DMO notes for event log
Duplicate Events in Original Event Log
22 duplicate event numbers have been identified in the original event log.
The duplicate events were corrected by adding one minute to the event time for the non-CTD event.
For reference, the duplicate events are listed in the file: SO-GasEx_Event_Log_DuplicateEvents.xls.
Modifications to Original Event Log
data column headers changed to be consistent with BCO-DMO vocabulary
"Event #" changed to "event", format remains the same
date reformatted to YYYYMMDD
time reformatted to HHMM
lat/lon decimal degrees padded to 6 decimal places
"OP ID" changed to "ev_code", format remains the same
"submitted by" changed to "person", format remains the same
"Event (be as descriptive as necessary)" changed to "activities_and_comments"
Note: some event fields were truncated due to excessive length (>120 chars)
Truncated event fields indicated by "[+++]" at end of activities_and_comments field
See below for complete activities_and_comments entry for truncated events
Complete activities_and_comments are also available in the original spreadsheet
(see link to original in Acquisition description)
Modification to data values:
090301.CLC. all positive longitude values changed to negative (West);
all incorrect longitude values were associated with DES type events
=========================
event date time longitude latitude ev_code
-------------------------
0640107 20080304 0107 47.775000 -50.698330 DES
0862007 20080326 2007 37.429910 -51.289290 DES
0870205 20080327 0205 37.428160 -51.428160 DES
0872149 20080327 2149 37.391970 -51.228610 DES
0880137 20080328 0137 37.314960 -51.318600 DES
0881536 20080328 1536 37.299140 -51.320470 DES
0882156 20080328 2156 37.307540 -51.315550 DES
0890307 20080329 0307 37.268260 -51.268260 DES
0900308 20080330 0308 37.298430 -51.311650 DES
0901353 20080330 1353 37.324940 -51.309600 DES
0910138 20080331 0138 37.350060 -51.303200 DES
0920144 20080401 0144 37.363990 -51.281180 DES
0921950 20080401 1950 37.457140 -51.374990 DES
PI notes for event log
Event Codes
DEP=depart
CTD=hydrocast
SUS=super sucker
OPT= optical cast
UWY=underway system
BOP=buoy operation
DES=discrete sample from underway line
SUR=survey using underway systems
INJ=tracer injection
Complete activities_and_comments entries for truncated events
event date time lon lat ev_code person activities_and_comments
0631700 20080303 1700 -58.329333 -50.806550 INJ Sullivan start filling ~4800 L aluminum dosing tank for
for tracer gases with ship's service seawater
(from tap outboard of the starboard crane
which is forward of the tank)
0641246 20080304 1246 -50.839000 -50.848000 UWY Drapeau started underway measurements of T, S, Chl a
fluorescence, optical backscattering, acid
labile backscattering (PIC), particulate light
absorption and attenuation, dissolved light
absorption and attenuation
0641527 20080304 1527 -43.167000 -50.333000 DES Lance Discrete sampling of underway line in main lab
for fluorometric chlorlophyll, Ap (particulate absorption),
trial PE exp (C-14 uptake vs. light gradient)
0652030 20080305 2030 nd nd INJ Sullivan start flow of SF6 through dosing tank (headspace
recirculation flow ~3 L/min; SF6 delivery pressure
40 psi, SF6 flow ~0.10-0.13 L/min)
0672352 20080307 2352 nd nd INJ Sullivan finish adding ~8.5 L 3He to water in dosing tank.
During 3He dosing, do two test tows of the lead
fish for dispensing. On one tow a pressure
transducer showed that the lead fish was 6-7 meters deep.
0680000 20080308 0000 nd nd INJ Sullivan replace dosing top with a dispensing top and balloon.
The balloon will be filled with water as the
dosed water is dispensed, thus avoiding a gaseous
headspace above the dosed water.
0770030 20080317 0030 nd nd INJ Sullivan Start recirculating headspace of dosing tank and
adding SF6 (~150-200 ml/min) to the recirculation
stream. Monitor flows/bubbling for ~1.5 hrs
0780740 20080318 0740 nd nd INJ Sullivan SF6 gas cylinder is observed to be empty. Switch
the pair of 3-way valves to isolate the recirculation
loop and headspace from the gas pump and turn off
the gas pump.
0791030 20080319 1030 nd nd INJ Sullivan Add a second (KNF Neuberger) gas circulating pump
to the recirculation loop. The two pumps are run in
parallel, with a loop of tubing and two 3-way valves
to bypass the dosing tank. Increase the pressure delivered
by the SF6 gas cylinder through a needle valve from 40
to 50 psi, to offset the increased back pressure from
the output of the two pumps pushing through the 'fizzy' tube.
0802200 20080320 2200 nd nd INJ Sullivan Turn the two 3-way valves so that the gas pumps are
connected to the bypass loop. Add seawater to the tank
and dosing top so that there is ~0.7 L of gaseous
headspace in the dosing top.
0802249 20080320 2249 nd nd INJ Sullivan Isolate the dosing tank headspace by turning the 3-way
valves and turning off the gas recirculation pumps.
While the gas recirculation was ongoing, the foam/bubbles
reached the ~80% full level of the 1L dosing top.
With bubbling stopped, there remains ~0.65 L headspace.
0811159 20080321 1159 -38.430000 -51.150000 INJ Sullivan Water-filled balloon in "headspace" of dosing tank bursts.
Stop water flow out of dosing tank;
continue augmenting water flow for ~5 minutes.
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