|CTD Processing Summary CalCOFI 1601RL CTD Final Data - 14Mar2017|
|Download 1601RL CTD raw cast files zipped (rev 22Mar2017)||Download 1601 FinalQC CTD + bottle data (22Mar2017 revision)|
General CTD Notes - data acquisition notes, logistics, processing - see below.
Final data include the 10May2016 reprocessed secondary CTD oxygens; 22Mar2017 reprocessed cast 099
|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)||-0.0007||0.002354|
|Oxygen ml/L (dual Seabird SBE43; 2° O2 Calib Off)||y = 1.0361x - 0.0043
R² = 0.9999
|y = 1.0716x - 0.0235
R² = 0.9996
|Oxygen umol/Kg (dual Seabird SBE43; 2° O2 Calib Off)||y = 1.0376x - 0.0851
R² = 0.9999
|y = 1.0731x - 0.9237
R² = 0.9996
|Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2)||y = 29.475x - 2.8237
R² = 0.9922
|Fluorometer - linear & polynomial regressions||
y = 7.9516x - 0.2637
R² = 0.9160
y = 6.1733x2+6.3849x-0.1981
R² = 0.9205
|General notes: These are cast & FINAL CTD Processing Notes from 1601RL cruise|
CalCOFI 1601RL General Cruise & Cast Notes:
Stations and Station Order: this cruise occupied 104 stations: 95 standard & 9 SCCOOS. The station order was standard south-north, west-east-west. After the standard southern 74 station pattern was completed at 76.7 49.0, the rosette seawater sampling was reduced from 24 to 12 bottles. After sta 70.0 51.0, most of the SIO scientific personnel disembarked in Monterey.
The Pt Dume SCCOOS station at 85.4 35.8 was occupied last, during the transit home as sta 104.
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 this cruise but the primary oxygen sensor and secondary sensor were noticeably different (~0.3 ml/l) - both responded properly so refer to the bottle-corrected data for best data. Jan 6th, day of departure, was extremely stormy so the ship stayed in San Diego Bay till early Jan 7th. Due to this loss of shiptime the 3500m deep casts on sta 90.90 was not performed. The transmissometer did not have the dropout problems of the previous cruise usually seen after the 3500m deep cast. The ISUS was mounted vertically, with optics pointing down. pH sensor was lab-calbrated before the cruise and appears to have worked fine. Comparison to check DIC-pH samples are pending.
Logistics: CalCOFI 1601RL was CalCOFI's first cruise on NOAA R/V Reuben Lasker. We did a Dec pre-holiday load & setup since the departure was scheduled so soon after the post-holiday return Jan 4th. Two days of loading and setup were performed at 10th Avenue Marine Terminal on Dec 21 & 22. Final setup and securing were performed Jan 4-5. We sailed Jan 6th, performing an acoustic calibration in San Diego Bay anchorage off Shelter Island. High winds and stormy weather Jan 6th delayed our departure out of San Diego Bay until daybreak Jan 7th.
RV Reuben Lasker does not have a Knudsen 3 or 12kHz echosounder to find the bottom depth. The EK60 system or bridge charts provided bottom depths.
10 May 2016 - the secondary CTD oxygen sensor was used on CalCOFI 1604SH so the xmlcon coefficients were carried over from 1601RL. It was discovered the wrong sensor serial number was set on 1601RL ie wrong coefficients. So all the casts were reprocessed using the correct secondary CTD oxygen coefficients. All plots and data files have been updated. All other sensor data are unaffected. These data should be close to final although once final bottle are available, the bottle-CTD merge will be redone.
Cast 901 - San Diego Bay anchorage acoustic calibration sound velocity CTD cast to 8m. No water samples, just a sensor profile.
Cast 001 - 002: computer date & time were wrong; the primary CTD PC was replaced by the backup system which had the wrong date & time. Time was fixed before cast 003.
Cast 005 - wire angle going up & down
Cast 006 - bottle #5 O2 draw temperature was warm = mistrip
Cast 007 - RV Lasker survey tech Jacyln M. performed the cast, trained by JRW
Cast 015 - bottle #18 mistrip, tripped but no closure; carousel crown swapped while trigger was replaced
Cast 016 - backup carousel crown problematic - bottles #16 & 17 did not close so the CTD was sent back down to 60m, 50m, 40m (bottles #21, 22, 33). Original crown was installed post-cast, post-rebuild.
Cast 017 - bottle #21 mistrip sp CTD sent back to 13m, tripped bottle #24
Cast 018 - mistrips on bottles #5, 21, 13; CTD sent back to 84m & bottle #24 was closed, collecting seawater missed by #13. Carousel serviced again post-cast
Cast 019 - all bottles tripped & O2 draw temperatures look good; some "noise" in the surface data was noted at start
Cast 020 - early prodo cast, nets first
Cast 023 - no mistrips detected
Cast 027 - bottle #21 was open at surface so CTD was sent back down to 10m & #23 tripped for NCOG; #5 was opened, no samples; #6 O2 draw temperature was warm = mistrip, closed at shallower depth
Cast 028 - #5 mistripped again, no samples; #5 & #6 triggers were cleaned last cast but there was no time to replace triggers because of NCOG filttrations
Cast 029-034 - no mistrips detected
Cast 035 - AB Allen was late getting out on deck - no one told him we were arriving on station. CTD wire was out of the sheave on 1st lift off deck - odd scraping noise, CTD was lowered, wire inspected for damage - looked fine, CTD slack taken up slowly and 2nd lift off deck was fine. JRW told the winch operator to stop at 480m but it kept going so the CTD probably landed on the bottom, according to the altimeter. CTD was brought up 5m to 480m and bottle #1 closed. This station is usually a full cast so station position may have been off. Data look fine and there were no visible signs of any damage.
Cast 037 - CTD was sent back down to 46m from 40m after 50m (prodo depths), bottle trip initially missed by operator.
Cast 039 - bottle #9 was a duplicate trip; bottle #4 O2 draw temp was warm, mistripped
Cast 041 - winch readout failure, cast stopped at 320m, CTD returned to surface, cast restarted. Aborted cast data file labeled 1601041A; full cast 1601041 includes all bottle closures & mrk file. Cause : emergency stop button had been pressed on the bridge accidentally (apparently too easy to do when leaning over the console), twisting the button to reset took awhile to figure out.
Cast 044 - ISUS battery not plugged in; no ISUS-NO3 data; battery "C" was installed post-cast.
Cast 045 - bottle #21 was tripped and closed at surface but was empty (a real head-scratcher; drained or tripped out of water); bucket sample taken for surface samples
Cast 049 - cold,foggy night; big rolls +-5m
Cast 053 - bottle #11 & 12 were extra bottle trips
Cast 061 & 065 - big, slow ship rolls
Cast 066 - big slow rolls; CTD pressure offset adjusted precast from -1.55 to -1.70 so -0.15
Cast 075 - switched to table-driven 12-bottle rosette casts; bottom depth was only 35m though
Cast 076 - wire angle at start of cast ~15deg outboard
Cast 082 - bottle #10 didn't close (trigger 19)
Cast 084 - big roll cause CTD to come out, pumps went off so restarted and told winch operator to keep it covered
Cast 085 - rough night, big rolls
Cast 087 - leg 2 begins as most SIO personnel were dropped off in Monterey; 50m bottle #7 did not close so CTD was sent back to 50m and bottle #11 closed
Cast 090 - file misnamed 160190 then renamed post-cast to 1601090; filename embedded in 1601090.hex file is incorrect 160190.hex
Cast 094 - bottle #7 didn't close
Cast 095 - bottle #7 didn't close again so table-driven was changed to trigger 12 instead of 13; lanyard for #7 on trigger 12 from now on.
Cast 098 - 099 - shallow casts
Cast 099 - Line was mislabeled 63.3 (63.3 50.0), correct Line.Sta is 60.0 50.0 - corrected in all data including 1601099.hex.
Cast 104 - final cast
Mislabels found and corrected:
Cast 099 was mislabeled as sta 63.3 50.0 but corrected in post-processing to 60.0 50.0
Cast 090 filenames were mislabled 160190.hex, .hdr, .mrk... and renamed 1601090.hex... post-cast