HOT-45: Chief Scientist Report

Chief Scientist: L. TUPAS

Cruise dates: February 15-20, 1993
Vessel: R/V Thomas G. Thompson, University of Washington
Master: Captain Ray Womack
Chief Marine Technician: Bill Martin
Marine Technician: Floyd Makrowski

Scientific Personnel List:

Luis Tupas - UH Scientist
Dale Hebel - UH Scientist
Marlin Atkinson -UH Scientist
Steve Emerson - University of Washington Scientist
Terrence Houlihan - UH Technician
Richard Muller - UH Technician
Desmond Walsh - UH Technician
John Dore - UH Student
James Christian - UH Student
Daniel Sadler - UH Student
Sean Kennan - UH Student
Hongbin Liu - UH Student
Jinchun Yuan - UH Student
Paul Troy - UH Student
Charles Holloway - UH Student
Daniel Hoover - UH Student
Steven Evans - UH Student

General Summary

All objectives of JGOFS and WOCE programs were accomplished.
Additionally the cruise supported related and unrelated scientific
projects which were also successfully accomplished.  Students were able
to obtain the water samples they needed and perform their experiments
on ship without affecting the required core sampling. There were no
injuries or illnesses to science personnel. All equipment functioned
properly. We did, however, damage the cap of 1 and lose 4 Scripps
bottles attached to the rosette during Cast 2-12. This was caused by
the swinging of the package inboard during the upcast just before it
was brought on deck. It is not certain whether this was due to
negligence on the part of the winch operator or mate on watch or an
unavoidable circumstance which none of those on ship could correct fast
enough to avoid the accident. In an unrelated incident one Scripps
bottle was found cracked after cast 1-1. It is uncertain whether the
bottle was damaged prior to any operation of this cruise or during the
cast itself. In general, however, the cruise was successful in all
aspects and there were no major problems.  For those interested, a copy
of the ship's log and data gathered by the ship marine technicians can
be obtained from the chief scientist

R/V Thomas G. Thompson, officers, crew members and technicians

The ship was more than adequate to support the operations.  There was
no shortage of laboratory space and all science personnel found more
than enough space to do their work. The laboratory vans and deck
incubator were well situated at the stern with sufficient electrical
power. Winches and cranes were able to handle the planned CTD, box core
and water sampling operations and the deployment and retrieval of
floating arrays.

The ship personnel were very helpful during loading and offloading of
our equipment and providing technical and operational support to our
activities. They showed genuine concern for our personal safety and the
successful accomplishment of our objectives. They cooperated with the
science party in all scientific and logistical aspects of the cruise.
The science party in return complied with all ship rules and
regulations.


Daily report of activities

February 15, 1993

All personnel arrived between 0600 and 0630 H to avoid the closing of
Nimitz Highway due to the ALOHA Run which took place that early
morning. Some personnel stayed overnight at the ship.  Scheduled
depature was 0800 H but due to traffic in the waterway, we departed at
0830 H. A science meeting with the ship marine technicians was held in
the library at 0800 H. After personal introductions and short
descriptions of the core and other projects, the science party was
briefed on rules regarding science and living operations. All those who
brought hazardous chemicals filled out the necessary ship forms.

We arrived at Kahe Station (21 deg. 20.6'N, 158 deg. 16.4'W) at 1100 H.
The test weight cast, PNF cast, and CTD cast 1-1 were successfully
conducted. One Scripps bottle was found to have a crack and was
replaced. We left Kahe Station at 1500 H. A meeting with the captain
was held at 1500 H and we were given more specific guidelines for
working on ship. A fire drill was held at 1600 H.

We arrived at the northeast portion of Station ALOHA (22 deg.
51.498'N, 157 deg. 54.146'W) at 2130. Sediment trap array was
immediately deployed and accomplished at 0015 H, Feb. 16.


February 16, 1993

Immediately following sediment trap deployment Niskin bottle casts
using the Kevlar line was done for Steve Emerson at 0015 H.  We
proceeded to the center of the circle at 0105 H and arrived at 0230.
CTD cast 2-1 commenced at 0240. Succeeding CTD casts were conducted as
scheduled. At 1515 H we left ALOHA and travelled east about 2 nautical
miles from the edge of the circle to dump garbage. We returned to the
center of Station ALOHA and continued scheduled CTD operations at 1730
H. All WOCE and GOFS water sampling were accomplished today.

February 17, 1993

The Go-Flo cast was conducted at 0100 H and accomplished at at 0230 H.
CTD operations continued as scheduled while primary production
experiment and array was being prepared. Primary production array was
deployed at 0430 and accomplished at 0530 H.  Ship remained within site
of array. CTD operations continued as scheduled. On CTD cast 2-12,
Scripps bottles were lost during the return of the package (see general
summary). Package is inspected and bottles adjusted. CTD casts continue
as scheduled without delay. After cast 2-13 primary production array
retrieval begins and ends at 1900 H. All bottles retrieved. Ship
transects to center of circle to continue CTD operations.

February 18, 1993

CTD casts continue. An extra cast (2-17) is conducted to make up for
the water samples lost during cast 2-12. We proceed to area of sediment
trap array at 0400 and catch sight of it at 0630 H. The sediment trap
array drifted northeast from the point of deployment. We proceed with
Marlin Atkinson's first deep CTD cast. This is followed by a box core
(23 deg. 06.70'N, 157 deg. 42.05'W).  Second of Atkinson's cast
conducted at 1545 followed by second box core (23 deg. 12.63'N, 157
deg. 37.68'W). Box coring finished at 2345 H. Ship manuevers to
retrieve sediment trap.

February 19, 1993

Sediment trap retrieval begins at 0030 H and accomplished at 0300. All
traps retrieved. Single bottle Niskin cast for Steve Emerson conducted.
We proceed with Sean Kennan's CTD survey at his specified locations.
CTD survey starts at 0415 and ends at 2230. Single bottle cast for S.
Emerson conducted as final ship scientific operation. We proceed to
Honolulu at 2300 H.

February 20, 1993

Arrive and secure at snug Harbor at 0730 H. Offloading of equipment
proceeds immediately and smoothly. Offloading complete and all
equipment at University of Hawaii at 1230 H.


Other projects conducted

1. Marlin Atkinson; calibration of new oxygen sensor for CTD.

2. Steve Emerson; inorganic carbon and oxygen isotopic measurements in
   seawater, microbial respiration experiments.

3. Desmond Walsh, Daniel Hoover; benthic biology studies of deep-sea
   sediments using box core.

4. John Dore; denitrification studies at Station ALOHA

5. James Christian; microbial enzymatic studies at Station ALOHA.

6. Hongbin Liu; bacterial growth inhibition experiments.

7. Jinchun Yuan; dissolved iron measurments at Station ALOHA.

8. Paul Troy; carbonate dissolution experiments, used and extended
   sediment trap line.

9. Charles Holloway; thorium measurements in the water column and
   sediment trap material, additional sediment traps deployed on GOFS
   lines.

10. Sean Kennan; spatial CTD survey of Hawaiian waters.

11. Luis Tupas, Dale Hebel, Terrence Holihan; bacterial production
    experiments using radiolabelled leucine, ultraviolet light
    photolysis of dissolved organic phosphorous compounds.

12. Daniel Sadler; inorganic carbon, pH and pCO2 measurements at 
    Station ALOHA 


Samples taken for ancillary and other projects

1. Paul Quay, Univ. of Washington; water samples for DIC measurements.

2. Charles Keeling, Scripps, UCSD; water sampples for DIC
   measurements.

3. Lisa Campbell, Univ. of Hawaii; samples for flow cytometric analysis
   of microorganisms, collected by H. Liu.

4. Brian Midson, Univ. of Hawaii, HURL; 1000 m water.