Dataset: rad_sed_trap
Deployment: EqPac-Array

Radionuclides, moored sediment trap samples

Principal Investigator:

Robert F. Anderson (Lamont-Doherty Earth Observatory, LDEO)

BCO-DMO Data Manager:

Cynthia L. Chandler (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. JGOFS Equatorial Pacific (EqPac)

Version:

April 22, 2002

Deployment Synonyms:

W9201B, EqPac-1, sediment trap

Version Date:

2002-04-22

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/450790/data

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Description

Radionuclides, moored sediment trap samples

Methods & Sampling

Dataset acquisition description

   PI:              Bob Anderson
   of:              Lamont-Doherty Earth Observatory
   dataset:         Radionuclides, moored sediment trap samples

Data Processing Description

Dataset Processing Description

Deployment-specific processing description

January 8, 2002
Bob Anderson
Lamont-Doherty Earth Observatory

It was necessary to composite individual time-series sediment trap samples
to obtain sufficient material for radionuclide analysis. In the
spreadsheet we indicate the cup numbers, as presented by Honjo et al.,
1995, used to prepare each composite sample. The EqPac sediment trap
samples were analyzed by isotope dilution alpha spectrometry for the U- and
Th-series. The Th-232 content of the trap samples was so low that we were
unable to resolve the Th-232 peak above the tail of the Th-230 peak, so no
Th-232 data are reported. Be-10 was measured by accelerator mass
spectrometry.

The reference that best described the methods followed for measuring Th, Pa
and 10Be in sediment trap samples is:

Y. Lao, R.F. Anderson, W.S. Broecker, H.J. Hofmann and W. Wolfli,
Particulate fluxes of 230Th, 231Pa, and 10Be in the Northeastern Pacific
Ocean, Geochimica Cosmochimica Acta 57(1), 205-217, 1993.

The reference that best described the method followed for measuring Pb-210
in sediment trap samples is:

Anderson, R. F., S. L. Schiff and R. H. Hesslein (1987). Determining
sediment accumulation and mixing rates using 210Pb, 137Cs, and other
tracers: problems due to post depositional mobility or coring artifacts.
Can. J. Fish. Aquat. Sci., Vol. 44, Supplement No. 1: 231-250.

More information about this dataset deployment

Instruments

Accelerator Mass Spectrometer

Supplied Description:

Instrument Type

Generic Name: Accelerator Mass Spectrometer

Acronym: AMS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB17/

Generic Description:

An AMS measures "long-lived radionuclides that occur naturally in our environment. AMS uses a particle accelerator in conjunction with ion sources, large magnets, and detectors to separate out interferences and count single atoms in the presence of 1x1015 (a thousand million million) stable atoms, measuring the mass-to-charge ratio of the products of sample molecule disassociation, atom ionization and ion acceleration." AMS permits ultra low-level measurement of compound concentrations and isotope ratios that traditional alpha-spectrometry cannot provide. More from Purdue University: http://www.physics.purdue.edu/primelab/introduction/ams.html

Sediment Trap

Supplied Description:

Instrument Type

Generic Name: Sediment Trap

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/33/

Generic Description:

Sediment traps are specially designed containers deployed in the water column for periods of time to collect particles from the water column falling toward the sea floor. In general a sediment trap has a jar at the bottom to collect the sample and a broad funnel-shaped opening at the top with baffles to keep out very large objects and help prevent the funnel from clogging. This designation is used when the specific type of sediment trap was not specified by the contributing investigator.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
sta_name	station name		no_bcodmo_term
lat_n	latitude, nominal, minus means South	degrees	no_bcodmo_term
lon_n	longitude, nominal, minus means West	degrees	no_bcodmo_term
depth_trap	depth of sediment trap	meters	no_bcodmo_term
cup	cup number(s) from which sample was collected		no_bcodmo_term
date_begin	date sampling begins, as YYYYMMDD		no_bcodmo_term
date_end	date sampling ends, as YYYYMMDD		no_bcodmo_term
Pb210_part_lt1mm	lead-210, particulate < 1mm	dpm/gram	no_bcodmo_term
Pb210_err	lead-210 error, plus/minus 1 sigma	dpm/gram	no_bcodmo_term
Th230_part_lt1mm	thorium-230, particulate < 1mm	dpm/gram	no_bcodmo_term
Th230_err	thorium-230 error, plus/minus 1 sigma	dpm/gram	no_bcodmo_term
Pa231_part_lt1mm	protactinium-231 particulate < 1mm	dpm/gram	no_bcodmo_term
Pa231_err	protactinium-231 error, plus/minus 1 sigma	dpm/gram	no_bcodmo_term
Be10_part_lt1mm	beryllium-10, particulate < 1mm	atoms/gram	no_bcodmo_term
Be10_err	beryllium-10 error, plus/minus 1 sigma	atoms/gram	no_bcodmo_term

Database

Contribute Data

Dataset: rad_sed_trap
Deployment: EqPac-Array

Dataset acquisition description

Dataset Processing Description

Deployment-specific processing description

Database

Contribute Data

Dataset: rad_sed_trapDeployment: EqPac-Array

Dataset acquisition description

Dataset Processing Description

Deployment-specific processing description

Dataset: rad_sed_trap
Deployment: EqPac-Array