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CTD Processing Summary CalCOFI 1104SH CTD Data (reprocessed 2014; reformatted 2017)
Download 1104 CTD raw cast files zipped Download 1104 FinalQC CTD + bottle data (2017 version)
General CTD Notes - see below; data acquisition notes, logistics, processing
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)

 0.65633 (Cast 31-35)
 0.68847 (Cast 36)
-0.00528 (Cast 37-114)

-0.00528
Oxygen (dual Seabird SBE43) y = 1.0202x - 0.0018
R² = 0.9998
y = 1.0273x - 0.0212
R² = 0.9998
Single sensors
Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2) y = 28.404x + 0.5184
R² = 0.9877
Please note there was an issue with the ISUS low end detection. Satlantic changed the bulb after this cruise.
Fluorometer - polynomial & linear regressions

y = 11.462x2+5.7094x-0.0373

R² = 0.7163

y = 10.207x - 0.2017

R² = 0.688

  
Primary CTD O2 Sensor vs Bottle O2
  
Secondary CTD O2 Sensor vs Bottle O2
MBARI-ISUS Voltage vs Bottle NO3 Seapoint Fluorometer Voltage vs Chlorophyll-a
 
CalCOFI 1104SH CTD Cast Notes:: 

MBARI-ISUS nitrate sensor had problems detecting nitrate values below 2µM/L this cruise. Post-cruise investigation by MGS & Satlantic found that lamp replacement was necessary.

Casts 1 - 67 = Cast  31 - 114; CalCOFI was the second leg of the 2011 Spring CalCOFI/DEPM cruise. NOAA Fisheries had performed 30 stations prior to our first CTD station so order-occupied was continued for data integration & book-keeping.

Cast 31 - 36 (1 - 6) had a problem with the primary conductivity sensor resolved after the first bottle salts were run on leg2, day 2. Different salinity offsets are applied to the primary CTD salinities 31-35, 36, and 37-114. After cast 36, the conductivity sensor was replaced; casts 31-36 were processed with different xmlcon files
than 37-114 for this reason.
Console Ops CTD Operator Notes:
Cast 32 - winch operator started bringing the CTD back up immediately after he was told "stop". Yo-yo'd back down to ~15m (SCCOOS).
Cast 34 - switched out Deck Unit in hopes of rectifying rs232 problem. Salinity sensors disagree by ~0.6PSU.
Cast 35 - error light flashing on deck unit, primary conductivity low
Cast 35 - 39 - bottom depths off charts since bottom sounder isn't working below ~500m
Cast 36 - -0.250 pressure offset applied precast; deck pressure kind of high
Cast 37 - new conductivity sensor installed (#3568)
Cast 39 - bottle #9 mistrip
Casts 40-44 numbering changed to match NOAA Fisheries order occupied; trawls = 40, 41, 44; subsequent CTD casts numbered to match NOAA order occupied.
    cast 40 renumbered to cast 42
    cast 41 renumbered to cast 43
    cast 42 renumbered to cast 45
    cast 43 renumbered to cast 46
    cast 44 renumbered to cast 47
Cast 43 - primary & secondary oxygen sensors disagree by ~0.03-0.05
Cast 46 - primary & secondary oxygen sensors disagree by ~0.05
Cast 47 - restarted after winch failure at 50m; CTD returned to surface, cast restarted; unusual 'feature' around 280-310m downcast.
Cast 48 - event log lat-lon not changing
Cast 50 - bottle 3 replaced
Cast 51 - severe wire angle, 580m of wire out to reach 515m
Cast 52 - CTD sent back down to get 78m, yo-yo'd - 86>70>78>70>63...
Cast 56 - moderate seas - big ship rolls
Cast 58 - file initially named improperly, resulting in loss of downcast; upcast good
Cast 61 - 3 trawls before cast
Cast 66 - trawled onto station; winch could not go down faster than ~35m/min; worked fine on upcast
Cast 73 - Santa Monica Basin; shallower than normal at ~700m; 24 bottles closed
Cast 74 - shallow ~30m nutricline & thermocline
Cast 80 - three chl maxes
Cast 84 - downcast & upcast different especially in upper 50m
Cast 86 - bottle 17 open upon retrieval
Cast 87 - unusual salinity & oxygen feature at ~180m
Cast 88 - winch problem on downcast at ~480m; stopped then down to 515m; weather calm
Cast 92 - strong deep current below ~380m
Cast 94 - windy, big swell and rolls
Cast 98 - deep 40m SCCOOS station; ship refused to go shallower
Cast 99 - Santa Barbara Basin station
Cast 102 - on downcast ~450m O2 & NO3 up, T & S down - feature
Cast 109 - 200m bottle closed at 220m by mistake









 
 

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