1904RL CTD Processing Notes

CTD Processing Summary CalCOFI 1904RL CTD Final Data
Download 1904RL CTD raw cast files zipped		Download 1904RL Final CTD + bottle data
General CTD Notes - data acquisition notes, logistics, processing - see below. Please note that these regressions are generated from processed CTD vs FINAL bottle data and are considered done. CTD temperatures and salinities may not have changed significantly but oxygen, estimated chlorophyll-a, estimated nitrate may be significantly different than preliminary data. Questionable or mistrip bottle data have been removed from the correction regressions 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)	-0.00218	0.002378
Oxygen ml/L (dual Seabird SBE43)	y = 1.0277x + 0.0137 R² = 0.9996	y = 1.0536x + 0.0423 R² = 0.9996
Oxygen umol/Kg (dual Seabird SBE43)	y =1.0286x + 0.6031 R² = 0.9997	y = 1.0543x + 1.8765 R² = 0.9997
Single sensors	Linear	Polynomial
Nitrate - ISUS 4sec ave voltage vs Bottle NO3 (Satlantic ISUS v3 SN111)	y = 28.145x - 21.053 R² = 0.9956
Fluorometer - linear & polynomial regressions	y= 13.85x - 0.5885 R² = 0.8241	y = 19.225x2+ 4.5721x - 0.1043 R² = 0.908

General notes: These are cast & preliminary CTD Processing Notes from 1904RL cruise

CalCOFI 1904RL General Cruise & Cast Notes:

CalCOFI Spring Cruise 1904RL was scheduled to occupy 69 stations from San Diego to Pt Conception.

CTD General Notes and Problems:

CalCOFI used their 24-10L CTD-rosette on most of FSV Reuben Laskers' CTD system - their two-pin termination, cable grip, deck unit, monitor, mouse & remote depth readout box were used. SIO-CalCOFI installed their CTD blade PC (Win7), surface PAR (newly calibrated & cabled) and wired/wireless data network. SIO-CalCOFI's Seabird 911+, 24-bottle epoxy-coated rosette with standard bridle (LARS bridle removed) was deployed by the aft winch system.
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. Primary & secondary T, C, & O2 sensors were not changed from the last cruise, 1902RL, since their calibration & agreement were still on target and there were only 29 stations. ISUS was DI lab calibrated prior to the cruise. Both sensor sets worked fine throughout the cruise and no changes were necessary.

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#3284) Pump	SBE 3plus temperature sensor (SN#5109); Conductivity SBE 4 Sensor (SN#3569) Oxygen SBE 43 Sensor (SN#0680) 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, newly calibrated & repaired

Logistics & General System/Sampling Notes:

Cast Notes (transcribed from console ops, clipboard notes, & data processing):