HOT-53: Chief Scientist Report

Chief Scientist: R. LUKAS (summary written by L. TUPAS)

Loading: March 5, 1994 
Departed: March 7, 1994 at 0900 
Returned: March 12, 1994 at 0630 
Vessel: R/V Moana Wave 
Operator: University of Hawaii
Chief Scientist: Dr. Roger Lukas 
Master: Captain Robert Hayes 
Deck Operations: Mr. Winston Warr 
Electronics Technician: Mr. Will Hervig
Computer Technician: Ms. Sharon Stahl

1.      SCIENTIFIC OBJECTIVES

The primary objective of the cruise was to maintain the collection of
hydrographic and biogeochemical data at the Hawaii Ocean Time-series
(HOT) station. The HOT station, also known as Station ALOHA (A Long
Term Oligotrophic Habitat Assessment) is defined as a circle with a 6
nautical mile radius centered at 22o45'N, 158oW.  Free- drifting
sediment traps were planned for deployment for approximately 72 hours
from the site to measure sedimentation rates of particulate matter. CTD
casts at three hour intervals were planned to obtain temperature,
salinity, dissolved oxygen, flash fluorescence and beam attenuation
profiles. Water samples for analysis of dissolved nutrients, gases, and
biomass were to be collected with the CTD casts.  Another free-drifting
array to conduct a primary production experiment was planned for a 12
hour deployment. Three other stations were planned to be occupied
during this cruise; Kahe Point Station (21o20.6'N, 158o16.4'W), Kaena
Point Station (21o50.76'N, 158o21.84'W), and Station 3 (23o25'N,
158oW). Other research objectives such as the collection of water
samples for ancillary investigations and experiments were to be
conducted as time permitted. Throughout the cruise underway data from
sensors mounted on the bow shall be collected.


2.      SCIENCE PERSONNEL

	Roger Lukas - UH WOCE 
	Jefrey Snyder - UH, WOCE 
	Fernando Santiago-Mandujano - UH, WOCE 
	Richard Muller - UH, WOCE 
	Luis Tupas - UH, JGOFS 
	Dale Hebel - UH, JGOFS 
	Terrence Houlihan - UH, JGOFS 
	David Pence - UH, JGOFS 
	Karin Bjorkmann - UH, JGOFS
	Daniel Sadler - UH, Carbon Project 
	Karen Selph - UH, Zooplankton Project 
	Christopher Measures - UH, Trace Metal Project 
	Alexander Soloviev - Shirshov Inst. Oceanol.  
	Anatoliy Arjannikov - Shirshov Inst. Oceanol.


3.      GENERAL SUMMARY

All objectives of the JGOFS and WOCE programs were accomplished.
Stations Kahe, Kaena, ALOHA and Station 3 were occupied. Cast at Kahe
was aborted due to errors in temperature sensor and was accomplished on
way back to Honolulu. All core samples were taken within the 36 hour
CTD burst sampling period. All samples for ancillary projects were
taken. The floating sediment trap and primary production experiment was
conducted. Zooplankton net tows were conducted. A free rising profiler
was deployed and retrieved as time permitted. All planned activities
were conducted successfully.


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

The R/V Moana Wave continues to maintain the excellent ship support for
our work. The assistance in preparing the bow frame sensors was most
commendable. The officers and crew were most helpful and constantly
concerned about the success of our work. 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.


5.      DAILY REPORT OF ACTIVITIES

March 5, 1994; Loading Day

All equipment was moved from either SNUG Harbor labs or UH that day.
All electrical and electronic connections were made for the CTD.  All
lab equipment were stowed away and secured. All instruments were tested
and appeared functioning. The bow frame and associated sensors were
also installed. No problems were encountered. A day of rest in between
loading and departure is most welcome.

March 7, 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 1200. Conducted weight cast, PNF
cast and 1000 m CTD cast. Problems encountered with CTD cast, cast
aborted and ship proceeds to Kaena. Bow sensors deployed, all systems
functioning. Surface water sampler towed to station. Arrive Station
Kaena at 1700. Conduct CTD to near bottom, completed at 2000, slowly
started transit to Station ALOHA while sampling. Surface sampler towed
from Kaena to Station ALOHA.

March 8, 1994

Arrive at the center of Station ALOHA at 0130. Begin with shallow cast
to determine position of water transfer system (WTS). Sediment trap
deployment at 0230.  After deployment ship transit to center. Commence
with deep cast followed by 36 hour burst sampling.

March 9, 1994

CTD casts continue at 3 hour intervals throughout the day.  Go-Flo cast
conducted and primary production array successfully deployed. CTD casts
continued at 3 hour intervals. PNF cast and zooplankton tow also
conducted. Primary production array successfully recovered in the
evening.

March 10, 1994

Burst sampling continued at 3 hour intervals. Zooplankton net tows
accomplished at different time intervals. After last CTD cast,
proceeding to sediment trap site. Sediment trap array recovered without
incident. Zooplankton net tow conducted after which ship proceeds to
Station 3 at 2345.

March 11, 1994

Arrive at Station 3 at 0500. CTD cast conducted successfully.
Proceeding to Kahe point station. Arrive Kahe Station at 22000 to
conduct CTD cast. Proceeded directly to Honolulu after cast and
sampling.

March 12, 1994

Continue steaming to Honolulu. Arrive Snug Harbor at 0630.  Commence
unloading.


ANCILLARY INVESTIGATIONS AND SPECIAL PROJECTS

1. Trace metal sampling and analysis - C. Measures, R. Reitmeyer 
2. Pigment experiments - M. Latasa 
3. DIC sampling - D. Sadler 
4. Zooplankton net tows - K. Selph


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. Iodine samples for G. Luther