HOT-33: Chief Scientist Report

Chief Scientist: C. WINN

HOT-33 Cruise Report
R/V Wecoma
Jan 3-8, 1992


Personnel list:

	Chris Winn - Chief Scientist
	Elaine Kotler
	Terrence Houlihan
	Jim Christian
	Louis Tupas
	Chris Carrillo
	Ariel Anbar
	Reka Domokas
	Jef Snyder
	Sean Kennan
	Marc Rosen
	Peter Hacker
	Kristin Leckrone


Itinerary (local time):

Friday, Jan. 3
	1000	Left Snug Harbor
	1300	Arrive Kahe Pt.
 
Saturday, Jan. 4
	0400	Arrive Station ALOHA
		Deploy sediment traps 
		commence CTD operations

Sunday, Jan. 6
	0500	Deploy 1o Production array
	1800	Recover 1o Production array
	2200	Completed 36hr burst 
		sampling and commenced
		Lowered ADCP sampling

Tuesday, Jan 7
	0300	Recovered traps 
		commenced transect
	2300	Transit to Snug Harbor


Cruise Brief:

We departed Snug Harbor at 1000 and arrived at the Kahe point station
at approximately 1300.  Some CTD start up problems were encountered at
Kahe Point due to the new marine connectors which  were used on HOT-33,
and which were apparently not seated properly.  These connection
problems resulted in two casts being made at Kahe point.  CTD data was
obtained on the second cast at Kahe point, however, transmissometer
data was not obtained.

The sediment traps were deployed on the southeast edge of station
ALOHA.  CTD operations were begun after arriving at the center of the
station.  The unseasonably calm weather which persisted throughout
HOT-33 made for smooth CTD operations during this cruise and no major
CTD problems were encountered on this cruise.  However, the
transmissometer cable was damaged early in the cruise and no
transmisometer data was obtained on HOT-33.  The transmissometer cable
needs to be repaired before HOT-34.  CTD deployment and recovery was
not a problem on this cruise.  This was, in part, due to the calm
weather and, in part, due to the improved deployment strategy used on
HOT-33 (see below).   The tarp for covering the CTD was not set up on
HOT-33. Although the tarp was not needed on this cruise, it should be
set up on HOT-34.

The Primary production measurements were successfully completed.
However, neither of the strobe lights on the in situ array spare buoy
functioned properly on this cruise.  These need to be repaired or
replaced before HOT-34.

Following the WOCE burst sampling the 24 place rosette was replaced by
the 12 place rosette for lowered ADCP profiling.  Five lowered ADCP
casts were made to 2000 m at station ALOHA and 4 XCP's were deployed on
this cruise to span 1.5 intertial periods.  Two XCP's were deployed
during WOCE burst sampling and two were deployed during lowered ADCP
casts.  In addition, a shipboard ADCP calibration survey was
conducted.

The sediment traps were recovered without incident, and CTD casts were
obtained to 1000m at stations 4 and 5.  A CTD cast to 100m above the
bottom was made of station 6.  Water samples were collected for
salinity, chlorophyll a and nutrients at all three transect stations.
In addition, oxygen samples were collected at each transect station for
the calibration of the oxygen sensor.  XBT's were dropped at regular
intervals on the transect from station 3 to station 5.

As on HOT-32, the ship proceeded along the 300m isobath from station 5
to Kaena Point for ADCP calibration.  The ship moved offshore to pump
bilges in transit from Kaena Point to Honolulu Harbor and arrived at
Snug Harbor at approximately 0700 on Wednesday the 8th.


CTD Operations:

A new CTD recovery and deployment strategy was used on HOT-33.  The
headache ball was removed for operations by disconnecting the hydrowire
from the CTD and feeding it through the block.  The crane was then
swung forward on the 0-1 deck to remove or replace the headache ball.
CTD recoveries were accomplished by bringing the CTD to the surface and
using a happy hooker to tag the hoop around the center of the rosette
while most of the CTD remained beneath the sea surface.  This tag line
was used to stabilize the CTD when it was raised out of the water.
When the package was removed from the water, two large aluminum hooks,
which Brian Wendler constructed for this purpose, were used to quickly
tag the hoops at the base of the rosette.  The tag around the hoop was
then released and the package was brought aboard using the tag lines
attached to the hoops at the base of the rosette.



Ancillary Programs:

Dave Keeling	 	CO2
Paul Quay 		delta 14C
Lisa Cambell  		phytoplankton taxonomy
Ariel Anbar 		trace metals


Student Samples:

Jim Christian