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


HOT-148: Chief Scientist Report


Chief Scientist: F. SANTIAGO-MANDUJANO


           HOT-148 Chief Scientist's Cruise Report
                  R/V Ka'Imikai-O-Kanaloa
                      May 19-23, 2003

Cruise ID: KOK0308
Departed:  May 19, 2003 at 0900 (HST)
Returned:  May 23, 2003 at 0730
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: Steve Tottori

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 May 19 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 May 20 to May 22.

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 May 22 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 net tow was to be conducted, followed
by the 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 May 21. 

 A plankton net was to be deployed near noon and midnight on May 20
and 21 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) and a Tethered Spectral 
Radiometer Buoy (TSRB) were to be deployed for half-hour periods
near noon time on each day.

 A package including a Wet Labs AC9, a Fast Repetition Rate Fluorometer 
(FRRf), and a SeaBird Seacat was to be used to profile the upper 200 m
at Sta. ALOHA for one-hour periods on May 21 and 22.

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


2.  	SCIENCE PERSONNEL

JGOFS group:
 Karin Björkman                  Research Specialist            UH
 Tara Clemente			 Research Associate	        UH
 Anne Gasc   	 		 Research Associate		UH 
 Eric Grabowski (Watch Leader)	 Research Associate	        UH
 Lance Fujieki			 Computer Specialist          	UH
 Tom Gregory			 Research Associate		UH
 Dan Sadler			 Research Associate		UH
 Valerie Franck			 Scientist			UH
 Colleen Allen		         Technician	    		UH 

PO group:
 Marion Bandet			 Graduate Student       	UH
 Yoshimi Rii			 Research Associate       	UH
 Daniel Fitzgerald (Watch Leader) Research Associate       	UH
 Mark Valenciano                 Electronics Technician     	UH
 Jediah Bishop	                 Undergraduate Student 		HPU
 Fernando Santiago-Mandujano	 Chief Scientist (Res. Assoc.)	UH


3.  GENERAL SUMMARY

 
 Operations were conducted as planned, with an interruption during
the CTD cast at Kahe Station due to communication problems between the
CTD and the bottle sampler, apparently caused by a faulty cable.

 Fourteen 1000-m CTD casts and two deep casts (~4740 m) were conducted 
at Station ALOHA.  Two 1000-m CTD casts were conducted at station
Kahe. One near-bottom cast (~2500 m) was conducted at Station 6. 

 The array of floating sediment traps and the incubation array were
deployed and recovered without incidents. The sediment traps array
drifted northwestward, and the incubation array drifted westward.

 C. Allen completed successfully 6 plankton net tows. 

 The PRR, TSRB and AC9/FRRf were deployed as planned, but the AC9 did not
work due to problems with its battery pack.

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

 Winds were easterlies at 10-12 kt, and sea state 2-3.

 We arrived back at Snug Harbor on May 23 at 0730. 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)

May 16, 2003; Loading Day

 Minor equipment loaded on this day. Major equipment was already on board, 
since it was not unloaded from the previous HOT cruise. Terminated CTD wire 
and tested CTD system.

May 19, 2003

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

 Arrived to Kahe Station at 1200 and a weight cast (400 lb) to 1000 m
was conducted during which M. Valenciano inspected the CTD wire. At
1300 the Profiling Reflectance Radiometer (PRR) and Tethered Spectral
Radiometer Buoy (TSRB) were deployed. 

 A 1000-m CTD cast was started at 1400, but failed to fire bottles due
to problems communicating with the water sampler. Aborted cast at
1000-m, brought package on board and troubleshooted. The problem was solved
after replacing the cable between the carousel and CTD.  Conducted a second
1000-m cast without problems, after which the ship headed towards
Station ALOHA.

 Winds were easterlies at 12 kt. Sea state 3.

May 20, 2003

 Arrived at Station ALOHA at 0200, and proceeded to deploy the sediment
traps, inmediately followed by the deep PO cast, which ended at 0700
without any problems. This cast was followed by the shallow PO cast at
0900, which started the 36-hr CTD cast period.  A total of six 1000-m
CTD casts were conducted this day.

 Two net tows were conducted between 1000 and 1400 on May 20. Three net
tows were conducted between 2200, May 20 and 0200, May 21.

 Winds were 10 kt easterlies, and 2 sea state.
 
May 21, 2003

 Seven 1000-m CTD casts were conducted during this day, ending the 36-hr
CTD cast burst period at 2100. A second deep cast was started at 2300. 

 The primary productivity array was deployed at 0600, and was retrieved
at 1900. The array drifted 6 nm west of the center of ALOHA Sta.

 One net tow was conducted at 1000.

 PRR and TSRB were deployed at 1200, followed by a AC9/FRRf cast. Only
the FRRf functioned correctly, as the AC9-fluorometer-Seacat package
did not function due to problems charging its battery pack.

 Winds were easterlies at 12 kt, and 2 sea state.

May 22, 2003

 The second deep CTD cast that started at 2300 on May 21 was completed
by 0215.

 The floating sediment trap array was recovered at 0600.  The array
drifted 11.5 nm northwest from the center of Station ALOHA. 

 One AC9/FRRf cast was conducted at 0300 at ALOHA Sta. Only the FRRf
functioned properly. PRR/TSRB and FRRf measurements were conducted
between 1100 and 1300 at ALOHA.

 A near-bottom cast (~2500 m) was conducted at 1900 at Station Kaena 
(Stn. 6), after which the ship headed back to Snug harbor.

 Winds were easterlies at 12 kt and sea state 2.

May 23, 2003

 Arrived at Snug Harbor at 0730. 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

Ancillary programs:

Investigator:                   Project/Institution:
-----------------               --------------------
Charles Keeling                 CO2 dynamics and intercalibration/SIO
Mark Abbott/Ricardo Letelier    optical measurements/OSU
Penny Chisholm/Erik Zinser	Prochlorococcus ecotype dynamics/MIT

Others:
Karin Björkman                  phosphorus cycling/UH
Valerie Franck			silicon cycling and diatom productivity/UH