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HOT-201 Chief Scientist's Cruise Report
R/V Kilo Moana
May 26 - 30, 2008
Cruise ID: KM0806
Departed: May 26, 2008 at 0900 (HST)
Returned: May 30, 2008 at 0800
Vessel: R/V Kilo Moana
Operator: University of Hawaii
Master of the Vessel: Captain Richard L Meyer
Chief Scientist: Fernando Santiago-Mandujano
OTG Electronics/Deck Operations Technicians: Elly Speicher, Tobin Chen
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 the first cruise day 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 May 27 to 29.
3) Station 52, is the site of the WHOTS Mooring, located at 22 40.208'N,
157 57.001'W was to be occupied on the 4th day of the cruise for about
1 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 the 4th day of the cruise 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. After these operations, the ship was to transit to
Station ALOHA.
Upon arrival at Station ALOHA, the free-drifting sediment trap array
was to be deployed. The sediment trap array was to stay in the water
for about 52 hours. This was followed by one 350 m CTD cast
to collect water for incubation experiments, and one 1000-m CTD cast to
collect water for the primary production array. This was to be followed by the
deployment of the array with incubation experiments (primary production array)
that was to be in the water for 12 hours. A full-depth CTD cast was to be
conducted afterwards, followed by 1000-m CTD casts at strict 3 hour intervals
for at least 36 hours for continuous and discrete data collection, ending with
another full-depth CTD cast.
Another free-drifting array (gas array) was to be deployed for 24 hours for
incubation experiments on May 28.
A plankton net was to be towed near noon and midnight for 30-min intervals
on May 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 and the gas array.
After recovering the arrays, the ship was to transit to
Station 52 to conduct a one-hour 200-m CTD yo-yo cast
After station 52 was occupied, the ship was to transit to Sta. ALOHA to conduct
a PRR cast, and two consecutive AC9/FRRf casts.
After the light casts, the water pump/winch system was to be tested at station
ALOHA, after which the ship was to transit to station Kaena.
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 May 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 May 28 and 29, and
in the early morning on May 29.
The following instruments were to collect data throughout the cruise:
shipboard ADCP, thermosalinograph, pCO2 system, and two anemometers.
2. SCIENCE PERSONNEL
Cruise Participant Title Affiliation
Karin Björkman Research Specialist UH/BEACH
Tara Clemente Research Associate UH/BEACH
Susan Curless Research Associate UH/BEACH
Solange Duhamel Postdoc UH/BEACH
Lance Fujieki Computer Specialist UH/BEACH
Adriana Harlan Research Associate UH/BEACH
Dan Sadler Research Associate UH/BEACH
Brett Updyke Technician UH/BEACH
Sam Wilson Scientist UH/CMORE
Jesse Yonover Undergrad Student U Colorado
Paul Lethaby Research Associate UH/PO
Christin Shacat Research Associate UH/PO
Fernando Santiago-Mandujano Chief Scientist â Res. Assoc. UH/PO
Jefrey Snyder Marine Technician UH/PO
Sarah Yasui Undergrad Student UH/PO
Darin Hayakawa Technician UH/Rappe
Rick Dubieilh Technician Nav Sea
Tobin Chen Marine Technician OTG
Elly Speicher Marine Technician OTG
3. GENERAL SUMMARY
Operations during the cruise were conducted as planned.
One 1000-m CTD cast was conducted at Kahe station. Fourteen 1000-m CTD
casts, one 350-m, and two deep casts were conducted at Station ALOHA. One
200-m CTD yo-yo cast was conducted near the WHOTS mooring (station 52).
The array of floating sediment traps, the primary productivity
and gas incubation arrays were deployed and recovered without problems. All
arrays drifted NW.
Three net tows were conducted at night and three during the day.
The AC9/FRRf was deployed near noon two times, and one time at night.
The PRR was deployed three times near noon time.
A trace metal sample was taken (ATE).
The ADCP ran without interruption throughout the cruise, as well as the
thermosalinograph and pCO2 system. One of the ship's anemometers had
problems during the cruise and it was giving erratic wind direction
measurements.
Winds were from ESE between 12 and 18 kt during most of the cruise, decaying
to 10 kt on the last day. A westward current prevailed during the cruise with
maximum speeds of up to 30 cm/s at 100 m.
We arrived back at Snug Harbor on May 30 at 0800.
4. R/V KILO MOANA, OFFICERS AND CREW, TECHNICAL SUPPORT
The R/V Kilo Moana 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. OTG 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 25, 2008; Loading Day
The equipment was loaded during this day. The CTD wire was reterminated.
May 26, 2008
The ship departed from Snug harbor at 0910. Safety briefing conducted
at 0940, followed by a science meeting in which cruise activities were
briefly reviewed, and safety issues were addressed. Fire and abandon
ship drills were conducted at 1030 for all personnel.
Arrived at Kahe Station at 1200. CTD wire weight cast (1,300 lb) to 500 m,
during which J. Snyder inspected the CTD wire.
The Profiling Reflectance Radiometer (PRR) was deployed at 1250
A 1000-m CTD cast was conducted at 1315. After the cast ended, the ship
headed to station ALOHA.
The ship arrived to Station ALOHA at 2250. Deployed sediment traps array.
May 27, 2008
Conducted one 350-m CTD cast at 0000 (s2c1).
Conducted one 1000-m CTD cast at 0130 (s2c2).
The primary production array was deployed at 0400.
One deep CTD cast was conducted at 0454 (s2c3).
Bucket sample for microbial cultivation experiment by D. Hayakawa taken
at 0900.
Net tow conducted at 1000
1000-m CTD cast at 1058 (s2c4).
Net tow conducted at 1340
1000-m CTD cast at 1420 (s2c5)
1000-m CTD cast at 1700 (s2c6).
Primary production array recovered at 1920. The array drifted 5 nm west
1000-m CTD cast at 2000 (s2c7).
Net tow conducted at 2215
1000-m CTD cast at 2250 (s2c8).
Winds were from ESE at 12-16 kt, with smooth seas. A westward current in the
upper 200 m was present, with maximum values of up to 25 cm/s at about 100 m.
May 28, 2008
Net tow at 0100.
1000-m CTD cast at 0200 (s2c9)
Deployment of gas array at 0430
1000-m CTD cast at 0520 (s2c10).
1000-m CTD cast at 0800 (s2c11).
Trace metal sample (ATE) at 0930.
Net tow at 1000.
1000-m CTD cast at 1056 (s2c12).
PRR cast at 1213
AC9/FRRf cast at 1245
1000-m CTD cast at 1356 (s2c13)
1000-m CTD cast at 1700 (s2c14)
1000-m CTD cast at 2004 (s2c15)
Net tow at 2219
Near-bottom CTD cast at 2306 (s2c16).
Winds from ESE at 12-16 kt, with smooth seas. A westward current in the upper
200 m was present, with values of up to 25 cm/s at about 100 m.
May 29, 2008
AC9/FRRf cast at 0300
The sediment traps array was recovered at 0520 at 22 52.4'N, 158 11.16'W.
The array drifted about 13 nm NW from ALOHA Station.
The gas array was recovered at 0700 at 22 45.8'N 158 5.6'W. The array
drifted about 5.6 nm NW from ALOHA.
200-m CTD yo-yo cast near the WHOTS buoy (located inside the ALOHA circle)
(s52c1).
AC9/FRRf cast conducted at 1022.
AC9/FRRf cast conducted at 1120.
PRR cast conducted at 1240.
The water pump/winch system was successfully tested at 1300
Near-bottom CTD cast at station Kaena at 1920 (s6c1).
Easterlies at about 10 kt with smooth seas. A westward current has
been present with maximum speeds of up to 30 cm/s at 100 m.
May 30, 2008
Arrived at Snug Harbor at 0800. Full off-load.
HOT program sub-components:
Investigator: Project/Institution:
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Dave Karl Core Biogeochemistry/UH
Roger Lukas Hydrography/UH
Bob Bidigare HPLC pigments/UH
Mike Landry Zooplankton dynamics/UH
Mark Abbott/Ricardo Letelier Optical measurements/OSU
Ancillary programs:
Investigator: Project/Institution:
----------------- --------------------
Charles Keeling CO2 dynamics and intercalibration/SIO
Paul Quay DI13C and O isotopes/UW
Penny Chisholm Prochlorococcus population dynamics/MIT
Zehr/Church/Montoya/Carter Diversity and activities of nitrogen-fixing
microorganisms/UH
Various CMORE PI's CMORE RNA/DNA sampling/UH
Mark Brzeznski Silica production and dissolution rate
measurments/UCSB
Additional programs
Investigator: Project/Institution:
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Mike Rappe Marine bacterioplankton community
structure/UH
Sam Wilson Reduced gases in the upper ocean: The cycling
of methane, sulfide and nitrous oxide/CMORE/UH
Rachel Foster/Zehr Diversity and activities of nitrogen-fixing
microorganisms/UCSC
Solange Duhamel Determination of alkaline phosphatase activity
at bulk and single cell levels
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