HOT-150: Chief Scientist Report

Chief Scientist: D. SADLER

Cruise ID:  KOK0310
Departed:  July 18, 2003; 0900(HST)
Returned:  July 22, 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: Tim McGovern
STAG Deck Operations: Kuhio Vellalos


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 July 18 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 July 19 though July 21.

3) Station 6: Located off Kahe Point at 21° 50.8' N, 158° 21.8' W.
Station 6 was planned to be occupied on July 21 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 July 19 and 20.  A floating primary production experiment
was to be deployed and recovered on July 20. Following recovery of the
sediment traps on July 21, 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 July 22 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:
 Jediah Bishop				Undergraduate Student	HPU
 Justin Dilg				Undergraduate Student	UH
 Fernando Santiago-Mandujano 		Research Associate	UH
	(Watch Leader)	
 Maya Iriondo				Graduate Student	UH
 Mark Valenciano			Electronics Technician	UH
 Daniel Fitzgerald			Research Associate	UH
 
JGOFS Group:
 Karin Björkman				Research Associate	UH
 Nicholas Jachowski			High School Student	HI 
 Lance Fujieki				Computer Specialist	UH
 Tara Clemente	(Watch Leader)		Research Associate	UH
 Daniel Sadler (Chief Scientist)	Research Associate	UH
 Evgeny Dafner				Research Specialist	UH
 Melinda Simmons			Graduate Student	SIO
 Eric Grabowski				Research Associate	UH

Ancillary Investigators:
 Allan Devol				Professor		UW
 Benjamin Van Mooy			Graduate Student	UW
 Guido Corno				Graduate Student	OSU
 
STAG Group:
 Tim McGovern
 Kuhio Vellalos



3.  GENERAL SUMMARY

All operations at all stations were conducted as planned. Thirteen 1000
m, one 100 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:
one at Station Kahe and two at Station ALOHA.

M. Simmons 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 July 22 at 0728.  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)

July 17, 2003; Loading Day

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


July 18, 2003

The ship departed from Snug harbor at 0922.  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
1207 and conducted a weight cast (400 lb) to 1000 m. The PRR and TSRB
were deployed at 1312 followed by a 1000 m CTD cast. The ship departed
Station Kahe at 1507 and proceeded to Station ALOHA.


July 19, 2003

We arrived at Station ALOHA at 0039.  A net tow was conducted at 0100.
The sediment trap array was deployed at 0236 followed by a 4500 m CTD
cast at 0251.  The 36 hour burst CTD sampling began at 0833 and
continued throughout the day. Six 1000 m casts were completed.
Additional net tows were completed at 1000, 1302, 1545 and 2227.

July 20, 2003

Seven 1000 m CTD casts were completed.  The primary production array
was deployed at 0445 and recovered at 1915.  Net tows were completed at
0124, 1001 and 1028.  The PRR/TSRB optical packages were deployed at
noon.  An AC-9/FRRf casts was conducted at 1351.

July 21, 2003

A 4500 m deep CTD cast was completed at 0205.  The AC9/FRRf was
deployed at 0303. A 100 m CTD was conducted at 0532 to collect water
for Van Mooy and Devol. The sediment trap array was successfully
recovered at 0705.  The PRR/TSRB optical packages were deployed at 1155
followed by AC-9/FRRf casts at 1343 and 1353.  The ship departed
Station ALOHA at 1453 and transited to Station 6.  We arrived at
Station 6 at 2106 and conducted a 2500 m CTD cast at 2112.  We departed
Station 6 at 2300 and proceeded to Honolulu Harbor.


July 22, 2003

We arrived at Snug Harbor at 0728.  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

Fri. 18 April  090, 12-22  090, 2-4  090, 3-6  30.00-30.08  77-86  2-6 
Sat. 19 April  080, 15-18  090, 3-4  080, 5-6  30.05-30.10  75-81  2-10
Sun. 20 April  090, 18-28  090, 4-5  090, 5-6  30.03-30.09  76-84  4-10
Mon. 21 April  090, 20-25  090, 4-5  090, 5-6  29.97-30.06  77-83  4-10
Tue. 22 April  080, 10-15  080, 2    120, 2-3  29.94	    77	   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

Others:

Investigator:                   Project:
-----------------               ----------
Benjamin Van Mooy		Phosphate uptake by marine microorganisms/UW