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


HOT-102: Chief Scientist Report


Chief Scientist: D. HEBEL


HOT 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