Hawaii Ocean Time-series (HOT)
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HOT-100: Chief Scientist ReportChief Scientist: D. HEBELHOT 100 Cruise Report R/V Moana Wave (MV 98-26) 7-11 Dec., 1998 Personnel List HOT 100: WOCE group: Fernando Santiago-Mandujano* Research Associate UH Craig Nosse Research Associate UH Mark Vlenciano Electronic Technician UH Don Wright Research Associate UH JGOFS group: Dale Hebel Chief Scientist (co-PI JGOFS) UH Louie Tupas* Scientist (co-PI JGOFS) UH Terrence Houlihan Research Associate UH Lance Fujieki Computer Specialist UH Dan Sadler Research Associate UH Markus Karner Post-Doc UH Karen Bjorkman Research Associate UH Scott Nunnery Research Associate UH Claudia Benitez-Nelson Post-Doc UH Associated projects Albert Calbet Post-Doc UH John Albrough Observer USCG STAG Steve Poulos Electronic Technician UH-UMC Dave Gravatt Deck Technician UH-UMC * Watch Leader Itinerary (approximate HST): ---------------------------- Monday, 7 Dec. 0900 Departed Snug Harbor 0930 Fire/abandon ship drill, science meeting 1155 Arrived Kahe Pt. (Sta. 1) 1205 Weight cast (1020 m) 1300 PRR/TSRB casts 1340 s1c1 1445 Departed Kahe Tuesday, 8 Dec. 0120 Arrived Sta. Aloha (Sta. 2) 0250 Completed sediment trap deployment (22o 45.1N,157o 55.8W) 0405 s2c1 (WOCE deep) 1010 s2c2 (WOCE shallow) 1115 Plankton net tow 1200 Plankton net tow 1230 PRR/TSRB casts 1300 s2c3 1210 PRR-600/TSRB cast 1400 Plankton net tow 1425 Plankton net tow 1600 s2c4 1900 s2c5 2200 s2c6 2310 Plankton net tow 2400 Plankton net tow Wednesday, 9 Dec. 0020 Plankton net tow 0100 s2c7 0235 Go-Flo cast 0410 s2c8 0630 Deployed primary productivity array (22o 44.8N, 157o 59.8W) 0700 s2c9 1005 s2c10 1105 Plankton net tow 1215 PRR-600/TSRB cast 1300 s2c11 1325 Port main engine off line 1330 Restarted port main engine but died when engaged 1345 Port main engine shut down 1400 Visual confirmation of net caught in port propeller 1510 Recovered primary productivity array 1530 Transit Kaena Pt. starboard main engine only Thursday, 10 Dec. 0300 Passing Kaena Pt. 0545 Off Maili Pt. 0730 Divers in the water to clear net 0815 Transit sediment traps 1900 Recovered floating sediment traps (23o 07.0N, 158o 42.0W) 1905 Transit Honolulu Friday, 11 Dec. 0900 Arrived Snug Harbor 1130 Completed limited offloading (HOT 100) and onloading (HOT 100B) operations Narrative: ---------- HOT 100 was conducted aboard the R/V Moana Wave 7-11 Dec. 1998. Captain Stahl was the master of the vessel and Dale Hebel chief scientist. There were a total of 17 participants in the scientific party composed of 4 WOCE, 9 JGOFS, 2 Ancillary (1 USCG observer from the USCG ship Healy) and 2 STAG. We departed Snug on 7 Dec. occupying stations at, Kahe Pt. (sta. 1) and Station ALOHA (sta. 2) although all operations were not completed, at Station ALOHA due to a drifting net which became fouled in the port propeller during CTD cast s2c11. This necessitated returning to the lee of Oahu for diving operations to remove the net. It was feared that the net may also entangle in the starboard propeller totally disabling the vessel. CTD operations were conducted at stations 1 & 2. One CTD cast was conducted at station 1 and eleven CTD casts at Station ALOHA in addition to 3 light casts, 8 net tows, 1 Go-Flo cast, and usual floating sediment traps and productivity operations. All operations were routine with the exception of additional net tows for C. B. Nelson and a rosette Go-Flo primary productivity experiment comparison. All underway measurement systems (thermosalinograph, ADCP, meteorological instruments, and fluorometer) were operable (except pCO2) and functioned normally. The seas were moderate-rough with moderate-high winds and mostly cloudy skies. Due to the rough seas a number of spikes were recorded in some of the continuous measurement data streams and due to the overcast skies no noon sun photometer measurements were conducted. Due to the net problem we were unable to complete the 36 hr 'burst' sampling period, the HPLC cast, 3 net tows and experiments for A. Calbet and K. Bjorkman in addition to the CTD operations at Station 8 (HALE ALOHA). Daily Activities (HST) 2 Dec., 1998 HOT 100 pre-cruise meeting MSB 315 at 1330 hrs. 4 Dec., 1998 Ship loading day. 7 Dec., 1998 Departed Snug Harbor 0900 hrs. After departure at about the mile buoy we had the routine fire/abandon ship drill followed by a short science meeting. It was anticipated that we would experience rough seas due to previous high wind conditions and placed additional emphasis on safty procedures. Arrived Kahe about 1140 hrs and conducted a 1000 m weight cast, PRR/TSRB casts, and final 1000 m CTD cast. All equipment functioned properly and all samples collected. Skies were mostly sunny with 2-4' seas, 3-4' south swell and winds 10-20 kts. Departed Kahe ~1500 hrs. 8 Dec., 1998 Arrived Station ALOHA ~0120 hrs. The transit was bumpy with the ship (and personnel) experiencing significant roll and pitch. From the ride it was doubtful that over-the-side work would be initiated , however, once on station and the ship positioned into the wind over-the-side operations were possible. The sediment trap array was deployed without incident and CTD operations initiated. Six CTD casts were completed including s2c1 (WOCE deep), s2c2 (WOCE shallow), s2c3 (PC/PN), s2c4 (PPO4), s2c5 (JGOFS-1), and s2c6 (JGOfS-2). One PRR/TSRB cast was completed at about noon and 5 net tows conducted. Skies were mostly overcast with brisk Trades 13-25 kts, and sea/swell 3-8'. 9 Dec. 1998 Conducted 5 CTD casts, 3 net tows, 1 PRR/TSRB cast, 1 Go-Flo cast and deployment of primary productivity array before net became entanged in port propeller. During s2c11 the port engine died and although it could be started it continued to die when the propeller shaft was engaged. Following retrieval of the CTD the captain and crew visually determined that a drifting net had become entangled in the port propeller. They were successful in hooking the net with a grapling hook and hoisted aboard a portion of the net. This was secured to a cleat. After discussions with the captain it was decided that we would curtail operations after picking up the floating primary productivity array and steam to the lee of Oahu for diving operations to remove the net. It was deemed too dangerous for diving operations on station due to the sea and swell conditions. The primary productivity array was recovered without incident and we departed Station ALOHA for Kaena Pt. on one enginge at about 1530 hrs. The winds continued to blow Trades at 20-25 kts with 6-8' swells and overcast skies. 10 Dec. 1998 We arrived at the site of diver operations at about 0700 hrs and the net was cleared by about 0800 hrs. From previous Argos positions the drift track of the sediment traps was WNW at a rather rapid rate so we immediately departed after determining that the port propeller was operational and functioning normally. We steamed all day arriving at the trap location at about 1900 hrs and immediately conducted retrieval operations. The recovery went well and we departed for Honolulu shortly after 1900 hs. Winds were Trades 25-28 kts, swell 8-12' and skies mostly cloudy with a clearing trend. 11 Dec. 1998 Arrived Snug Harbor 0900 hrs. Offloading for HOT 100 and onloading for HOT 100B was completed before noon. Weather ------- HOT 100: The weather was mostly cloudy with high winds and rough seas. Below is listed the cruise bridge log descriptions and the various values represent the range for that day. Under wind, sea, and swell there will be two designations, the first is the direction (in degrees), the second for wind is in kts, sea in Beauford force, and swell in feet, barometer in inches of Hg, temp oC (dry bulb) and clouds in tenths. Day Date Wind Sea Swell Barometer Temp Clouds Mon 7 Dec. 075-105,18-24 075-105,3-5 090-120,4-8 30.05-30.14 72-79 10 Tues 8 Dec. 090-115,13-25 090-115,3-4 100,6-8 30.09-30.15 74-76 9-10 Wed 9 Dec. 085-090,20-25 080-090,3-4 100,6-8 30.08-30.14 74-76 9-10 Thur 10 Dec. 000-090,05-28 000-090,1-5 320-340,3-12 30.14-30.19 75-77 4-10 Fri* 11 Dec. 090,25 090,4 330,8 30.18 75 3 *Only one entries (0200 hrs) Equipment and methods: ---------------------- All standard equipment functioned properly Sub component programs: ----------------------- Investigator: Project: ------------- -------- Christopher Winn (UH) DIC, pH, Alk., pCO2/UH Bob Bidigare (UH) HPLC pigments/UH Michael Landry (UH) zooplankton dynamics/UH Ancillary programs: ------------------- Investigator: Project: ------------- ---------- Charles Keeling (SIO) CO2 dynamics and intercalibration/SIO Paul Quay (UW) DIC and 13C/UW Ed Boyle trace metals/MIT John Porter aerosols/UH Ken Smith benthic respiration studies Students: --------- Karin Bjorkman phosphorus experiments/UH Others: ------- Dale Hebel EOC measurements/UH Markus Karner molecular probe samples/UH Albert Calbet zooplankton feeding/UH |