HOT-39: Chief Scientist Report
Chief Scientist: C. WINN
HOT-39 Cruise Report
R/V Moana Wave
August 3 - 8, 1992
Report Summary:
The schedule was unique on this cruise. We loaded the morning of the
3rd and departed that afternoon. All of the standard WOCE and GOFS
work was completed, and we visited station three for the oxygen sensor
deep cast. However, due to a problem with the CTD wire block, we were
unable to complete the planned CTD section from ALOHA to Kaena Point.
Cruise Report
We loaded the ship on the morning of the 3rd, and we departed snug
Harbor at 17:00. The pylon was changed enroute to Kahe Point because
the one mounted in the rosette was firing incorrectly. We arrived at
Kahe Point at 20:00. A test cast was done. Prior to the standard CTD
cast several errors observed while the CTD was on deck forced us to
check the connections before deploying the CTD. This caused some delay
in our work at Kahe Point, and did not completely eliminate this
problem. We departed Kahe at approximately 00:30.
ADCP turned on when we left Snug and was left on for the duration of
the cruise. Bottom tracking was turned on during both transits along
the Waianae Coast.
The traps were deployed upon arrival at Aloha at approximately 10:00.
The CTD cable was re-terminated during the sediment trap deployment.
The 36 hour burst CTD sampling was initiated at approximately 12:00.
The first cast to 1000 decibars was compromised by valves left open on
the sampling bottles and an unusually high number of errors continued
to be observed in the CTD traces. The standard GOFS sampling which is
conducted at night and was planned for the evening of the 4th had to be
postponed because of a broken air conditioner in the wet and dry lab
spaces. These spaces rapidly became much too hot to conduct our
standard chemical analyses, and these casts were postponed until the
night of the 5th. The GOFS Go-Flo cast was completed on schedule early
on the 5th without problems. The WOCE deep and shallow casts were done
starting about 0900 on the morning of the 5th. The remained of our
standard sampling was completed on schedule. The hydrocast at station
three and the sediment trap recovery were also completed without
incident.
The transmissometer which we have been in routine use on the HOT
program was compared to a new instrument supplied by Sea Tech. The HOT
program transmissometer continued to display anomalous behavior at
depths greater than 400 m whereas the new instrument did not.
There were several unusual problems with the CTD/rosette on this
cruise. Three sampling bottles were lost during cast 7. From debris
left on the top some bottles it appears that the rosette collided with
the ship hull. However, this collision was not observed during
deployment or recovery by either the science party or the winch
operator who now stands directly above the A-frame on the Moana Wave.
In addition, a problem developed with the pylon on positions 3. The
use of that position was discontinued for the remainder of the cruise.
Following the recovery of the sediment trap array, the first of CTD
transect casts was begun. During deployment the CTD cable broken when
the cable was caught in the block. Following re-termination the CTD
cable was again caught in the block when slack in the cable was being
removed. The block was removed from the A-frame and one of the cheeks
was found to be bent. The ship's engineers attempted to repair the
block. However, it was not possible to repair the block completely, and
CTD operations were suspended. We then attempted to collect an XBT
transect along 158 degrees West to Kahuku Point. However, the XBT's
were not working properly and transect was abandoned. We Arrived at
Snug Harbor at 07:30 on the 8th.
HOT-39 Personnel
Chris Winn Chief Scientist
Rich Muller UH Technician
Christopher Carrillo UH Technician
Ricardo Letelier UH Student
Hongbin Liu UH Student
Jim Christain UH Student
Elaine Kotler UH Student
Sophia Asghar UH Student
Dan Sadler UH Student
Sean Kennan UH Student
Reka Domokos UH Student
Yimei Zhou UH Student
David Wilbur UW Technician
Jennifer Wilcox undergraduate Student
Iternary (local Times)
8/3/92 1700 Depart Snug Harbor
2000 Arrive Kahe Point
8/4/92 1000 Deploy sediment traps
1200 begin 36 hour CTD burst sampling
8/5/92 0200 GoFlo Cast
0500 Deploy primary production array
0900 WOCE deep cast
1800 recover primary production array
8/6/92 1700 end 36 hour burst sampling begin transit to
station 3
2100 station 3 deep cast
8/7/92 0100 end station 3 cast begin transit to sediment
traps
0600 CTD cable broken in block
0900 recover sediment traps
1230 begin transit to Snug
8/8/92 0730 arrive at Snug Harbor
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