CTD Processing Summary CalCOFI 0504NH CTD Final Data (reprocessed/reformatted 03/2019) | |||||||||||||||||||||
Download 0504NH CTD raw cast files zipped | Download 0504NH FinalQC CTD + bottle data | ||||||||||||||||||||
General CTD Notes - data acquisition cast notes, logistics, processing notes are listed below | |||||||||||||||||||||
CTD sensor corrections derived by comparing 4 secs of CTD sensor data (prior to bottle closure) to bottle samples | |||||||||||||||||||||
Dual T & S | Primary Sensor | Secondary Sensor | |||||||||||||||||||
Temperature, dual SBE3 | No offset or correction | No offset or correction | |||||||||||||||||||
Salinity offset (bottle - CTD salinity; > 350m only; Seabird SBE4; fliers excluded) | -0.0042 | -0.0038 | |||||||||||||||||||
Single sensors - note only one CTD O2 sensor ml/L uM/Kg | |||||||||||||||||||||
Oxygen (ml/L & uM/Kg; single Seabird SBE43) |
y = 1.3011x - 0.0246 R² = 0.9988 |
y = 1.3011x - 1.0676 R² = 0.9988 |
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Satlantic MBARI-ISUS (SN#919) deployed |
y = 26.868x - 4.8887 R² = 0.9972 |
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SCUFA Fluorometer - linear & polynomial regressions |
y = 12.978x - 0.1243 R² = 0.6663 |
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General notes: Station Pattern & Cruise Track
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CalCOFI 0504NH • 15 Apr - 01 May 2005 • SIO RV New Horizon • San Diego to San Diego
CalCOFI 0504NH occupied 75 of 75 scheduled stations. Primary sensor data were pretty clean but there were issues with the secondary conductivity sensor from surface to ~75m on many casts. ISUS batteries were swapped after every 3 casts since charging the battery on the rosette was not implimented yet. A Seapoint fluorometer was tested on the 1st three stations, Casts 001-003 on voltage 2, the ISUS channel. The SCUFA flurometer was used for all 75 stations and performed well. Oddly, the Altimeter on V6 and PAR on V7 were misidentified on several casts (001-009, 041-046; Par = V6, Alt=V7). These sensors were not changed so the .con files are incorrect. The voltage header in the .asc files were correctly labeled but caution should be used if CTD data is reprocessed for PAR.
All casts had the SCUFA fluorometer. Please refer to each casts hdr file for specific module settings and order of application. All other CTD sensors were not changed during the cruise.
Seabird 911+ configuration:
Primary Temperature (#2533), Conductivity (#2206), and O2 sensor (#680), pumped (#55060); Secondary Temperature (#1324), Conductivity (#722) pumped (#52236); Wetlabs (CST-490DR) 25cm transmissometer (mislabeled Chelsea/Seatech in con; used original calculated M & B); SCUFA fluorometer used on all casts; Benthos/Datasonics Altimeter (#46604);
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CalCOFI 0504NH CTD Data Processing & Console Ops Notes Removed salt fliers on both primary & secondary comparisons. Original data processor was MGS, but some addtional O2 & NO3 "flier" data points were removed by JRW in 2019 reprocessing. Deepest CTD cast was 691m at sta 86.7 40.0 Cast 036, Santa Monica Basin. Only one O2 sensor was deployed and a SBE11v1 Deck Unit - requiring Align-CTD offset of secondary conductivity (0.073sec) was used.
General Notes: We started data acquisition AFTER deploying and 2 minutes @10m soak. Loopedit & Wildedit were applied to all casts.
V0 - Tr (CST490DR), original M & B calculated pre-cast 1 were used Sensors: T1 - SN2533; T2 - SN1324; C1 - SN2206; C2 - SN722; O2 - SN680; PAR - 4544; SPAR - SN6369
Reprocessing in 2019 used new final .asc files to merge with bottle data. New .asc files were generated with wfilter applied to ISUS & other CTD sensors. WIth the continual problem with secondary salinity near surface on almost all casts, derived data such as density (sigma-theta) which rely on salinity, are also bad. Using primary sensor data is recommended.
Other cast issues noted during processing:
Mislabel line.sta in .hdrs:
Casts had integer Line.Sta but there did not appear to be any mislabeled station this cruise (or they were corrected when found).
Data issues:
No ISUS data collected on Casts: 001, 002, 006, 008, 009, 013, 015, 017, 030, 035, 037, 043, 044, 046, 054-057, 064
Almost all casts had bad secondary conductivity data in the upper 70m, stabilizing deeper. Use primary salinities for shallow values.
JRW 03/19/2019 |