Ocean Carbon and Biogeochemistry: Data System

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MedFlux cruise: EN416 April 2006
Niskin bottle data processing notes

PI: Cindy Lee (SUNY Stony Brook)

07 March 2007: Prepared for OCB data system by Terry McKee (PO Dept, WHOI) and Cyndy Chandler, OCB DMO (WHOI).

CTD station data were processed using the standard set of Seabird utilities, to generate the CTD station *.btl files, and the final base Niskin bottle sample data file was created using a perl script to reformat the .btl data.

Final CTD station header record showing history of CTD processing steps during which *.btl files were created:
EN416_ctd020_hdr.txt

Final Niskin bottle file header record from .btl file:
EN416_ctd020_btl_hdr.txt

Station location is from NMEA latitude and longitude recorded in CTD station header record at acquisition time. A total of 24 bottles were fired on most, but not all stations (less than 24 bottles fired for stations 3, 8, 14 and 19); and for station 19 (only 5 bottles fired), there is no downtrace CTD profile data either.

Note regarding CTD stations 18 and 19: (no downtrace data reported)
This comment was recorded in the CTDCastLogandInfo416.xls file (PDF version):

Station 18: "HPSS cast. Trip HPBottles then wait for 10min before ascending. FGP P0 = V6 went from 0 to ~0.77 at ~1300m to 2400m downcast then to 2.2 when tripped at 2400m. V6 decreased during upcast - leak in system for FGP Pressure 0. FGP P1 = V7. Fluorometer has high voltage values during downcast ~1600m+ then also on upcast to ~800m. Tripped carousel positions 9-13 two times because FGP1 didn't change when bottle should have tripped. Stopped acquisition at 500m bottle stop. The maximum of 24 positions had been tripped with still 5 bottles to trip. Those remaining 5 were tripped during CTD019."

Station 19: "HPSS cast. This cast started at 500m after ending CTD018 at 500m bottle-tripping stop during the upcast. The maximum of 24 bottle positions were fired during CTD018 to double check that High Pressure bottle tripped. Thus acquisition had to be restarted to trip remaining bottles. Niskin bottle GOEX109 bottom cap broke before CTD017, replaced w/OTE112."


Details of CTD data processing steps:

are available with the CTD data from this cruise