|CTD Processing Summary CalCOFI 1311NH CTD Data Final|
|Download 1311NH CTD raw cast files zipped||Download 1311NH FinalQC CTD + bottle data|
|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)||0.00100||-0.00006|
|Oxygen ml/L (dual Seabird SBE43)||y = 1.0805x - 0.0153
R² = 0.9988
|y = 1.0362x - 0.0035
R² = 0.9989
|Oxygen umoles/Kg (dual Seabird SBE43)||y = 1.0805x - 0.6667
R² = 0.9988
|y = 1.0362x - 0.0153
R² = 0.9989
|Nitrate - ISUS 4sec ave voltage vs Bottle Nitrate (Satlantic MBARI-ISUS v2)||y = 26.985x - 4.1197
R² = 0.9930
|Fluorometer - linear & polynomial regressions||
y = 10.804x - 0.5708
R² = 0.8149
y = 6.8397x2+6.837x-0.3156
R² = 0.8333
|General notes: This is the final CTD Processing Summary from 1311NH cruise|
CalCOFI 1311NH General Cast Notes This cruise occupied 81 stations: 66 standard, 9 SCCOOS, and 6 DIC stations surrounding 80.55 (82.55, 81.55, 80.53, 79.55, 78.55, 80 57.5). The 6 additional stations (054-060) were 12-bottle 515m CTD casts. Bottles were closed at only 12 depths due to O2 flask limitations & analytical time. These stations lasted ~1 hour & transit times were ~1 hour - extremely calm weather helped facilitate the execution of these stations. Under rougher conditions, execution times would be double. The station schedule was modified to reduce the cruise track by 120nm, ~12 hours. Instead of continuing shoreward on line 83 to sta 83.42, the ship headed north from 83.51 to 82.55. Coastal stations on line 83 & 80 (51, 50.5) & Santa Barbara Basin were done after lines 80 & 77 were completed.
Cast 01 - 07 CTD signal is getting progressively noisey; conductive wire is suspect
Cast 08 - some noise & spikes, particularly below 300m; CTD downcast data for cast 8 looks okay, upcast is noisy below 200m
Cast 09 - significant noise & spikes, particularly below 300m; CTD data quality is questionable below 350m on downcast, & below 250m on upcast.
CTD re-terminated before Cast 10 - using black only single signal conductor with shield as ground. Cast 10+ profiles look noise-free.
Cast 021 was station 90.80 3500m cast; PAR, ISUS & battery, pH were removed since they are not rated for that depth.
Casts 54, 55, 56, 58, 59, 60 - only 12 bottle depths were sampled on these ancillary DIC-pH stations. In the CTD Final data zip archive, the CTD fluorometer sensor data plotted with bottle chlorophyll are cruise-corrected, not station-corrected since there are fewer samples above 200m.
The final CTD archive was updated in 2016, reprocessing added data-quality code columns and data codes on bad or missing data ("9") or questionable data ("8"). Data values should not have changed from the previously published final CTD data. But the column number on updated CTD.csvs has changed from 65 to 82. Refer to the CTD.csv data format webpage: 65-column index; 82-column index