|CTD Processing Summary CalCOFI 1504NH CTD Final Data|
|Download 1504NH CTD raw cast files zipped||Download 1504NH FinalQC CTD + bottle data Note: secondary oxygen sensor requires bottle-correction to be useful; calibration off.|
|General CTD Notes - data acquisition notes, logistics, processing - see below.
Please note that these regressions are generated from CTD vs final published bottle data after being reprocessed using final bottle data. CTD temperatures and salinities do not change much but oxygen, estimated chlorophyll-a, estimated nitrate may change significantly 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)||0.00065||-0.00181|
|Oxygen ml/L (dual Seabird SBE43; 2° O2 Calib Off)||y = 1.0446x + 0.0098
R² = 0.9993
|y = 1.2892x + 0.0202
R² = 0.9988
|Oxygen umol/Kg (dual Seabird SBE43; 2° O2 Calib Off)||y = 1.0446x + 0.4299
R² = 0.9993
|y = 1.2891x + 0.8855
R² = 0.9988
|Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2)||y = 27.545x - 8.6641
R² = 0.9927
|Fluorometer - linear & polynomial regressions||
y = 14.725x - 0.6984
R² = 0.781
y = 15.478x2+3.6149x-0.0063
R² = 0.8931
|General notes: These are cast & final CTD Processing Notes from 1504NH cruise|
CalCOFI 1504NH General Cast Notes: This cruise occupied 70 stations: 61 standard, & 9 SCCOOS. The stations were occupied in traditional sequence but offshore stations 86.7 110, 83.3 110, 83.3 100 were not occupied in order to finish the northern coastal stations. Other stations skipped because of bad weather: 86.7 70.0 & 83.3 60.0. Net tows were skipped initially on 83.3 51.0 & 80.0 51.0 but picked up on the transit south. All coastal SCCOOS stations were occupied. No deep CTD casts were performed - the 3500m cast on 90.90 was cancelled due to lack of shiptime. A standard 515m cast was performed on 90.0 90.0.
Cast 01 - 03: no issues reported on Console Ops.
Cast 04 - 93.3 28.0: all sensors look good except secondary oxygen which disagrees with primary by ~1 ml/l. ISUS profile looks noisier than usual but responsive. Basin-like low oxygen on this station in deeper samples, O2 bottle sample precipitate very white.
Cast 05 - calm night
Cast 06 - extra marker at 40m, edited out
Cast 10 - Happy Easter! Weather rough; chl max ~10m deeper on upcast. Post-cast readjusted 2° oxygen sensor in hopes of improving flow - didn't help, sensor calibration faulty.
Cast 11 - 95m fluorometer spike on downcast - considered "bug-on-the-windshield"
Cast 12 - extra marker at 200m, edited out post-cast/pre-<Ctrl><Alt>B (backup)
Cast 13 - extra marker at 170m, edited out post-cast/pre-<Ctrl><Alt>B (backup); bottle 24 tripped as extra bottle
Cast 14 - 4 10L bottles tripped at 10m for Fukushima seawater collection
Cast 15 - 1000's of small-medium pyrosomes seen prior to CTD launch - no apparent bio-fouling seen post-cast
Cast 17 - bottles #16 & #23 mistripped, no water
Cast 18 - some big rolls
Cast 20 - on upcast, CTD was lowered back to 75m after arrival and tripping of 40m bottle
Cast 22 - slow, big rollers; nice chl peak at 74m; deep noise on transmissometer on downcast - it had been behaving till now
Cast 24 - 90.0 60.0 wire angle/ship speed when CTD was at ~30m on upcast ***CTD landed badly, on side, bent/broke the upper ring, repaired & straightened as best possible post-cast. Continued to use primary rosette frame but upper ring was damaged, off-round.
Cast 26 - up & downcast different @ <400m
Cast 32 - ISUS not plugged into battery - no ISUS (v6) data; new 12v/5ah battery installed post-cast - trying out commercial battery pack instead of home-made
Cast 33 - new ISUS battery working fine
Cast 36 - bottle #23 did not close - mistrip no water from 10m
Cast 37 - transmissometer issues at depth on downcast
Cast 39 - rough weather, 20+kt winds; transmissometer flakey at depth on downcast between 450-515; fine on upcast (?)
Cast 40 - CTD prepped on station due to rough weather. winds 24-28kts; transmissometer outage fro 420-515m on downcast, upcast okay
Cast 42 - rough, big rolls; transmissometer outage @ 420-510m on downcast
Cast 43 - bottle 12 opened, mistrip
Cast 46 - abrupt thermocline at ~70m, spiked a bit; short delay at surface since aft control event log tablet had to be restarted
Cast 48 - 33kt winds at retrieval ie rough weather, no nets (nets were picked up on the way home)
Cast 50 - Fukushima seawater collected at 10m, 4 10L bottles closed
Cast 51 - noisy fluorometer profile due to high chl-a
Cast 54 - #16 mistrip, no closure, #23 mistrip no closure - closed using pole manually before retrieval
Cast 56 - extra 15m bottle for DIC tripped, all samples taken
Cast 59 - relatively calm; no nav file; #22 mistrip, no water from surface so bucket sample was taken
Cast 61 - #23 mistripped so bottle 24 was 10m and #23 was tripped manually with pole for surface
Cast 63 - bottle #16 mistrip, didn't close, next to bent stancion; cleaned post-cast
Cast 65 - bottles #15 & 16 tripped in reverse order; CTD lowered from 48 back to 56m
Cast 65A - 76.7 70.0 Fukushima water extra cast - 5@600m, 5@300m, 5@200m, 6@100m
Cast 66 - bottle #16 didn't close again, may be interference of bent stancion, no 40m water; fluorometer noisy > 180m; transmissometer issues @420-485m downcast
Cast 67 - position 16 was cleaned pre-cast but and extra bottle was tripped for insurance; O2 draw temperature looks good so bottle 16 did close at depth, salt taken from 17 to verify; trans bad 420-493 downcast
Cast 68 - salt & oxygen different on upcast between 125-60m
Cast 69 - 76.7 49.0 very high chlorophyll
Missing nav files:
Mislabels found and corrected:
07May2015/18Aug2016(final update)/18Mar2017(file renaming and sensor-voltage header labeling in .asc files)