|CTD Processing Summary CalCOFI 1507OC CTD Final Data|
|Download 1507OC CTD raw cast files zipped||Download 1507OC FinalQC CTD + bottle data Note: primary oxygen sensor data on casts 4 & 5 are bad. The sensor was replaced on cast 6.|
|General CTD Notes - data acquisition notes, logistics, processing - see below.
Please note that these regressions are generated from FINAL CTD vs bottle data. CTD temperatures and salinities have not change much but oxygen, estimated chlorophyll-a, estimated nitrate may have change slightly after point-checking.
|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)||0.0010||0.0039|
|Oxygen ml/L (dual Seabird SBE43; 2° O2 Calib Good)||y= 1.0528x - 0.0219
R² = 0.9996
|y = 1.0381x - 0.0158
R² = 0.9996
|Oxygen umol/Kg (dual Seabird SBE43; 2° O2 Calib Good)||y= 1.0547x - 0.8194
R² = 0.9996
|y = 1.0399x - 0.5543
R² = 0.9996
|Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2)||
y= 28.031x - 8.7794
|Fluorometer - linear & polynomial regressions||
y = 7.4981x - 0.2437
R² = 0.7392
y = -0.182x2+7.5075x-0.2442
R² = 0.7392
|General notes: These are final cast & CTD Processing Notes from 1507OC cruise|
CalCOFI 1507OC General Cruise & Cast Notes: This cruise occupied 71 stations: 63 standard, & 8 SCCOOS. The stations were occupied in a non-traditional sequence because of ship equipment failure and personnel delays. Offshore stations 86.7 110, 83.3 110, 76.7 100 were not occupied in order to maximize the number of stations completed. The Pt Dume SCCOOS station at 85.4 35.8 was not occupied since we transited directly from 86.7 70.0 south to San Diego. No stations or net tows were missed because of bad weather. But ancillary PRPOOS net tows on lines 86.7 & 83.3 were skipped and the 3500m deep CTD casts were cancelled to conserve shiptime. Standard 515m casts were performed on stas 90.0 90.0 & 80.90. PRPOOS net tows were done on all cardinal stations on lines 80.0 and 90.0.
Note: SIO-CalCOFI CTD-Rosette was running on R/V Oceanus CTD system - deck unit, dual-screen computer, remote-depth readout via serial com port, GPS via serial com port. Seasave data acquistion had to be restarted often to handshake properly with GPS NMEA or else it would timeout. This was the only issue, other than going offline when the 2nd winch was operating, noticed with the Oceanus deck unit hosting our 911+. Our seasave screen display configuration was used and coefficients were imported.
RV Oceanus prefers to keep the Knudsen 12kHz echosounder on at all times while at sea, continually mapping the bottom depth.
Cast 01 - no issues reported on Console Ops.
Cast 02 - no issues reported on Console Ops; secondary oxygen sensor may have some bad data points; when matched to bottle O2, some values were slightly higher at surface (biofouling?).
Cast 03 - no issues reported on Console Ops; secondary oxygen sensor may have some bad data points; when matched to bottle O2, some values were slightly higher at surface (biofouling?).
Cast 04 - 93.3 28.0: all sensors look good except primary oxygen - displaying negative values.
Cast 05 - 93.3 30.0 primary oxygen sensor still reading negative, replaced post-cast
Cast 06 - ISUS was left plugged in so it was unplugged and restarted during bottle prep; oxygen sensor #1590 was installed, #680 was removed precast. It was discovered that the secondary oxygen coefficients were from a previous calibration so coefficient from the most recent calibration were imported. Casts 1 - 5 xmlcon files were updated - 2nd O2 sensor #1075 coefficients should be May 2015 not Mar
Cast 08 - ISUS not charged between stations, no data
Cast 08-09 - Family emergency delay, Oceanus' Chief Engineer taken to San Diego after sta 93.45 & replacement flew in next day. Returned to station 93.50 36 hours later.
Cast 09 - bottle #5 trigger was stuck during prep, cleaned, seemed to fire okay - O2 draw temperature looked good.
Cast 10 - bottle #1 broke(!), samples questionable. No obvious reason - CTD did not hit the ship - but the bottle was cracked and the grey PVC end tube broke free from white PVC body. New bottle installed post-cast.
Cast 11 - bottle #16 did not close so the CTD was sent back down and #21 tripped at 39m. CTD continuous data "yo-yo".
Cast 12 - CTD AT DEPTH event was late, ~440m on upcast because event log tablet needed to be restarted.
Cast 13 - Event log program on CTD computer was restarted but "Start" was not pressed so GPS was not updating.
Cast 14 - calm night, lots of pyrosomes; unusual stratified salinity layers in upper 100m. Bottle #7 (200m) O2 draw temperature was high so most likely mistripped. Pylon was Q-Tip cleaned post-cast.
Cast 15 - ISUS not charged between stations but worked. Hard to get a good Knudsen bottom reading, over 4000m deep here.
Cast 17 - cast delayed due to winch readout issues; cast done but no wire out or wire speed. Fixed post-cast.
Cast 19 - O2 sensors not agreeing initially, ~0.1ml/l off at start
Cast 21 - bottle #23 did not close at surface so #24 was tripped
Cast 22 - waited ~20mins to deploy while 1st mate was being trained to setup into the wind & swell
Cast 25 - flurometer spikes on downcast - noise or bugs? pH cap left on - no pH sensor data.
Cast 26 - ~3min delay with CTD acquiring data at surface while the GPS-Event Tablet was rebooted. Some ship rolls in moderate seas. Doug on winch adjusting CTD depth as wire settles - nice! Bottle #16 possible mistrip, O2 draw temperature high.
Cast 27 - ship rolls even though relatively calm, data loops as we sit in the trough. Winch speed spike to 80m/min for a brief period after 100m, winch operator told to keep it below 60.
Cast 28 - bottles #16 & #22 did not close so CTD was sent back down and #23 & #24 were tripped at 28m & 1m respectively.
Cast 29 - pylon "crown" replaced with backup to alleviate mistrips
Cast 31 - ISUS battery deployed unplugged, anode fried; battery switched post-cast. No ISUS data this cast.
Cast 35 - unusual inversion at ~290m. Bottle #17 tripped but didn't close.
Cast 36 - Knudsen read 756 so target depth was 745 but altimeter kicked on at ~720m, reading only 25m off the bottom so CTD was stopped at 735m. Soft bottom or large wire angle - wire out 776, CTD depth reading 735.
Cast 37 - bottles #1, 16,& 17 didn't close; bottle #17 27m prodo depth collected in bottle #24 after sending CTD back down. Pylon crown switched back to previous one and problem triggers replaced from backup inventory.
Cast 38 - shallow 9 bottle cast on sta 86.7 50.0 but all bottles tripped to test rebuilt crown - all bottles closed.
Cast 39-40 - A failure of the ship refrigeration unit require a port call repair to Port Hueneme, 16 hour delay between Cast 39 87.55 & Cast 40 87.60.
Cast 41 - after station 87.60 there was a 2nd ship equipment failure of the main generator cooling pump seal, another port call to Port Hueneme for repairs was required(!), 22 hour delay to get the part couriered from Fresno and installed during a stormy Saturday. Station schedule redone to avoid rough weather offshore - coastal run first, heading north then out on line 77 (76.7) - doing the remaining line north to south.
Cast 44 - up and downcast different, internal wave.
Cast 45 - Santa Barbara Basin, extremely calm sunrise station with thunder showers and lightning on the coast nearby. Relative humidity in mid 90%s.
Cast 50 - wire out & Seabird depth readouts not working
Cast 51 - Nice chl peak at 38m, with spikes/noise at 122, 167, & 375m - will check the connector post-cast. Relatively calm but some big rollers. Upcast different than downcast - 350m feature noted.
Cast 52 - rolling so downcast speed being adjusted to reduce tension spikes; working quick so we can make prodo station, +-1m okay on bottle depths.
Cast 53-54 - mid-size rollers noted
Cast 55 - pH profiles have been looking odd - sensor needs to be sent back for maintenance post-cruise. GPS failure on CELog - no readout even after reboot. Turned out the rain had seeped into the wetlab and shorted out the GPS feed wire. Daryl was woken up and he reterminated the GPS wire. Light rain and moderate seas.
Cast 57 - Prodo+DIC+Cardinal! station
Cast 59 - higher frequency rolls. breather #18 closed but top valve opened
Cast 60 - barometer is finally reading to 10th on the MET screen thanks to Daryl (and my belated request). Some high freq rolls but relatively calm. Bottle #7 didn't close (200m). Triggers cleaned post-cast.
Cast 63 - pH is reading way too high
Cast 64 - short period rolls
Cast 65 - calm but some big rolls; good bottom trace
Cast 66 - soft bottom, poor bottom trace; last prodo station
Cast 69 - calm night with some small rolls, deep chl max at ~100m
Cast 70 - bottle #18 didn't close so CTD sent back to 25m to get that depth bottl #22, extra 10m tripped as well bottle #23
Cast 71 - Last station this cruise; bottle #21 didn't close so CTD was set back at surface for bottle closure at 2m bottle #21.
Mislabels found and corrected:
25Oct2016 - Final bottle data used to correct the CTD sensor data. Cast 008 ISUS data not collected, Cast 002-003 had some slightly higher oxygen values so they were excluded from the correction regression. Salinity offsets did not change. ISUS profiles seemed to have more noise ie not smooth but response looks good, high r2.
08Mar2017 - Final bottle-corrected CTD archive - 20-1507OC_CTDFinalQC.zip updated with additional CTD.asc & .hdr files relabeled and reheaders. See the 'FilenamingAndAscHeaderNotes.txt' file for additional info. Data themselves are unchanged.