Dataset: Th234_activity
Deployment: AII-119-5

Thorium 234 activity in particulate and dissolved phases

Principal Investigator:

Kenneth O. Buesseler (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

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

Project:

U.S. JGOFS North Atlantic Bloom Experiment (NABE)

Version:

November 07, 2002

Version Date:

2002-11-07

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/450727/data

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Description

Thorium 234 activity in particulate and dissolved phases

Methods & Sampling

Dataset acquisition description

   PI:              Ken Buesseler
   of:              Woods Hole Oceanographic Institution
   dataset:         Thorium 234 activity in particulate and dissolved phases
   dates:           April 19, 1989 to June 5, 1989
   location:        N: 46.8317  S: 46.24  W: -18.3717  E: -17.68
   project/cruise:  North Atlantic Bloom Experiment/Atlantis II 119, leg 4 and 5
   ship:            R/V Atlantis II

Methodology:

Comments:
Data collected via in-situ pumping and gamma counting techniques referenced in:

Livingston, H.D. and J.K. Cochran (1987) Determination of transuranic and
thorium isotopes in ocean water in solution and in filterable particles.
J. Radioanal. Nucl. Chem., vol. 115 (2), 299-308.

Buesseler, K.O., M.P. Bacon, J.K. Cochran and H.D. Livingston (1990)
Shipboard measurement of Th-234 during the JGOFS Spring Bloom Experiment.
EOS, vol. 71 (2), 139.

All data decay corrected to mid-point of sampling time
Contacts: Ken O. Buesseler, Michael P. Bacon, Hugh D. Livingston (WHOI)
and J. Kirk Cochran (SUNY)

Data:
Thorium-234 activities reported as Dpm/l (disintegration per minute per liter)
Data for dissolved and particulate (0.5 micron nominal pore size) 234-Th
reported with a one sigma error. This error is propagated from errors
due to counting statistics, standardization and in-situ pump collection
efficiency.

A data quality code is assigned to each measurement.
a = Highest confidence level (ie. lowest error);
c = Poorest confidence level

This quality code is determined by a combination of sampling
and analytical factors, and is included in the reported error
estimate.

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown NABE NSF	National Science Foundation

Instruments

Slurper Pump

Supplied Name: Ken Buesseler's Slurper pump

Supplied Description:

Ken Buesseler's Slurper pump

Instrument Type

Generic Name: Slurper Pump

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/30/

Generic Description:

The 'Slurper' is a custom designed in situ pumping system that pumps seawater in a way that allows large-volume sampling of pre-determined depth intervals. The 'Slurper' was used during US JGOFS cruises to acquire samples for 234-Thorium and POC/PON analysis (Buesseler et al., 1988). The 'Slurper' sampling system comprised a positive displacement pump coupled to a DC motor. Pump speed and sample volume were controlled via shipboard laptop computer.

References:

Buesseler, K. O., L. Ball, J. Andrews, C. Benitez-Nelson, R. Belastock, F. Chai and Y.Chao. 1998. Upper Ocean Export of Particulate Organic Carbon in the Arabian Sea derived from Thorium-234. Deep-Sea Res. II, Arabian Sea Volume, Vol. 45, No. 10-11, 2461-2488.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
year	year reported as YYYY		year
sta	station number from event log	dimensionless	no_bcodmo_term
cast	cast number, numbered consectively within station, from event log	dimensionless	cast
event	event number from event log	dimensionless	event
depth	sample depth	meters	depth
Th234_d_lt0.5	thorium 234 activity in dissolved phase, less then 0.5 microns	Dpm/l	no_bcodmo_term
Th234_d_lt0.5_err	estimated error, thorium 234 activity in dissolved phase, one sigma	Dpm/l	no_bcodmo_term
Q_code	originator assigned quality code Highest confidence level = a (ie. lowest error) Poorest confidence level = c This quality code is determined by a combination of sampling and analytical factors, and is included in the reported error estimate.		q_code
Th234_p_gt0.5	thorium 234 activity in particulate phase, greater then 0.5 microns	Dpm/l	no_bcodmo_term
Th234_p_gt0.5_err	estimated error, thorium 234 activity in particulate phase, one sigma	Dpm/l	no_bcodmo_term

Database

Contribute Data

Dataset: Th234_activity
Deployment: AII-119-5

Dataset acquisition description

Methodology:

Dataset Processing Description

Database

Contribute Data

Dataset: Th234_activityDeployment: AII-119-5

Dataset acquisition description

Methodology:

Dataset Processing Description

Dataset: Th234_activity
Deployment: AII-119-5