HOT-50: Chief Scientist Report

Chief Scientist: L. TUPAS

Cruise Dates: 27 October - 1 November 1993
Vessel: R/V Moana Wave
Operator: University of Hawaii
Master: Captain John Stahl
Marine Technician: Dave Gravatt
Electronics Technician: Will Hervig



SCIENCE PERSONNEL:

	Luis Tupas - UH Scientist, JGOFS
	Dale Hebel - UH Scientist, JGOFS
	David Bird - UH Scientist, JGOFS
	Terrence Houlihan - UH Technician, JGOFS
	John Dore - UH Graduate Student
	James Christian - UH Graduate Student
	Fernando Santiago-Mandujano - UH Scientist, WOCE
	Jefrey Snyder - UH Technician, WOCE
	Ron Bregman - UH Graduate Student, WOCE
	Richard Muller - UH Technician, HOT
	Daniel Sadler - UH Graduate Student, Carbon Project
	Mike Rand - UH Technician, Carbon Project
	Karen Selph - UH Graduate Student, Zooplankton Project
	Hong Bin Liu - UH Graduate Student, Phytoplankton Project
	Jin Chun Yuan - UH Graduate Student, Trace Metal Project
	Charles Holloway - UH Graduate Student, Thorium Project
	Anna Farrenkopf - U. Delaware Graduate Student, Iodine Project
	Dave Gravatt - UH Marine Center, STAG
	Will Hervig - UH Marine Center, STAG





GENERAL SUMMARY

All objectives of the JGOFS and WOCE programs were accomplished. All
core samples were taken and the 36 hour CTD burst sampling period was
maintainedwithout interruption. All samples for ancillary projects were
taken. Floating sediment trap and primary production arrays were
succesfully deployed and recovered, no samples were lost during the
in-situ incubation. Except for the continuous water sampler there were
no equipment failures. WOCE electronic technician Jefrey Snyder
slightly injured his right index finger from a tag lineabrasion. The
wound was immediately treated by the Captain.



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 accomodate our operational demands. The
officers and crew were most helpful and accomodating. 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

27 October 1993
	
All hands arrived on ship at 0730. Scheduled departure for 0800 was
delayed to 0900 because of heavy ship traffic in the waterway. Underway
at 0900.Fire and emergency drills conducted at 0945 followed by safety
briefing by chiefmate. Arrived Kahe Point Station at 1200. Conducted
weight cast, PNF cast and 1000 m CTD cast. Jeff Snyder received
superficial injury during deployment of CTD. Treated immediately by the
Captain. All operations and sampling accomplished by 1700. Deployed
surface water sampler while getting underway, test was marginally
succesful. Transit to Station ALOHA. Encountered moderate showers
andmoderate seas during transit.


28 October 1993

Arrived center of ALOHA station at 0100. Moderate sea state. Shallow
CTDcast for Dore and Christian conducted at 0130, accomplished by 0230.
Commneced with sediment trap array deployment at 0300, finished
deployment at 0500 due to additional crosses for Dore, Christian and
Holloway and bottles by Dore and Liu.Transit to center of station and
commenced WOCE deep cast at 0615. PNF cast at 1115. CTD burst sampling
commenced at 1130. CTD casts maintained at 3 hour intervals. Sea state
moderate to heavy. Passing showers encountered.


29 October 1993

CTD cast continued at 3 hour intervals. Go-Flo cast conducted at 0130,
finished at 0230. Zooplankton tow using starboard crane conducted at
0230 while sampling of Go-Flo bottles. Primary production array
deployment commenced at 0600, accomplished at 0645. CTD casts continued
at 3 our intervals. PNF cast andzooplankton tow conducted at 1200.
Retrieval of primary production array commenced at 1745. Retrieval
required 3 attempts but was succesful and no samples were lost. CTD
casts continued at 3 hour intervals. Burst sampling period finished at
2330. Zooplankton tow at 0000. Continue CTD casts for experiments.


30 October 1993

CTD casts continue for special projects. Work suspended from 0530 to
0700 to pump tanks outside Station ALOHA. Zooplankton tow and PNF cast
conductedat noon. CTD worked continues with final deep cast
accomplished at 1500.  Preparations for continuous water sampler
commence, package in water at 1600.  Encountered problems with water
sampling pump, retrieved package for inspection.Water sample package
redeployed at 1800, problems still persist, retrieve package for
inspection and repair. Problem still not isolated by 2000.  Proceeding
to Station 3.


31 October 1993

Arrive Station 3 at 0000. Commenced with zooplankton tow. Problems with
continuous water sampler appear to have been fixed. Sampler package in
water at 0030. Pump and CTD package appear to be working well, however,
water sample stream heavily laden with particulate matter. Continue
pumping to see if water clears. Stop pumping at 0300 without clearing
water line. CTD cast conducted andaccomplished at 0400. Proceed to
location of sediment traps traveling along 158 W and turining west to
trap location. Trap retrieval commenced at 1100 and accomplished at
1245. Return to 158 W and continue transit south. Finish transitat 22
N, 158 W and break off to Kaena Point Station. CTD cast at Kaena Point
station at 2300.


1 November 1993

CTD cast at Kaena Point Station accomplished at 0000. Proceed to Snug
Harbor and arrive at 0700. Commenced offloading, all equipment and
personnel cleared from ship at 1100.


ANCILLARY INVESTIGATIONS AND SPECIAL PROJECTS

1. Zooplankton sampling - K. Selph
2. Trace metal sampling and analysis - J. Yuan
3. Marine virus sampling - D. Bird
4. Nitrogen fixation experiments - J. Dore
5. Bacterial exoenzyme experiments - J. Christian
6. Microbial grazing experiments - H. Liu
7. Thorium sampling - C. Holloway
8. Iodine sampling - A. Farrenkopf
9. Alkalinity, pH measurements - D. Sadler. M. Rand


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. DIC samples for C. Winn, UH