Dataset: SedimentTraps - Size-Frac Th POC PON 13Corg
Deployment: 61TG_3052

Sediment Traps - Size-Fractionated Th, POC/PON, 13Corg results

Principal Investigator:

Tom W. Trull (University of Tasmania, UTAS)

Co-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)

Project:

Southern Ocean Iron Release Experiment (SOIREE)

Current State:

Final no updates expected

Version:

26August2009

Deployment Synonyms:

SOIREE

Version Date:

2009-08-26

Data URL:

https://www.bco-dmo.org/dataset-deployment/451441/data

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Description

SOIREE Sediment Traps - Size-Fractionated Th, POC/PON, 13Corg results

Methods & Sampling

Dataset acquisition description

See SOIREE Preliminary Voyage Report

Notes
A. CHN
1. Both silver and QMA samples were analysed by punching a sub-sample using a 4.16mm punch.
These were then acidified with 20ul of 50% HCl in silver cups, dried, reweighed to estimate
carbonate loss (squat-all) and combusted in our Carlo-Erba.

2. The number of punches taken for each sample varied according to how much material it had.
The spreadsheet calculates the umol C on the TOTAL filter based on the # of punches, punch
area and effective filtration area. To get the effective filtration area for a silver filter
I measured the diameter that material covered to be 22.88mm. For the QMA I took it to be 140mm.

3. For the 2 overloaded samples 41C and 105C, I (Trull) used the weight ratios to calculate
the total umol C that must have been on the filter. The tare of empty petri-dish with lid
and blank silver filter was 8.91639g. Estimating the total material weight by either using
Charette's initial weight and subtracting this tare, or using Trull's final weight (minus the
same tare) and adding back in your and my sub-aliquots agrees to better than 3mg (105C) and
1.5mg (41C) in comparison to ~400mg totals, suggesting errors of under 1% from the tare correction.

4. Measured QMA and Silver filter blanks were small (single determinations, and not true field blanks)

B. 13Corg
1. Samples prepared exactly as for CHN. Blank determinations again from single blank determinations.
Standardisation to NBS22 Oil, same as for SizeFractionatedPumped Particles - see that sheet.

2. Blank corrections from single Ag and QMA samples

Ag filter blank		1 punch		1		0.03	below detect	1.0
QMA-Blnk		2 punches	2		0.01	below detect	5.1
							
brass punch area(mm2)		 					
	13.59		 					
Agfilter area (mm2)		QMA filter area					
	411.14				15393.35					
fraction sampled		fraction sampled					
by one Ag punch			by oneQMA punch					
	0.03				0

SOIREE Size-Fractionated Th, POC/PON, 13Corg results (Trull, Charette)
13Corg data reported in Trull and Armand, DSR-II.

Data Processing Description

Dataset Processing Description

See SOIREE Preliminary Voyage Report

BCO-DMO Processing Notes
Generated from original file SOIREE_Export_final.xls, Tab: SizeFractionatedPumpedParticles
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
- date_UTC, time_UTC, lat/lon inserted manually from Master Station list

More information about this dataset deployment

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

Supplied Name	Supplied description	Supplied Units	Standard Name
lon	longitude, negative denotes West	decimal degrees	lon
lat	latitude, negative denotes South	decimal degrees	lat
date_UTC	UTC Date	YYYYMMDD	date
time_UTC	UTC time	HHMM	time
depth	Sample depth	meters	depth
Site	Site Id	text	no_bcodmo_term
station	Station Id Determined by SDN 28 Aug 2000 based on POC/CTD stations	text	station
volume_filtered	volume_filtered	liters	vol_filt
sample	sample number	integer	sample
name	Sample name	text	no_bcodmo_term
size_microns	size in microns	microns	no_bcodmo_term
Trull_punches_or_wgt	number of punches or sample weight	mg	no_bcodmo_term
Trull_tot_wgt	Trull total weight	mg	no_bcodmo_term
Trull_umol_C_measured	Trull umol C measured	umol	no_bcodmo_term
Trull_C_to_N_ratio	Trull C/N ratio	dimensionless ratio	no_bcodmo_term
Trull_umol_C_on_filter	Trull umol C on filter	umol	no_bcodmo_term
Trull_umol_C_blank_corr	Trull umol C blank corr	umol	no_bcodmo_term
Trull_umol_C_per_litre	Trull umol C per litre	umol/liter	no_bcodmo_term
Trull_20_to_5_ratio	Trull 20/5 ratio	dimensionless ratio	no_bcodmo_term
Trull_Sum_POC_uM_all_fractions	Trull Sum POC uM all fractions	microM	no_bcodmo_term
Charette_POC_QMA_only	Charette POC QMA only	microM	no_bcodmo_term
Charette_Trull_POC_comparison	Charette Trull POC comparison	microM	no_bcodmo_term
Trull_13Corg_measured	Trull 13Corg measured	(tbd)	no_bcodmo_term
Trull_13Corg_blnk_corr	Trull 13Corg blnk corr	(tbd)	no_bcodmo_term
Trull_13Corg_NBS22std	Trull 13Corg NBS22std	(tbd)	no_bcodmo_term

Database

Contribute Data

Dataset: SedimentTraps - Size-Frac Th POC PON 13Corg
Deployment: 61TG_3052

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: SedimentTraps - Size-Frac Th POC PON 13CorgDeployment: 61TG_3052

Dataset acquisition description

Dataset Processing Description

Dataset: SedimentTraps - Size-Frac Th POC PON 13Corg
Deployment: 61TG_3052