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Loading: November 16, 1994 Departed: November 17, 1994 at 0900 Returned: November 21, 1994 at 1600 Vessel: R/V Moana Wave Operator: University of Hawaii Chief Scientist: Dr. Louie Tupas Master: Captain John Stahl Deck Operations: Mr. Clary Getzeit Electronics Technician: Mr. Will Hervig 1. SCIENTIFIC OBJECTIVES The primary objective of the cruise was to maintain the collection of hydrographic and biogeochemical data at the Hawaii Ocean Time-series (HOT) station. The HOT station, also known as Station ALOHA (A Long Term Oligotrophic Habitat Assessment) is defined as a circle with a 6 nautical mile radius centered at 22o45'N, 158oW. Free- drifting sediment traps were planned for deployment for approximately 72 hours from the site to measure sedimentation rates of particulate matter. CTD casts at three hour intervals were planned to obtain temperature, salinity, dissolved oxygen, flash fluorescence and beam attenuation profiles. Water samples for analysis of dissolved nutrients, gases, and biomass were to be collected with the CTD casts . Another free-drifting array to conduct a primary production experiment was planned for a 12 hour deployment. Three other stations were planned to be occupied during this cruise; Kahe Point Station (21o20.6'N, 158o16.4'W), Kaena Point Station (21o50.76'N, 158o21.84'W), and Station 3 (23o25'N, 158oW). Other research objectives such as the collection of water samples for ancillary investigations and experiments were to be conducted as time permitted. 2. SCIENCE PERSONNEL Luis Tupas - UH, JGOFS Georgia Tien - UH, JGOFS Ursula Magaard - UH, JGOFS Jacqueline Johnson - UH, JGOFS Lance Fujieki - UH, JGOFS Renate Scharek - UH, JGOFS Karin Bjorkmann - UH, JGOFS Jefrey Snyder - UH, WOCE Craig Nosse - UH, WOCE Deborah Schulman - UH, WOCE Jinchun Yuan - UH, WOCE Daniel Sadler - UH, Carbon Project Karen Selph - UH, Zooplankton Project Christopher Measures - UH, Trace Metal Project Rebecca Reitmeyer - UH, Trace Metal Project Mikel Latasa - UH, Pigment Project 3. GENERAL SUMMARY Because of inclement weather and rough sea conditions, only the core objectives of the JGOFS and WOCE programs were accomplished. Only Stations Kahe, Kaena and ALOHA were occupied. When the weather condition allowed for CTD operations, all core samples were taken within the 36 hour CTD burst sampling period. All samples for ancillary projects were taken. The floating sediment trap and primary production experiment was not conducted. The deep cast was conducted as the last operation and the ship headed for Honolulu on the morning of November 21. Zooplankton net tows were not possible because of the weather. The ship docked at Snug Harbor at 1600. 4. R/V MOANA WAVE, OFFICERS AND CREW, TECHNICAL SUPPORT The R/V Moana Wave continues to maintain the excellent ship support for our work. Despite the extreme weather conditions, we were still able to conduct the core work. The officers and crew were most helpful and constantly concerned about our safety. They gave excellent recommendations towards 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 November 16, 1994; Loading Day All equipment was moved from either SNUG Harbor labs or UH that day. All electrical and electronic connections were made for the CTD. All lab equipment were stowed away and secured. All instruments were tested and appeared functioning. No problems were encountered. November 17, 1994 All hands arrived on ship at 0830. Ship departed at 0900. Fire and emergency drills conducted at 0945 followed by safety briefing by first mate. Arrived Kahe Point Station at 1200. Conducted weight cast, PNF cast and 1000 m CTD cast. All operations and sampling accomplished by 1530. Surface water sampler deployed and towed to during transit to Station Kaena. Arrive Station Kaena at 1730. Conduct CTD to near bottom, completed at 2130, slowly started transit to Station ALOHA while sampling. Surface sampler towed from Kaena to Station ALOHA. Weather and seas becoming increasingly rough. Gale force winds and high seas expected. All equipment secured. Transit is slow due to increasing seas. November 18, 1994 Arrive at the center of Station ALOHA at 0500. Because of rough sea state the sediment trap array was not deployed. Winds 35-40 knots with 15-18 foot seas. All work suspended and ship positioned to ride out the weather. November 19, 1994 Attempt CTD cast at 0800. Weather has improved slightly but are taking extra precautions for tagging CTD package. CTD casts continued at 3 hour intervals. Go-Flo cast and primary production array deployment aborted. CTD casts continued at 3 hour intervals. PNF cast and zooplankton tow also aborted. November 20, 1994 Burst sampling continued at 3 hour intervals. Attempt for a zooplankton net tow aborted when science members were overcome by large wave that swept over the deck. Chief Scientist was injured in the accident. Fortunately he received only minor scratches and muscle pains in the abdominal region which did not last. Last CTD cast, the deep cast commenced at 2315. November 21, 1994 Deep cast accomplished at 0345. Moana Wave transiting to Honolulu. Arrived at 1600 ANCILLARY INVESTIGATIONS AND SPECIAL PROJECTS 1. Trace metal sampling and analysis - C. Measures, R. Reitmeyer 2. Pigment experiments - M. Latasa 3. DIC sampling - D. Sadler SAMPLES TAKEN FOR OTHER INVESTIGATORS 1. DIC samples for C.D. Keeling, SIO-UCSD 2. DIC samples for P. Quay, UW 3. Silica samples for H. Thierstein, Zurich 4. Iodine samples for G. Luther
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Last modified: January 00, 1998