HOT-118: Chief Scientist Report

Chief Scientist: D. HEBEL

HOT 118 Cruise Report
R/V Kaimikai O Kanaloa 
21-25 Aug., 2000


Personnel List

HOT 118:		
WOCE group:
Fernando Santiago-Mandujano* 	Research Associate		UH
Lal Ratnapala             	Graduate Assistant              UH
Mark Valenciano			Electronic Technician		UH
Jerimiah Johnson		Research Associate		UH

JGOFS group:
Dale Hebel              	Chief Scientist (co-PI JGOFS)  	UH
Lance Fujieki			Computer Specialist		UH
Colleen Allen			Research Associate 		UH
Matt Church			Visiting Graduate Student 	UH
Markus Karner			Scientist			UH
Jennifer Brum			Student Assistant		UH/HPU
Terry Houlihan*			Research Associate 		UH
Karin Bjorkman			Scientist			UH

Associated projects:
Tom Gregory			Research Associate		UH
Roberta Hamme			Graduate Student		UW

STAG
Steve Poulos               	Electronic Technician       	UH-UMC
Dave Gravatt             	Deck Technician              	UH-UMC

*Watch Leader




Itinerary (approximate HST):

Monday, 21 Aug.
0900	Departed Snug Harbor 
0925	Fire/abandon ship drill, science meeting    
~1200	Arrived Kahe Pt. (Sta. 1)
1215 	Weight cast (1000 m)
1255	PRR/TSRB casts 
1340 	s1c1
1450	Departed Kahe 
2355	Arrived Sta. Aloha (Sta. 2)


Tuesday, 22 Aug. 	
0010	Net tow
0040 	Net tow
0110	s2c1(100m)
0125 	s2c1 on deck
0140	Began sediment trap deployment
0225 	Completed sediment trap deployment (22o 45.5N, 157o 59.3W)
0305	s2c2 (WOCE deep)
0450	s2c2 retrieving from 4750 db
0650	s2c2 on deck
0840	s2c3 (WOCE shallow) 
1000  	Net tow
1030	Net tow 
1100	s2c4
1200	PRR-600/TSRB cast
1300	Net tow
1330  	Net tow	 
1405 	s2c5
1515 	in situ pumping
1635	in situ pump on deck
1705 	s2c6 (rosette hit side of ship on deployment, recovered for inspection)
1740	s2c6 (redeployed)
2000	s2c7
2200	Net tow 
2235	Net tow
2300	s2c8


Wednesday, 23 Aug.
0100	Net tow
0130	Net tow	
0200	s2c9
0350  	Go-Flo cast (25 & 45m bottle comparison experiment)	
0510	s2c10
0610	Deployed primary productivity array (22o 45.18N, 157o 58.41W)
0800	s2c11
0940	No ADF signal from PP array, looking for PP array
1005 	Spotted PP array, spar buoy underwater
1015 	Hooked PP array floats, buoy recovered and extra flotation added
1030	Spar and floats redeployed
1100 	s2c12
1200 	PRR-600/TSRB cast
1255 	Net tow
1330	Net tow
1410	s2c13
1505	in situ pump (in)
1620	in situ pump (out)
1700	s2c14
1930	Recovered PP array (22o 43.40N, 158o 1.76W)
2000 	s2c15 
2300 	s2c16 (rescheduled HPLC cast, 200 db)
2330	Transit HALE ALOHA	


Thursday 24 Aug.
0200	Arrive HALE ALOHA (night light not working)
0215	s8c1
0325	Transit sediment traps 
0510	Arrived sed. traps
0630	Hooked trap array   
0715	Completed sed. trap recovery (location ???)
0900	Arrived HALE ALOHA
0955	Kahuku transect
1345 	CPA Kahuku Pt. ((21o 43.7N, 157o 59.9W), transit Kaena
1545 	Arrive Kaena Pt. (sta. 6)
1705	s6c1 
1715 	CTD on deck (100 m test cast)
1800 	s6c2 
1850 	CTD at 2500 m
1945	CTD on deck and began Honolulu transit

Friday 25 Aug.
0715	Arrive Snug Harbor; commenced complete offload 
 


Narrative:

HOT 118 was conducted aboard the R/V Kaimikai O Kanaloa (KOK), 21-25
August, 2000.  Captain Hayes was the master of the vessel and Dale
Hebel chief scientist.  There was a total of 16 participants in the
scientific party composed of 4 WOCE, 8 JGOFS, 2 ancillary investigators
and 2 STAG.

We departed Snug on 21 August occupying stations at Kahe Pt. (sta. 1),
Station ALOHA (sta. 2), HALE ALOHA (sta.  8) and Kaena Pt. (sta. 6).
All scheduled work was completed and all samples collected.  CTD
operations were conducted at stations 1, 2, 8 and 6.  One ~1000 m CTD
cast was conducted at station 1 & 8; 2 <250m, 13 ~1000 m, one ~2000m and
one ~4800 m CTD casts at Station ALOHA; one ~2500m CTD cast at Kaena
Pt. (sta.6).  Other over-the- side operations included [3] light casts,
[12] net tows, 2 in situ pumping operations, 1 Go-Flo cast, floating
sediment traps and primary productivity measurements.  All operations
were routine with the exception of additional net tows for C. B. Nelson
(which by now are routine), an external Niskin /Go-Flo primary
productivity comparison, in situ pump operations (again almost routine)
and addition of sta. 6 with secondary CTD testing.

The underway/continuous thermosalinograph, ADCP, and fluorometer were
operable and functioned properly. WOCE met. obs and limited ship met.
data were collected as well as aerosol measurements on 23 Aug.  Overall
the weather was partly cloudy with moderate to rough seas and 15-30 kt
Trades.

At Sta. ALOHA the day-day cruise schedule was very similar to HOT 111,
however on HOT 118 we occupied sta. 8 (HALE ALOHA) before picking up
the floating sediment traps, ran a transect from Sta. ALOHA to offshore
of Kahuku and occupied our old sta. 6 (Kaena Pt.) on the return leg.
Therefore, for those interested  in our daily activities please see HOT
111 Cruise Report for generic narrative of Sta. ALOHA activities
(applicable dates Feb. 1-4, 2000).



Weather

The weather was variable with partly cloudy skies and moderate-rough
seas at the beginning of the cruise and moderate-strong winds
decreasing to moderate conditions towards the end.  Below is listed the
cruise bridge log descriptions and the various values representing 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 21 Aug. 	065-095,19-22 	065-095,3  070-130,4-5	29.96-30.04  73-77  7-9
Tues 22 Aug.	085-110,24-28 	05-110,4   090,8  	29.99-30.04  75-78  7-10
Wed 23 Aug. 	085-95,18-22 	85-095,3   090,6-8 	29.97-30.02  76-83  3-4
Thur 24 Aug.	085-090,19-24 	085-090,3  090,6-8	29.96-30.03  76-82  3-9
Fri. 25 Aug.*	090,15		090,2	   140,2	29.98	     77	    2

*One entry  (0200 hrs)



Equipment and methods:

All standard equipment functioned properly with the exception of the
primary productivity array spar buoy.  Apparently there was a crack in
the spar which received a temporary fix which was ineffective.  After
deployment the bridge lost the radio transmitter signal and noticed
that the spar was underwater.  Subsequently, the spar was retrieved and
redeployed with additional floatation composed of extra surface floats
secured around and to the center of the spar.
 

Sub component programs:

Investigator:               	Project:
-----------------              	----------
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
John Porter			aerosols/UH
Abbott/Letelier			optical measurements/OSU
Claudia Benitez-Nelson		phosphorus isotopes,Th234/UH

Students:
Matt Church			DOC, Archea dynamics/UH
Jennifer Brum			phycoerythrin distributions/UH


Others:
Hebel, Dore, Karl, Tupas	EOC, 1o prod. comparison/UH
Karin Bjorkman			phosphorus experiments/UH


Notable events:
1. Addition of sta. 6
2. Sinking of pp spar buoy 
3. Testing of secondary ctd sensors sta. 6