From the TN303 cruise report:
\nTwo types of rosette/SBE9plus CTD casts (ODF/30L-Niskin and GT-C/12L-GoFlo) were made at 36\u00a0station locations during U.S. GEOTRACES EPZT. Deep ODF/30L-Niskin casts included a device\u00a0suspended 20 meters below the rosette, designed either to take a core sample or pick up particulates\u00a0from the sea floor.
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ODF/30L-Niskin Rosette/CTD casts were performed with a package consisting of a 12-bottle rosette\u00a0frame (SIO/STS), a 12- or 24-place carousel (SBE32) and 12 ea. 30L General Oceanics Niskin-style\u00a0bottles with an absolute volume of 30L each.\u00a0
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\u00a0A 12-place carousel was used on station 1, but had\u00a0repeated trip-confirmation failures during stations 2 and 3. It was replaced with an older 24-place\u00a0carousel mid-station 3, which resolved the trip-confirmation issues. Prior to station 4, the carousel head\u00a0was replaced by one with titanium instead of stainless steel latches in order to resolve mechanical tripping
\nissues. This \"hybrid\" carousel was used successfully for the remainder of the cruise.
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Underwater electronic components consisted of a Sea-Bird Electronics CTD (SBE9plus) with dual pumps\u00a0(SBE5), dual temperature (SBE3plus), reference temperature (SBE35RT), dual conductivity (SBE4C),\u00a0dissolved oxygen (SBE43), transmissometer (WET Labs C-Star), fluorometer (Seapoint SCF), Oxidation Reduction\u00a0Potention (ORP) sensor (NOAA), turbidity meter (Seapoint STM11) and altimeter (Simrad 807).\u00a0A second dissolved oxygen + oxygen temperature sensor (JFE Advantech RINKO-III) was incorporated\u00a0into the data stream for future sensor evaluation; it was not processed for this cruise.\u00a0Additionally, an SBE19plus CTD was mounted on the rosette during deep ODF casts for full and super\u00a0stations beginning with station 25, since it could no longer be deployed on deep McLane pump casts after\u00a0their wire was damaged.
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Shipboard CTD data processing was performed automatically at the end of each deployment using\u00a0SIO/STS CTD\u00a0processing software v.5.1.6-1. Raw GT-C CTD data and bottle trip files, acquired by SBE\u00a0Seasave V 7.17a on a Windows XP workstation, were also imported into the Linux processing system,\u00a0providing a backup of the raw data.
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Pre-cruise laboratory calibrations were applied, then CTD data were processed into a 0.5-second time\u00a0series, bottle trips were extracted, and a 1-decibar down-cast pressure series of the data was created.\u00a0The pressure-series data were used by the web service for interactive plots, sections and CTD data\u00a0distribution. Time-series data, and eventually basic up-cast pressure-series data, were also available for\u00a0distribution through the website.
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SIO/ODF CTD data were examined at the completion of each deployment for clean, corrected sensor\u00a0response and any calibration shifts. As bottle salinity and oxygen results became available, they were\u00a0used to refine shipboard conductivity and oxygen sensor calibrations.
CTD bottle data from 30-ODF (Ocean Data Facility 12 bottle, 30 liter Niskin rosette) EPZT Transect. TEI columns are incomplete. Refer to separate TEI datasets from GEOTRACES EPZT for those values.
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ODF CTD BOTTLE 20141030ODF
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Note: 'FLAG_W' columns = WHP (WOCE Hydrographic Program) quality flags.
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Processing notes from README provided by ODF:
\nThe CTD depths in the shipboard version (20 Dec 2013) of the data - bottle data in particular - were originally calculated incorrectly due to two software errors. \u00a0A small error in the gravity calculation affected both bottle and CTD data. In addition, the bottle file CTDDEPTH calculation was inadvertently using a combination of latitude and longitude, vs just latitude, as input to the gravity component of the depth equation, causing up to a 20m error in some of the casts.
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Two different depth calculations were subsequently added into these data files: the original, integrated Saunders-Mantyla integrated depth calculations (SMDEPTH), with the gravity error corrected; and the non-integrated Fofonoff-Millard depth calculations (FMDEPTH), same as those used by SBE. The Fofonoff-Millard depths are used for the primary CTDDEPTH column in both bottle data files.
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ODF reports that the\u00a0CTDDEPTH column agreed best with depths identified from CTD bottle trips recorded during GEOTRACES CTD acquisition.\u00a0The depth values in CTDDEPTH column are from the Saunders & Fofonoff 1976 calculation of depth from pressure. This is the same default calculation of depth used by SeaBird (SBE) software. GEOTRACES CTD data acquisition uses SBE software.\u00a0It follows that it would be preferable and consistent for GEOTRACES and ODF to use the values in the CTDDEPTH column.
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The ODF CTD data files are fully processed for PTCO. Lab calibrations were applied, except\u00a0for CTDO2; then shipboard corrections were determined and applied to all 4 parameters using\u00a0ODF software.\u00a0The PI for ODF CTD and bottle data is:
\nDr. James H. Swift (UCSD/SIO) (jswift@ucsd.edu.)
\nQuestions should (also) be directed to:\u00a0Susan M. Becker, ODF Supervisor (sbecker@ucsd.edu) and\u00a0Mary C. Johnson, data processor (mcj@ucsd.edu)
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Processing notes from README_1410.txt:
\nSeparate columns of S-M and F-M depths (\"SMDEPTH\" and \"FMDEPTH\") are included in bottle and CTD files. In addition, \"ODF_CTDPRS\" is an added column in the bottle files. This may differ from the main CTDPRS in the bottle file only for EPZT GT-C casts, where Seasave-processed CTD trip data were used.
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Note:\u00a0'FLAG_W' columns = WHP (WOCE Hydrographic Program) quality flags.\u00a0ODF used the WHP quality coding schema, but also included two non-standard quality codes in the GT-C bottle file:
\n- QUALITY CODE 'A' WAS USED FOR DATA VALUES SUBMITTED AS 'ABOVE DETECTION LIMITS'
\n- QUALITY CODE 'B' WAS USED FOR DATA VALUES SUBMITTED AS 'BELOW DETECTION LIMITS'
\nThis was at the request of two different PIs.