CTD Processing Summary CalCOFI 1501NH CTD Final Data
Download 1501NH CTD raw cast files zipped   Download 1501NH FinalQC CTD + bottle data
Note: Metadata files compiled from CTD processing are split 1-64 (dual TCO), 65-100 (single TCO)
General CTD Notes - data acquisition notes, logistics, processing - see below
CTD sensor corrections derived by comparing 4 secs of CTD sensor data (prior to bottle closure) to bottle samples
Dual T, S, & O2 Primary Sensor Secondary Sensor
Salinity offset (bottle - CTD salinity; > 350m only; Seabird SBE4) -0.00232 0.00084
Oxygen ml/L (dual Seabird SBE43) y = 1.0507x - 0.0094
R² = 0.9997
y = 1.0397x - 0.0132
R² = 0.9998
Oxygen umoles/Kg (dual Seabird SBE43) y = 1.0507x - 0.4099
R² = 0.9997
y = 1.0397x - 0.5732
R² = 0.9998
Single sensors Linear Polynomial
Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2) y = 27.23x - 7.1464
R² = 0.9945
Fluorometer - linear & polynomial regressions

y = 7.1988x - 0.2187

R² = 0.8363

y = 7.2289x2+5.7762x-0.1677

R² = 0.839

  Secondary CTD O2 Sensor vs Bottle O2
MBARI-ISUS Voltage vs Bottle NO3 Wetlabs ECO/FL Fluorometer Voltage vs Chlorophyll-a
General notes: These are cast & final CTD Processing Notes from 1501NH cruise

CalCOFI 1501NH General Cast Notes: This cruise occupied 100 stations: 93 standard, & 7 SCCOOS.  The stations were occupied in traditional sequence but MBARI-SECRET 20nm stations, 63.65 63.75 63.85 & 63.95 were not occupied. SCCOOS stations 80.0 50.5 (too rough, windy night) & 85.4 35.8 (offline, shiptime) were not occupied. No CTD casts deeper than 770m were performed - no 1000m MBARI-SECRET casts on Line 63 & no 3500m casts on 90.90 or 80.90.
CalCOFI 1501NH was on SIO RV New Horizon. STS' two-wire termination was used intially but after three short but problematic casts, a new termination was done. 150m of severely rusty wire was removed then a fresh termination of the three-conductor wire done by JRW. As recommended by STS, only the white conductor and shield were used for signal & ground (as the first three stations). There were problems with the pumps failing after 50m so the secondary pump was disconnected. For casts 04-11, only the primary sensors T, C, & O2 were collecting good data. Since using a single conductor for signal proved unreliable, the black+white conductors were combined for signal, shield as ground and new secondary pump installed. This solution worked and both sets of T C O2 sensors logged data for casts 12 - 63. On cast 64, the CTD failed during the downcast. The only viable workaround was to run primary T, C, O2 & pump only for casts 65 - 100. It is uncertain whether the CTD fish or deck unit were having problems or the conductive wire. (Note: CTD fish and deck unit tested fine so problems are attributed to the wire quality). The CTD & deck unit were sent to Seabird post-cruise for service. Please note that wildedit was applied to the CTD data to despike the sensor data - there were a few casts with significant spikes resulting in data gaps in 1m averaged data. Downcasts should be good but there are a few upcasts with spikes when triggering bottle closure. Please refer to specific cast notes below.

CTD initial configuration was standard: Seabird 911+ with dual T, C, O2, & pumps;  Wetlabs C-Star 25cm transmissometer; Biospherical QSP200L PAR;  Datasonics/Benthos Altimeter; WET Labs ECO-AFL/FL; Seabird  pH; Satlantic ISUS v2 & battery. Please refer to the xmlcon files or cruise  prospectus for additional info. The secondary pump was disabled for a couple casts at the beginning of the cruise; the secondary set of sensors were disabled after cast 64 for the remainder of the cruise.

Cast Notes:

Cast 01 - non-confirmations for bottles #2 at 50m and #3 at 42m; suspect #1 was 60m then #2 was 36m, both prodo bottles. Noisy signal & spikes noted on upcast; downcast looks okay.

Cast 02 - SCCOOS shallow station immediately after Cast 01; signal noise but 4 bottles marked, tripped, & closed.

Cast 03 - SCCOOS shallow station; downcast prfiles looks okay; upcast: 5m bottle #4 did not close - carousel jumped from 4 to 2 so additional trips were necessary to catchup. CTD reterminated post-cast.

Cast 04 - 93.28 severe problems, lost 12hrs troubleshooting CTD issues; CTD reterminated after 150m of wire removed. CTD pumps are turning off at ~50m on downcast. Additional solutions attempted: 1) 1° conductivity sensor changed before cast; 2) carousel changes as per DAG suggestion; 3) new pump cable; 4) new pylon cable; 5) spare deck unit used; 6) dummied secondary pump WORKED. So secondary sensor data on casts 004 - 011 are bad.

Cast 04 - 11  primary sensor data good, secondary sensor bad - no pump

Cast 06 - bottom valves on bottle #1 & #20 replaced post-cast, drippy

Cast 08 - bottle #10 replaced, bottom o-ring leaking

Cast 12 - backup pump installed as 2°; dual conductors - black & white combined for signal, shield as ground. Both pumps & sensor sets are working.

Cast 15 - rockin-rolling

Cast 19 - 15kt winds but relatively calm

Cast 20 - some big rolls

Cast 21 - rolling

Cast 22 - windy, rolling

Cast 23 - going down slow 30m/min then 40m/min; sunny but windy & rough

Cast 24 - going down slow 30 then 40 - rough seas

Cast 25 - mid-size rollers

Cast 27 - calmer; two markers at 440m - file edited/corrected

Cast 29 - calm sunny

Cast 37 - calm bright but cloudy; transmissometer dropout @ 500m downcast

Cast 40 - small pH spike at 330m on downcast

Cast 45 - calm morning; Fukushima water collected from underway since all bottle needed

Cast 48 - no nav file; created one from marker file

Cast 60 - RS232 issues, deck unit reset seemed to fix the glitch; MET system froze & was reset as well. Extra 4om tripped & ignored

Cast 61 - relatively calm with some big rolls - trough

Cast 62 - deck unit error lights flashed red at 35m downcast; spikes in O2 135m downcast; fluorometer spike @ 458m upcast. Connectors checked and serviced post-cast.

Cast 63 - all sensors glitched out at 85m on downcast but transient

Cast 64 - carousel reset after major spike, RJ did not fire enough bottles to "catch-up" so no bottles closed less than 200m ie only the 1st 7 depths from 515 to 200 trapped water. Downcast does not look bad but the transmissometer dropped out at 450-515m downcast. Pre-cast notes by RJ: deck unit displaying zeros on all channels, changed sea cable slo-blow fuse & fast-blow fuse. Numbers came back but it was decided to run only primary sensors and disable secondary sensors & pump.

Cast 65T - test cast, primary T, C, O2 & pump only on white & black conductors. Looked at sliprings but did not see any obvious problem. Test successful.

Cast 65 - single sensors no problems at all

Cast 66 - Fukushima seawater collected at 25m bottle 19 (should have tripped another for 20L; used remainder of bottle 18) and surface bottle 22. Pr offset adjusted by -0.05.

Cast 69 - rough seas again

Cast 70 -71 - moderate rollers

Cast 73 - no nav file created - will create one from marker

Cast 75 - big rollers, transmissometer failure 450-515m downcast.

Cast 76 - big rollers, hard to hit target depths; transmissometer out at 500-515m

Cast 77 - big rollers, hard to hit target depths; transmissometer out at 480-515m

Cast 78 - big rollers, hard to hit target depths; transmissometer out at 480-515m

Cast 79 - rough sunny weather; Windex bottle broke in wetlab (ammonia?); transmissometer okay

Cast 80 - moderate seas; transmissometer dropped out ~450-515m downcast

Cast 81 - Transmissometer spikes ~430-490m

Cast 82 -84 - Transmissometer squirrely ~450-500m downcast; no spare (Goericke's spare uses older connector)

Cast 85 - crossed lanyards on bottles #2-3

Cast 86 - 100 - 12 bottle casts, Leg II after 8 scientists disembarked in Santa Cruz/Monterey

Cast 88 - 100 - Transmissometer squirrely ~400-515m downcast; no spare (Goericke's spare uses older connector)

Cast 92 - moderate rollers

File notes:
08Mar2017 update to 20-1501NH_CTDFinalQC.zip file:

Seasoft-generated asc-hdr files are available renamed to 20-1501NH_LLLLSSSS_###d or u.asc & .hdr. Voltages in the .asc files were also relabled. Since this makes it difficult to reprocess & merge with bottle data if necessary, the original .asc, .hdr, & .btl have also been archived. Their voltage header labels have not been changed so refer to the corresponding .hdr file for sensor configuration. This cruise had both single T,C & O2 and dual T,C, & O2 - refer to notes.

Missing nav files created from mrk files: Cast 41, 62, & 73

Mislabels found and corrected:

Cast 09 - cast mislabeled 08 in hdr, hdr & hex files corrected using text & hex editors.
Cast 68 - sta mislabeled 90.0 in hdr, should be 80.0; hdr & hex files corrected using text & hex editors.

26Feb2015 / 16Aug2016(final update) / 08Mar2017 (CTD.csv file renaming; .asc file sensor-voltage relabeling)

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