Dataset: GP15 Pb and Pb Isotopes Leg 1

Name: Lead (Pb) concentrations and Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb) from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018
Published: 2024-11-01
Keywords: central Pacific, Pb, Pb isotopes, U.S. GEOTRACES, Pacific Meridional Transect, PMT, GP15, oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:56.059 E:-152 S:22 W:-156.962

GP15 Pacific Meridional Transect along 152W

Temporal Extent: 2018-09-26 - 2018-10-19

Project:

Collaborative Research: US GEOTRACES PMT: Pb and Cr isotopes (PMT Pb and Cr)

US GEOTRACES Pacific Meridional Transect (GP15) (U.S. GEOTRACES PMT)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

Edward A. Boyle (Massachusetts Institute of Technology, MIT)

Scientist:

Nathan Lanning (Massachusetts Institute of Technology, MIT)

Student:

Shuo Jiang (East China Normal University, ECNU)

BCO-DMO Data Manager:

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

Version:

Version Date:

2024-11-01

Restricted:

Yes

Release Date:

2025-02-01

Validated:

Current State:

Data not available

Lead (Pb) concentrations and Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb) from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018

Abstract:

During September 23 to November 22, 2018, the R/V Roger Revelle completed a trace element (and their isotopes) hydrographic section along ~152° West from 56° North to 20° South (GEOTRACES GP15). Full water column trace metal clean samples were obtained with the U.S. GEOTRACES Carousel (GTC) composed of 24 12-liter trace metal clean GO-Flow sampling systems mounted on a trace metal free powder-coated titanium rosette system. Three of the stations had lead (Pb) concentrations determined at Massachusetts Institute of Technology (MIT) by isotope dilution quadrupole inductively coupled plasma mass spectrometry (ICPMS) for intercalibration with the Texas A&M (TAMU) lab of Jessica Fitzsimmons who analyzed all of the cruise stations. The rest of the full- and super-stations were analyzed at MIT for Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb). These data are collected to document the penetration of atmosphericly-transported anthropogenic Pb into the ocean and its subsequent dispersion by circulation and chemical interactions between sinking particles and Pb dissolved in solution. Shuo Jiang, Nathan Lanning, and Edward Boyle performed the extractions and the ICPMS analyses.

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Methods & Sampling

Three of the stations had lead (Pb) concentrations determined at Massachusetts Institute of Technology (MIT) by isotope dilution quadrupole inductively coupled plasma mass spectrometry (ICPMS) (VG Plasmaquad 2+) for intercalibration with the Texas A&M (TAMU) lab of Jessica Fitzsimmons who analyzed all of the cruise stations. The rest of the full- and super-stations were analyzed at MIT for Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb) after Pb extraction and purification on a GV Isoprobe multicollector magnetic sector plasma mass spectrometer with calibration to NBS981 standard.

Data Processing Description

Quality Flags:
The standard Ocean Data View flags were used (reference all flags at https://www.bodc.ac.uk/data/codes_and_formats/odv_format/):

1: Good Value: Good quality data value that is not part of any identified malfunction and has been verified as consistent with real phenomena during the quality control process.

2: Probably Good Value: Data value that is probably consistent with real phenomena but this is unconfirmed or data value forming part of a malfunction that is considered too small to affect the overall quality of the data object of which it is a part. [Used when only one replicate confirmed the reported value.]

3: Probably Bad Value: Data value recognized as unusual during quality control that forms part of a feature that is probably inconsistent with real phenomena.

4: Bad Value: An obviously erroneous data value.

BCO-DMO Processing

- Imported original file "RR1814_dataTemplate.xlsx" into the BCO-DMO system.
- Renamed fields to comply with BCO-DMO naming conventions.
- Created date-time fields in ISO 8601 format.
- Removed the original date and time columns.
- Removed empty columns: Gear_ID, Rosette_Position, End_Latitude, End_Longitude
- Saved the final file as "933318_v1_gp15_pb_and_pb_isotopes_leg1.csv".

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1736996

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR1814	GP15 GP15 Leg1 33RR20180918 PMT US GEOTRACES PMT	2018-09-18	R/V Roger Revelle	Gregory A. Cutter (Chief Scientist) Karen L. Casciotti (Co-Chief Scientist) Phoebe J. Lam (Co-Chief Scientist)	data info

Instruments

GO-FLO Bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: GO-FLO Bottle

Acronym: GO-FLO

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/30/

Generic Description:

GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Inductively Coupled Plasma Mass Spectrometer

Supplied Name: quadrupole ICPMS (VG Plasmaquad 2+)

Supplied Description:

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.

Multi Collector Inductively Coupled Plasma Mass Spectrometer

Supplied Name: GV Isoprobe multicollector magnetic sector plasma mass spectrometer

Supplied Description:

Instrument Type

Generic Name: Multi Collector Inductively Coupled Plasma Mass Spectrometer

Acronym: MC-ICPMS

Generic Description:

A Multi Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) is a type of mass spectrometry where the sample is ionized in a plasma (a partially ionized gas, such as Argon, containing free electrons) that has been generated by electromagnetic induction. A series of collectors is used to detect several ion beams simultaneously.

A MC-ICPMS is a hybrid mass spectrometer that combines the advantages of an inductively coupled plasma source and the precise measurements of a magnetic sector multicollector mass spectrometer. The primary advantage of the MC-ICPMS is its ability to analyze a broader range of elements, including those with high ionization potential that are difficult to analyze by Thermal Ionization Mass Spectrometry (TIMS). The ICP source also allows flexibility in how samples are introduced to the mass spectrometer and allows the analysis of samples introduced either as an aspirated solution or as an aerosol produced by laser ablation.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Station_ID	Station ID number	unitless	station
Event_ID	Event ID number	unitless	event
Start_ISO_DateTime_UTC	Date and time (UTC) at start of the sample collection event Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
End_ISO_DateTime_UTC	Date and time (UTC) at end of the sample collection event Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Start_Latitude	Latitude at start of event; negative values = South	decimal degrees	lat
Start_Longitude	Longitude at start of event; negative values = West	decimal degrees	lon
Sample_ID	GEOTRACES sample ID number	unitless	sample
Sample_Depth	Sample depth	meters (m)	depth
Pb_206_207_D_RATIO_BOTTLE_h0hu59	Atom ratio of given isotopes for dissolved Pb referenced to {NBS981} from bottle samples	unitless	Pb
SD2_Pb_206_207_D_RATIO_BOTTLE_h0hu59	Two standard deviations of Pb_206_204_D_RATIO_BOTTLE_nyhdyg	unitless	Pb
Flag_Pb_206_207_D_RATIO_BOTTLE_h0hu59	ODV qualtity flag for Pb_206_204_D_RATIO_BOTTLE_nyhdyg	unitless	q_flag
Pb_208_207_D_RATIO_BOTTLE_o5msvl	Atom ratio of given isotopes for dissolved Pb referenced to {NBS981} from bottle samples	unitless	Pb
SD1_Pb_208_207_D_RATIO_BOTTLE_o5msvl	One standard deviation of Pb_208_207_D_RATIO_BOTTLE_o5msvl	unitless	Pb
Flag_Pb_208_207_D_RATIO_BOTTLE_o5msvl	ODV qualtity flag for Pb_208_207_D_RATIO_BOTTLE_o5msvl	unitless	q_flag
Pb_206_207_D_RATIO_FISH_ezjekv	Atom ratio of given isotopes for dissolved Pb referenced to {NBS981} from towed GeoFish samples	unitless	Pb
SD1_Pb_206_207_D_RATIO_FISH_ezjekv	One standard deviation of Pb_206_207_D_RATIO_FISH_ezjekv	unitless	Pb
Flag_Pb_206_207_D_RATIO_FISH_ezjekv	ODV qualtity flag for Pb_206_207_D_RATIO_FISH_ezjekv	unitless	q_flag
Pb_208_207_D_RATIO_FISH_tg7x8e	Atom ratio of given isotopes for dissolved Pb referenced to {NBS981} from towed GeoFish samples	unitless	Pb
SD1_Pb_208_207_D_RATIO_FISH_tg7x8e	One standard deviation of Pb_208_207_D_RATIO_FISH_tg7x8e	unitless	Pb
Flag_Pb_208_207_D_RATIO_FISH_tg7x8e	ODV qualtity flag for Pb_208_207_D_RATIO_FISH_tg7x8e	unitless	q_flag
Pb_D_CONC_FISH_zkhacb	Concentration of dissolved Pb from towed GeoFish samples	picomoles per kilogram (pmol/kg)	Pb
SD1_Pb_D_CONC_FISH_zkhacb	One standard deviation of Pb_D_CONC_FISH_zkhacb	picomoles per kilogram (pmol/kg)	Pb
Flag_Pb_D_CONC_FISH_zkhacb	ODV qualtity flag for Pb_D_CONC_FISH_zkhacb	unitless	q_flag
Pb_206_204_D_RATIO_FISH_bkyzgo	Atom ratio of given isotopes for dissolved Pb referenced to {NBS981} from towed GeoFish samples	unitless	Pb
SD1_Pb_206_204_D_RATIO_FISH_bkyzgo	One standard deviation of Pb_206_204_D_RATIO_FISH_bkyzgo	unitless	Pb
Flag_Pb_206_204_D_RATIO_FISH_bkyzgo	ODV qualtity flag for Pb_206_204_D_RATIO_FISH_bkyzgo	unitless	q_flag
Pb_D_CONC_BOTTLE_pu5g1q	Concentration of dissolved Pb from bottle samples	picomoles per kilogram (pmol/kg)	Pb
SD1_Pb_D_CONC_BOTTLE_pu5g1q	One standard deviation of Pb_D_CONC_BOTTLE_pu5g1q	picomoles per kilogram (pmol/kg)	Pb
Flag_Pb_D_CONC_BOTTLE_pu5g1q	ODV qualtity flag for Pb_D_CONC_BOTTLE_pu5g1q	unitless	q_flag
Pb_206_204_D_RATIO_BOTTLE_nyhdyg	Atom ratio of given isotopes for dissolved Pb referenced to {NBS981} from bottle samples	unitless	Pb
SD2_Pb_206_204_D_RATIO_BOTTLE_nyhdyg	Two standard deviations of Pb_206_204_D_RATIO_BOTTLE_nyhdyg	unitless	Pb
Flag_Pb_206_204_D_RATIO_BOTTLE_nyhdyg	ODV quality flag for Pb_206_204_D_RATIO_BOTTLE_nyhdyg	unitless	q_flag

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Dataset: GP15 Pb and Pb Isotopes Leg 1