Dataset: SedimentTraps - 234-Thorium Flux

Name: 234-Thorium Flux from sediment traps from R/V Tangaroa cruise 61TG_3052 in the Southern Ocean in 1999 (SOIREE project)
Published: 2009-08-25
Keywords: oceans

Cite This Dataset

Project:

Southern Ocean Iron Release Experiment (SOIREE)

Program:

Iron Synthesis (FeSynth)

Principal Investigator:

Matthew A. Charette (Woods Hole Oceanographic Institution, WHOI)

Contact:

Doug Mackie (University of Otago)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI)

Version:

25August2009

Version Date:

2009-08-25

Validated:

Yes

Current State:

Final no updates expected

234-Thorium Flux from sediment traps from R/V Tangaroa cruise 61TG_3052 in the Southern Ocean in 1999 (SOIREE project)

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Description

SOIREE Sediment Traps - 234-Thorium Flux

Methods & Sampling

See SOIREE Preliminary Voyage Report

METHOD:

Contents of 3 traps were combined, filtered and 234-thorium concentrations
determined (in disintegrations per minute, dpm)

POC contents of subsamples from the same filter were determined using a CHN analyser

Analytical Th method: refer to Charette and Buesseler (2000)
Geochemistry, Geophysics, Geosystems, paper#GC000069.

Data Processing Description

See SOIREE Preliminary Voyage Report

BCO-DMO Processing Notes

Generated from original file SOIREE_Export_final.xls, Tab: TrapThFlux

provided on the Deep-Sea Research II 48 (2001) accompanying CD-Rom

BCO-DMO Edits

- parameter names modified to conform to BCO-DMO convention

- Blank rows in original sheet removed

- 'nd' added to blank cells

- Made column header record one line

- Formatted Date to YYYYMMDD

- Dates, Times, Lat, Lons added from file: SOIREE_SedimentTraps_TrapDeploy.xls

Data Files

File
traps_ThFlux.csv (Comma Separated Values (.csv), 785 bytes) MD5:801a76149855eb76c90c5c0c7bb157f3 Primary data file for dataset ID 2858

More Information about this dataset

Funding Sources

None available yet

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
61TG_3052	SOIREE	1999-01-31	R/V Tangaroa	Philip W. Boyd (Chief Scientist)	data info

Instruments

Sediment Trap

Supplied Description:

MULTI-trap dimensions:

Length (L, m): 0.58 Trap length with baffles inserted;

L without baffles: 0.525 m

AR without baffles: 7.50

Trap volume without baffles: 2.021 litres

Inside diameter (Di, m): 0.07

Outside diameter (Do, m): 0.08

Aspect ratio (AR): 8.29

Aspect ratio with salt (AR): 7.29 Basal brine added to a height of 1-trap diameter (7 cm)

Collection area (A, m2): 0.00385

Trap volume (V, m3): 0.00223

Trap volume (V, litres): 2.232

Baffle length (Lb, m): 0.08

Baffle diameter (Dib, m): 0.01

Baffle aspect ratio (ARb): 5.77

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

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Patch	Patch Location (In/Out)	text	no_bcodmo_term
TIME_STATION	SOIREE Experiment Day T1 = 0000 h NZST 10/02/99 + 24 hours Used here as station identifier	text	no_bcodmo_term
Date_Start_NZST	Start date of trap deployment (NZST)	YYYYMMDD	date_begin
Time_Start_NZST	Start time of trap deployment (NZST)	HHMM	time_begin
lat_Start	Start latitude of trap deployment negative denotes South	decimal degrees	lat_begin
lon_Start	Start longitude of trap deployment negative denotes West	decimal degrees	lon_begin
lat_End	End latitude of trap deployment negative denotes South	decimal degrees	lat_end
lon_End	End longitude of trap deployment negative denotes West	decimal degrees	lon_end
Date_End_NZST	End date of trap deployment (NZST)	YYYYMMDD	date_end
Time_End_NZST	End time of trap deployment (NZST)	HHMM	time_end
Th	Th	dpm	Th234_tot
POC	POC	umol	POC
Th_flux	Th flux	dpm/m2/d	no_bcodmo_term
POC_flux_mmol	POC flux in mmol/m2/d	mmol/m2/d	no_bcodmo_term
POC_flux_mg	POC flux in mg/m2/d	mg/m2/d	no_bcodmo_term
POC_to_Th	POC to Th	mmol/dpm	no_bcodmo_term

Database

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Dataset: SedimentTraps - 234-Thorium Flux