Equatorial Pacific Process Study Cruise Descriptions

During 1992 the R/V Thomas G. Thompson conducted five cruises in support of the U.S. EqPac process study. These cruises consisted of two repeat meridional sections (12°N - 12°S), 2 equatorial surveys, and a benthic survey (all at 140° W). The scientific objectives of this study were to observe the processes in the Equatorial Pacific controlling the fluxes of carbon and related elements between the atmosphere, euphotic zone, and deep ocean. As luck would have it, the survey window coincided with an El Nino event. A bonus for the research team.

The U.S. JGOFS Data Management Office (DMO) has compiled a bottle data product from the first four cruises and CTD data from all five cruises listed in the table below.


Equatorial Pacific Process Study Cruises

Cruise ID Cruise Name Stations Time Location Chief Scientist
  TT007 Spring Survey 15 locations January 30 - March 13, 1992
12°N-12°S at 140°W
J. Murray
  TT008 Spring Time Series 8 locations March 19 - April 15, 1992
Equator, 140°W
M. Roman
  TT011 Fall Survey 15 locations August 5 - September 18, 1992
12°N-12°S at 140°W
R. Barber
  TT012 Fall Time Series 5 locations September 24 - October 21, 1992
Equator, 140°W
M. Bacon
  TT013 Benthic Survey 18 locations October 30 - December 13, 1992
12°N-12°S at 140°W
M. Leinen


U.S. JGOFS Cruise List

Process cruises:
R/V Thomas G. Thompson 7 (TT007)
Dates: January 30 - March 13, 1992 (2/3 - 3/9)
Chief Scientist: J. Murray
Purpose: Spring Survey Cruise; 12°N-12°S at 140°W
R/V Thomas G. Thompson 8 (TT008)
Dates: March 19 - April 15, 1992 (3/17 - 4/20)
Chief Scientist: M. Roman
Purpose: Spring Time Series; Equator, 140°W
R/V Thomas G. Thompson 11 (TT011)
Dates: August 5 - September 18, 1992
Chief Scientist: R. Barber
Purpose: Fall Survey; 12°N-12°S at 140°W
R/V Thomas G. Thompson 12 (TT012)
Dates: September 24 - October 21, 1992 (9/24 - 10/25)
Chief Scientist: M. Bacon
Purpose: Fall Time Series; Equator, 140°W
R/V Thomas G. Thompson 13 (TT013)
Dates: October 30 - December 13, 1992
Chief Scientist: M. Leinen
Purpose: Benthic Survey

Sediment trap deployment and recovery cruises:
R/V Wecoma W9201B
Dates: January 12 - February 8, 1992
Chief Scientist: S. Honjo, J. Dymond, R. Collier
Purpose: 140°W sediment trap deployment
R/V Thomas G. Thompson 15 (TT015)
Dates: January 17 - January 28, 1993
Chief Scientist: R. Collier
Purpose: 140°W sediment trap recovery

NOAA boreal spring and fall section cruises east and west of 140°W:
R/V Baldridge (MB-92-02 legs 1,2,3)
Dates: March-May 1992
Chief Scientist: (1: L. Mangum, 2: D. Atwood, 3: R. Feely)
Location: 10°N-10°S at 110°W, 125°W, 140°W, 170°W
R/V Discoverer (DI-92-03 legs 3,4,5)
Dates: September-November 1992
Chief Scientist: (3: R. Feely, 4: R. Wanninkhof, 5: P. Murphy)
Location: 10°N-10°S at 95°W,110°W, 125°W, 140°W, 170°W


Research Vessel Information

R/V Malcolm Baldridge decommissioned on August 23, 1996

R/V Discoverer decommissioned on August 16, 1996

R/V Thomas G. Thompson

R/V Wecoma