Sediment composition data from US JGOFS Sediment Traps in the Southern Ocean, 1996-1998 (U.S. JGOFS AESOPS project)

Website: https://www.bco-dmo.org/dataset/2721
Version: final
Version Date: 2002-10-01

Project
» U.S. JGOFS Antarctic Environment and Southern Ocean Process Study (AESOPS)

Program
» U.S. Joint Global Ocean Flux Study (U.S. JGOFS)
ContributorsAffiliationRole
Anderson, Robert F.Lamont-Doherty Earth Observatory (LDEO)Principal Investigator
Sayles, FrederickWoods Hole Oceanographic Institution (WHOI)Principal Investigator
Martin, WilliamWoods Hole Oceanographic Institution (WHOI)Co-Principal Investigator
Chandler, Cynthia L.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Dataset Description

Sediment composition


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Parameters

ParameterDescriptionUnits
event

event number from event log

sta

station number from event log

lat

latitude, minus value means South

decimal degrees
lon

longitude, minus value means West

decimal degrees
core_type

type of coring instrument used, where GC = gravity core where MC = multi core

depth_w

water depth

meters
depth_core

depth in core, mid-point of interval sampled

centimeters
depth_core_sd

depth in core, standard deviation

centimeters
CaCO3

calcium carbonate, weight percent

percent
Si_opal

opal, weight percent

percent
Si_opal_dup

opal, duplicate analysis, weight percent

percent
site

sediment trap mooring number

deploy_id

type of sampling device:
MC=MultiCorer WHIMP=Woods Hole Interstitial Marine Probe

porosity

volume of pore water per volume of wet
sediment

C_org

average weight percent of organic carbon

percent
C_org_sd

standard deviation of replicates

percent
biog_tot

Si_opal + CaCO3 + 2.8*C_org

percent
detrital

100 - biol_tot

percent
Pb210xs

excess Pb210 activity

dpm/gram
Pb210xs_sd

uncertainty in Pb210xs

dpm/gram
Th234xs

excess Th234 activity

dpm/gram
Th234xs_sd

uncertainty in Th234xs

dpm/gram


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Instruments

Dataset-specific Instrument Name
Gravity Corer
Generic Instrument Name
Gravity Corer
Generic Instrument Description
The gravity corer allows researchers to sample sediment layers at the bottom of lakes or oceans. The coring device is deployed from the ship and gravity carries it to the seafloor. (http://www.whoi.edu/instruments/viewInstrument.do?id=1079).

Dataset-specific Instrument Name
Multi Corer
Generic Instrument Name
Multi Corer
Generic Instrument Description
The Multi Corer is a benthic coring device used to collect multiple, simultaneous, undisturbed sediment/water samples from the seafloor. Multiple coring tubes with varying sampling capacity depending on tube dimensions are mounted in a frame designed to sample the deep ocean seafloor. For more information, see Barnett et al. (1984) in Oceanologica Acta, 7, pp. 399-408.


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Deployments

NBP-96-4

Website
Platform
RVIB Nathaniel B. Palmer
Report
Start Date
1996-08-30
End Date
1996-09-24
Description
Site Survey Cruise

Methods & Sampling
PI: Bob Anderson of: Lamont-Doherty Earth Observatory dataset: Sediment composition dates: September 07, 1996 to September 17, 1996 location: N: -56.9097 S: -63.8833 W: -170.1755 E: -169.2333 project/cruise: AESOPS/NBP96-4 ship: R/V Nathaniel B. Palmer Notes: CaCO3 measured by coulometry. Opal measured by alkaline leach and spectrophotometry. The concentrations reported are for biogenic opal, which includes 11% by weight water (SiO2*0.4H2O). Reference: Mortlock R.A., Froelich P.N., 1989. A simple method for the rapid determination of biogenic opal in pelagic marine sediments. Deep-Sea Research 36, 1415-1426.

NBP-98-2

Website
Platform
RVIB Nathaniel B. Palmer
Report
Start Date
1998-02-25
End Date
1998-04-03
Description
Benthic Process and Moorings Recovery

Methods & Sampling
PI: Fred Sayles and William Martin of: Woods Hole Oceanographic Institution data set: Sediment composition dates: February 26, 1998 to March 21, 1998 location: N: -56.8817 S: -76.4992 W: -178.107 E: -169.6252 project/cruise: AESOPS NBP98-2, Benthic Process and Mooring Recovery Cruise ship: R/V Nathaniel B. Palmer Sampling Methodology


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Project Information

U.S. JGOFS Antarctic Environment and Southern Ocean Process Study (AESOPS)


Coverage: Southern Ocean, Ross Sea


The U.S. Southern Ocean JGOFS program, called Antarctic Environment and Southern Ocean Process Study (AESOPS), began in August 1996 and continued through March 1998. The U.S. JGOFS AESOPS program focused on two regions in the Southern Ocean: an east/west section of the Ross-Sea continental shelf along 76.5°S, and a second north/south section of the Southern Ocean spanning the Antarctic Circumpolar Current (ACC) at ~170°W (identified as the Polar Front). The science program, coordinated by Antarctic Support Associates (ASA), comprised eleven cruises using the R.V.I.B Nathaniel B. Palmer and R/V Roger Revelle as observational platforms and for deployment and recovery of instrumented moorings and sediment-trap arrays. The Ross-Sea region was occupied on six occasions and the Polar Front five times. Mapping data were obtained from SeaSoar, ADCP, and bathymetric systems. Satellite coverage was provided by the NASA SeaWiFS and the NOAA/NASA Pathfinder programs.



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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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