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HOT-216 Day 1 Report
Operations continue as planned at Station ALOHA with some slight delays due to the longer than anticipated transit time to ALOHA as result of the large northerly swell. The primary production CTD cast scheduled to go to 1000 m was shortened to 200 m to allow for the primary production array to be deployed on time.
One of the ship's two generators was malfunctioning on the morning of 3rd Nov. The ship's engineers managed to resolve the problem.
Eight CTD casts have been conducted at ALOHA including one deep cast.
The sediment traps array was deployed successfully upon arrival at ALOHA. The primary production array was deployed and recovered without problems.
The ATE sampler was deployed but on retrieval was found not to have functioned correctly.
Sea conditions at ALOHA are very confused with two swells present. One large swell 6-8ft from the northwest and another smaller trade wind swell from the east is making the ride uncomfortable. Winds are 20-25 knots from the east.
Schedule of Activities
02 November 2009
Hour (HST) Activity
0900 Departed from Snug harbor
0930 Abandon ship and fire drills, followed by safety briefing
and science meeting
1200 Arrive at Station KAHE
1210 1000 m weight cast
1235 Hyperpro cast
1331 Station 1 cast 1 (1000 m)
03 November 2009
0153 Sediment trap array deployed
22 45.38'N 158 02.45'W
0225 Station 2 cast 1 (200 m)
0345 Station 2 cast 2 (200 m)
0552 Primary production array deployed
22 46.37'N 157 59.90'W
0616 Station 2 cast 3 (deep cast)
1020 Net tow
Ship generator problem resolved.
1224 Station 2 cast 4 (1000 m)
1335 Net tow
1415 ATE sampler deployed
1444 Station 2 cast 5 (1000 m)
1655 Station 2 cast 6 (1000 m)
1855 Primary production array recovered
22 47.85'N 158 02.83'W
1959 Station 2 cast 7 (1000 m)
2215 Net tow
2313 Station 2 cast 8 (1000 m)
Paul Lethaby
HOT-216 Chief Scientist
0105, 04 November 2009
HOT-216 Day 2 Report
Operations continue as scheduled at Station Aloha. The second deep cast has just been completed marking the end of the 36 hour burst sampling period. A total of 16 CTD casts have been completed at Station ALOHA including 2 deep casts.
The gas array was deployed successfully early this morning. There were some problems with the AC9 just before it was due to go in the water but it was fixed in time for it to be deployed. The hyperpro cast did not reach sufficient depth and had to be redone.
Filters from 150 m and 175 m depths on the PPO4 and PC/PN casts showed signs of a thick browny-red waxy substance on them. Filtering times were much longer (~12h).
The north-west swell continues at 6-8 ft with 4-5 ft seas from the north east. Winds calmed this morning to 15 knots but have built back up over the course of the day to 20-25 knots.
Schedule of activities
04 November 2009
Hour (HST) Activity
0100 Net tow
0158 Station 2 cast 9 (1000 m)
0430 Gas array deployed
22 46.48'N 158 0.87'W
0500 Station 2 Cast 10 (1000 m)
0757 Station 2 Cast 11 (1000 m)
1000 Net Tow
1055 Station 2 Cast 12 (1000 m)
1200 Hyperpro cast
Cast was repeated as first cast was not deep enough.
1255 Trouble shooting AC9
1310 AC9/Frrf/LIST cast
1402 Station 2 Cast 13 (1000 m)
1659 Station 2 Cast 14 (1000 m)
1958 Station 2 Cast 15 (1000 m)
2200 Net Tow
2303 Station 2 Cast 16 (4740 m)
End of 36 hour burst period
Paul Lethaby
HOT-216 Chief Scientist
0300, 05 November 2009
HOT-216 Day 3 Report
Operations are now complete at Station ALOHA. The sediment traps array, the gas array, and the sea glider were all recovered this morning sucessfully. The deep moored thermistor chain was ranged upon and and response was received. One AC9/Frrf/LISST cast, and two Hyperpro Optics casts were conducted. Two CTD casts were conducted near the WHOTS mooring (Station 52), one to 200 m and one one hour yo-yo to 200 m.
The near bottom cast at Kaena has just been completed and we are now transitting to Snug Harbour.
Winds are 15 - 20 knots from the east with seas and swell reduced from yesterday.
Schedule of activities
05 November 2009
Hour (HST) Activity
0305 AC9/Frrf/LISST cast
0400 Transit to recover sediment trap
0630 Recovered Sediment trap array
22 50.04'N 158 9.60'W
0735 Recovered Gas array
22 51.10'N 158 5.78'W
0945 Sea Glider recovered
22 46.75'N 157 59.01'W
1030 Ranged on deep moored thermistor string
23 43.99'N 158 1.08'W
1145 AC9/Frrf/LISST cast
1300 Hyperpro cast
Cast was repeated as first cast was not deep enough.
1403 Station 52 Cast 1 (200 m cast)
1515 Station 52 Cast 2 (200 m Yo-yo cast)
1700 Deployed ARGO float at southern edge of ALOHA circle
22 39.60'N 157 59.00'W
1710 Transit to Station Kaena
2249 Station 6 Cast 1 (2400 m)
06 November 2009
0045 Transit to Snug Harbour
Paul Lethaby
HOT-216 Chief Scientist
0215, 06 November 2009