HOT-28: Chief Scientist Report

Chief Scientist: C. WINN

Personnel List

Chris Winn, Chief Scientist
Ricardo Letelier
Terrence Houlihan
Jef Snyder
Sean Kennan
Toshiaki Shinoda
Chris Carrillo
Dan Sadler
Fernado Santiago-Mandujano
Sarah Hall
Robert Andersen
Betsy Tsai


Cruise Schedule

We departed Snug Harbor at 10:30 on the 8th of July after a 1.5 hour
delay for barge traffic.  Other than the delayed departure, the cruise
schedule did not deviate significantly from plan.  We returned to Snug
Harbor at 16:00 on July the 12th.

Sampling

All WOCE and GOFS hydrographic and chemical sampling was completed on
HOT-28.  The GOFS primary production and sediment trap experiment were
also successful.  However, the WOCE 36 burst sampling was interrupted
after approximately 30 hours because of the failure of the Markey
winch.

CTD Operations

The Markey winch failed with approximately 1000 m of wire out.  As a
result, about 1000 m of was cut from the hydrowire.   We attempted to
recover the CTD using wire clamps and the ship's crane before cutting
the wire.  This attempt was abandoned when the wire clamp, which was
not designed specifically for our wire, broke strands in the
hydrowire.  After the hydrowire was cut, the package was recovered by
spooling on the Alpha Helix winch.  Following an 8 to 10 hour delay to
reconfigure the system, CTD operations were resumed using the Alpha
Helix wire and winch.  The 1000 m piece of cut wire was discarded at
approximately 22 45.22'N, 158 01.54'W.

Sediment trap and Primary production Work

The sediment trap and primary production work went smoothly on this
cruise.  The Alpha Helix crew was again primarily responsible for
recovering and deploying the sediment trap gear.  Although the recovery
of the large spar buoy continues to be a problem on the Helix, the seas
were relatively calm on this cruise, and the deployment and recovery of
the spar was accomplished without major problems.