traps_13CDIC

Data Object SedimentTraps - 13C DIC

contact PIs:

name	title
Dr Dorothee C.E. Bakker	Co-Principal Investigator
Dr Tom W. Trull	Principal Investigator
Dr Doug Mackie	Contact

Dataset description

SOIREE Sediment Traps - 13C DIC

Acquisition description

See SOIREE Preliminary Voyage Report

Method notes:
1. All extractions done on 250ml with SOMMA automated acid addition device.
Evolved gas carried in N2 stream to cold trap, and then purified cryogenically from water
DIC yields measured manometrically, 13C-DIC run at 5V by dual-inlet Finnagin Delta-S
MS vs. working standard calibrated against NBS19 calcite.

2. Salinities from CTD - average of 2 meter bin about bottle depth - used for density
calculation for DIC concentrations.

3. Rau G.H., Riebesell U. and Wolf-Gladrow D., 1996, A model of photosynthetic 13C
fractionation by marine phytoplankton based on diffusive molecular CO2 uptake,
MEPS 133, 275-285.

13CO2=13DIC+23.644-(9701.5/Tkelvin)

Difference Bakker-Trull (umol/kg)/Average: -3.7
Difference Bakker-Trull (umol/kg)/SD: 5.24

Processing description

See SOIREE Preliminary Voyage Report

BCO-DMO Processing Notes
Generated from original file SOIREE_Export_final.xls, Tab: 13C DIC
provided on the Deep-Sea Research II 48 (2001) accompanying CD-Rom

BCO-DMO Edits
- parameter names modified to conform to BCO-DMO convention
- date_UTC, time_UTC, lat, lon added from SOIREE_Stations_CTDSampling.xls
- Blank rows in original sheet removed
- 'nd' added to blank cells
- Made column header record one line
- Added 'T' to CTD cast for consistency with other spreadsheets
- Made Date, and Day and Patch Location 3 columns and added to each record
- Formatted Date (NZST) to YYYYMMDD
- Changed 'NaN' to 'nd'

Field Names List

Parameter	Description	Units
date_NZST	date NZST	YYYYMMDD
lon	longitude, negative denotes West	decimal degrees
lat	latitude, negative denotes South	decimal degrees
date_UTC	UTC Date	YYYYMMDD
time_UTC	UTC time	HHMM
depth	Sample depth	meters
Sample_Bottle	Sample Bottle Number	integer
Day	SOIREE Experiment Day	Text
Patch	Patch Location (In/Out)	Text
CTD_cast	CTD Station/Cast Id	Text
sal	CTD Salinity (PSS-78)	dimensionless
Temp_In_situ	In situ temperature	degrees celsius
DIC	DIC	umol/kg
13C_minus_DIC_vs_PDB	13C minus DIC vs PDB	(tbd)
13C_minus_CO2_Rau_etal_97	13C minus CO2 Rau etal 97	(tbd)
B_Depth	Bottle Depth (??)	meters
DIC_Bakker_and_Watson	Bakker and Watson DIC	umol/kg
Notes	Notes	text
DIC_Difference_Bakker_minus_Trull	DIC Difference Bakker minus Trull	umol/kg

Platforms List

R/V Tangaroa 61TG_3052

Instruments List

Sediment Trap:
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
CTD Seabird 911:
NIWA's Seabird 911plus CTD and related instrumentation

This document is created from the content of the BCO-DMO metadata database. 2010-03-16 21:48:49

info app: /home/bco/dbase-v2 v.100108 CLC
Data URL: http://data.bco-dmo.org/jg/serv/BCO/Fe_Synthesis/SOIREE/61TG_3052/traps_13CDIC.