cap stuck open until touched.
bottom end-cap closed.
latch had released properly and apparently did not contribute to the hangup.
Why the top end-cap did not fully close is undetermined.

20190523z before stn 100.
secondary conductivity sensor changed before cast 100.
Removed SBE4C-3009
Installed SBE4c-2148
Changed sensor due to cond offset of 0.005 mS/cm during cast.
Updated xmlcon with XML file entry for SBE04-2148.
Updated SEASAVE with PSA file SBE09_0383_20190523.PSA.
Ran Seasave to acquire data on two stations: RB1904-9100.hex and RB1904-9101.hex.
Marshall Swartz