HOT-15: Chief Scientist Report

Chief Scientist: C. WINN

HOT-15 Cruise Report
SSP Kaimalino
17-21 Mar. 1990 



Personnel List:
---------------

Chris Winn		CS
Ricardo Letelier	GOFS
Dale Hebel		GOFS
John Dore		GOFS
Kare Selph		GOFS
Steve Chiswell		WOCE
Stewart Reid		WOCE
Max Cremer		WOCE
Jef Snyder		WOCE
Marc Rosen		GOFS/WOCE
David Wilbur		U.W. Oxygen



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

13 Mar.
  0430 Depart Snug Harbor
  0800 Arrive Kahe Pt
  1100 Depart Kahe Pt
14 Mar.
  0000 Arrive HOT-site: deploy sediment traps
  0200 Commence water sampling (Primary productivity cast)
  0600 deploy in situ array
  0700 WOCE deep casts 4500m
  1000 WOCE cast 2500m
       including: on days 1, 2 and 3
  1800 recover in situ array
  0200 Primary productivity cast
  0600 Deploy in situ primary production array
  1800 recover in situ array
  2000 Locate traps
17 Mar.
  0000 recover traps
  0200 depart for Snug Harbor
  2000 Arrive Snug Harbor



Narrative:
----------

This cruise left Snug Harbor on the SSP Kaimalino at 0800 on 14 March
1990. Samples were collected at Kahe Point, but rough seas encountered
upon rounding the northeast end of Oahu forced the ship to return to
Snug Harbor to wait for calmer weather.

A second leg left Snug Harbor on 18 March 1990 after local weather
conditions became more favorable. Rough seas were not a problem on this
second trip, and the Kahe Point station was not revisited on this leg.
HOT-15 returned to Snug Harbor on 21 March 1990.


WOCE & JGOFS Sampling

All sampling was completed on HOT-15.


CTD and XBT Operations

The CTD cable needed to be reterminated once during this cruise. This
required about 5 hours of station time and produced a gap of about 6
hours in the WOCE CTD burst sampling. Oxygen sensor problems prevented
the collection of continuous oxygen profiles on this cruise. NO XBTs
were deployed on this cruise.


Primary Production and Sediment Trap Measurements

In addition to the standard 12-hour in situ measurement of primary
production using Go-Flo bottles, in situ primary production was also
measured on water samples collected with the PVC bottles mounted on the
rosette system. Comparisons of primary production estimates taken from
rosette sampling and Go-Flo bottles were obtained on three separate
12-hour in situ incubation experiments. No 24-hour or on-deck
incubations were conducted on this cruise.


Optical Measurements

Optical casts were completed at Kahe Point.


Ancillary projects

Samples for dissolved gases were obtained for Charles Keeling of
Scripps and for Steve Emerson and Paul Quay of the University of
Washington. Samples for dissolved DNA were collected by Karen Selph
(U.  Hawaii).