Preliminary abundance and carbon biomass of phytoplankton from cruises TT007, TT008, TT012 in the Equatorial Pacific in 1992 during the U.S. JGOFS Equatorial Pacific (EqPac) project

Website: https://www.bco-dmo.org/dataset/2633
Version: final
Version Date: 1997-06-15

Project
» U.S. JGOFS Equatorial Pacific (EqPac)

Program
» U.S. Joint Global Ocean Flux Study (U.S. JGOFS)
ContributorsAffiliationRole
Fryxell, GretaTexas A&M University (TAMU)Principal Investigator
Chandler, Cynthia L.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Dataset Description

Preliminary abundance and carbon biomass of phytoplankton


Methods & Sampling

See Platform deployments for cruise specific documentation


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Parameters

ParameterDescriptionUnits
stastation number from event log
castctd cast number from event log
eventevent/operation number from event log
lat_nnominal latitude whole degrees
lon_nnominal longitude whole degrees
yrdayday of year 1992 day
botCTD rosette bottle number
depth_nnominal sample depth meters
dinodinoflagellate abundance in size fraction greater than 15 micrometers cells/liter
diatom_deadabundance of dead diatom tests in size fraction greater than 15 micrometers cells/liter
diatomabundance of live diatoms in size fraction greater than 15 micrometers cells/liter
cocccoccolithophore abundance in size fraction greater than 15 micrometers cells/liter
phyto_othabundance of other phytoplankton in size fraction greater than 15 micrometers cells/liter
phyto_totaltotal count of all phytoplankton cells in size fraction greater than 15 micrometers cells/liter
dino_Ccarbon biomass of dinoflagellates in size fraction greater than 15 micrometers picograms carbon/liter
diatom_Ccarbon biomass of diatoms in size fraction greater than 15 micrometers picograms carbon/liter
cocc_Ccarbon biomass of coccolithophores in size fraction greater than 15 micrometers picograms carbon/liter
phyto_oth_Ccarbon biomass of other phytoplankton in size fraction greater than 15 micrometers picograms carbon/liter
phyto_total_Ctotal carbon biomass of all phytoplankton cells in size fraction greater than 15 micrometers picograms carbon/liter

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Deployments

TT007

Website
Platform
R/V Thomas G. Thompson
Start Date
1992-01-30
End Date
1992-03-13
Description
Purpose: Spring Survey Cruise; 12°N-12°S at 140°W TT007 was one of five cruises conducted in 1992 in support of the U.S. Equatorial Pacific (EqPac) Process Study. The five EqPac cruises aboard R/V Thomas G. Thompson included 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.

Methods & Sampling
PI: Greta Fryxell of: Texas A&M University dataset: Preliminary abundance and carbon biomass of phytoplankton dates: February 06, 1992 to March 09, 1992 location: N: 12.0674 S: -12.0902 W: -140.7452 E: -134.5151 project/cruise: EqPac/TT007 - Spring Survey ship: Thomas Thompson

TT008

Website
Platform
R/V Thomas G. Thompson
Start Date
1992-03-19
End Date
1992-04-15
Description
Purpose: Spring Time Series; Equator, 140°W TT008 was one of five cruises conducted in 1992 in support of the U.S. Equatorial Pacific (EqPac) Process Study. The five EqPac cruises aboard R/V Thomas G. Thompson included 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.

Methods & Sampling
PI: Greta Fryxell of: Texas A&M University dataset: Abundance and carbon biomass of phytoplankton dates: March 25, 1992 to April 06, 1992 location: N: 0.015 S: -0.016 W: -140.048 E: -139.955 project/cruise: EqPac/TT008 - Spring Time Series ship: Thomas Thompson

TT012

Website
Platform
R/V Thomas G. Thompson
Start Date
1992-09-24
End Date
1992-10-21
Description
Purpose: Fall Time Series; Equator, 140°W TT012 was one of five cruises conducted in 1992 in support of the U.S. Equatorial Pacific (EqPac) Process Study. The five EqPac cruises aboard R/V Thomas G. Thompson included 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.

Methods & Sampling
PI: Greta Fryxell of: Texas A&M University dataset: Abundance and carbon biomass of phytoplankton dates: October 03, 1992 to October 21, 1992 location: N: 0.0033 S: -0.0085 W: -140.0138 E: -139.9895 project/cruise: EqPac/TT012 - Fall Time Series ship: Thomas Thompson


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Project Information

U.S. JGOFS Equatorial Pacific (EqPac)


Coverage: Equatorial Pacific


The U.S. EqPac process study consisted of repeat meridional sections (12°N -12°S) across the equator in the central and eastern equatorial Pacific from 95°W to 170°W during 1992. The major scientific program was focused at 140° W consisting of two meridional surveys, two equatorial surveys, and a benthic survey aboard the R/V Thomas Thompson. Long-term deployments of current meter and sediment trap arrays augmented the survey cruises. NOAA conducted boreal spring and fall sections east and west of 140°W from the R/V Baldridge and R/V Discoverer. Meteorological and sea surface observations were obtained from NOAA's in place TOGA-TAO buoy network.

The scientific objectives of this study were to determine the fluxes of carbon and related elements, and the processes controlling these fluxes between the Equatorial Pacific euphotic zone and the atmosphere and deep ocean. A broad overview of the program at the 140°W site is given by Murray et al. (Oceanography, 5: 134-142, 1992). A full description of the Equatorial Pacific Process Study, including the international context and the scientific results, appears in a series of Deep-Sea Research Part II special volumes:

Topical Studies in Oceanography, A U.S. JGOFS Process Study in the Equatorial Pacific (1995), Deep-Sea Research Part II, Volume 42, No. 2/3.

Topical Studies in Oceanography, A U.S. JGOFS Process Study in the Equatorial Pacific. Part 2 (1996), Deep-Sea Research Part II, Volume 43, No. 4/6.

Topical Studies in Oceanography, A U.S. JGOFS Process Study in the Equatorial Pacific (1997), Deep-Sea Research Part II, Volume 44, No. 9/10.

Topical Studies in Oceanography, The Equatorial Pacific JGOFS Synthesis (2002), Deep-Sea Research Part II, Volume 49, Nos. 13/14.



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Program Information

U.S. Joint Global Ocean Flux Study (U.S. JGOFS)


Coverage: Global


The United States Joint Global Ocean Flux Study was a national component of international JGOFS and an integral part of global climate change research.

The U.S. launched the Joint Global Ocean Flux Study (JGOFS) in the late 1980s to study the ocean carbon cycle. An ambitious goal was set to understand the controls on the concentrations and fluxes of carbon and associated nutrients in the ocean. A new field of ocean biogeochemistry emerged with an emphasis on quality measurements of carbon system parameters and interdisciplinary field studies of the biological, chemical and physical process which control the ocean carbon cycle. As we studied ocean biogeochemistry, we learned that our simple views of carbon uptake and transport were severely limited, and a new "wave" of ocean science was born. U.S. JGOFS has been supported primarily by the U.S. National Science Foundation in collaboration with the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Energy and the Office of Naval Research. U.S. JGOFS, ended in 2005 with the conclusion of the Synthesis and Modeling Project (SMP).



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