Dataset: GN01 Dissolved REEs OSU
Deployment: HLY1502

Dissolved REE concentrations and Nd isotopes in the Western Arctic Ocean from OSU

Principal Investigator:

Brian Haley (Oregon State University, OSU)

Co-Principal Investigator:

Steven L. Goldstein (Lamont-Doherty Earth Observatory, LDEO)

Howard Scher (University of South Carolina)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: GEOTRACES Arctic Section: Nd isotopes and REEs in the Arctic (Arctic GEOTRACES Nd/eNd)

U.S. Arctic GEOTRACES Study (GN01) (U.S. GEOTRACES Arctic)

Current State:

Final no updates expected

Deployment Synonyms:

GN01, U.S. GEOTRACES Arctic, 32H120150809

Data URL:

https://www.bco-dmo.org/dataset-deployment/788462/data

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Description

This dataset contains data from samples analyzed at Oregon State University (OSU). Additional dissolved REE data are reported by Lamont-Doherty Earth Observatory (LDEO) in a separate dataset (see 'Related Datasets').

Methods & Sampling

Dataset acquisition description

Samples were filtered, acidified, and split at sea. Samples were collected by Niskin bottle. Refer to the cruise report for more information on cruise operations (http://dmoserv3.whoi.edu/data_docs/GEOTRACES/Arctic/ARC01-report.pdf).

For REE concentrations we removed an aliquot before pH-adjustment of each sample. Sample methodology is modified from the Lab #3 methods in Behrens et al. (2006) using a technique pioneered by Tachikawa et al. (1999). Samples were spiked with a mixed 142Ce, 148Nd, and 176Yb enriched isotope spike blend, and 10 ml of this spiked sample was preconcentrated offline using a SeaFast PICO system (ESI). Resulting solutions were analysed at Oregon State University (Corvallis, OR) using a Thermo X-Series II ICP-MS.

We prepared our 5L split for neodymium isotopic analysis following Shabani et al. (1992). Samples were pH-adjusted to pH ~3.5, then pumped through 300 µl of HDEHP in a C18 cartridge to capture REEs. Rare earth elements were eluted from the cartridge using 6M HCl, then Nd was isolated using sequential chromatographic columns: AG50-X8 (BioRad) and Ln-Spec (Eichrom). Neodymium isotopic measurements were made at Oregon State University using a Nu Plasma 3 multicollector ICP-MS (Nu Instruments).

Problem report: Gaps in Nd isotope data are due to errors made during column chromatography. Where the 2-sigma error of epsilon-Nd is ≥0.7, data is flagged with QV:IODE code 3, questionable/suspect quality.

Data Processing Description

Dataset Processing Description

Neodymium isotope ratios were corrected using JNdi-1 standard for reference (Tanaka et al., 2000). Dissolved concentrations were determined by a combination of isotope dilution and external calibration following methods developed by Tachikawa et al. (1999) and used by Lacan and Jeandel (2001) and Jeandel et al. (2013). Calibration standards were diluted and spiked with a mixed 142Ce, 148Nd, and 176Yb enriched isotope spike blend and were pre-concentrated using the same method as the samples. For Ce the concentration was determined by isotope dilution using 142Ce. For the other REEs we determined the concentrations of Nd and Yb in the samples both by isotope dilution and by external calibration, then used these two results to generate a ratio (spiked value / external calibration value) that we applied to the other REEs. Precision was determined by repeated measurements of two in-house seawater samples, one from Bransfeld Strait (~1100m depth) and one from nearshore California (~surface depth). Reported values here of Ce, Nd, and Yb are calculated by isotope dilution, and for other REEs by external calibration modified by the ratio described above.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1458936	NSF Division of Ocean Sciences
OCE-1459513	NSF Division of Ocean Sciences
OCE-1459716	NSF Division of Ocean Sciences

Instruments

Inductively Coupled Plasma Mass Spectrometer

Supplied Name: Nu Plasma 3 multi-collector ICP-MS

Supplied Description:

Neodymium isotopic measurements were made at Oregon State University using a Nu Plasma 3 multi-collector ICP-MS.

Instrument Type

Generic Name: Inductively Coupled Plasma Mass Spectrometer

Acronym: ICP Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/

Generic Description:

An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.

Inductively Coupled Plasma Mass Spectrometer

Supplied Name: Thermo X-Series II ICP-MS

Supplied Description:

Rare earth element dissolved concentrations were analysed at Oregon State University using a Thermo X-Series II ICP-MS.

Instrument Type

Generic Name: Inductively Coupled Plasma Mass Spectrometer

Acronym: ICP Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/

Generic Description:

Niskin bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise identification (GN01; HLY1502)	unitless	cruise_id
STNNBR	Station number	unitless	station
GEOTRC_SAMPNO	Unique GEOTRACES sample number	unitless	sample
CTDDEPTH	Sample depth	meters (m)	depth
DATE	Date; format: yyyymmdd	unitless	date
TIME	Time (UTC); format: HHMM	unitless	time
LATITUDE	Latitude	degrees North	lat
LONGITUDE	Longitude; negative = West	degrees East	lon
La_D_CONC_BOTTLE	Dissolved Concentration of Lanthanum (La) from bottle samples	picomoles per kilogram (pmol/kg)	trace_element_conc
La_D_CONC_BOTTLE_QV_IODE	La_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Ce_D_CONC_BOTTLE	Dissolved Concentration of Cerium (Ce) from bottle samples	pmol/kg	trace_element_conc
Ce_D_CONC_BOTTLE_QV_IODE	Ce_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Pr_D_CONC_BOTTLE	Dissolved Concentration of Praseodymium (Pr) from bottle samples	pmol/kg	trace_element_conc
Pr_D_CONC_BOTTLE_QV_IODE	Pr_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Nd_D_CONC_BOTTLE	Dissolved Concentration of Neodymium (Nd) from bottle samples	pmol/kg	trace_element_conc
Nd_D_CONC_BOTTLE_QV_IODE	Nd_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Sm_D_CONC_BOTTLE	Dissolved Concentration of Samarium (Sm) from bottle samples	pmol/kg	trace_element_conc
Sm_D_CONC_BOTTLE_QV_IODE	Sm_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Eu_D_CONC_BOTTLE	Dissolved Concentration of Europium (Eu) from bottle samples	pmol/kg	trace_element_conc
Eu_D_CONC_BOTTLE_QV_IODE	Eu_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Gd_D_CONC_BOTTLE	Dissolved Concentration of Gadolinium (Gd) from bottle samples	pmol/kg	trace_element_conc
Gd_D_CONC_BOTTLE_QV_IODE	Gd_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Tb_D_CONC_BOTTLE	Dissolved Concentration of Terbium (Tb) from bottle samples	pmol/kg	trace_element_conc
Tb_D_CONC_BOTTLE_QV_IODE	Tb_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Dy_D_CONC_BOTTLE	Dissolved Concentration of Dysprosium (Dy) from bottle samples	pmol/kg	trace_element_conc
Dy_D_CONC_BOTTLE_QV_IODE	Dy_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Ho_D_CONC_BOTTLE	Dissolved Concentration of Holmium (Ho) from bottle samples	pmol/kg	trace_element_conc
Ho_D_CONC_BOTTLE_QV_IODE	Ho_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Er_D_CONC_BOTTLE	Dissolved Concentration of Erbium (Er) from bottle samples	pmol/kg	trace_element_conc
Er_D_CONC_BOTTLE_QV_IODE	Er_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Tm_D_CONC_BOTTLE	Dissolved Concentration of Thulium ( Tm) from bottle samples	pmol/kg	trace_element_conc
Tm_D_CONC_BOTTLE_QV_IODE	Tm_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Yb_D_CONC_BOTTLE	Dissolved Concentration of Ytterbium (Yb) from bottle samples	pmol/kg	trace_element_conc
Yb_D_CONC_BOTTLE_QV_IODE	Yb_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Lu_D_CONC_BOTTLE	Dissolved Concentration of Lutetium (Lu) from bottle samples	pmol/kg	trace_element_conc
Lu_D_CONC_BOTTLE_QV_IODE	Lu_D_CONC_BOTTLE data quality flag using IODE scheme	unitless	q_flag
Nd_143_144_D_EPSILON_BOTTLE	Isotopic ratio of neodymium 143/144 from bottle samples	epsilon units	Nd143_144
Nd_143_144_D_EPSILON_BOTTLE_SD	1-sigma error of Epsilon Nd from bottle samples	epsilon units	Nd143_144
Nd_143_144_D_EPSILON_BOTTLE_QV_IODE	Nd_143_144_D_EPSILON_BOTTLE data quality flag using IODE scheme	unitless	q_flag
ISO_DateTime_UTC	Date and time (UTC) formatted to ISO8601 standard: yyyy-mm-ddTHH:MM	unitless	ISO_DateTime_UTC

Database

Contribute Data

Dataset: GN01 Dissolved REEs OSU
Deployment: HLY1502

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GN01 Dissolved REEs OSUDeployment: HLY1502

Dataset acquisition description

Dataset Processing Description

Dataset: GN01 Dissolved REEs OSU
Deployment: HLY1502