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Hawaii Ocean Time-series (HOT)
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HOT-55: Chief Scientist ReportChief Scientist: D. HEBEL
HOT 55
Cruise Report
R/V Moana Wave
23-28 July 1994
Personnel List:
---------------
Dale Hebel Chief Scientist UH
WOCE group:
Jefrey Snyder Technician UH
Debra Schulman Graduate Student UH
Fernando S-Mandujano Scientist UH
Bill Weber Visiting Engineer ASA
JGOFS group:
Dale Hebel Scientist UH
Ursula Magaard Technician UH
Jim Christian Graduate Student UH
Terry Houlihan Technician UH
Louie Tupas Scientist UH
Lance Fujieki Technician UH
Renate Scharek Postdoc UH
Karen Casciotti REU UH
Ancillary projects:
Christopher Winn Scientist UH-Carbon Progam
Mike Landry Scientist UH-Zooplankton Program
Karen Selph Technician UH-Zooplankton Program
Brian Popp Scientist UH-Isotope Biogeochemistry
Payal Parekh REU UH-Isotope Biogeochemistry
STAG
Luigi Pozzi Technician UH-UMC
Ken Shultis Technician UH-UMC
Itinerary (approximate local time):
-----------------------------------
Saturday, 23 July
0900 Departed Snug Harbor
1200 Arrived Kahe Pt. (Sta. 1-1)
1300 PNF cast
1600 Departed Kahe
1900 Arrived Kaena Pt. (Sta 1-2)
2200 Departed Kaena Pt.
Sunday, 24 July
0300 Arrived Aloha (Sta. 2) trap deployment site
0600 Completed sediment trap deployment
0800 Arrived Aloha (center of circle), WOCE deep cast
1300 PNF cast
1400 Emergency medical evacuation
1430 Start 36 hrs 'burst sampling'
2300 Net tow
Monday, 25 July
0130 Go-Flo cast
0700 Deployed primary productivity array
1130 Net tow
1300 PNF cast
1900 Retrieved primary productivity array
2300 Net tow
Tuesday, 26 July
0300 Completed "burst" sampling
0400 Began ancillary work
1200 Net tow
1300 PNF cast
2400 Capstan incident
Wednesday, 27 July
0100 Second WOCE deep cast
1000 Recovered sediment traps
1430 Arrived station 3
1600 Departed station 3
Thursday, 28 July
0700 Arrived Snug Harbor
1100 Offloaded
Narrative:
----------
HOT 55 was conducted 23-28 July 1994 aboard the R/V Moana Wave (full
5 days at sea) with Capt. Stan Winslow as master. The cruise was
postponed one day due to the uncertainty in the projected course of
hurricane Emilia which, at one time, was rated as a category 5
hurricane (the most powerful). There was a number of events that
were atypical of routine HOT cruises. These included 1) Fernando's
eye injury, 2) medivac of crew member, 3) minimal sediment trap
travel, and 4) capstan incident. Irrespective of these events all
core samples were collected and all CTD operations completed.
We departed Snug Harbor 23 Jan. after a one day delay due to
hurricane Emilia followed by the routine lifeboat and fire drill. A
short science meeting followed to delineate the cruise plan, watches,
core work and ancillary projects. At Kahe we conducted a weight cast
to 500m followed by a PNF cast and 1000 m CTD cast. Jeff also
requested that we do a bottom depth determination prior to each CTD
cast. The idea was to generate detailed bathymetry of station ALOHA
over time. I do not know if this was adhered to since, later in the
cruise, Fernando made the point that we return to the center of the
circle prior to each cast (except during the primary productivity day
when we follow the array). Therefore, most of the data would be at
the center of the circle.
At Kaena Fernando sustained an injury above his left eye when his
hands slipped off the bottom water bottle cap, while cocking the
rosette, throwing him off balance and into the bottle spigot.
Following the Kaena Point station we steamed to station ALOHA and
deployed the sediment traps near the center of the circle. We had 9
crosses with 86 traps between the depths of 80-520 m. The array
traveled approximately 6 nm in 75 hrs (straight line from deployment
to retrival point), in a SW direction and was periodically sighted by
the bridge during CTD operations. I understand that, at times, they
manuvered the ship to avoid a possible encounter.
Stan notified me after the trap deployment, in passing, that one of
the crew members (Brian) was passing some blood when he urinated. He
contacted medical personnel and one possibility was a rupture blood
vessel which is not a life threatening condition. Louie woke me at
~1100 hrs and told me the same story and that we were going to head
in to Kahuku where he was to be evacuated. I spoke with Stan and at
that time he was making arrangements for an air evac with the Coast
Guard. This all transpired during the deep cast. When Louie awoke
me it was on the way up. There was also some electrical problem with
the winch when the chief engineer (Bill Lefleur) started up the stern
capstan. It appears that we cannot operate the capstan and winch
simultaneously. Prior to the helicopters arrival (about 45 min-1 hr
transit) we mustered on the 02 deck to watch the evacuation
operations. Many 35 mm still pictures were taken and Fernando and
Bill Weber took some videos although condensation developed on
Fernando's camera and he doesn't know how much he captured.
We deployed the primary productivity array with the net
haul line since we discovered that the regular line was not aboard.
The spreader bars and dark bags were attached by means of two tie
wraps attached at the three points at the appropriate depth. We
recovered the PP array without difficulty, however, the bag
containing the dark bottles at 5 m was missing with all three
bottles. Fortunately, all light bottles were still secured. At all
other depths all samples were accounted for. We split all the light
bottle samples into 0.2 um and GF/F fractions (dark bottles were not
split). One hundred ml was subsampled for the 0.2 um and the
remainder filtered thru GF/F as in HOT 46.
At approximately 2400 hrs on Tuesday 7/26/94 the capstan was powered
up for the scheduled net tow. The capstan must have been engaged
since at power up it pulled the 1 ton (?) lead weight which supports
and secures the block into the capstan. In the process it ran into
the stainless steel electrical housing and then into the electrical
motor crushing the electrical box. This shorted out the electrical
motor but maybe not before it fried itself. I understand Bill Weber
was the first to notice it and called the bridge. This all occurred
when no one was on deck which is fortunate. Karen and Mike were in
the process of preparing the data logger for their net tow when the
incident occurred. This incident resulted in the loss of 2 net
tows. Six had been scheduled and 4 were completed, 2 during the day
and 2 at nite. Mike and Karen made the decision to forego additional
net tow efforts. There should be an on/off switch located on the
capstan (now it is located somewhere else) in additon to the
forward/reverse controls to avoid a recurrence of this dangerous
problem.
After completing all scheduled work (except for net tows) at station
ALOHA we steamed to station 3. We conducted a 1000 m CTD cast and
immediately departed steaming directly to Snug Harbor. There was not
enough time to make the return 158 Kahuku transit.
Weather:
--------
The weather was mostly overcast the first three days with typical 20
kt NE trades and 2-4 m seas. Skies cleared a bit on the final 2 days
but wind and seas did not improve.
Equipment and methods:
----------------------
All equipment was standard for regular HOT cruises although we did
bring Dave's lab van. We lost the use of the stern capstan at the
end of day 4 and lost one go- flow bottle (#8) during removal from
the line.
Sub component programs:
-----------------------
Investigator: Project:
------------- --------
Christopher Winn (UH) DIC, pH, Alk., pCO2
Bob Bidigare (UH) HPLC pigments
Michael Landry (UH) Zooplankton dynamics
Ancillary programs:
-------------------
Investigator: Project:
------------- --------
Charles Keeling (SIO) CO2 dynamics and inter calibration
Paul Quay (UW) DIC and 13C
Hans Thierstein (Zurich) Calcareous plankton dynamics
George Luther (UD) Iodine speciation
Students:
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Jim Christian Role of bacteria in biogeochemical
cycling and fluxes
Karen Selph Zooplankton dynamics
Karen Casciotti Dissolved RNA studies
Others:
-------
Brian Popp Isotope geochemistry studies
Karen Selph for Chris Measures Trace metal samples
Karen Selph for Lisa Campbell Picoplankton time-series ( ?)
Renate Scharek Biogeochemistry of silica
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