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


HOT-91: Chief Scientist Report


Chief Scientist: D. HEBEL


                                HOT 91 Cruise Report
                                   R/V Moana Wave
                                 16-20 March, 1998
                              

Personnel List

HOT 91:

WOCE group:
Fernando S-Mandujano*  	Research Associate		UH
Craig Nosse             Research Associate		UH
Mark Vlenciano          Electronic Techician		UH
Don Wright              Research Associate            	UH
Eric Firing             Scientist (PI WOCE)		UH

JGOFS group:
Dale Hebel              Chief Scientist (co-PI JGOFS)	UH
Stuart Donachie         Post-Doc                 	UH
Terrence Houlihan*      Research Associate		UH
Lance Fujieki           Computer Specialist           	UH
Pat Driscoll            Research Associate            	UH
Markus Karner           Post-Doc                 	UH
Karen Bjorkman          Research Associate            	UH
Stephanie Christensen   Graduate Student		UH
Scott Nunnery           Research Associate            	UH


Ancillary projects
Daryl Slocum          					Sontek
John Porter             Scientist                     	UH
Leslie Cotton           Undergraduate                 	UH


STAG
Sharon Stahl            Electronic Technician		UH-UMC
Dave Gravatt            Deck Technician			UH-UMC

* Watch Leader



Itinerary (approximate local time):
----------------------------------

     Monday,  16 March

     0940 Departed Snug Harbor (departure delayed due to auto-pilot 
          malfunction)
     1020 Fire and Abandon ship drill, science meeting
     1230 Arrived Kahe Pt. (Sta. 1)
     1250 Weight cast
     1340 TSRB cast
     1410 PRR-600 cast
     1505 s1c1 (LADCP deployed as part of rosette package)
     1630 Departed Kahe
     
     Tuesday,  17 March

     0000 Arrived Aloha (Sta. 2)
     0110 Plankton net tow
     0220 Completed sediment trap deployment  (22o 42.26N, 157o 59.32W)
     0330 s2c1 (WOCE deep)
     0900 s2c2 (WOCE shallow)
     1020 Plankton net tow
     1120 s2c3
     1130 s2c3 aborted (sensor problems)
     1200 s2c3
     1300 PRR-600/TSRB  cast
     1330 Plankton net tow
     1400 LADCP removed from rosette
     1420 s2c4
     1700 s2c5
     2000 s2c6
     2200 Plankton net tow
     2300 s2c7
     2310 s2c7 aborted (cable twist problems)
     2330 s2c7
     2340 s2c7 aborted (sensor spikes/bottle firing problems)
     2350 s2c7
     2400 s2c7 aborted (CTD errors)

     Wednesday,  18 March

     0010 CTD cable reterminated
     0020 Plankton net tow
     0040 Tow aborted
     0050 Plankton net tow
     0340 Go-Flo cast
     0550 Deployed primary productivity array (22o 44.96N, 157o 59.87W)
     0810 s2c8
     1000 Plankton net tow
     1100 s2c9
     1250 PRR-600/TSRB cast
     1400 s2c10
     1610 LADCP lowered to 225 m (DSE winch and starboard crane)
     1630 LADCP retrieved
     1710 s2c11
     1900 Retrieved primary productivity array (22o 53.0N, 158o 02.3W)
     2000 s2c12
     2110 Transit to pump tanks
     2300 s2c13 (IES site; 22o 49N, 158o 00W)

     Thursday, 19 March

     0050 LADCP deep cast (LADCP and pinger only on 'new' rosette, 
          winch cable lubricated)
     0530 LADCP 1000m cast
     0830 Floating sediment trap recovery (23o 10.4N, 158 08.2W)
     0920 Sediment trap recovery complete
     0930 Transit station 8
     1250 PRR-600/TSRB cast (coordinated with satellite pass)
     1330 Continued transit station 8
     1520 Zodiac operations (mooring inspection)
     1530 s8c1 (with 'new' rosette plus bottles)
     1630 Zodiac operations complete
     1650 Trace metal sampler deployed
     1730 Trace metal sampler recovered
     1810 E. Firing's LADCP tests
     1910 Science operations complete
     1920 Departed station 8

     Friday,  20 March
     
     0700 Arrived Snug Harbor
     1130 Completed offloading operations



Narrative:
---------

HOT 91 was conducted aboard the R/V Moana Wave 16-20 March 1998.
Captain Hayes was the master of the vessel and Dale Hebel chief
scientist.  There were a total of 19 participants in the scientific
party composed of 5 WOCE, 9 JGOFS, 3 Ancillary and 2 STAG. We departed
Snug on 16 March occupying stations at, Kahe Pt. (sta. 1), Station
ALOHA (sta. 2), and HALE ALOHA mooring location (sta. 8).   CTD
operations were conducted at stations 1, 2 & 8.  Fifteen CTD casts were
conducted at Station ALOHA and two at station 8 in addition to 4 light
casts, 6 net tows, 1 Go-Flo cast, and usual floating sediment traps and
productivity operations.  During the cruise the LADCP was fitted to the
rosette package and depending on the circumstances either used on the
new or old rosette.  LADCP tests were conducted on routine hydrocasts
as well as dedicated casts.  All underway measurement systems
(thermosalinograph, ADCP, meteorological instruments, pCO2 and
fluorometer) were operable and functioned normal. The seas were calm
with light winds and skies mostly clear.

Daily Activities (HST)
----------------------

13 March, 1998
Ship loading day. Mai Lopez was unable to get the necessary cable
supplies for the OPC before sailing so her position was reassigned to
Leslie Cotton an undergraduate working  with Bob Bidigare.

16 March, 1998
Departed Snug Harbor about 1 hr late due to a problem with the
autopilot.  After departure at about the mile buoy we had the routine
fire/abandon ship drill followed by a short science meeting.  Arrived
Kahe about 1300 hrs and conducted a 1000 m weight cast, PRR cast and
final 1000 m CTD cast.  Difficulties were encountered with the TSRB and
due to the late hr on the mainland we were unable to contact customer
service.  The lowered ADCP also experienced a problem which negated
data collection.  All underway systems appear to be funcitoned
properly.  Departed Kahe ~1700 hrs for Station ALOHA.  The weather was
mostly sunny with calm seas and light winds.

17 March, 1998
Arrived Station ALOHA sometime around midnight.  Conducted a net tow
followed by the deployment of the floating sediment traps.  No problems
were experienced with either activity.  Completed the first WOCE deep
cast (s2c1), followed by WOCE shallow (s2c2), 2 day & 2 night plankton
tows and one PRR- 600/TSRB cast.  Completed CTD casts through s2c6
however experienced problems on s2c3(sensors) and s2c7 (sensors and
bottle firing) causing aborted casts and delays. The lowered ADCP was
removed from the rosette for serious troubleshooting since the unit was
still not operating properly.  Fortunately, the TSRB began working
prior to the satellite overpass.  It appears appeared that the problem
may have something to do with heat.  I initialized the unit at about
0400 hrs and let it run for ~ 6hrs on deck.  When Terry tried to
restart it the problem reappeared.  It would not load the correct
calibration file causing erroneous outputs.  John Porter suggested that
it may have something to do with the heat so it was put in the lab
van.  After a period of time it again worked.  The seas remained calm
with winds at 10 kts from the NE and skies mostly clear.

18 March 1998
Removing the ADCP caused the cable to twist and after two casts the
cable needed to be reterminated.  It was decided that the old rosette
should be used for the remainder of the casts.  These activities put us
behind schedule by 2 casts.  The LADCP troubleshooting was successful
and later in the day the unit was deployed using the DSE winch and
starboard crane to 225 m. Afterward, it was mounted on the 'new'
rosette for further tests. We completed CTD casts through s2c13,
completed 1 day & 1 night plankton tow, Go-Flo cast, primary
productivity in situ incubation, and midday PRR/TSRB cast. The seas
were calm, winds light and skies mostly clear.

19 March 1998
The 225 m LADCP cast was successful and the final cast at Station ALOHA
was the LADCP deep cast. mounted on the 'new' rosette with the pinger
and the winch cable attached via a swivel.  At this point all samples
have been collected and all operations completed at Station ALOHA,
however, we did conduct another shallow (1000 m) LADCP cast while
enroute to the sediment traps and light cast (PRR/TSRB) enroute to
station 8. The sediment traps have drifted almost due north and the
calm sea conditions made for a good recovery.

At station 8 we deployed the zodiac to assess the damage to the buoy
antenna.  This group consisted of D. Hebel, E.  Firing and T.
Houlihan.  Sea conditions were very calm and following the inspection a
number of the scientific party had the opportunity to view and
photograph the ship from the zodiac perspective.  During the transit to
station 8 the SIO sampling bottles, CTD, pylon, etc., were again
transferred to the 'new' rosette.  It was this rosette that was used
for the 1000 m cast (s8c1) and subsequent rosette spin related tests.

20 March 1998
We departed station 8 at 1920 hrs arriving Snug Harbor 0700 hrs the
following morning.  Offloading was completed before noon.



Weather
-------

HOT 91:
The weather was mostly sunny with very calm 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 C (dry bulb) and clouds in tenths.

Day   Date    Wind          Sea          Swell     Barometer    Temp   Clouds

Mon*  16 Mar. 018-350,9-12  018-350,2    340, 3    30.03-30.09  75-79  2
Tues  17 Mar. 030-090,5-11  030-090,1-2  330,4-6   30.01-30.08  74-81  1-5
Wed   18 Mar. 060-100,7-10  060-100,2    320,4-6   30.00-30.08  74-80  1-7
Thur  19 Mar. light-100,0-6 light-100,1  320, 4-6  30.02-30.09  74-80  1-4
Fri** 20 Mar. light airs    light airs   320,4     30.02        71     4

* Only two entries (1800 & 2200 hrs)
**Only one entry  (0200 hrs)



Equipment and methods:
----------------------
With the exception of the winch cable and CTD sensors (same problem?)
all standard equipment functioned properly.  A lowered ADCP (LADCP) was
tested this cruise by E. Firing (UH) and Darryl Slocum (Sontek) with a
reasonable degree of success.  Rosette spin experiments were carried
out by E.  Firing.



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

Students:
---------

Others:
-------
Stuart Donachie                    Ectoenzyme activities/UH
Karin Bjorkman                     EOC experiments
Dale Hebel                         EOC measurements/UH
Markus Karner                      molecular probe samples