HOT-101: Chief Scientist Report Chief Scientist: D. HEBEL HOT 101 Cruise Report R/V Moana Wave (MV 99-01) 11-15 Jan., 1999 Personnel List HOT 101: 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 Scott Nunnery Research Associate UH Claudia Benitz-Nelson Post-Doc UH Ursula Magaard Research Associate UH Stephanie Christensen Research Assistant UH Associated projects: Ken Smith Scientist SIO Roberta Baldwin Scientist SIO Robert Glatts Scientist SIO Jim Carlson Research Engineer Seabird Terri Rust Research Associate UH Eileen McCusker Technician MSU STAG Will Hervig Electronic Technician UH-UMC Dave Gravatt Deck Technician UH-UMC * Watch Leader Itinerary (approximate HST): ---------------------------- Monday, 11 Jan. 0900 Departed Snug Harbor 0935 Fire/abandon ship drill, science meeting 1205 Arrived Kahe Pt. (Sta. 1) 1215 Weight cast (1000 m) 1250 PRR/TSRB casts, aerosol measurements 1355 s1c1 1500 Departed Kahe Tuesday, 12 Jan. 0000 Arrived Sta. Aloha (Sta. 2) 0010 Net tow 0030 Net tow 0100 Transit FVGR deployment site 0150 Arrived deployment site 0215 FVGR deployed (22° 53.6'N,157° 58.7'W) 0225 Transit station ALOHA 0320 On station 0510 Completed sediment trap deployment (22° 46.18'N,157° 59.78'W) 0605 s2c1 (WOCE deep) 1000 Net tow 1030 Net tow 1105 s2c2 1245 PRR-600/TSRB cast, aerosol measurements 1315 Net tow 1340 Net tow 1405 s2c3 1700 s2c4 2000 s2c5 2200 Net tow 2230 Net tow ??? 2300 s2c6 Wednesday, 13 Jan. 0005 Net tow 0030 Net tow 0200 s2c7 0345 Go-Flo cast 0505 s2c8 0655 Deployed primary productivity array (22° 45.06'N, 157° 59.97'W) 0805 s2c9 1105 s2c10 1215 PRR-600/TSRB cast 1330 Net tow 1405 s2c11 1705 s2c12 1845 Recovered PP array 2000 s2c13 2300 s2c14 Thursday, 14 Jan. 0035 Pump tanks 0300 s2c15 (second WOCE deep cast) 0610 CTD on deck 0745 Arrived FVGR recovery site 0815 FVGR on deck 0830 Transit sediment traps 1145 Recovered floating sediment traps (22° 45.0'N, 158° 21.2'W) 1425 Arrived HALE ALOHA mooring (22° 24.94'N, 158° 09.57'W) 1615 s8c1 1830 Transit Snug Friday, 15 Jan. 0730 Arrived Snug Harbor Narrative: ---------- HOT 101 was conducted aboard the R/V Moana Wave 11-15 Jan. 1999. Captain Hayes was the master of the vessel and Dale Hebel chief scientist. There were a total of 20 participants in the scientific party composed of 4 WOCE, 8 JGOFS, 6 Ancillary and 2 STAG. We departed Snug on 11 Jan. occupying stations at, Kahe Pt. (sta. 1), FVGR site, Station ALOHA (sta. 2) and station 8 (HALE ALOHA). All routine operations were carried out without problems and the FVGR (Ken Smith - SIO) was deployed and retrieved successfully. Seabird research engineer Jim Carlson tested a prototype dissolved oxygen sensor with good results. CTD operations were conducted at stations 1, 2 and 8. One CTD cast was conducted at station 1 and 8 while 15 CTD casts were completed at Station ALOHA in addition to 3 light casts, 11 net tows, 1 Go-Flo cast, and usual floating sediment traps and productivity measurements. All operations were routine with the exception of additional net tows for C. B. Nelson, rosette Go-Flo primary productivity comparison, prototype dissolved oxygen testing and deployment/retrieval of the FVGR. All core samples were collected. All underway measurement systems (thermosalinograph, ADCP, meteorological instruments, and fluorometer) were operable (except pCO2) and functioned normally. The seas were moderate with increased winds throughout the cruise. Sun photometer (aerosol) measurements were made only on the first two days of the cruise with cloudy conditions thereafter during the noon satellite overpass. Daily Activities (HST) 7 Jan., 1999 HOT 101 pre-cruise meeting MSB 315. 8 Jan., 1999 Ship loading day. 11 Jan., 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. Arrived Kahe about 1200 hrs and conducted a 1000 m weight cast, PRR/TSRB casts, aerosol measurements and final 1010 m CTD cast (s1c1). All equipment functioned properly and all samples collected. Skies were mostly sunny with calm seas, 5' nnw swell and light winds. Departed Kahe ~1500 hrs. 12 Jan., 1999 Arrived Station ALOHA ~0000 hrs conducted two net tows before proceeding to FVGR deployment site. The FVGR (Ken Smith - SIO) was successfully deployed approximately 2.5 nm north of the circle perimeter. After arriving at the center of Sta. ALOHA we deployed the floating sediment traps and initiated CTD operations. 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 5-6 additional net tows conducted. Aerosol measurements were made from the 02 deck in conjunction with the satellite overpass. The IES signal was detected with the 12 khz receiver and dissolved oxygen hysteresis problem were noted for the primary sensor on various casts. Skies were mostly sunny with moderate Trades at 12-18 kts, and sea/swell 3-5'. 13 Jan. 1999 All work progressed without problems and according to schedule. Weather was good with light trades and relatively flat seas. Conducted 8 CTD casts collecting samples for primary productivity rosette/go-flo comparison (s2c7), ATP (s2c9), P. Si (s2c11) and HPLC pigments (s2c14). Also deployed/retrieved PP array, conducted 3 net tows, 1 PRR/TSRB cast and 1 Go-Flo cast. No aerosol measurements were made due to overcast skies. 14 Jan. 1999 The weather remained favorable although we did have a period of extended cloudiness the previous day as a front passed. Work progressed according to schedule and all equipment functioned properly. Jim Carlson has gotten good/excellent results with his prototype oxygen sensor and a wealth of data. Terri and Eileen were very busy making the most of every sampling opportunity for their N20 work while Karin and Claudia conducted additional sample collection/experiments related to their research interests. In addition, Scott and Stephanie conducted a number of zooplankton grazing experiments. After completing the 36 "burst" sampling we ended CTD work at Station ALOHA with a second WOCE deep cast (s2c15) prior to the successful recovery of the FVGR by Ken Smith's group. Following retrieval of the floating sediment traps (drifted almost due west), we steamed to HALE ALOHA (station 8) for our final CTD cast (s8c1) before returning to Honolulu. 15 Jan. 1999 Arrived Snug Harbor 0730 hrs. Weather ------- HOT 101: The weather was variable with light-moderate winds and seas with generally clear skies at the beginning of the cruise with increasing cloudiness thereafter. 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 °C (dry bulb) and clouds in tenths. Day Date Wind Sea Swell Barometer Temp Clouds Mon 11 Jan. 080-085,lt-24 080-085,3-4 120-330,5 30.07-30.14 72-78 1-4 Tues12 Jan. 085-120,12-18 085-120,3 330,2-5 30.12-30.14 71-80 3-7 Wed 13 Jan. 080-090,12-14 070-090,3 330,3-4 30.12-30.15 73-78 3-9 Thur14 Jan. 080-100,18-22 080-100,4 330,3-4 30.13-30.19 73-74 3-8 Fri*15 Jan. 065-070,5-14 065-070,1-3 110-330,3 30.13-30.14 74 0-3 *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 Ken Smith benthic respiration studies Popp/Holstrom NO2 dynamics Abbott/Letelier optical measurments Claudia Benitz-Nelson phosphorus natural abundance Students: --------- Karin Bjorkman phosphorus experiments/UH Others: ------- Dale Hebel EOC measurements, PP comparison/UH Nunnery/Christensen zooplankton feeding/UH