Departed: May 17, 2004 at 0900 (HST)
Returned: May 21, 2004 at 0730 (HST)
Vessel: R/V Ka‘imikai-o-Kanaloa Cruise ID: KOK0407
Operator: University
of Hawaii Master of the Vessel: Captain Ross Barnes
STAG Electronics Technician:
Tim McGovern 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 May 17 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 May 18 –
May 20.
3) Station 6, referred to as Station Kaena, is located off Kaena Point at 21°
50.8'N, 158° 21.8'W and was to be occupied on May 20 for about 4 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. PRR measurements were also
to be made.
Upon arrival at Station ALOHA, a net tow followed by the deployment of a free-drifting
sediment trap array was to be conducted. 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. The primary production array was to be deployed on May
19 for 12 hours. PRR and AC-9 operations were to be done around noon May 19
and 20. The drifting sediment trap array was to be recovered near dawn on May
20.
Plankton net tows were to be conducted near noon and midnight on May 18 and
19.
Following Station ALOHA operations, the ship was to transit to Station 6 to
conduct one 2500 m CTD cast including salinity samples for calibration, after
which the ship was to transit back to Snug Harbor.
The following instruments were to collect data throughout the cruise: a shipboard
ADCP, a thermosalinograph and fluorometer, and an anemometer.
2.
SCIENCE PERSONNEL
Fernando Santiago-Mandujano (Watch Leader) Research Associate UH
Santiago Andrioni Undergraduate Student HPU
Kelly LaRue Undergraduate Student HPU
Maya Iriondo Research Associate UH
Xavier Murard Research Associate UH
Bryan Deschenes Graduate Student UH
Thomas Gregory (Chief Scientist) Research Associate UH
Blake Watkins Marine Engineer UH
Tara Clemente Research Associate UH
Katie Giles Undergraduate Student UH
Lance Fujieki Computer Specialist UH
Eric Grabowski (Watch Leader) Research Associate UH
Dan Sadler Research Associate UH
Cecelia Sheridan Graduate Student UH
Marcie Grabowski Graduate Student UH
Blade Shepherd-Jones Undergraduate Student UH
3.
GENERAL SUMMARY
All operations at Stations ALOHA, Kahe and Kaena were conducted as planned.
One 1000 m cast was performed at Station Kahe. Thirteen 1000 m and two 4740
m CTD casts were obtained at Station ALOHA. One 2500 m cast was obtained at
Station Kaena. All free-floating arrays were deployed and recovered without
incident. C. Sheridan successfully completed six plankton net tows. Weather
conditions were favorable throughout the cruise.
The ADCP ran without interruption throughout the cruise, as well as the fluorometer,
thermosalinograph and the ship's anemometer.
We arrived back at Snug Harbor on May 21 at around 0730. A partial off-load
took place immediately.4. R/V KA‘IMIKAI-O-KANALOA, OFFICERS AND CREW,
TECHNICAL SUPPORTThe R/V Ka‘imikai-o-Kanaloa and her crew continue to
deliver excellent ship support for our work. The officers and crew were most
helpful and accommodating and are to be commended for maintaining high standards.
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 good. STAG personnel were available
at any time to assist in our work and were, in general, helpful.
5.
DAILY REPORT OF ACTIVITIES (HST)
May 14, 2004 Loading Day
Equipment loaded on this day. The CTD system was tested.
May 17, 2004
The ship departed from Snug harbor at 0900. Fire and abandon ship drills were
conducted at 0931, followed by a short science meeting during which the cruise
schedule was reviewed and safety issues were discussed.
We arrived at Station Kahe at 1155 and immediately conducted a weight cast (400
lb) to 1000 m. Next we deployed and recovered the PRR. A 1000 m CTD cast was
begun at 1402 and was back on deck at 1512 at which time we began transit to
Station ALOHA.
May 18, 2004
We arrived at Station ALOHA at 0001and immediately performed a net tow followed
by deployment of the sediment trap array. The deep PO cast started at 0200 followed
by the shallow WOCE cast, which initiated the 36hr CTD cast period. We
conducted six 1000 m casts this day.
Net tows were conducted at 0016, 1003, 1300 and 2200.
May 19, 2004
Seven 1000 m CTD casts were conducted this day. The second deep cast was begun
at 2336.
Net tows were performed at 0100 and 1000.
The PRR was deployed at 1200. An AC-9 cast was conducted at 1230.
The primary productivity array was deployed at 0415 and recovered at 1915.
The thermosalinograph failed for one hour beginning at 0930 and was fixed by
T. McGovern. May 20, 2004
The deep cast was recovered at 0228 after which we steamed to the sediment trap
array and prepared for a recovery at dawn.
The sediment trap was recovered at 0634. After the sediment trap array had been
recovered we steamed back to Station ALOHA for optics work.
A PRR cast was performed at 1103 and AC9 casts were performed at 1132 and 1227.
After recovery of the final AC9 cast we steamed to Station Kaena.
A 2500 m CTD cast was performed at Station Kaena. This was recovered at 2045
and we began steaming back to Snug Harbor.
May 21, 2004
Arrived at Snug Harbor at 0730. A partial offload took place immediately.
Sub component programs:
Investigator: Project:
---------
Bob Bidigare HPLC pigments/UH
Mike Landry zooplankton dynamics/SIO
John Dore CO2 dynamics/UH
Ancillary programs:
Investigator: Project:
---------
Charles Keeling Paul Quay CO2 dynamics and intercalibration/SIO DI13C and O
isotopes/UW
Mark Abbott/Ricardo Letelier optical measurements/OSU
Penny Chisholm/Erik Zinser Prochlorococcus ecotype dynamics/MIT