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


HOT-165: Chief Scientist Report


Chief Scientist: F. SANTIAGO-MANDUJANO


           HOT-165 Chief Scientist's Cruise Report
                  R/V Ka'Imikai-O-Kanaloa
                   November 26 - 30, 2004

Cruise ID: KOK0428
Departed:  November 26, 2004 at 0900 (HST)
Returned:  November 30, 2004 at 0800
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: Daniel Fitzgerald
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. Four 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 November 26 for about 2 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 November 27 to 29.

3) Station 50, is the site of the Ocean Reference Station Mooring, 
located at 22 45'N, 157 54'W was to be occupied on November 29 for about
1/2 hour.

4) 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 November 29 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 November 28. 

 A plankton net was to be deployed near noon and midnight on November 27
and 28 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 transit to Sta. 50 to conduct a 200-m
CTD cast and then to return to Sta. ALOHA to continue light
cast operations. At the end of these operations, 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 November 26, 28 and 29.

 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 November 28 and 29.

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


2.  	SCIENCE PERSONNEL


 Cruise Participant		 Title				Affiliation

BEACH group:
 Karin Björkman			 Research Specialist		UH
 Matt Church			 Research Oceanographer		UH
 Tara Clemente	 		 Research Associate	        UH
 Lance Fujieki			 Computer Specialist          	UH
 Eric Grabowski 		 Research Associate	        UH
 Marcie Grabowski 		 Graduate Student	        UH
 Tom Gregory (Watch Leader)	 Research Associate		UH
 David Nichols			 Volunteer
 Melinda Simmons		 Graduate Student	    	SIO 

PO group:
 Paul Lethaby (Watch Leader)	 Research Associate		UH
 Andrea Rivera			 Undergrad. Student		UH
 Damion Rosbrugh		 Undergrad. Student		UH
 Alejandro Sanchez-Barba	 Graduate Student		UH
 Fernando Santiago-Mandujano	 Chief Scientist (Res. Assoc.)	UH
 Mark Valenciano    		 Electronics Technician     	UH
 Carolyn Wells			 Undergrad. Student		UH

Others:
 Rachel Foster			 Scientist		    	UCSC


3.  GENERAL SUMMARY

 
 Operations during the cruise were conducted as planned, with minor
delays in the schedule for the first two CTD casts at ALOHA Sta. 

 One 1000-m CTD cast was conducted at Kahe station. Thirteen 1000-m CTD 
casts and two deep casts (~4740 m) were conducted at Station ALOHA. One
200-m CTD cast was conducted near the ORS mooring (Station 50). 
One near-bottom cast (~2400 m) was conducted at station Kaena (Station 6). 

 The array of floating sediment traps and the primary productivity
incubation array were deployed and recovered without incidents. Both 
arrays drifted northeast.

 M. Simmons completed successfully 6 plankton net tows. 

 The PRR and AC9/FRRf were deployed as planned. 

 The ADCP ran without interruption throughout the cruise, as well as the
thermosalinograph, and the ship's two anemometers. No continuous
fluorometer data were collected because the sensor was being calibrated
at Turner.

 Winds were easterlies of about 10 kt early in the cruise, increasing to
25 kt by the end of the cruise. A swell from NE of up to 10 ft was also
present by the end of the cruise.

 We arrived back at Snug Harbor on November 30 at 0800. Full off-load 
took place immediately.


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)

November 24, 2004; Loading Day

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

November 26, 2004

 The ship departed from Snug harbor at 0900. Fire and abandon ship drills 
were conducted at 0930, followed by a science meeting during which cruise 
activities were briefly reviewed, and safety issues were addressed.

 Arrived to Kahe Station at 1200. A weight cast (400 lb) to 500 m was 
conducted at 1205. 

 At 1230 the Profiling Reflectance Radiometer (PRR) was deployed. 

 A 1000-m CTD cast was started at 1335 and ended at 1448. After the cast 
ended, the ship headed towards Station ALOHA.   

November 27, 2004

 Arrived at Station ALOHA at 0000 and conducted a 1000-m CTD cast starting
at 0010.

 After the 1000-m CTD cast, a net tow was conducted, followed by the
deployment of the sediment traps array. The array was deployed 3 nm north 
from the center of ALOHA, to prevent it from drifting into the ORS mooring.
Mooring's buoy coordinates showed that the buoy was leaning towards the
northeast, indicating a drift in this direction.

 The deep CTD/PO cast started at 0305 and ended at 0633. This cast was followed 
by the  shallow CTD/PO cast at 0825, which marked the beginning of the 36-hr
CTD burst period. A total of six 1000-m CTD casts were conducted this
day as part of the CTD burst period.

 Two net tows were conducted between 1000 and 1400.

 Easterly winds up to 10 kt.

November 28, 2004

 Seven 1000-m CTD casts were conducted on this day, which completed the
36-hr CTD burst period. A deep cast followed. 

 The primary productivity array was deployed at 0650, 1.7 nm north from the
center of ALOHA station, and recovered at sunset (1800).

 One PRR cast and one AC9/FRRf casts were conducted at noon time. 

 Two net tow were conducted at night and one during the day

 Easterly winds 20-25 kt.

November 29, 2004

 The sediment trap array was retrieved at 0730, 12 nm NE from
the center of station ALOHA.

 One 200-dbar CTD cast was conducted at 0926 near the ORS mooring (Sta. 50). 
One near-bottom cast was conducted at station Kaena at 2047.

 One AC9/FRRf cast was conducted at 0300, and two more at noon time.
One PRR cast was conducted at noon. 

 Easterly winds up to 25 kt, with swell from NE of up to 10 ft.

November 30, 2004

  Arrived at Snug Harbor at 0800. Full off-load took place immediately.


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 Björkman			Nutrient Enrichment/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:
-----------------               --------------------
Rachel Foster			Planktonic Symbioses: the abundance and
				diversity at Station Aloha/UCSC