Hawaii Ocean Time-series (HOT)
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HOT-102: Chief Scientist ReportChief Scientist: D. HEBELHOT 102 Cruise Report R/V Moana Wave (MV 99-04) 16-20 Feb., 1999 Personnel List HOT 102: 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 Lance Fujieki Computer Specialist UH Dan Sadler Research Associate UH Karen Bjorkman Research Associate UH Ursula Magaard Research Associate UH Associated projects Albert Calbet Post-Doc UH Scott Nunnery Research Associate UH Claudia Benitz-Nelson Post-Doc UH STAG Will Hervig Electronic Technician UH-UMC Dave Gravatt Deck Technician UH-UMC * Watch Leader Itinerary (approximate HST): ------------------------------ Tuesday, 16 Feb. 0900 Departed Snug Harbor 0930 Fire/abandon ship drill, science meeting 1155 Arrived Kahe Pt. (Sta. 1) 1210 Weight cast (1020 m) 1250 PRR/TSRB casts 1340 s1c1 1455 Departed Kahe Wednesday, 17 Feb. 0000 Arrived Sta. Aloha (Sta. 2) 0025 Net tow 0045 Net tow 1450 Completed sediment trap deployment (22o 46.2'N,157o 59.0'W) 0200 Underway HALE ALOHA 0500 Arrive HALE ALOHA 0520 s8c1 0655 Trace metal sampler deployed 655 HALE ALOHA zodiac op's 0745 Depart Sta. ALOHA 1000 Arrived Sta. ALOHA 1005 Net tow 1110 s2c1 1310 PRR-600/TSRB cast 1345 Net tow 1410 Net tow 1435 s2c2 (WOCE deep) 2000 s2c3 2230 s2c4 2350 Net tow Thursday, 18 Feb. 0010 Net tow 0035 Net tow 0100 s2c5 0200 Net tow 0230 Go-Flo cast 0400 s2c6 0600 Deployed primary productivity array (22o 45.08'N, 158o 00.52'W) 0710 s2c7 1005 s2c8 1240 PRR-600/TSRB cast 1305 s2c9 1410 Net tow 1430 Net tow 1600 s2c10 1820 Recovered PP array 1900 s2c11 2200 s2c12 Friday, 19 Feb. 0100 s2c13 0240 Pump tanks 0415 s2c14 (second WOCE deep cast) 0720 CTD on deck 0940 Transit sediment traps 1025 Recovered floating sediment traps (?N, ?W) 1250 Arrived HALE ALOHA mooring (22o 24.94'N, 158o 09.57'W) 1310 Zodiac op's 1330 Zodiac op,s completed 1405 s8c2 1505 Trace metal surface cast 1815 Transit Snug Saturday, 20 Feb. 0800 Arrived Snug Harbor Narrative: ---------- HOT 102 was conducted aboard the R/V Moana Wave 16-20 February 1999. Captain Hayes was the master of the vessel and Dale Hebel chief scientist. There were a total of 14 participants in the scientific party composed of 4 WOCE, 5 JGOFS, 3 Ancillary and 2 STAG. We departed Snug on 16 February occupying stations at, Kahe Pt. (sta. 1), Station ALOHA (sta. 2), and station 8 (HALE ALOHA). All scheduled work was completed and all samples collected. CTD operations were conducted at stations 1,2 & 8. One CTD cast was conducted at station 1, 14 CTD casts at Station ALOHA and 1 CTD cast at station 8. Other over-the-side operations included 3 light casts, 11 net tows, 1 Go-Flo cast, floating sediment traps and productivity operations. All operations were routine with the exception of additional net tows for C. B. Nelson, a rosette Go-Flo primary productivity experiment comparison and zodiac operations at HALE ALOHA to replace the malfunctioning Argos transmitter. All underway measurement systems (thermosalinograph, ADCP, meteorological instruments, and fluorometer) were operable (except pCO2) and functioned normally. The weather was variable with mostly sunny skies and calm seas through most of the cruise with high winds and moderate-rough seas toward the end. Daily Activities (HST) Tuesday 9 Feb., 1999 HOT 102 pre-cruise meeting MSB 315 at 1400 hrs. Friday 12 Feb., 1999 Ship loading day. Tuesday 16 Feb., 1999 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 to review the schedule and safety concern. Arrived Kahe 1155 hrs and conducted a 1020 m weight cast, PRR/TSRB casts, and final 1020 m CTD cast. Although all equipment functioned properly and all samples collected there were some minor problems with the primary oxygen sensor drifting and PC laptop tests. Skies were mostly sunny with 2' seas, 4' swell and light winds. VOG conditions were present. Departed Kahe ~1500 hrs. Wednesday, 17 Feb., 1999 Arrived Station ALOHA ~0000 hrs. Following completion of two net tows and deployment of the sediment traps we departed Station ALOHA for station 8. At station 8 we conducted an unsuccessful surface trace metal cast (sampler malfunctioned), CTD cast (s8c1) with again some minor DO sensor problems and zodiac operations to remove/replace the malfunctioning Argos transmitter. Following these activities we departed station 8 for Station ALOHA 0745 hrs. Once on station we conducted 4 net tows, PRR/TSRB light cast, satellite over-fly aerosol/ozone measurements, and 4 CTD casts include one deep cast. The IES signal was picked up on the 12 khz recorder. Skies were mostly clear with light winds and calm seas. Thursday 18 Feb. 1999 Conducted 8 CTD casts, 5 net tows, 1 PRR/TSRB cast, 1 Go-Flo cast and deployment/recovery of primary productivity array. Continued testing of the PC laptop and continuing problems with CTD DO sensor drift. Increased ship roll has slowed CTD decent/ascent rate. The winds have increased and turned to Trades at 10-15 kts. Seas have increased to 2-3' with a 5' swell. Skies are mostly cloudy. Friday 19 Feb. 1999 Winds, seas and swell continue to increase. Three CTD casts completed included a second WOCE deep cast and one cast at station 8. Winch speeds decreased due to ship roll. Departed Sta. ALOHA at 0940 to intercept floating sediment traps which have drifted almost due south. Sediment traps recovered at 1000 hrs at 22o 39.7'N, 157o 58.6'W. Arrived HALE ALOHA mooring 1250 hrs and conducted zodiac operations once again to replace Argos battery pack and transmitter. The unit initially installed at the beginning of the cruise did not work properly so one of the sediment trap transmitters was used along with a new double capacity battery pack. Also, conducted surface trace metal cast. Departed station 8 1815 hrs for Honolulu. Winds continue Trades and have increased rapidly following zodiac operations to > 25 kts, seas an swell at 3-6' and skies mostly cloudy. 20 Feb. 1999 Arrived Snug Harbor 0800 hrs. Offloading completed before noon. Weather ------- HOT 102: The weather was variable with mostly sunny skies and calm seas at the beginning of the cruise to strong winds and moderate-rough seas at the end. 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 Tues 16 Feb. 010-240,5 010-240,2 180-330,4 30.13-30.20 72-79 2-5 Wed 17 Feb. light-var, 080,1-2 330,4-5 30.10-30.18 71-79 2-6 Thur 18 Feb. 060-090,10-15 060-080,2-3 340,5 30.08-30.14 72-76 2-9 Fri 19 Feb 065-075,15-27 060-075,3-5 030-350,5-6 30.06-30.13 72-76 5-10 Sat*20 Feb. 070-080,20 070-080,3 110-150,3 30.06-30.08 74-75 3-6 *Only two entries (0200 & 0600 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 Abbott/Letelier optical measurements/OSU Students: --------- Karin Bjorkman* phosphorus experiments/UH Others: ------- Dale Hebel* EOC, 1o prod. comparison/UH Albert Calbet* zooplankton feeding/UH *Opportunistic Tricodesmium collections |