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CTD Processing Summary CalCOFI 1304SH CTD Data Final
Download 1304SH CTD raw cast files zipped Download 1304SH FinalQC CTD + bottle data
General CTD Notes - data acquisition notes, logistics, processing - see below
CTD sensor corrections derived by comparing 4 secs of CTD sensor data (prior to bottle closure) to bottle samples
Dual T, S, & O2 Primary Sensor Secondary Sensor
Salinity offset (bottle - CTD salinity; > 350m only; Seabird SBE4) 0.00469 0.00103
Oxygen ml/L (dual Seabird SBE43) y = 1.0415x - 0.0392
R² = 0.9998
y = 1.0368x - 0.0507
R² = 0.9998
Oxygen umoles/Kg (dual Seabird SBE43) y = 1.0417x - 1.7066
R² = 0.9998
y = 1.037x - 2.2099
R² = 0.9998
Single sensors Linear Power (Polynomial was similar to linear reg)
Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2) y = 28.229x - 8.4322
R² = 0.9896
 
Fluorometer - linear & poower regressions

y = 8.3501x - 0.2678

R² = 0.8724

y = 10.417x1.4264

R² = 0.9029

  
 
  Secondary CTD O2 Sensor vs Bottle O2
MBARI-ISUS Voltage vs Bottle NO3 Wetlabs ECO/FL Fluorometer Voltage vs Chlorophyll-a
 
General notes: This is the final CTD Processing Summary from 1304SH cruise
Please note that these data files are FINAL, bottle-corrected CTD data files.
Final CTD data are available after all CalCOFI 1304SH bottle data have been thoroughly point-checked. 
1304SH_CTDFinalQC.zip is distributed along with raw, unprocessed cast files. 
Eighty CTD stations were occupied 06 - 30 Apr 2013 on NOAA RV Bell M Shimada. Please refer to the 1304SH cruise summary,  & CTD hdr files for sensors-measurements collected and Seasoft modules applied. CTD data have been processed using Seabird's data processing suite, following their recommended methods for the SBE911+. Bottle corrected data are also included which improves the oxygen (SBE43) data quality, estimate nitrate data using ISUS measurements, & estimated chlorophyll from fluorometer voltages. 
Other sensors such as transmissometer are included but data quality control steps are not performed. Please refer to the metadata folder for bottle vs CTD sensor comparisons, regression coefficients and combined up and downcast csvs.
Please also note that these data were reprocessed in 2017 to update the final data format, adding data quality code columns.
2017 reprocessing added data-quality code columns and data codes on bad or missing data ("9") or questionable data ("8"). Data values should not have changed from the previously published final CTD data. But the column number on updated CTD.csvs has changed from 65 to 82. Refer to the CTD.csv data format webpage: 65-column index; 82-column index
JRW 15Feb2017
 
 
 
 
 
 
 
 
 
 
 
 
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