# Version: 14 October 2013 # PIs: Hamme, Bender, Cassar # Final Underway O2/Ar - Sampling Log # ========================= Date_Time_GMT Event_or_Comment ------------------------- 1-Mar-08 13:14 Began collecting data. Sampling air only. Switching between capilaries every 10 minutes 2-Mar-08 03:05 System off 2-Mar-08 11:55 System on. Still sampling air. 2-Mar-08 13:35 Continuous seawater flow on. Flowing through EIMS system. 2-Mar-08 14:50 Oxygen optode placed in seawater. 2-Mar-08 17:10 Changed valve switching to repeating pattern of 10 min air; 20 min equilibrator. 2-Mar-08 20:33 to 2-Mar-08 20:55 Seawater flow off and optode out of water while tubing upstream of equilibrator was shortened. 2-Mar-08 21:30 Adjusted optode position deeper in flowing water. Temperature measured at optode decreased. 3-Mar-08 12:00 Changed valve switching to repeating pattern of 10 min air; 50 min equilibrator. 3-Mar-08 15:15 to 3-Mar-08 15:35 Seawater flow off and optode out of water while insulating tubing upstream of equilibrator. 4-Mar-08 00:36 to 4-Mar-08 21:18 Lost data from quadrupole mass spec during this time due to file use interference. 4-Mar-08 10:00 Changed valve switching to repeating pattern of 10 min air; 1 hr 50 min equilibrator. 4-Mar-08 21:35 to 4-Mar-08 21:50 Cleaning / changing filters. Optode out of water. Flow off. 5-Mar-08 16:49 to 5-Mar-08 17:00 Adjusting large flow of water. Optode out of water. Flow to equilibrator off. 5-Mar-08 20:02 to 5-Mar-08 20:09 Seawater flow off while adding valves to system. Optode out of water. Flow to equilibrator off. 7-Mar-08 22:35 Underway system off for tracer injection. Forced capillary to air sampling. Optode remained in water; but no flow past it. 7-Mar-08 23:45 Breathed on air inlet. CO2 increased. O2 decreased. 8-Mar-08 06:30 to 8-Mar-08 15:00 Quadrupole oxygen current flipping back and forth between two slightly different values as decreasing current brings it over AtoD converter threshold. 8-Mar-08 15:30 Performed mass calibration on quadrupole. 8-Mar-08 16:36 Cleaning / changing filters. 8-Mar-08 17:40 Filled graduated cylinder and bucket with fresh water. Small pump on. Recycling same water. 8-Mar-08 18:24 Moved pump inlet to bucket to provide larger reservoir. 9-Mar-08 00:09 Changed back to continuous seawater flow. 9-Mar-08 02:10 to 9-Mar-08 02:20 Repeat of oxygen AtoD converter threshold problem. 10-Mar-08 12:10 to 10-Mar-08 18:00 3 emission current faults in quadrupole. Filament turned itself off. 11-Mar-08 11:24 to 11-Mar-08 14:28 Quadrupole data loss 11-Mar-08 20:03 to 11-Mar-08 20:08 Cleaning out black filter. Small pump flow off. 13-Mar-08 01:55 Emission error turned off filament in quadrupole again. System problems being diagnosed. Seawater flows are off. 13-Mar-08 18:00 Seawater flows back on. Optode measuring again. Quadrupole still not producing reliable data. 15-Mar-08 18:00 Continued testing. Optode removed from seawater flow. 13-Mar-08 01:55 to 16-Mar-00 00:00 Things changed as part of diagnosis testing of quadrupole: Switched to filament #2. Replaced all capillaries. Opened and cleaned valco valve. Switched to larger size ferrules in valco valve. Replaced equilibrator cartride; which was probably the main reason for the fix. 16-Mar-08 00:00 Back to normal operation 17-Mar-08 00:13 Moved quad housing temperature sensor to somewhat different position inside housing. 17-Mar-08 15:30 Lab air thermistor was pulled out of Omega AtoD converter. Screwed back into terminals. 19-Mar-08 01:59 to 20-Mar-08 19:57 Periodic bursts of air bubbles in underway system. Causes spikes in optode oxygen sensor and N2/Ar ratio. No apparent effect on O2/Ar expect for really large slugs of air. 21-Mar-08 04:04 Seawater flow off for tracer injection. Quadrupole sampling air only. All thermistors gathered together in air to test for offsets. 21-Mar-08 18:00 Changed equilibrator cartridge. Back to normal operation 21-Mar-08 20:30 Emission error turned off filament in quadrupole again. Seawater flows are off. Equilibrator cartridge full of water and drips steadily with pump on; must be faulty. 21-Mar-08 20:30 to 22-Mar-08 16:00 Switched to new equilibrator cartridge. Continued problems. Discovered capillary was extending far into cartridge and likely touching membrane. Reterminated capilary and seated near swagelok fitting. 22-Mar-08 16:00 System returned to normal operation. 23-Mar-08 11:40 to 26-Mar-08 00:37 Periodic bursts of air bubbles in underway system. Causes spikes in optode oxygen sensor and N2/Ar ratio. No apparent effect on O2/Ar expect for really large slugs of air. 23-Mar-08 16:50 to 23-Mar-08 18:00 Signal may be compromised by intake of ship sewage. 27-Mar-08 15:09 to 27-Mar-08 15:30 Cleaning / changing filters. Optode out of water. Flow off. Apparent step change in O2/Ar at this time. Likely too long since filters were changed and system was experiencing internal respiration. 28-Mar-08 18:02 to 28-Mar-08 18:10 Cleaning / changing filters. Optode out of water. Flow off. 29-Mar-08 11:13 to 31-Mar-08 09:10 Periodic bursts of air bubbles in underway system. Causes spikes in optode oxygen sensor and N2/Ar ratio. No apparent effect on O2/Ar expect for really large slugs of air. 29-Mar-08 20:00 to 29-Mar-08 20:06 Cleaning / changing filters. Optode out of water. Flow off. 31-Mar-08 00:02 to 31-Mar-08 00:20 Cleaning / changing filters. Optode out of water. Flow off. 1-Apr-08 00:02 to 1-Apr-08 00:20 Cleaning / changing filters. Optode out of water. Flow off. 1-Apr-08 05:43 to 1-Apr-08 06:20 Continuous seawater system pump failure. 3-Apr-08 00:02 to 3-Apr-08 00:15 Cleaning / changing filters. Optode out of water. Flow off. 3-Apr-08 04:48 to Periodic bursts of air bubbles in underway system. Causes spikes in optode oxygen sensor and N2/Ar ratio. No apparent effect on O2/Ar expect for really large slugs of air. 5-Apr-08 00:03 to 5-Apr-08 00:15 Cleaning / changing filters. Optode out of water. Flow off. 5-Apr-08 16:04 to 5-Apr-08 16:30 Continuous seawater system pump failure.