Ocean Carbon and Biogeochemistry: Data System

MedFlux cruise: EN402 March 2005
Niskin bottle data processing notes

31 January 2006: 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 final base Niskin bottle sample data file, from the CTD station *.btl files.

Final CTD station header record showing history of CTD processing steps during which *.btl files were created:
EN402_ctd011_hdr.txt

Final Niskin bottle file header record from .btl file:
EN402_ctd011_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 all stations except station 11 (only 11 bottles), and there is no bottle data for station 5.

Some parameters were calculated using MATLAB Physical Properties of Seawater Toolbox:

Depth   [ sw_dpth.m ]

depth=sw_dpth(data.prs,43);   % latitude fixed at 43 ° N

Density   [ sw_dens.m ]

sigma-t=sw_dens(data.ctdsal1,data.ctdtmp1,data.ctdprs,0)-1000;

Potential Density   [ sw_pden.m ]

sigma_0=sw_pden(data.ctdsal1,data.ctdtmp1,data.ctdprs,0)-1000;

Potential Temperature   [ sw_ptmp.m ]

potemp=sw_ptmp(data.ctdsal1,data.ctdtmp1,data.ctdprs,0);

Details of CTD data processing steps:

are available with the CTD data from this cruise