Dataset: ETNP dissolved Cd, Ni, Mn, and light rare earth elements (La, Ce, Pr, and Nd)

Name: Concentrations of dissolved cadmium, nickel, manganese, lanthanum, cerium, praseodymium, and neodymium from the Eastern Tropical North Pacific Ocean on R/V Revelle cruise RR1804-1805 (OMZ Nutrient Cycling project)
Published: 2022-03-25
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.872434.1

Spatial Extent: N:26.96 E:-105.69 S:14 W:-128

Temporal Extent: 2018-04-16 - 2018-04-27

Project:

The role of cryptic nutrient cycling within sinking particles on trace element transport in oxygen minimum zones (OMZ Nutrient Cycling)

Principal Investigator:

Seth G. John (University of Southern California, USC)

Co-Principal Investigator:

James W. Moffett (University of Southern California, USC)

Student:

Xiaopeng Bian (University of Southern California, USC)

Contact:

Xiaopeng Bian (University of Southern California, USC)

BCO-DMO Data Manager:

Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2022-03-25

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Concentrations of dissolved cadmium, nickel, manganese, lanthanum, cerium, praseodymium, and neodymium from the Eastern Tropical North Pacific Ocean on R/V Revelle cruise RR1804-1805 (OMZ Nutrient Cycling project)

Abstract:

Oxygen deficient zones (ODZs) play an important role in the distribution and cycling of trace metals in the ocean, as important sources of metals including Fe and Mn to the ocean, and also as possible sinks of chalcophile elements such as Cd. The Eastern Tropical North Pacific (ETNP) ODZ is one of the three largest ODZs worldwide. Here we present results from two sectional surveys through the ETNP ODZ (23N-14N, 105W-130W) conducted during two cruises of the R/V Roger Revelle, RR1804 and RR1805, from March to April 2018, providing a high-resolution concentrations of dissolved Cd, Ni, Mn, La, Ce, Pr, and Nd in seawater.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2022-03-25	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.872434.1	2023-03-09

Methods & Sampling

Methodology:

Sampling and analytical procedures:

During RR1804 cruise, regular Niskin bottles (12 L GO-FLO bottles) and Seabird CTD rosette were used to collect seawater samples. Each seawater sample was collected into an acid-cleaned LDPE bottle on board and then filtered in a trace metal clean (TMC) “bubble” on the boat using an AcroPakTM 0.2µm filter and a peristaltic pump and stored in 50 mL low density polyethylene (LDPE) centrifuge tubes.

During RR1805 cruise, the trace metal clean technique was used to collect seawater samples from the upper 700 m of the water column using 5 L acid-cleaned Teflon-coated external-spring “Niskin-type” bottles (Ocean Test Equipment) on a powder‐coated trace metal clean rosette (Sea‐Bird Electronics). After collection, seawater was filtered through acid-washed 47 mm diameter 0.2 μm Supor polyethersulfone filters (Pall) and collected into acid-washed 1L LDPE bottles (Nalgene).

Seawater samples were acidified to pH 2 with concentrated, distilled HCl (0.1% v/v) in the clean lab at University of Southern California (USC). After acidification, seawater samples were stored for three months before trace metal analysis.

Metal concentration analyses were identical to those used in Hawco et al. (2020). For each sample, 15 mL seawater was transferred to a 15 mL tube, then 50 uL of an isotope spike (containing 57Fe, 62Ni, 65Cu, 67Zn, 207Pb, and 110Cd) was added to the 15 mL tube and thoroughly mixed with the sample. The samples would then sit overnight before they were preconcentrated by seaFAST system. The seaFAST system helped to preconcentrate the seawater samples and remove the salt matrix. About 10 mL of seawater was injected through the Nobias PA-1 column of seaFAST and 0.5 mL eluent (1M HNO3 containing 1 ppb In) was used to elute trace metals for concentration measurement. The trace metal concentrations were then measured by an Element 2 single collector sector field ICP-MS. Concentrations of Cd and Ni were derived by using an isotope dilution method. Concentrations of Mn and LREEs (La, Ce, Pr, and Nd) were quantified relative to the 10 ppb standard and corrected for incomplete sample loading using the recovery of Ni (Hawco et al., 2020). Trace metal concentrations were converted from nmol/L (or pmol/L) to nmol/kg (or pmol/kg) using a seawater density of 1.025 kg/L.

Data Processing Description

Researcher processing notes:

The data reduction algorithms are identical to those used in Hawco et. al. (2020), coded in Excel 2016.

BCO-DMO processing notes:

Converted date format from %m/%d/%y to %Y-%m-%d
Added a ISO formatted DateTime column

Data Files

File
etnp_cd_ni_mn_lrees-1.csv (Comma Separated Values (.csv), 41.87 KB) MD5:cd451a639c5177e29da4030bb12bf166 Primary data file for dataset ID 872434

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1636332

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR1804		2018-03-27	R/V Roger Revelle	Richard Keil (Chief Scientist)	data info
RR1805		2018-04-14	R/V Roger Revelle	Richard Keil (Chief Scientist)	data info

Instruments

CTD Sea-Bird

Supplied Name: Powder-coated trace metal clean rosette (Sea-Bird Electronics)

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.

Inductively Coupled Plasma Mass Spectrometer

Supplied Name: ICP-MS (Thermo Element 2)

Supplied Description:

Concentrations were determined using a high-resolution ICP-MS (Thermo Element 2) with a PC3 desolvation system.

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.

Niskin bottle

Supplied Name: 5L “Niskin-type” bottles (Ocean Test Equipment)

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.

SeaFAST Automated Preconcentration System

Supplied Name: SeaFAST Automated Preconcentration System (Elemental Scientific)

Supplied Description:

Preconcentration and purification of seawater were conducted using a seaFAST Automated Preconcentration System (Elemental Scientific).

Instrument Type

Generic Name: SeaFAST Automated Preconcentration System

Generic Description:

The seaFAST is an automated sample introduction system for analysis of seawater and other high matrix samples for analyses by ICPMS (Inductively Coupled Plasma Mass Spectrometry).

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise_id	Cruise identifier	unitless	cruiseid
Bottle	Bottle identifier	unitless	bottle
Station	Station identifier	unitless	sta_id
Depth	Sample depth below the sea surface	meters (m)	depth
Cd_TD_CONC_BOTTLE	Total dissolved Cd (<0.2 µm)	nanomoles per kilogram (nmol/kg)	trace_metal_conc
Ni_TD_CONC_BOTTLE	Total dissolved Ni (<0.2 µm)	nanomoles per kilogram (nmol/kg)	trace_metal_conc
Mn_TD_CONC_BOTTLE	Total dissolved Mn (<0.2 µm)	nanomoles per kilogram (nmol/kg)	trace_metal_conc
La_TD_CONC_BOTTLE	Total dissolved La (<0.2 µm)	picomoles per kilogram (pmol/kg)	trace_metal_conc
Ce_TD_CONC_BOTTLE	Total dissolved Ce (<0.2 µm)	picomoles per kilogram (pmol/kg)	trace_metal_conc
Pr_TD_CONC_BOTTLE	Total dissolved Pr (<0.2 µm)	picomoles per kilogram (pmol/kg)	trace_metal_conc
Nd_TD_CONC_BOTTLE	Total dissolved Nd (<0.2 µm)	picomoles per kilogram (pmol/kg)	trace_metal_conc
Longitude	Longitude in decimal degrees East, west is negative	decimal degrees	lon
Latitude	Latitude in decimal degrees North, north is positive.	decimal degrees	lat
Date	Date (UTC) when sample was collected, in format %Y-%m-%d Format: %Y-%m-%d	unitless	date
Time_UTC	Start time (UTC) of sampling, in format %H:%M:%S Format: %H:%M:%S	unitless	time_sample
ISO_DateTime_UTC	Start datetime (UTC) of sampling, in format %Y-%m-%dT%H:%M:%SZ Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC

Status message

Database

Contribute Data

Dataset: ETNP dissolved Cd, Ni, Mn, and light rare earth elements (La, Ce, Pr, and Nd)