|CTD Processing Summary CalCOFI 1604SH CTD Final Data|
|Download 1604SH CTD raw cast files zipped||Download 1604SH FinalQC CTD + bottle data|
|General CTD Notes - data acquisition notes, logistics, processing - see below.
Please note that these regressions are generated from CTD vs final bottle data after reprocessing with final bottle data. CTD temperatures and salinities do not usually change but oxygen, estimated chlorophyll-a, estimated nitrate may have changed significantly after point-checking. Questionable or mistrip bottle data are removed from these comparisons and may be visible on the CTD.csv plots but have been flagged with quality codes. 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 average prior to bottle closure, to bottle samples|
|Dual T, S, & O2||Primary Sensor||Secondary Sensor|
|Salinity offset (bottle - CTD salinity; > 350m only; Seabird SBE4)||-0.0011||0.0035|
|Oxygen ml/L (dual Seabird SBE43; 2° O2 Calib Off)||y = 1.0435x - 0.0094
R² = 0.9996
|y = 1.0699x - 0.0124
R² = 0.9984
|Oxygen umol/Kg (dual Seabird SBE43; 2° O2 Calib Off)||y = 1.045x - 0.3165
R² = 0.9996
|y = 1.0715x - 0.4439
R² = 0.9984
|Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2)||y = 30.332x - 1.062
R² = 0.9921
|Fluorometer - linear & polynomial regressions||
y = 11.175x - 0.4098
R² = 0.829
y = 10.116x2 + 6.6184x - 0.1787
R² = 0.8574
|General notes: These are cast & final CTD Processing Notes from 1604SH cruise|
CalCOFI 1604SH General Cruise & Cast Notes:
Stations and Station Order: this cruise occupied 101.5 stations: 93.5 standard & 9 SCCOOS (0.5 station was sta 60.90 net-tow only station). The station order was standard south-north, west-east-west with a few changes between Lines 86.7<>83.3 and 76.7 <> 80.0 due to Navy operations. After 86.7 35, we sailed north to SCCOOS sta 85.4-35.8 & 83.3-39.4 then did 83.3-40.6 & 83.3-42.0 before returning to Line 86.7, sta 86.7-45.0. We occupied all stations on Line 86.7 out to sta 110.0, sailed north to Line 83.3 then continued station ops eastward till 83.3-51.0. Sailing between the islands to Santa Barbara Basin sta 81.8-46.9 and SCCOOS 81.7-43.5. Additional Navy operations required us to postpone sta operations on Line 80.0 west of sta 55.0 so after 80.0-51.0, we continued north to Line 76.7. Heading west till sta 100.0 then south back to Line 80.0 and shoreward. Unfortunately, bad weather cancelled cardinal stas 80.0-80.0 & 80.0-70.0. After completing 80.0-55.0, finishing the southern 75-sta pattern, most of SIO-CalCOFI personnel were dropped off in Santa Barbara. After which RV Shimada sailed north to Line 73.3 and the CTD-rosette seawater sampling was reduced from 24 to 12 bottles. Lines 73.3, 70.0, 66.7, 63.3, & 60.0 were completed in scheduled sequence. Weather kicked up again and on sta 60.90 only net tows were performed, no CTD-rosette deployment.
CTD General Notes and Problems:
The CTD configuration throughout the cruise was standard: Seabird 911+ (new pressure case since 1501) with dual T, C, O2, & pumps; Wetlabs C-Star 25cm transmissometer; Biospherical QSP200L PAR; Datasonics/Benthos Altimeter; WET Labs ECO-AFL/FL; Seabird SBE 18 pH; Satlantic ISUS v2, new lamp AND spectrophotometer (since 1511OC) & Wetlabs (custom) batteries. Please refer to the xmlcon files or cruise prospectus for additional info & metadata. There were no sensor failures or exchanges this cruise - all pairs of like sensor agreed well. A brand new SBE18 Oxygen sensor was deployed as primary oxygen sensor. RV Shimada's termination was used and worked throughout the cruise. About midway through the cruise, the cable-grip was moved up the wire to reduce the wear-tear on the exposed conductive core, moving in down onto the fish instead of by the shackle.
Logistics: CalCOFI 1604SH was on NOAA R/V Bell M Shimada. We had two scheduled days to load and setup although our departure delay gave us an extra day. RV Shimada sailed from San Diego 01 April 2016, two days later than schedule due to ship repair. Acoustics calibration was done dock-side so we did not anchor in San Diego Bay 01 Apr. Station work on sta 93.3 26.7 started before noon and all systems worked without issue.
RV Shimada's two-conductor termination was used with SIO-CalCOFI's 911+ CTD, deck unit, new primary CTD blade computer running Windows 7, depth-readout box, and SIO-CalCOFI's 24-bottle rosette. There were no issues with the conductive wire. Some scientific computers were connected to both the SIO data network and ship's network for internet access. Both the CESL sample log tablet and CELog event tablet performed more reliably when hard-wired to the data network. A wifi connection worked fine on the salt computer since hardwire connection was not available. All over the side deployments were coordinated by the Survey Techs, Scott & Kathryn, and deck crew. Scientists and volunteers sampled the rosette after it was retrieved by deck crew. CTD was deployed on the forward winch and nets on the aft winch, reverse of the RV Reuben Lasker deck ops.
RV Shimada does not have a Knudsen 3 or 12kHz echosounder to find the bottom depth. The EK60 system was interrupted from its normal 750m range when necessary.
The SBE32 carousel was rebuilt before the cruise and work very reliably. There was only one obvious carousel mistrip, other mistrips are attributed to lanyard issues not triggers.
Cast 001 - 007 original xmlcon files had incorrect secondary oxygen coefficients.
Cast 001 - 007: secondary oxygen sensor serial number and coefficients were wrong initially; all data fixed and xmlcons corrected.
Cast 001 - Messing with the rigging of the conductive wire near bottle #4 precast caused two issues: bottle #4 bottom cap was not open (seen closed during deployment) so bottle #5 was closed at 28m. ISUS battery was not plugged in so no ISUS data.
Mislabels found and corrected:
Cast 087 was initially mislabled as sta 76.7 55.0 but hex editor corrected to 66.7 55.0
Cast 088 was initially mislabled as sta 76.7 60.0 but hex editor corrected to 66.7 60.0
Bad samples or mistrips 6/30/2017:
Salt run for stas 036-039 had a bad sample count (29, should be 28), salts rerun