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HOT 79 Cruise Report
R/V Moana Wave
6-10 Jan. 1997
Personnel List
HOT 79:
WOCE group:
Jefrey Snyder* Mar. Electronic Tech. UH
Craig Nosse Research Associate UH
Holly Dail Volunteer UH
Shuiming Chen Graduate Student UH
Mike Guidry Graduate Student UH
Don Wright Volunteer UH
JGOFS group:
Dale Hebel Chief Scientist (co-PI JGOFS) UH
Pat Driscoll Research Associate SIO
Karin Bjorkman Scientist UH
Dan Sadler* Research Associate UH
Ursula Magaard Research Associate UH
Lance Fujieki Computer Specialist UH
Ancillary projects
Mai Lopez Scientist SIO
Stephanie Chirstensen Graduate Student UH
Beth Holmes Post Doc UH
STAG
Will Hervig Electronic Technician UH-UMC
Dave Gravatt Deck Technician UH-UMC
* Watch Leader
Itinerary (approximate local time):
-----------------------------------
Monday, 6 Jan.
0840 Departed Snug Harbor
1110 Arrived Kahe Pt. (Sta. 1)
1120 Weight cast (1000m)
1210 PRR-600 cast
1250 s1c1
1400 Departed Kahe
2150 Arrived Aloha (Sta. 2)
2215 Deployed OPC
Tuesday, 7 Jan.
0110 Recovered OPC
0140 Plankton net tow
0330 Completed sediment trap deployment (22 44.93N,157 59.36W)
0410 Arrived Aloha (center of circle), WOCE deep cast (s2c1)
0730 CTD on deck
0910 Began 36 hr "burst sampling" (s2c2)
1020 Plankton net tow
1210 s2c3
1310 PRR-600 cast
1340 Plankton net tow
1500 s2c4
1800 s2c5
2100 s2c6
2220 Plankton net tow
Wednesday, 8 Jan.
0000 s2c7
0100 Plankton net tow
0150 Go-Flo cast
0310 s2c8
0540 Deployed primary productivity array (22 45.7N, 157 58.9W)
0610 s2c9
0950 s2c10
1050 Plankton net tow
1130 PRR-600 cast
1205 s2c11
1315 Plankton net tow
1500 s2c12
1800 Retrieved primary productivity array (22 44.7N, 158 06.4W)
1830 s2c13
2150 s2c14
2230 Completed "burst" sampling
Thursday, 9 Jan.
0800 Sediment trap recovery (22 44.3N, 157 57.9W)
0915 OPC deployed
1915 OPC recovered
1930 Departed Sta. ALOHA
Friday, 10 Jan.
0715 Arrived Snug Harbor
1330 Completed offloading/onloading operations
Narrative:
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HOT 79 was conducted 6-10 Jan. 1997 aboard the R/V Moana Wave with
Capt. Hayes as Master. All over-the-side operations were completed and
all samples collected with the exception of the second WOCE deep cast
which was canceled due wire twisting/kinking problems. Again, the trap
array remained within the confines of the station boundary drifting ~ 3
nm from the dropoff to pickup point. The overall drift pattern appears
to be circular, first drifting east, then northeast, then west and
finally picked up in the southeast quadrant of the circle. Sea
conditions were generally good although there was a large swell which
caused snap loads on the new CTD wire resulting in two terminations.
The OPC was towed both on the initial occupation of Station ALOHA and
after recovery of the floating sediment traps within the Station ALOHA
circle until it was necessary to begin the return transit (see above).
We arrived Snug Harbor on 10 Jan. and began H79 offloading and H79b
(Mooring Cruise) onloading.
Weather:
--------
The weather was mostly sunny 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 mercury, temp
C and clouds in tenths.
Day Date Wind Sea Swell Barometer Temp Clouds
Mon 6 Jan. 275-310, 10-14 275-310, 2-3 340, 3-5 29.82-29.87 72-74 2-7
Tues 7 Jan. 230-320, 4-20 230-320, 1-4 310-340, 3-8 29.83-29.98 70-75 0-8
Wed 8 Jan. 140-230, 5-18 140-230, 1-3 300, 4-8 29.95-30.04 70-75 0-4
Thur 9 Jan. 020-260, 10-23 020-260, 2-4 300-320, 6-8 29.99-30.09 70-72 2-10
Fri* 10 Jan. 040-060, 12-20 040-060, 3 140-320, 1-8 30.03-30.06 71 3-4
*Only two entries (0200 & 0600 hrs)
Equipment and methods:
----------------------
In general, all standard equipment used on HOT 79 functioned properly
with the exception or comments listed below:
1). Removed ~50 lbs of weight from sediment trap spar buoy because it
was riding too low in the water.
2). PRR-610 logging program was unoperable. Appears to be software problem.
3). The brake on the DSE winch did not appear to release properly.
4). CTD cable kept twisting and "snap" loads kinked cable twice.
5). CWS (OPC) pump did not operate properly.
6). Altimeter did not work properly again.
7). Inaccurate ship position during some met. obs.
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 intercalibration
Paul Quay (UW) DIC and 13C
Students:
---------
Others:
-------
Mark Huntley/Mai Lopez Optical plankton counting
Karin Bjorkman Ectoenzyme activities
Beth Holmes CH4 studies
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Last modified: January 00, 1998