CTD Processing Summary CalCOFI 2105SH CTD Preliminary Data
Download 2105SH CTD raw cast files zipped Download 2105SH Preliminary CTD + bottle data

General CTD Notes - data acquisition notes, logistics, processing - see below.
Please note that these regressions are generated from preliminary CTD vs bottle data and will be reprocessed once final bottle data are available. CTD temperatures and salinities do not usually change 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.
CTD sensor corrections derived by comparing CTD sensor data, 4sec averages prior-to-bottle closure, to bottle samples
Dual T, S, & O2 Primary Sensor Secondary Sensor
Salinity offset (bottle - CTD salinity; > 350m only; Seabird SBE4) 0.0012 0.0019
Oxygen ml/L (dual Seabird SBE43) y = 1.0441x + 0.0678
R² = 0.9991		 y = 1.0304 + 0.0680
R² = 0.9990
Oxygen umol/Kg (dual Seabird SBE43) y =1.0458x + 2.9613
R² = 0.9991		 y = 1.0320x + 3.0426
R² = 0.9990
Single sensors Linear Polynomial
Nitrate - ISUS 4sec ave voltage vs Bottle NO3
(Satlantic ISUS v3 SN111)		 y = N/A
R² = N/A		  
Fluorometer - linear & polynomial regressions

y= 6.4005x - 0.1646
R² = 0.9947

y = 0.8391x2+ 6.8458x - 0.1866
R² = 0.9953
  
 		   Secondary CTD O2 Sensor vs Bottle O2
MBARI-ISUS Voltage vs Bottle NO3 Wetlabs ECO/FL Fluorometer Voltage vs Chlorophyll-a
   
 
General notes: These are cast & preliminary CTD Processing Notes from 2105SH cruise

CalCOFI 2105SH General Cruise & Cast Notes:

CalCOFI 2105SH sailed on Shimada at 0800 PDT May 3rd 2021 from N Street.  44 of 75 stations were completed. Sea days had been shorten due to ship engine problems and Covid protocols.

CTD General Notes and Problems:

CalCOFI used NOAA's 12-10L CTD-rosette with a two-pin termination, cable grip, deck unit, monitor, mouse &. SIO-CalCOFI used personal computer and uplink deck unit; and wired/wireless data network.
Standard sensor configuration: dual T, C, & O2 on separately plumbed & pumped horizontal arrays; Wetlabs ECO-Fl fluorometer; C-Star transmissometer; SBE18 pH; altimeter. Refer to .hdr files for serial & model numbers or the table below.

Setup: Using NOAA 12-10L bottle CTD-rosette.
CTD - SBE 9+ (SN#3161-0936) Sensor Configuration
1° Sensors: freshly calibrated 2° Sensors:
 SBE 3plus temperature sensor;
 Conductivity SBE 4 Sensor
 Oxygen SBE 43 Sensor
 Pump		  SBE 3plus temperature sensor;
 Conductivity SBE 4 Sensor
 Oxygen SBE 43 Sensor
 Pump
Other sensors (unpumped)

Wetlabs ECO/FL Fluorometer SN#3122
Wetlabs C-Star Transmissometer SN#CST-811DR
pH SBE 18 SN#0709
Altimeter
Carousel SBE