CTD Processing Summary CalCOFI 1607OS CTD Final Data | |||
Download 1607OS CTD raw cast files zipped | Download 1607 FinalQC CTD + bottle data | ||
General CTD Notes - data acquisition notes, logistics, processing - see below. Please note that these regressions are generated from Final CTD vs bottle data and have gone through SIO-CalCOFI's strict data processing and point-checking protocol. CTD temperatures and salinities may not have changed from preliminary data but oxygen, estimated chlorophyll-a, estimated nitrate may change significantly after point-checking. Questionable or mistrip bottle data are removed from these comparisons but may be visible on the CTD.csv plots. For this cruise and future cruises, both primary & secondary sensor profiles vs bottle data will be generated and archived in the downloadable CTD+Bottle data files. These plots are under the "csv-plots\Primary" & "csv-plots\Secondary" subdirectories. |
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CTD sensor corrections derived by comparing CTD sensor data, 4sec average prior to bottle closure, to bottle samples | |||
Dual T, S, & O2 | Primary Sensor | Secondary Sensor | |
Salinity offset (bottle - CTD salinity; > 350m only; Seabird SBE4) | -0.0016 | 0.0053 | |
Oxygen ml/L (dual Seabird SBE43) | y = 1.0545x - 0.0193 R² = 0.9995 |
y = 1.0537x - 0.0245 R² = 0.9995 |
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Oxygen umol/Kg (dual Seabird SBE43) | y = 1.056x - 0.7146 R² = 0.9996 |
y = 1.0552x - 0.9304 R² = 0.9995 |
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Single sensors | Linear | Polynomial | |
Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2) | y = 30.457x - 1.4193 R² = 0.9946 |
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Fluorometer - linear & polynomial regressions |
y = 6.9049x - 0.161 R² = 0.7635 |
y = -0.4899x2 + 7.1037x - 0.1706 R² = 0.7637 |
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General notes: These are cast & final CTD Processing Notes from 1607OS cruise | |||
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CTD Notes or CalCOFI 1607OS Standard configuration for Seabird 911+: dual T,S,O2 pumped sensor arrays; one Wet-Labs ECO-FL fluorometer; one 25cm Wetlabs 440nm transmissometer; Benthos altimeter; SBE18 pH sensor; Biospherical surface and remote PAR; Seabird remote depth readout box; Satlantic MBARI-ISUS v2 & battery; SBE32 carousel. All casts were performed on SIO-CalCOFI's SBE11 deck unit, Windows 7 64-bit Asus blade PC using primary com port for data, USB-Serial dongle for carousel. 24-10L PVC no-metal, productivity clean bottles with silicone o-rings. RV Ocean Starr has 0.350 coaxial conductive wire, single core with copper shield twisted together into the ground connection. SIO-CalCOFI performed the termination and it worked for all casts. The only issue with the CTD wire was a persistent "spring-like" twist that would coil tightly when slack above the cable grip. Otherwise, winch operations and wire condition were fine throughout the cruise. The hydraulic trolley hoses suffered from cracking that caused fluid leakage onto the CTD-rosette twice early in the cruise. Also, at least one trolley wheel was frozen and did not roll but slide when moving the CTD in & outboard. During rough weather recoveries the upper ring was damaged as the rosette collided with the J-Frame. Also a narrow bend may have been caused by striking the trawl stancion just inboard and aft of the CTD-recovery area. Cast notes: |
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