Vessel: R/V Roger Revelle, Scripps Institution of Oceanography, UCSD
Master of the Vessel:
Chief Scientist: Luis Tupas
Deck Technician:
Electronics Technician:
Loading: September 20, 1997
Departure: September 21, 1997 @ 0900
Arrival: September 23, 1997 @ 0800
Unloading: Immediately upon arrival
1.0. Summary of Scientific Objectives
The objective of the cruise is to maintain collection of hydrographic and biogeochemical data at the Hawaii Ocean Time-series (HOT) stations; Station 2 (ALOHA) and Station 8 (HALE ALOHA). CTD casts at approximately 3 hour intervals will be conducted while at station to collect continuous profiles of physical and optical parameters. Water samples will be collected at discrete depths for biogeochemical measurements. The ship is requested to remain on station during this sampling period. A free-drifting array will be deployed for 12 hours on September 22 for a primary production experiment. The ship is requested to stay with the array during this period. After operations at Station ALOHA are accomplished, the ship shall proceed to a position near the HALE ALOHA mooring to conduct a CTD cast before returning to Snug Harbor. A plankton net will be deployed near noon and midnight while at Station ALOHA. A profiling reflectance radiometer (PRR) will be deployed and retrieved around noon at Station ALOHA.
2.0. SCIENCE PERSONNEL (TENTATIVE)
David Karl - UH Professor
Roger Lukas - UH Professor
Christopher Winn - UH Assistant Researcher
Luis Tupas - UH Assistant Specialist
Dale Hebel - UH Assistant Specialist
Daniel Sadler - UH Research Associate
Lance Fujieki - UH Research Associate
Karin Bjorkman - UH Research Associate
Ursula Magaard - UH Research Associate
Terrence Houlihan - UH Research Associate
Patrick Driscoll - UH Research Associate
Fernando Santiago-Mandujano - UH Research Associate
Craig Nosse - UH Research Associate
Stephanie Christensen - UH Research Associate
Stuart Donachie - UH Post-doctoral Researcher
Albert Calbet - UH Post-doctoral Researcher
Angie Thomson-Bulldis - UH Graduate Student
Christopher Carrillo - UH Graduate Student
3.0. GENERAL SHIP SCHEDULE
Loading of equipment shall take place on Saturday, September 20, 1997. All science personnel shall be on hand to load the ship. Ship will depart Snug Harbor on Sunday, September 21, 1997 at 0900. All science personnel should be on-board by 0830. The ship is expected to return to Snug Harbor on Tuesday, September 23, 1997 at 0800. Off-loading shall proceed immediately. We expect to complete off-loading by 1200.
4.0. DETAILED OPERATIONAL PLANS
4.1. Station ALOHA (22o45'N, 158oW with 6 nautical mile radius).
4.1.1. Water column measurements
Vertical profiles of temperature, conductivity, dissolved oxygen, flash fluorescence and beam transmission will be made with an instrument package consisting of a Seabird CTD and flash fluorometer attached to a 24 place rosette with 12 liter sampling bottles. We need the ships CTD winch for this operation. Water samples for biogeochemical measurements will also be collected on each cast. The series of casts shall be made approximately every 2.5-3 hours (see schedule). The last cast shall be made to the near bottom (approximately 4800 m) We request the ship to maintain position within the study area for that period of time.
4.1.2. Plankton net tows
A plankton net will be deployed from the stern and shall be towed for half-hour periods. Half-hour periods are scheduled at around noon and midnight while at station. Use of a capstan to deploy the towing rope and a crane or A-frame to hold the block will be needed.
4.1.3. Primary production experiment
A water cast using 8 Go-Flo bottles on a kevlar line will be made at 0100 on September 22 from the starboard side. Water from this cast will be used for a primary production experiment. Before sunrise the free drifting array for incubating the experiment will be deployed from the starboard side. We request the use of the starboard crane for these operations. The array is equipped with a strobe light and a radio transmitter (channel 72, 156.625 MHz). The ship shall keep within site of the array while performing CTD operations for the approximately 12 hour duration the array will be in the water. The array will be recovered just at sunset. All radioactive waste generated by the experiment shall be returned to the University of Hawaii. Only authorized personnel shall handle radioactive material.
4.1.4. Profiling Reflectance Radiometer (PRR)
Around noon while at Station ALOHA, a profiling reflectance radiometer will be deployed and retrieved from the main deck starboard side using the port side crane and the winch.
4.2. Station HALE ALOHA (22o27.5'N, 158o7.9'W)
HALE ALOHA is a full-ocean depth Meteorological and Biogeochemical mooring located at approximately 22o27.5'N, 158o7.9'W. A CTD cast to 1000 m will be made at a safe distance from the surface tower. After all operations have been satisfactorily accomplished, the ship will proceed to Snug Harbor.
5.0 EQUIPMENT
5.1 The HOT science party shall be bringing the following:
1. Seabird CTD system, all sensors, deck boxes and computer CTD acquisition
systems.
2. 24-place rosette with 12-l water sampling bottles, all spare parts
3. One laboratory van with assorted equipment for radioisotope and general
use
4. One storage van with assorted equipment.
5. pCO2 equipment with compressed gas cylinders
6. Kevlar line, polypropylene line
7. Go-Flo bottles and teflon messengers
8. Drifting primary production array with light, radio transmitter, floats,
weights
9. Optical sensors
10. Electric winch (440 VAC, 3 phase at 10 amps)
11. Oxygen titration system
12. Plankton nets and towing lines
13. Desktop and laptop personal computers
14. Assorted tools
15. All required sampling bottles
16. All required chemicals and isotopes
17. Liquid nitrogen in dewers
18. UV-VIS spectrophotometer
19. Lead weights
20. Large vacuum waste container
21. Radioactive waste containers
22. Vacuum pumps, water pumps
23. Distilled water
24. Freeze safes and coolers
25. Deck incubators
5.2. We will need the use of the following ship's equipment:
1. Starboard side crane
2. Stern A-frame
3. CTD winch with conducting wire at least 6000 meters long
4. Electric power for winches and vans
5. Radio direction finder
6. Cold and Freezer Rooms
7. Space on the main deck for laboratory van and winches
8. Running fresh water and seawater on main deck
9. Hand-held VHF transceivers
10. Precision depth recorder
11. Shackles, sheaves, hooks and lines
12. Shipboard Acoustic Doppler Current Profiler
13. Capstan
14. Grappling hooks and line
15. Storage space