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HOT 49 Cruise Report
R/V Moana Wave
9-17 Sept. 1993
Personnel List:
---------------
Leg 1 Dave Karl Chief Scientist UH
JGOFS group:
Dale Hebel Scientist UH
Louie Tupas Scientist UH
Terry Houlihan Technician UH
Jim Christian Graduate Student UH
Stuart Reid Graduate Student UH
Rich Muller Technician UH
Lance Fujieke Graduate Student UH
Ancillary projects:
Charles Holloway Graduate Student UH - J. Cowen
Observers:
Selima Siddique Student UH
Dave Copson ESF UH
Leg 2 Dale Hebel Chief Scientist UH
WOCE group:
Jeff Snyder Technician UH
Rich Muller Technician UH
Fred Bingham Scientist UH
Fernando S.-Mandujano Scientist UH
JGOFS group:
Chris Winn Scientist UH
Louie Tupas Scientist UH
Ricardo Letelier Graduate Student UH
Terry Houlihan Technician UH
Jim Christian Graduate Student UH
Stuart Reid Graduate Student UH
Ancillary projects:
Lisa Campbell Scientist UH
Hongbin Liu Graduate Student UH - L. Campbell
Charles Holloway Graduate Student UH - J. Cowen
Jinchun Yuan Graduate Student UH - C. Measures
Chuck Stump Scientist UW - S. Emerson
Roberta Hamme Graduate Student UW - S. Emerson
Itinerary (approximate local time):
-----------------------------------
Thursday, 9 Sept. 1993
1500 Departed Snug Harbor (Leg 1), steaming to trap drop-off
point
Friday, 10 Sept.
0200 Arrived trap drop-off point
0450 Completed trap deployment enroute moored trap location
0630 Arrived moored trap location
0720 Array relesed and shallow buoy sighted
0850 Retrieval begun
1300 Retrieval completed
1800 Continuous Water Sampler (CWS) wt. test
1845 CWS-CTD and pump tests
Saturday, 11 Sept.
0800 Began moored sediment trap deployment
1150 Completed moored sed. trap deployment
1640 Visual inspection of floating trap array enroute Snug
1750 Winch wt. cast
1900 Pylon test cast
Sunday, 12 Sept.
0810 Arrived Snug Harbor
0930 Departed Snug Harbor (Leg 2)
1210 Arrived station Kahe
1530 Completed PNF and 1000 m CTD cast, underway station ALOHA
2240 Visual fix floating sediment traps
Monday, 13 Sept.
0030 Arrived ALOHA, commenced net tows
0140 WOCE deep cast
0520 Commenced 36 hr. CTD "burst" sampling
Tuesday, 14 Sept.
0130 Go Flo cast
0510 Primary productivity array deployed
1230 Steaming to dump holding tanks
1440 Resumed CTD operations
1900 Retrieved primary productivity array, completed 36 hr
"burst" sampling
Wednesday, 15 Sept.
0230 Second WOCE deep cast
0640 Completed deep cast
0750 Surface net tow
1620 Surface net tow
2140 Completed station ALOHA CTD ops
Thursday, 16 Sept.
0030 Departed station ALOHA for station 3
0450 Station 3 CTD cast
0600 Began 158 degree transect
1250 Departed from transect line to recover floating
sediment traps
1300 Sighted traps
1500 Completed trap recovery
1610 CWS tests
1940 Continued 158 transect
2120 Arrived station 4
2230 Departed station 4
2330 Arrived station 5
Friday, 17 Sept.
0030 Departed station 5
0050 Began 300 m isobath ADCP bottom tracking enroute Snug
Harbor
0800 Arrived Snug Harbor
Narrative:
----------
HOT 49 was conducted 9-17 September 1993 aboard the R/V Moana Wave with
Capt. Stahl as Master. The cruise was organized into two legs. The
primary goal of the first leg (9-12 Sept., chief scientist - Dave
Karl), was to recover, sample, and redeploy the moored time-series
(T-S) ediment traps and if time permitted to test the CWS. The primary
goal of the second leg (12-17 Sept., chief scientist - Dale Hebel) was
the collection of routine HOT samples and CTD data. Both legs of the
cruise were successful and all samples and data collected. In addition
to the routine data and sample collection on leg 2 a transect was run
down the 158 degree line encompassing statins 3, 4 and 5. CTD casts
were conducted at transect stations and the 300 m isobath followed on
the return to Snug Harbor. The ADCP ran continuously throughout the
cruise with no apparent problems.
Leg 1 departed Snug Harbor approximately 1500 hrs 9 Sept. 1993. We
steamed directly to the southeast quadrant of the circle defining
station ALOHA for the floating array deployment. Enroute a fire and
abandon ship were conducted followed by a science meeting. On station
(see itinerary), the ship drift was southeasterly while the ADCP (upper
100m ?) indicated a southwesterly current. The chief scientist made
the decision to deploy the floating array although there were concerns
the array may enter the Kauai Channel during the 7 day deployment
period. Following a successful deployment we steamed to the moored
sediment traps (see ship's log HOT 49 JGOFS cruise binder for all
coordinates), actuated the acoustic release successfully and retrieved
the array in calm seas. During sampling and reconfiguration of the
array the new Continuous Water Sampler was weight tested followed by a
full test of CTD sensors and pumping ability. It was discovered that
the pump could not be run in conjunction with CTD data
Leg 2 departed Snug Harbor 12 Sept 1993 after dropping off a subset of
Leg 1 participants and boarding additional Leg 2 personnel. The
customary fire and abandon ship drill were performed followed by a
science meeting. It was at the science meeting that the previously run
158 degree transect would be desirable time and conditions permitting.
Since the floating sediment traps were deployed on Leg 1 we steamed to
the center of the circle and began CTD operations following a brief net
tow operation. CTD operations were concluded without major equipment
malfunctions and all data and samples collected during or following the
36 hr "burst" CTD operations. All JGOFS and ancillary investigator
samples were collected at station ALOHA.
We departed station ALOHA for station 3 early Thursday 16 Sept. to
begin the 158 transect. The 158 transect was completed deviating only
for the recovery of the floating sediment trap array and additional
tests of the CWS. The sediment traps have been drifting at
approximately 0.2 kts almost due south slightly off 158 degrees. The
158 transect was completed 0030 hrs 17 Sept. 1993. The return course
followed the 300 m isobath from Kahuku to Snug Harbor arriving at
0800.
Weather:
--------
The weather was good throughout the cruise with light-moderate trades
(10-20 kts), mostly sunny skies, and 1-2 m seas.
Equipment and methods:
----------------------
All equipment used on HOT 49 was standard for past HOT cruises with the
exception of the CWS. The CTD related equipment functioned properly,
however, the CWS was unable to pump water and transmit CTD data
simultaneously due to current leakage. The JGOFS incubators could not
hold the requied temperature due to a malfunction of the refrigeration
component The PNF had an intermittent short which was resolved (at
least for the short-term) on board.
Ancillary programs:
-------------------
Investigator: Project:
------------- --------
Charles Keeling (SIO) CO2 dynamics and inter calibration
Lisa Campbell (UH) Picoplankton studies
Steve Emerson Phytoplankton respiration
experiments
Paul Quay DIC dynamics
Hans Thierstein Coccolithophore studies
Students (UH):
--------------
Ricardo Letelier Tricodesmium studies
Jim Christian Exoenzyme studies
Chuck Holloway Th-U disequilibria and marine snow
dynamics
Jinchun Yuan Trace metal studies
Honbin Liu Picoplankton studie
Others:
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Last modified: January 00, 1998