2105SH CTD Processing Notes

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

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