Hawaii Ocean Time-series (HOT)
in the School of Ocean and Earth Science and Technology at the University of Hawai'i at Manoa |
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HOT Process Cruise 1: Chief Scientist ReportChief Scientist: L. TUPASHawaii Ocean Time-series HOT Process Cruise 1999; Chief Scientist's Report Vessel: R/V Ka' Imikai O'Kanaloa, University of Hawaii Master of the Vessel: Captain Robert Hayes Chief Scientist: Dr. Louie Tupas Deck Technician: Mr. Dave Gravett Electronics Technician: Mr. Will Hervig Loading: November 24, 1999 Departure Leg 1: November 27, 1999 @ 0900 Arrival Leg 1: December 1, 1999 @ 0800, Snug Harbor Departure Leg 2: December 1, 1999 @ 1000 Arrival Leg 2: December 4, 1999 @1800 Unloading: December 4, 1999 1. SCIENCE PERSONNEL Leg 1 Luis Tupas - UH Scientist Dale Hebel - UH Scientist Karin Bjorkman - UH Scientist Markus Karner - UH Scientist Daniel Sadler - UH Research Associate Sarah Kerr- UH Research Associate Leg 2 Luis Tupas - UH Scientist Brian Popp - UH Scientist Frank Sansone - UH Scientist Daniel Sadler - UH Research Associate Lance Fujieki- UH Research Associate Nicholas Cassar - UH Graduate Student Marian Westley - UH Graduate Student Laura Galvez - Visiting Graduate Student 2. GENERAL SUMMARY The objective of the cruise was to collect water samples and conduct experiments at the HOT study site, Station ALOHA. During Leg 1, a primary production experiment using a free-floating array was conducted each day. Water samples were collected using STAG's CTD-Rosette system with some HOT electronic components. During Leg 2 a free-drifting sediment trap array was deployed at Station ALOHA and retrieved for sampling and redeployment at 12 and 24 hours before final retrieval at 48 hours. All objectives of the cruise were accomplished. Guest scientists and students were able to accomplish their work. Floating sediment trap array and primary production array deployed and recovered successfully. No samples were lost during the in-situ incubations. 3. R/V Ka Imikai O Kanaloa, OFFICERS AND CREW, TECHNICAL SUPPORT Ship's crew gave excellent support and showed enthusiasm and concern for our work and were very flexible in receiving changes in our operational schedule and logistical support. 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. 4. DAILY REPORT OF ACTIVITIES November 24, 1999; Loading Day The ship's main deck was configured for HOT equipment. The main lab van and the rope winch were secured inside the submarine hangar. The equipment van and second radiation van were secured on the O-2 deck. All deck and lab equipment were loaded and secured within the ship's labs. All electrical and electronic connections were made for the CTD. All other equipment and containers were stowed away and secured. All laboratory instruments were tested and appeared functioning. No problems were encountered. November 27, 1999; start of Leg 1 We departed Snug Harbor at 0900. Fire and abandon ship drills were held at around 0930. We arrived at Station Kahe at 120. The CTD was tested and we departed Station Kahe at 1400 for Station ALOHA. November 28, 1999 Ship arrived at Station ALOHA at 0000. A Go-Flo cast was made at 0300 for the first primary production experiment. The array was deployed at 0600. A CTD cast was made at 0800 for ammonium measurement by Sarah Kerr, archaea counts by Markus Karner, phosphrous experimetns by Karin Bjorkman, and the mixing experiment by Louie Tupas and Dale Hebel. A CTD cast was made at 1400 for Karner and Bjorkman. The primary production array was retrieved at 1700. A CTD cast was made at 2000 for Karner. November 29, 1999 Work continues as scheduled. Go-Flo cast commenced at 0300. Primary production experiment was deployed without incident at 0600. CTD casts made at 0800 and 1400. Primary production experiment retrieved at 1700 and all samples processed shortly after. November 30, 1999 Work has been proceeding as scheduled without any problems. Go-Flo cast started at 030o. We received the ARGOS positions by email. . Primary production experiment was deployed without incident at 0600. CTD casts made at 0800 and 1400. Primary production experiment retrieved at 1700 and all samples processed shortly after. Ship then proceeded to Honolulu at 1900. December 1, 1999; end of Leg 1, start of Leg 2 Ship arrived at Snug Harbor at 0700. Personnel and equipment were exchanged. We departed Snug Harbor at 1000. Fire and abandon ship drills were held at around 1030. Ship proceeded directly to Station ALOHA. December 2, 1999 Ship arrived at Station ALOHA at 0000. A CTD cast was made at 0400 to collect water for Popp et al. Sediment traps were deployed at 0600. A short Go-Flo casts was made at 0900. A CTD cast was made at 1000 and 1600. Sediment traps were retrieved and deployed at 1800. A CTD cast was made at 2200. December 3, 1999 Sediment traps were retrieved and deployed at 0600. CTD casts were made at 1000, 1600 and 1900. December 4, 1999 Sediment trap array was finally retrieved at 0600. Ship began transti to Honolulu at 0700. We arrived at Snug Harbor at 1700 and proceed with offload. Experiments done by core group 1) Profile of leucine uptake 2) Leucine uptake experiments using deck incubations 3) Water mixing experiment Ancillary investigations done during cruise. 1) Phosphorus experiments by Karin Bjorkman 2) Archaea determiantions by Markus Karner 3) Nitrous oxide experiments by Brian Popp et al. 4) Ammonium determinations by Sarah Kerr 5) Organic matter sampling by Laura Galvez |