Hawaii Ocean Time-series (HOT)
in the School of Ocean and Earth Science and Technology at the University of Hawai'i at Manoa


HOT-161: Chief Scientist Report


Chief Scientist: F. SANTIAGO-MANDUJANO


           HOT-161 Chief Scientist's Cruise Report
                  R/V Ka'Imikai-O-Kanaloa
                      July 12-14, 2004

Cruise ID: KOK0411
Departed:  July 12, 2004 at 0930 (HST)
Returned:  July 14, 2004 at 1400
Vessel:  R/V Ka'Imikai-O-Kanaloa
Operator:  University of Hawaii
Master of the Vessel: Captain Ross Barnes
Chief Scientist: Fernando Santiago-Mandujano
STAG Electronics Technician: Steve Poulos
STAG Deck Operations: Dave Gravatt

1.  SCIENTIFIC OBJECTIVES

 The objective of this cruise was to maintain 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 12 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, 
158W. This is the main HOT Station and was to be occupied for 3 days 
from July 13 to July 15.

3) Station 6, referred to as Station Kaena, is located off Kaena Point
at 21 50.8'N, 158 21.8'W was to be occupied on July 15 for about
2 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 1000 m CTD cast was to be conducted
to collect water for K. Bjorkman's experiment, followed by a net tow, 
and by the subsequent deployment of a free-drifting sediment trap array. 
After deployment, a full-depth CTD cast was to be conducted, followed by 
CTD casts at strict 3 hour intervals for at least 36 hours for continuous 
and discrete data collection, followed by another full-depth CTD cast.

 One free-drifting array was to be deployed for 12 hours for 
incubation experiments on July 14. 

 A plankton net was to be deployed near noon and midnight on July 13
and 14 at Station ALOHA.

 After CTD work at Station ALOHA was accomplished, the ship was to transit
to recover the floating sediment trap array. After recovering the
sediment traps, the ship was to return to Sta. ALOHA to continue light
cast operations, after which the ship was to transit to Station 6.

 A near-bottom CTD cast (~2500 m) was to be conducted at Station 6
including salinity samples for calibration, after which the ship was 
to transit back to Snug Harbor.

 A Profiling Reflectance Radiometer (PRR) was to be deployed for half-hour
periods near noon time on July 12, 14 and 15.

 A package including a Wet Labs AC9, a Chelsea Fast Repetition Rate 
Fluorometer (FRRf), and a SeaBird Seacat was to be used to profile 
the upper 200 m at Sta. ALOHA at noon time on July 14 and 15.

 The following instruments were to collect data throughout the cruise: 
shipboard ADCP, thermosalinograph, fluorometer, and two anemometers.


2.  	SCIENCE PERSONNEL

BEACH group:
 Karin Björkman			 Research Specialist		UH
 Jennifer Brum			 Graduate Student 		UH
 Tara Clemente	 		 Research Associate	        UH
 Lance Fujieki			 Computer Specialist          	UH
 Marcie Grabowski 		 Graduate Student	        UH
 Tom Gregory			 Research Associate		UH
 Nick Jachowski			 Volunteer			UH
 Patricia McAndrew		 Graduate Student		UH
 Yoshimi Rii			 Graduate Student		UH
 Dan Sadler (Watch Leader)	 Research Associate		UH
 Melinda Simmons		 Graduate Student	    	UH 

PO group:
 Bryan Deschenes		 Graduate Student		UH
 Maya Iriondo			 Research Assistant	    	UH 
 Xavier Murard		         Research Associate 		UH
 Fernando Santiago-Mandujano	 Chief Scientist (Res. Assoc.)	UH
 Jefrey Snyder (Watch Leader)    Electronics Technician     	UH

Others:
 Benjamin Van Mooy		Post-Doc			WHOI

3.  GENERAL SUMMARY

 
 The cruise was cut short to less than 2.5 days because one of the ship's 
generators failed during transit to ALOHA station. The ship returned to
Honolulu after conducting operations at ALOHA for 10 hours.

 Operations at Kahe station were conducted as planned. One 1000-m CTD cast 
was conducted at this station.

 Due to the ship's generator problem, operations at ALOHA were reduced to a
minimum. One deep cast (~4740 m), and four shallow casts between 175 and 
700-m were conducted at Station ALOHA.   

 Neither the sediment traps nor the primary productivity array were
deployed. The plankton net tows were not deployed either.

 The PRR was deployed at Kahe Station on July 12, and at ALOHA station
on July 13. 

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

 Winds were easterlies at 20 kt, and sea state 4.

 We arrived back at Snug Harbor on July 14 at 1400. Full off-load 
took place on July 15.


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

 The R/V Ka'Imikai O Kanaloa continues to maintain the excellent ship
support for our work. The officers and crew were most helpful and
accommodating.  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.

5.  DAILY REPORT OF ACTIVITIES (HST)

July 10, 2004; Loading Day

 Equipment loaded on this day. CTD wire was re-terminated and CTD system
tested.

July 12, 2004

 The ship departed from Snug harbor at 0930. Delayed 30 min due to 
harbor traffic. Fire and abandon ship drills conducted at 1030, followed 
by a short science meeting during which cruise activities were briefly 
reviewed, and safety issues were addressed.

 Arrived to Kahe Station at 1250. Late arrival due to problems with the 
ship's anchor. A weight cast (400 lb) to 1000 m was conducted at 1300, 
during which J. Snyder inspected the CTD wire. 

At 1345 the Profiling Reflectance Radiometer (PRR) was deployed. 

 A 1000-m CTD cast was started at 1437 and ended at 1544, after which the
ship headed towards Station ALOHA. 

 The ship's port generator failed during transit to ALOHA at 2100. Continued
transit to ALOHA at a speed of 4 kt.


July 13, 2004

 Arrived at Station ALOHA at 0750. After contacting the UH Marine
Center, the captain informed us that we had to head back to Honolulu
at 1800 for safety reasons. In the mean time we were able to conduct CTD 
casts. The cast schedule was modified to optimize the CTD and bottle 
sampling in the time allotted.

 One 700 dbar CTD cast was conducted at 0750, followed by one near-bottom 
cast (4740 m) at 0914, one 200 m cast at 1400, one 175 m cast at 1530, and 
one 200 m cast at 1700. 

 One PRR cast was conducted at 1315.

 Departed to Snug harbor at 1730. Ship's speed about 4-5 kt.

 Winds were easterlies at 20 kt and sea state 4.

July 14, 2004

 Deployed the CTD at 0500 to collect near surface water for Ben Van Mooy's
experiments.

 Arrived at Snug harbor at 1400. Partial off-load of samples by the
BEACH group took place.


July 15, 2004

 Full off-load of the rest of the equipment.


Sub component programs:

Investigator:                   Project/Institution:
-----------------               --------------------
Bob Bidigare                    HPLC pigments/UH
Mike Landry			Zooplankton dynamics/UH
John Dore			CO2 dynamics/UH
Marcie Grabowski		Controls on nitrogen fixation/UH
Karin Bjorkman/Nick Jachowski	Nutrient Enrichment/UH
Jennifer Brum			Virus concentrate/UH

Ancillary programs:

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

Ancillary research during this cruise:

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