Dataset: FK190211 Radium Isotopes

Name: Measurements of Radium isotopes (Ra-224 and Ra-223) collected aboard the R/V Falkor cruise FK190211 in the Guaymas Basin of the Gulf of California from February to March 2019.
Published: 2024-04-30
Keywords: Guaymas Basin, Hydrothermal discharge, Radium isotopes, oceans

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Spatial Extent: N:27.583333 E:-108.862033 S:23.956883 W:-111.464667

Guaymas Basin, Gulf of California

Temporal Extent: 2019-02-27 - 2019-03-11

Project:

Collaborative Research: Microbial Carbon cycling and its interactions with Sulfur and Nitrogen transformations in Guaymas Basin hydrothermal sediments (Guaymas Basin Interactions)

Co-Principal Investigator:

Richard N. Peterson (Coastal Carolina University)

Contact:

Richard N. Peterson (Coastal Carolina University)

Version:

Version Date:

2024-04-30

Restricted:

Current State:

Preliminary and in progress

Measurements of Radium isotopes (Ra-224 and Ra-223) collected aboard the R/V Falkor cruise FK190211 in the Guaymas Basin of the Gulf of California from February to March 2019.

Abstract:

During cruise FK190211 aboard the R/V Falkor in the Guaymas Basin within the Gulf of California, water samples were analyzed for short-lived radium isotopes (Ra-224 and Ra-223). This cruise occurred during February-March 2019. The short-lived radium isotopes can be used as an indicator of subsurface fluids discharged into the water column, and when coupled with nutrient and microbial analyses, can yield insight into cycling rates within the water column.

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Methods & Sampling

Water samples for radium isotope analysis were collected from both niskin bottles attached to the CTD rosette (‘C’ designator in data sheet) and from niskin bottles attached to the remotely operated vehicle (ROV). Water samples were filtered through 47 mm GFF filters (unless otherwise noted), then passed slowly through 25 g (dry) acrylic fibers impregnated with MnO2 (Moore, 1976). Fibers were then washed 10x with Ra-free freshwater to remove salts and dried to a mass between 35 and 57 g for optimal humidity levels (Sun and Torgersen, 1998). Fibers were then immediately counted on a Radium Delayed Coincidence Counter (RaDeCC; Moore and Arnold, 1996) for total Ra-224 and Ra-223. Roughly 3 weeks later, fibers were counted again for supported Ra-224. Thus, excess (‘XS’) Ra-224 is the difference between total and supported Ra-224 measurements.

Radium isotopes were analyzed with a Radium Delayed Coincidence Counter (Moore and Arnold, 1996). This system was calibrated to standard MnO2 prepared from NIST-traceable solutions of Th-232 and Ac-227 (with daughters in equilibrium).

Data Processing Description

Data processing was performed in Microsoft Excel.

BCO-DMO Processing

- Modified parameter (column header) names to conform with CSV standards (remove spaces, special characters, etc.)
- Added column for ISO DateTime in UTC
- Converted the submitted Date column to ISO format (i.e., YYYY-MM-DD)
- Added correct hemisphere sign to longitude values (negative sign)
- Created columns for comments to accommodate identification of measurements that were below detection; previously marked as "BD" within numeric isotope observations columns.
- Corrected reference to Gulf of Mexico in dataset abstract to Gulf of California.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1357360

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
FK190211		2019-02-11	R/V Falkor	Samantha B. Joye (Chief Scientist)	data info

Instruments

Niskin bottle

Supplied Description:

Both niskin bottles attached to the CTD rosette (‘C’ designator in data sheet) and from niskin bottles attached to the remotely operated vehicle (ROV) were used to collect samples.

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.

Radium Delayed Coincidence Counter

Supplied Name: Radium Delayed Coincidence Counter (Moore and Arnold, 1996)

Supplied Description:

Radium Delayed Coincidence Counter (Moore and Arnold, 1996). This system was calibrated to standard MnO2 prepared from NIST-traceable solutions of Th-232 and Ac-227 (with daughters in equilibrium).

Instrument Type

Generic Name: Radium Delayed Coincidence Counter

Acronym: RaDeCC

Generic Description:

The RaDeCC is an alpha scintillation counter that distinguishes decay events of short-lived radium daughter products based on their contrasting half-lives. This system was pioneered by Giffin et al. (1963) and adapted for radium measurements by Moore and Arnold (1996).

References:
Giffin, C., A. Kaufman, W.S. Broecker (1963). Delayed coincidence counter for the assay of actinon and thoron. J. Geophys. Res., 68, pp. 1749-1757.
Moore, W.S., R. Arnold (1996). Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter. J. Geophys. Res., 101 (1996), pp. 1321-1329.
Charette, Matthew A.; Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Moore, Willard S.; Scholten, Jan C.; Pham, M. K. (2012). GEOTRACES radium isotopes interlaboratory comparison experiment. Limnology and Oceanography - Methods, vol 10, pg 451.

ROV SuBastian

Supplied Name: ROV

Supplied Description:

Water samples for radium isotope analysis were collected from niskin bottles attached to the remotely operated vehicle (ROV).

Instrument Type

Generic Name: ROV SuBastian

Generic Description:

ROV SuBastian is operated from the research vessel Falkor and the R/V Falkor(too). The ROV is outfitted with a suite of sensors and scientific equipment to support scientific data and sample collection, as well as interactive research, experimentation, and technology development. More information available at https://schmidtocean.org/technology/robotic-platforms/4500-m-remotely-operated-vehicle-rov/

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
C_or_R	CTD or ROV Niskin sample designator	unitless	sample
Station	Station #	unitless	station
Site	Site Name	unitless	site
Date	Local date (EST) sample collected Format: %Y-%m-%d	unitless	date_local
Time	Local time (EST) sample collected Format: %H:%M	unitless	time_local
Latitude	Sampling latitude	decimal degrees	lat
Longitude	Sampling longitude	decimal degrees	lon
Depth	Water depth of sample collection	meters (m)	depth
Sample_Volume	Water sample volume	Liters (l)	sample_volume
Ra223_Activity	Radium-223 activity. Note, minimum detectable activities (dpm/100L) are calculated based on Currie (1968). Any measured values lower than the minimum detectable activity is labeled ‘BD’.	disintegrations per minute per 100 Liters (dpm/100L)	Ra223
Ra223_Activity_Comment	Radium-223 activity comment field where BD = below detection	unitless	comment
Ra223_Unc	1-s analytical uncertainty for Ra223. Any value corresponding to measured values lower than the minimum detectable activity is labeled ‘BD’.	disintegrations per minute per 100 Liters (dpm/100L)	Ra223
Ra223_Unc_Comment	1-s analytical uncertainty for Ra223 comment field where BD = below detection	unitless	comment
XS_Ra224_Activity	Excess radium-224 activity. Note, minimum detectable activities (dpm/100L) are calculated based on Currie (1968). Any measured value lower than the minimum detectable activity is labeled ‘BD’.	disintegrations per minute per 100 Liters (dpm/100L)	Ra224
XS_Ra224_Activity_Comment	Excess radium-224 activity comment field where BD = below detection	unitless	comment
XS_Ra224_Unc	1-s analytical uncertainty for Ra224	disintegrations per minute per 100 Liters (dpm/100L)	Ra224
XS_Ra224_Unc_Comment	1-s analytical uncertainty for Ra225 comment field where BD = below detection	unitless	comment
ISO_DateTime_UTC	Sample date and time in ISO standardized format added by repository Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC

Status message

Database

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Dataset: FK190211 Radium Isotopes