CTD Processing Summary CalCOFI 2007SR CTD Preliminary Data
Download 2007SR CTD raw cast files zipped Download 2007SR 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) 0.00033 0.00170
Oxygen ml/L (dual Seabird SBE43) y = 1.04200x + 0.0002
R² = 0.9990
y = 2.3898x - 3.9207
R² = 0.9824
Oxygen umol/Kg (dual Seabird SBE43) y =1.0431x + 0.1487
R² = 0.9990
y = 2.3906x - 170.4218
R² = 0.9824
Single sensors Linear Polynomial
Nitrate - ISUS 4sec ave voltage vs Bottle NO3
(Satlantic ISUS v3 SN111)
y = 29.3821x - 11.0190
R² = 0.9865
 
Fluorometer - linear & polynomial regressions

y= 11.6649x - 0.4106
R² = 0.8343

y = 0.8675x2+ 12.3769x - 0.4559
R² = 0.8354

  
 
  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 2007SR cruise

CalCOFI 2007SR General Cruise & Cast Notes:

CalCOFI 2007SR sailed on Sally Ride at 0800 PDT 13 July 2020 from Marfac.  All 75 science stations were completed.

CTD General Notes and Problems:

CalCOFI used their 24-10L CTD-rosette with a two-pin termination, cable grip, deck unit, monitor, mouse &. SIO-CalCOFI used Sally Ride's computer and non-uplink deck unit, surface PAR; 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; Biospherical PAR & Surface PAR (mounted on the LTER GP van); MBARI-ISUS v3 w/ battery; SBE18 pH; altimeter. Refer to .hdr files for serial & model numbers or the table below. ISUS only worked during the first 20 stations of the cruise.

Setup: Using SIO-CalCOFI's 24-10L bottle CTD-rosette epoxy-coated standard bridle frame.
CTD - SBE 9+ (SN#3161-0936) Sensor Configuration
1° Sensors: freshly calibrated 2° Sensors:
 SBE 3plus temperature sensor (SN#2533);
 Conductivity SBE 4 Sensor (SN#3568)
 Oxygen SBE 43 Sensor (SN#0680)
 Pump
 SBE 3plus temperature sensor (SN#5109);
 Conductivity SBE 4 Sensor (SN#3569)
 Oxygen SBE 43 Sensor (SN#1075)
 Pump
Other sensors (unpumped)

Wetlabs ECO/FL Fluorometer SN#3122
Wetlabs C-Star Transmissometer SN#CST-811DR
pH SBE 18 SN#0709
Remote PAR SN#70209

CCE-LTER MBARI-ISUS v3 SN#111
Altimeter SN#46604
Carousel SBE 32 3217964-0225
Reference PAR SN#20514