HOT-147: Chief Scientist Report

Chief Scientist: D. SADLER

Cruise ID:  KOK0307
Departed:  April  22, 2003; 0900(HST)
Returned:  April  26, 2003; 0800(HST)
Vessel:  R/V Ka'imikai-o-Kanaloa
Operator:  University of Hawaii
Master of the Vessel: Captain Ross Barnes
Chief Scientist: Dan Sadler
STAG Electronics Technician: Steven Tottori
STAG Deck Operations: Dave Gravatt


1.  SCIENTIFIC OBJECTIVES

The objective of this cruise was to continue building a collection of
hydrographic and biogeochemical data at the Hawaii Ocean
Time-series(HOT) stations.  Three stations were to be occupied during
the cruise, in the following order:

1) Station 1, referred to as Station Kahe, is located at 21° 20.6' N,
158° 16.4' W and was to be occupied on April 22 for about 3 hours.

2) Station 2: ALOHA (A Long Term Oligotrophic Habitat Assessment) is
defined as a circle with a 6 nautical mile radius centered at 22° 45'N,
158° W.  This is the main HOT station and was to be occupied for 3 days
from April 23 though April 26.

3) Station 6: Located off Kahe Point at 21° 50.8' N, 158° 21.8' W.
Station 6 was planned to be occupied on April 26 for about 3 hours.

A single CTD cast was to be conducted at Station 1 to collect
continuous profiles of various physical and chemical parameters.  Water
samples were to be collected at discrete depths for biogeochemical
measurements.

Upon arrival at Station ALOHA, a floating sediment trap array was to be
deployed.  A full-depth CTD cast was to be conducted followed by CTD
casts at 3-hour intervals for 36 hours of continuous and discrete data
collection.  Plankton net tows were to be conducted near noon and
midnight on April 23 and 24.  A floating primary production experiment
was to be deployed and recovered on April 24. Following recovery of the
sediment traps on April 25, the ship was scheduled to return to Station
ALOHA for optical casts.  Once work was completed at Station ALOHA, the
ship was to transit to Station 6 for a single 2500 m cast. The ship was
scheduled to return to SNUG Harbor at 0800 on April 26 and unload.  The
following instruments were to collect data throughout the cruise: a
shipboard ADCP, a thermosalinograph, a fluorometer and an anemometer.




2.  	SCIENCE PERSONNEL

PO Group:
 Yves Veillerobe			Undergraduate Student	UH
 Fernando Santiago-Mandujano 		Research Associate	UH
	(Watch Leader)
 Shimi Rii				Research Associate	UH
 Mark Valenciano			Electronics Technician	UH
 Hillary Ellis				Undergraduate Student	UH
 
JGOFS Group:
 Thomas Gregory				Research Associate	UH
 Anne Gasc				Research Associate	UH 
 Lance Fujieki				Computer Specialist	UH
 Tara Clemente	(Watch Leader)		Research Associate	UH
 Daniel Sadler (Chief Scientist)	Research Associate	UH
 Evgeny Dafner				Research Specialist	UH
 Cecelia Sheridan			Graduate Student	UH
 Eric Grabowski				Research Associate	UH
 Cory Lar Rieu				Volunteer		HI

STAG Group:
 Dave Gravatt				
 Steve Tottori


3.  GENERAL SUMMARY

All operations at all stations were conducted as planned. Thirteen 1000
m and two 4800 m CTD casts were obtained at Station ALOHA. A 1000 m
cast was obtained at Station Kahe.  A 2500 m CTD cast was completed at
Kaena Point.  Also, three PRR/TSRB cast were performed at Station
ALOHA.

C. Sheridan successfully completed six plankton net tows.

The PRR, TSRB and AC9/FRRf were deployed as planned.

The ADCP ran without interruption throughout the cruise, as well as the
fluorometer, thermosalinograph and the ship's anemometer.

All ancillary work was completed.

We arrived back at Snug Harbor on April 26 at 0730.  A complete
off-load took place immediately.



4.  R/V KA'IMIKAI-O-KANALOA, OFFICERS AND CREW, TECHNICAL SUPPORT

The R/V Ka'imikai-o-Kanaloa and her crew delivered excellent ship
support for our work. The officers and crew were most helpful and
accommodating and are to be commended for maintaining high standards.

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 (HST)

April 21, 2003; Loading Day

Equipment loaded on this day.  The CTD cable was re-terminated,
followed by a test of the CTD system.


April 22, 2003

The ship departed from Snug harbor at 0920.  Fire and abandon ship
drills were conducted followed by a science meeting to review the
objectives and schedule for the cruise. We arrived at Station Kahe at
1206 and conducted a weight cast (400 lb) to 1000 m. The PRR and TSRB
were deployed at 1306 followed by a 1000 m CTD cast. The ship departed
Station Kahe at 1522 and proceeded to Station ALOHA.


April 23, 2003

We arrived at Station ALOHA at 0056.  A net tow was conducted at 0122.
The sediment trap array was deployed at 0238 followed by a 4500 m CTD
cast at 0345.  The 36 hour burst CTD sampling began at 0838 and
continued throughout the day. Six 1000 m casts were completed.
Additional net tows were completed at 1027, 1300, 1340 and 2229.

April 24, 2003

Seven 1000 m CTD casts were completed.  The primary production array
was deployed at 0615 and recovered at 1905.  A net tows was completed
at 0126.  The PRR/TSRB optical packages were deployed at noon.  An
AC-9/FRRf casts was conducted at 1402.

April 25, 2003

A 4500 m deep CTD cast was completed at 0219.  The AC9/FRRf was
deployed at 0301. The sediment trap array was successfully recovered at
0711.  The PRR/TSRB optical packages were deployed at 1101 followed by
AC-9/FRRf casts at 1200 and 1306.  The ship departed Station ALOHA at
1411 and transited to Station 6.  We arrived at Station 6 at 2030 and
conducted a 2500 m CTD cast at 2036.  We departed Station 6 at 2136
proceeded to Honolulu Harbor.


April 26, 2003

We arrived at Snug Harbor at 0730.  A full offload took place upon
arrival.



WEATHER:

Below is the cruise bridge log description for HOT 147.  Wind and sea
directions are in degrees, wind speed in knots, seas in Beaufort scale,
swells in feet, barometer in inches Hg, temp in F (dry bulb), clouds in
tenths.

Date	       Wind	   Sea	     Swell	Barometer    Temp   Clouds

Tue. 22 April  090, 13-25  090, 3-5  090, 8-10  30.05-30.12  68-72  2-3
Wed. 23 April  080, 18-25  080, 4-5  080, 8     30.06-30.12  68-71  2-10
Thu. 24 April  080, 18-30  080, 5-6  090, 8-10	30.02-30.08  69-72  4-9
Fri. 25 April  080, 18-20  080, 4-5  090, 7-8	30.02-30.09  73-78  4-8
Sat. 26 April  090, 3-10   090, 2    130, 3	30.01	     73	    1-3



Sub component programs:

Investigator:                   Project:
-----------------               ----------
Bob Bidigare			HPLC pigments/UH
Mike Landry			zooplankton dynamics/UH
John Dore			CO2 dynamics/UH


Ancillary programs:

Investigator:                   Project:
-----------------               ----------
Charles Keeling			CO2 dynamics and intercalibration/SIO
Paul Quay			DI13C and O isotopes/UW
Mark Abbott/Ricardo Letelier	Optical measurements/OSU
Sally Chisholm			Prochlorococcus population dynamics/MIT