HOT-52: Chief Scientist Report

Chief Scientists: D. HEBEL (officially), L. TUPAS (unofficially)

Cruise Dates: February 15-20, 1994
Vessel: R/V Moana Wave
Operator: University of Hawaii
Master: Captain Robert Hayes
Deck Operations: Clary Getzeit
Electronics Technician: Will Hervig

SCIENCE PERSONNEL:

	Dale Hebel - UH Scientist, JGOFS
	Luis Tupas - UH Scientist, JGOFS
	David Pence - UH Technician, JGOFS
	Ursula Magaard - UH Technician, JGOFS
	Lance Fujieki - UH Technician, JGOFS
	John Dore - UH Graduate Student, JGOFS
	Jefrey Snyder - UH Technician, WOCE
	James Potemra - UH Graduate Student, WOCE
	Richard Muller - UH Technician, HOT
	Amy Baylor - UH Graduate Student
	Christopher Winn - UH Scientist, Carbon Project
	Karen Selph - UH Graduate Student, Zooplankton Project
	John Constantinou - UH Graduate Student, Zooplankton Project
	Hong Bin Liu - UH Graduate Student
	Jin Chun Yuan - UH Graduate Student, Trace Metal Project
	Stewart Reid - UH Graduate Student
	Louise Schlüter - UH Visiting Student

GENERAL SUMMARY

All objectives of the JGOFS and WOCE programs were accomplished. All
planned stations were occupied. All core samples were taken and the 36
hour CTD burst sampling period was maintained without interruption. All
samples for ancillary projects were taken.  Floating sediment trap and
primary production arrays were successfully deployed and recovered, no
samples were lost during the in-situ incubation. There were no major
equipment failures. The continuous water sampler, water transfer
system, and surface water sampler were deployed and recovered without
incident.



R/V MOANA WAVE, OFFICERS AND CREW, TECHNICAL SUPPORT

The R/V Moana Wave continues to be the most suitable platform for our
work. Even as the program continues to expand its range of activities,
the ship is still able to accommodate our operational demands. The
officers and crew were most helpful and accommodating. They showed
enthusiasm and concern for our work and were very flexible in receiving
changes in our operational schedule. Technical support during this
cruise was excellent. STAG personnel were available at any time to
assist in our work and made things much easier for us.


DAILY REPORT OF ACTIVITIES

February 15,  1994
	
All hands arrived on ship at 0830. Ship departed at 0900. Fire and
emergency drills conducted at 0945 followed by safety briefing by first
mate. Arrived Kahe Point Station at 1130. Conducted weight cast, PNF
cast and 1000 m CTD cast. All operations and sampling accomplished by
1400. Transit to Station Kaena. Arrive Station Kaena at 1715. Conduct
CTD to near bottom, completed at 1915, slowly started transit to
Station ALOHA while sampling.  Encountered moderate showers and
moderate seas during transit, heavy overcast.

February 16, 1994

Arrive at eastern edge of Station ALOHA at 0130. Moderate sea state.
Shallow CTD cast for WTS positioning conducted at 0145, accomplished by
0215. Transit to center of station and commenced with sediment trap
array deployment at 0530, finished deployment at 0645.  Transit to
center of station and commenced WOCE deep cast at 0800. PNF cast at
1200. CTD burst sampling commenced at 1400. CTD casts maintained at 3
hour intervals. Sea state moderate to heavy. Passing showers
encountered.

February 17, 1994

CTD cast continued at 3 hour intervals. Go-Flo cast conducted at 0100,
finished at 0230. Primary production array deployment commenced at
0530, accomplished at 0600. CTD casts continued at 3 our intervals. PNF
cast and zooplankton tow conducted at 1200. Retrieval of primary
production array commenced at 1830. No samples were lost. CTD casts
continued at 3 hour intervals. Zooplankton tow at 0000. Continue CTD
casts for experiments.

February 18, 1994

Burst sampling period finished at 2330. CTD casts continue for special
projects.  Zooplankton tow and PNF cast conducted at noon. CTD worked
continues with final deep cast accomplished at 1700. Preparations for
continuous water sampler commence, package in water at 1800. Work
suspended at 2000 to pump tanks outside circle. Continue CWS test at
2100. Encountered problems with water coming out of sampling pump,
problems still persist despite continous pumping.

February 19, 1994

CWS test terminated at 0100. Commenced with zooplankton tow. Underway
at 0215.  Planned pick-up of sediment trap array aborted due to
non-functioning strobe lights. Proceed to Station 3. Arrive Station 3
at 0600. Commence CTD cast 0630. Proceed to sediment traps at 0730.
Sediment trap recovery commenced at 1100, accomplished at 1200. PNF
cast conducted followed by zooplankton tow. Deploy CWS at 1300 and
continue pumping to see if water clears. Stop pumping at 1700 without
clearing water line, retrieve CWS. Surface water sampler deployed and
underway at 1800. Return to 158 W and continue transit to Kahuku.

February 20, 1994

Finish transit at 0100 and break off. Proceed to Snug Harbor and arrive
at 0800.  Commenced off loading, all equipment and personnel cleared
from ship at 1230.


ANCILLARY INVESTIGATIONS AND SPECIAL PROJECTS

1. Zooplankton sampling - K. Selph, J. Constantinou
2. Trace metal sampling and analysis - J. Yuan
3. Hydrogen peroxide sampling - D. Pence, L. Tupas
4. Nitrogen measurement - J. Dore
5. DIC sampling - C. Winn
6. Microbial grazing experiments - H. Liu


SAMPLES TAKEN FOR OTHER INVESTIGATORS

1. DIC samples for C.D. Keeling, SIO-UCSD
2. DIC samples for P. Quay, UW
3. Silica samples for H. Thierstein, Zurich
4. Pigment samples for R. Bidigare
5. Iodine samples for G. Luther