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HOT-86: Chief Scientist ReportChief Scientist: D. HEBEL
HOT 86 Cruise Report
R/V Moana Wave
31 July - 4 August 1997
Personnel List
HOT 86:
WOCE group:
Fernando santiago-Mandujano Research Associate UH
Craig Nosse* Research Associate UH
Hans Ramm Research Associate UH
Don Wright Research Associate UH
JGOFS group:
Dale Hebel Chief Scientist (co-PI JGOFS) UH
Karin Bjorkman Visiting Graduate Student UH
Dan Sadler Research Associate UH
Chris Carrillo Graduate Student UH
Stuart Donachie Post-Doc UH
Terrence Houlihan* Research Associate UH
Lance Fujieki Computer Specialist UH
Pat Driscoll Research Associate UH
Ancillary projects
Chuck Stump Scientist UW
Rebecca Scheinberg Graduate Student UH
Albert Calbet Post-Doc UH
Marian Westley Graduate Student UH
STAG
Steve Poulos Electronic Technician UH-UMC
Luigi Pozzi Deck Technician UH-UMC
* Watch Leader
Itinerary (approximate local time):
-----------------------------------
Thursday, 31 July
0800 Departed Snug Harbor
0830 Fire and Abandon ship drill
1045 Arrived Kahe Pt. (Sta. 1)
1050 Weight cast (1000m)
1150 PRR-600 cast
1235 s1c1
1445 Departed Kahe
2255 Arrived Aloha (Sta. 2)
2340 Began sediment trap deployment
Friday, 1 August
0025 Completed sediment trap deployment (22 45.4N,158 00.8W)
0048 Plankton net tow
0115 Plankton net tow
0240 IES recovery operation
0510 Winch all stop (6850 m); first pass
0560 Retrieving wire
0700 Winch all stop (4500 m)
0820 Winch all stop (6526); second pass
0900 Retrieving wire
0950 Winch all stop (4500 m)
1110 Winch all stop (6613); third pass
1130 Retrieving wire
1400 First weight onboard
1510 Last weight onboard; first report of capstan slow speed problem
1810 Began 36 hr "burst sampling" (s2c1)
2100 s2c2
2240 Plankton tow aborted, capstan problem
Saturday, 2 August
0000 s2c3
0125 Go-Flo cast
0310 s2c4
0510 Deployed primary productivity array (22 45.1N, 158 00.0W)
0600 s2c5
0700 PP array radio transmitter signal lost
0900 s2c6
1200 s2c7
1315 PRR-600 cast
1345 Plankton net tow
1500 s2c8
1620 Plankton net tow
1800 s2c9
1940 Retrieved primary productivity array (22 46.4N, 158 05.7W)
2100 s2c10
Sunday, 3 August
0005 s2c11
0300 s2c12
0550 s2c13 (WOCE deep cast)
0920 Departed Sta. ALOHA
1210 Sediment trap recovery (22 47.6N, 158 22.2W)
1635 s8c1
1800 OPC deployed
Monday, 4 August
0415 OPC recovered
0710 Arrived Snug Harbor
1130 Completed offloading operations
Narrative:
----------
HOT 86 was conducted aboard the R/V Moana Wave 31 July to 4 August
1997. Captain Stahl was the master of the vessel and Dale Hebel chief
scientist. There were a total of 18 participants in the scientific
party composed of 4 WOCE, 8 JGOFS, 4 ancillary and 2 STAG. This was
not a routine cruise in the respect that the WOCE group wanted to
conduct an IES recovery operation at the beginning of the cruise to
allow enough time to identify if the IES dragging operation was
successful in the event the IES was dislodged and floated to the
surface some time later. This necessitated the initial cancellation of
the OPC operations, although, there was the contingency that if there
was time the operation would be conducted utilizing JGOFS personnel.
Three stations were occupied during HOT 86 at Kahe Pt. (sta. 1),
Station ALOHA (sta. 2), and the surface mooring location (sta. 8). All
scheduled operations were completed with the exception of 2 (?) nets
tows due to intermittent problems with the capstan. All Core samples
were collected in addition to an approximate 12 hr IES dragging
operation in an attempt to recover the IES which did not surface on HOT 85.
Unfortunately, the IES recovery operation was unsuccessful.
During the cruise all underway measurement systems (thermosalinograph,
ADCP, meteorological instruments, pCO2 and fluorometer) were operable
and functioned normally. Experiments on EOC, ectoenzymes and
phosphorus cycling were performed as well as towing of the OPC from the
mooring site (station 8) to off the leeward coast of Oahu. The weather
was moderate with ~ 20 kt Trades, swells 3-6 feet and skies mostly
cloudy.
Daily Activities (HST)
28 July 1997
Pre-cruise meeting MSB 315 at 1100 hrs.
30 July 1997
All equipment and supplies were loaded on the R/V Moana Wave,
assembled, and tested (is this correct?).
31 July 1997
All science personnel were aboard by 0730 hrs and the ship departed on
schedule (0800 hrs.). Completed all work at station Kahe without
problems. We did the usual weight cast to 1000 m, PRR cast, and 1000 m
CTD cast. Chris Carrillo request two bottles for his experiments and
Chuck Stump collected some inter-comparison oxygen and salt (?)
samples. Prior to arriving at Kahe the fire/abandon ship drill was
conducted by first mate Ross Barnes followed by a science meeting. At
the meeting we covered the usual operational plans and reintroduced the
updated CTD protocols, which were made available for personnel to
read. We departed Kahe ~1430 hrs. There was a south wind blowing
causing small white caps and a moderate south swell. Skies were
generally clear but hazy.
We arrived Station Aloha ~2200 hrs. The sediment traps and associated
samples (Chris Carrillo) were deployed without problems followed by two
net tows. The IES recovery operation was started ~0200 hrs and the
complete array deployed ~ 0500 hrs (?) without problems. The dragging
operation progressed as planned and without problems. The winds were
Trades at ~15 kts, the seas choppy with small white caps, swell 4-6 ft
and skies clear. All underway systems are functioned normally.
1 August 1997
Although the IES recovery was unsuccessful the operation went
smoothly. We did experience a problem with the capstan when the low
speed control was lost. Bob Kerr (chief engineer), took a look and
found no obvious problem, however, the unit began to work properly for
no apparent reason. Unfortunately, the problem reappeared during the
night net tow and, as I understand, these operations were aborted (?).
We have begun the 36 hr 3 hr interval "burst" sampling mode. The
series began with the JGOFS 1 cast instead of the usual WOCE deep cast
(WOCE-1). At this point, Chuck Stump has collected most of his samples
and both Stuart and Karin have collected water for their experiments
and the PP array has been deployed although we just lost the RDF
signal.
Winds continue to be Trades at about 20 kts, seas 4-6' and skies mostly
cloudy.
2 August 1997
CTD operations are continuing normally. The go-flo cast was successful
and the PP array deployed without incident although the RDF quit
working shortly after deployment.
The 1030 hr net tows were aborted since the capstan was still
inoperable and the 1330 hr net tows were attempted using the starboard
tugger winch in place of the capstan. Letting the net out was no
problem but during the ascent the continuous tugger operation drained
the air tank and almost killed the engine. At this point we arranged a
block assembly and used the DSE winch to haul in the net.
The PP array was retrieved without incident. The next net tow was
scheduled for 2200 hrs and I understand that this was aborted due to a
problem with the DSE winch. Apparently, the brake would not disengage
properly (we have experienced this before). I am not clear if this
problem occurred immediately or during the retrieval, in which case,
the net would have had to have been retrieved somehow and therefore
samples collected? There is a net tow written in on the schedule at
2230 hrs and no indication if this worked and if so how it was done
(?).
3 August 1997
The net tow scheduled for 0030 hrs was aborted. CTD operations
continue without problems. We have completed the WOCE-2 cast (shallow
cast) and have moved to the new IES location. The IES is functioning
normally and we are now doing the WOCE-1 (deep cast). The winds are
blowing Trades and have dropped to about 15 kts, seas are 2-4' with a
light chop and skies are mostly clear.
Our arrival at Snug Harbor is slated for 0800 hrs 4 August 1997. We
still need to retrieve/process the sediment traps which are drifting
almost due west, tow the OPC, and do our final 1000 m cast at HALE
ALOHA. At this point, all samples have been collected (except for the
net tow samples) and it is anticipated that we will have no difficulty
with the remainder although due to the time frame of the WOCE casts it
is uncertain if all the oxygen samples will be analyzed before our
scheduled docking. If not we will complete these at UH.
4 August 1997
After the station 8 (HALE ALOHA) CTD cast we deployed the OPC and
completed two vertical profiles before towing the instrument at 8 kts
on the return transit to Snug Harbor. We retrieved the OPC somewhere
off the leeward coast of Oahu. We arrived at Snug Harbor 0700 hrs and
completed offloading operations by 1130 hrs.
Weather
-------
HOT 86:
The weather was mostly cloudy with winds and seas typical of
station ALOHA at this time of year. Below is listed the cruise bridge
log descriptions and the various values represent the range for that
day. Under wind, sea, and swell there will be two designations, the
first is the direction (in degrees), the second for wind is in kts, sea
in Beauford force, and swell in feet, barometer in inches of Hg, temp C
(dry bulb) and clouds in tenths.
Day Date Wind Sea Swell Barometer Temp Clouds
Thurs 31 July var-130, 1-21 060-130, 1-4 060-150, 3-6 29.98-30.04 77-88 2-9
Fri 1 Aug. 085-100, 5-10 120-100, 3-4 120-130, 5-6 30.03-30.10 74-76 3-7
Sat 2 Aug. 070-085, 20-28 070-080, 3-4 110,120, 6 30.02-30.08 76-82 1-10
Sun 3 Aug. 065-090, 16-20 065-090, 3-4 090-110, 3-6 29.95-30.06 77-81 5-9
Mon* 4 Aug 060-100, 10-14 060-100, 2 100-160, 3 29.94 76-77 1-5
*Only two entries (0200 & 0600 hrs)
Equipment and methods:
----------------------
With the exception of the initial capstan problems all standard
equipment functioned properly.
Sub component programs:
-----------------------
Investigator: Project:
------------- --------
Christopher Winn (UH) DIC, pH, Alk., pCO2/UH
Bob Bidigare (UH) HPLC pigments/UH
Michael Landry (UH) Zooplankton dynamics/UH
Ancillary programs:
-------------------
Investigator: Project:
------------- --------
Charles Keeling (SIO) CO2 dynamics and intercalibration/SIO
Paul Quay (UW) DIC and 13C/UW
Ed Boyle trace metals/MIT
Bill Jenkins helium distributions/MIT
Steve Emerson oxygen, argon, nitrogen dynamics/UW
others ???
Students:
---------
Others:
-------
Mark Huntley/Mai Lopez Optical plankton counting/SIO
Stuart Donachie Ectoenzyme activities/UH
Karin Bjorkman PO4 dynamics experiments/UH
Dale Hebel EOC distribution/UH
others ???
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