Dataset: th234_irs
Deployment: TT011

Thorium-234 flux rates

Principal Investigator:

Dr John Hedges (University of Washington, UW)

Co-Principal Investigator:

Cindy Lee (Stony Brook University, SUNY Stony Brook)

Stuart Wakeham (Skidaway Institute of Oceanography, SkIO)

BCO-DMO Data Manager:

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

Project:

U.S. JGOFS Equatorial Pacific (EqPac)

Version:

June, 1996

Deployment Synonyms:

EqPac Fall Survey

Version Date:

1996-06-15

Data URL:

https://www.bco-dmo.org/dataset-deployment/450907/data

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Description

Thorium-234 flux rates from Indented Rotary Sphere Floating Sed. Traps

Methods & Sampling

Dataset acquisition description

See Platform deployments for cruise specific documentation

Deployment-specific acquisition description

   PI:              (1)John Hedges, (2)Stuart Wakeham & (3)Cindy Lee
   of:              (1)University of Washington
                    (2) Skidaway Institute of Oceanography
                    (3)State University of New York, Stony Brook
   dataset:         Thorium-234 flux rates Indented Rotary Sphere
                    sediment trap samples
   dates:           August 10, 1992 to September 07, 1992
   location:        N: 12.0133  S: -5.005  W: -140.0498  E: -139.9224
   project/cruise:  EqPac/TT011 - Fall Survey
   ship:            Thomas Thompson
 
   All traps deployed at approximately 100 meters
 
   Sampling Methodology
   Sampling Protocols

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Instruments

Sediment Trap - Floating

Supplied Name: Floating Sediment Trap

Supplied Description:

Instrument Type

Generic Name: Sediment Trap - Floating

Acronym: Sed Trap - Float

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

Generic Description:

Floating sediment traps are specially designed sampling devices deployed to float in the water column (as opposed to being secured to a mooring at a fixed depth) for periods of time to collect particles from the water column that are falling toward the sea floor. In general a sediment trap has a container 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. The 'Sediment Trap -Floating' designation is used for a floating type of sediment trap about which no other design details are known.

Sediment Trap - IRS

Supplied Name: IRS Sediment Trap

Supplied Description:

Instrument Type

Generic Name: Sediment Trap - IRS

Acronym: Sed Trap - IRS

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. The Indented Rotating Sphere (IRS) Sediment Trap is described in Peterson et al. (Field evaluation of a valved sediment trap. 1993. Limnology and Oceanography, 38, pp. 1741-1761 and Novel techniques for collection of sinking particles in the ocean and determining their settling rates. 2005. Limnology and Oceanography Methods 3, pp. 520-532). The IRS trap consists of four cylindrical modules; a particle interceptor, an IRS valve; a skewed funnel, and an eleven sample carousel (designated IRSC trap). The key to the trap design is the patented IRS valve located between the particle interceptor and particle accumulator portions of the trap. The valve and carousel are regulated by a TattleTale IVA (manufactured by Onset Computer Corp.) microprocessor and custom software. The IRS sediment trap was specifically designed to exclude zooplankton (Trull et al. 2008. Deep-Sea Research II v.55 pp. 1684-1695).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
event	event number for trap deployment from event log		event
date_end	date trap recovered also defined as event number for trap recovery	MMDDHHmm	no_bcodmo_term
sta	station number from event log		no_bcodmo_term
lat_n	nominal latitude of trap along 140 W (negative = south)	whole degrees	no_bcodmo_term
Th234_p_f	Particle Thorium-234 flux rate (dpm = disintegrations per minute)	dpm/cm2/day	no_bcodmo_term

Database

Contribute Data

Dataset: th234_irs
Deployment: TT011

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: th234_irsDeployment: TT011

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Dataset: th234_irs
Deployment: TT011