Hawaii Ocean Time-series (HOT)
in the School of Ocean and Earth Science and Technology at the University of Hawai'i at Manoa


HOT-100: Chief Scientist Report


Chief Scientist: D. HEBEL


                       HOT 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