HOT-18: Chief Scientist Report

Chief Scientist: D. KARL

HOT-18 Cruise Report
R/V Wecoma
11-15 June 1990 



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

Dave Karl		CS
Anne Dettlebach		UH-REU
John Dore		UH
Dale Hebel		UH
Ricardo Letelier	UH
Erica Nelson		UH-REU
David Rose		UH-REU
Marc Rosen		UH
Michael Sawyer		UH-REU
Jef Snyder		UH
Chuck Stump		UW
Toshiaki Shinoda	UH



Cruise Schedule:
----------------

8 June - move GOFS van from MSB to Snug Harbor along with as much other
gear/supplies as possible (for week-end storage at Snug Harbor)

11 June (0730) - assemble at Snug Harbor at 0730; begin loading the
ship (Marc Rosen will co-ordinate the on-loading of all of the heavy
gear; i.e., items requiring the use of the crane)

NOTE: It is imperative that everyone involved in this cruise be at the
dock and available to help with the cruise preparation. June 11 is Kam
Day and will be a holiday for the Snug Harbor employees. Everything
must be loaded, secured and ready to sail by 1130.

11 June (1200) - ETD Snug Harbor

11 June (1530) - ETA, Station Kahe; begin weight test cast and continue
with CTD and water sampling ops (all hands)

11 JUne (1730) - ETD, Station Kahe

12 June (0530) - ETA, Station ALOHA 
During the next 72 hrs:  
1.	deploy sediment traps 
2.      conduct 4800 m CTD cast 
3.      begin 36-hr CTD and PNF casts 
4.      conduct 24-hr in situ primary production experiment 
5.      conduct net tows and ancillary experiments 
6.      locate and recover sediment traps; depart Station ALOHA

NOTE: We are currently planning to be back in Honolulu by noon on
Friday (15 June). We plan to offload all HOT equipment at that time.



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

HOT-18 departed Snug Harbor at 12:00 on 11 June 1990 aboard the R/V
Wecoma. Kahe Point was visited en route to Station ALOHA, and HOT-18
returned to Snug Harbor at 0800 on 14 June. As on HOT-16, the Kahe
Point Station was moved approximately 9 km north of the usual
location.


WOCE & JGOFS Sampling

All WOCE and JGOFS sampling was completed on HOT-18.


CTD and XBT Operations

There were no CTD problems on this cruise. XBTs were dropped en route
to Station ALOHA.


Primary Production and Sediment Trap Measurements

Primary production was measured in situ for 12 hours. Sediment trap
measurements were made as usual with no significant problems.


Optical Measurements

Optical casts were completed at Kahe Point.


Ancillary projects

Samples were collected for Charles Keeling of Scripps and for Steve
Emerson and Paul Quay of the University of Washington.