Dataset: Atlantic Sediment Radiocarbon

Name: Atlantic sediment radiocarbon from mult-corer samples collected in the Amazon Delta and Sierra Leone Rise during R/V Endeavor cruises EN-480 and EN-481 in 2010
Published: 2023-09-14
Keywords: Black carbon, radiocarbon, sediments, Atlantic Ocean, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.908387.1

Spatial Extent: N:7.4353 E:-21.2436 S:4.2828 W:-47.4844

Temporal Extent: 2010-07-17 - 2010-08-13

Project:

Concentrations and source assessment of black carbon across tropical Atlantic air and sediment (Tropical Atlantic Black Carbon)

The Black Carbon Cycle: Budget and Fluxes of Black Carbon in South Atlantic Sediments (Black Carbon Cycle)

Principal Investigator:

Rainer Lohmann (University of Rhode Island, URI)

Scientist:

Kari Ann St. Laurent (University of Rhode Island, URI)

Student:

Kari Ann St. Laurent (University of Rhode Island, URI)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-09-14

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Atlantic sediment radiocarbon from mult-corer samples collected in the Amazon Delta and Sierra Leone Rise during R/V Endeavor cruises EN-480 and EN-481 in 2010

Abstract:

These data include the sediment radiocarbon analysis for Amazon Delta and Sierra Leone Rise Sediments. These data were collected on multiple cruises in throughout the Atlantic; specifically, in the Amazon Delta (EN-480; July 2010) and Sierra Leone Rise (EN-481; August 2010). Sediments were collected using multi-corer and kept frozen until analysis. Radiocarbon was measured for the Amazon Delta and Sierra Leone Rise regions at the National Ocean Sciences-Accelerator Mass Spectrometry (NOSAMS) facility at Woods Hole Oceanographic Institute using the ‘reconnaissance’ method. These data were published in St.Laurent, et al. (2023).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2023-09-14	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.908387.1	2023-10-06

Methods & Sampling

Sediment samples were collected via a 4-barrel multi-corer (R/V Endeavor, segmented into 1-2 cm sections, dried in a drying oven (35°C) and homogenized via mortar and pestle. Sediments were decalcified using 10% hydrochloric acid. Black carbon was isolated using the chemothermal oxidation at 375°C method.

Radiocarbon data were analyzed at the National Ocean Sciences Accelerator Mass Spectrometry Facility (NOSAMS) at the Woods Hole Oceanic Institute using the “reconnaissance” method as described by Burke et al., 2010 and McIntyre et al., 2011. The blank-corrected fraction modern is also reported as described by Burke et al., 2010. The AMS is a commissioned continuous-flow AMS system.

Instruments:

Both the total organic carbon (~0.10 to 0.35 mgC) and black carbon (~0.15 to 0.80 mgC) samples were combusted into carbon dioxide using a modified elemental analyzer and then converted to graphite using a zinc reduction method before analysis on an Accelerator Mass Spectrometer.

LOCATION:
Amazon Delta (approximately: 4 N, 47 W; 2400-3500m); Sierra Leone Rise (approximately: 7 N, 20 W; 2800-3800m).

BCO-DMO Processing

* Sheet 1 of file "Atlantic Sediment 14C.xlsx" was imported into the BCO-DMO data system.
* * Column names adjusted to conform to BCO-DMO naming conventions designed to support broad re-use by a variety of research tools and scripting languages. [Only numbers, letters, and underscores. Can not start with a number]
* Date format converted to ISO 8601 format.

Data Files

File
Atlantic Sediment Radiocarbon filename: 908387_v1_atlantic-sediment-radiocarbon.csv (Comma Separated Values (.csv), 2.33 KB) MD5:00377577c09d57e35ef235a359910d87 Primary data table for dataset 908387 version 1.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1924191
NSF Division of Ocean Sciences	OCE-0851044

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
EN480	EN-480	2010-07-13	R/V Endeavor	Rainer Lohmann (Chief Scientist)	data info
EN481	EN-481	2010-07-25	R/V Endeavor	Rainer Lohmann (Chief Scientist)	data info

Instruments

Accelerator Mass Spectrometer

Supplied Name: continuous-flow AMS system

Supplied Description:

Instrument Type

Generic Name: Accelerator Mass Spectrometer

Acronym: AMS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB17/

Generic Description:

An AMS measures "long-lived radionuclides that occur naturally in our environment. AMS uses a particle accelerator in conjunction with ion sources, large magnets, and detectors to separate out interferences and count single atoms in the presence of 1x1015 (a thousand million million) stable atoms, measuring the mass-to-charge ratio of the products of sample molecule disassociation, atom ionization and ion acceleration." AMS permits ultra low-level measurement of compound concentrations and isotope ratios that traditional alpha-spectrometry cannot provide. More from Purdue University: http://www.physics.purdue.edu/primelab/introduction/ams.html

Multi Corer

Supplied Name: 4-barrel multi-corer

Supplied Description:

Sediment samples were collected via a 4-barrel multi-corer

Instrument Type

Generic Name: Multi Corer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/51/

Generic Description:

The Multi Corer is a benthic coring device used to collect multiple, simultaneous, undisturbed sediment/water samples from the seafloor. Multiple coring tubes with varying sampling capacity depending on tube dimensions are mounted in a frame designed to sample the deep ocean seafloor. For more information, see Barnett et al. (1984) in Oceanologica Acta, 7, pp. 399-408.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Site	Numerical sediment core name	unitless	site
Depth_Interval	sediment depth interval	cenitmeters below seafloor (cmbsf)	depth_bsf
Date	Core date Format: %Y-%m-%d	unitless	date
Lat	Core sample location latitude	decimal degrees	lat
Lon	Core sample location longitude	decmial degrees	lon
Carbon_Fraction	The fraction of carbon measured (Total Organic Carbon or Black Carbon)	unitless	C_org
Fm_Measured	The measured 14C fraction modern	14C years	no_bcodmo_term
Norm_del13C	The normalized stable carbon isotope ratio	per mil (0/00)	d13C
Fm_Stdev	Standard deviation of the 14C fraction modern	14C years	no_bcodmo_term
Fm_Corrected	The blank corrected 14C fraction modern	14C years	no_bcodmo_term
Fmc_Stdev	Standard deviation of the blank corrected 14C fraction modern	14C years	no_bcodmo_term

Status message

Database

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Dataset: Atlantic Sediment Radiocarbon