http://lod.bco-dmo.org/id/dataset/878519
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2022-08-12
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Measurements of global dissolved submarine groundwater discharge (SGD) 226-Radium and 228-Radium
2022-08-16
publication
2022-08-16
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2022-08-17
publication
https://doi.org/10.26008/1912/bco-dmo.878519.1
Matthew A. Charette
Woods Hole Oceanographic Institution
principalInvestigator
Willard S. Moore
University of South Carolina
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Charette, M. A., Moore, W. S. (2022) Measurements of global dissolved submarine groundwater discharge (SGD) 226-Radium and 228-Radium. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-08-16 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.878519.1 [access date]
Global SGD 226Ra and 228Ra Dataset Description: Methods and Sampling: <p>Samples were collected using either a peristaltic pump or a well pump and the groundwater was passed through a 1 or 5 μm prefilter to remove suspended sediment before being filtered at &lt;1 L/min onto Mn-coated acrylic fiber. The fiber was rinsed with Ra-free MilliQ water to remove any salts or sediment, then partially dried.</p>
<p>Samples with low activities (&lt;0.4 dpm) were analyzed for 228Ra via 228Th ingrowth using a delayed coincidence counter (RaDeCC) (Moore, 2008), as described in Charette et al. (2015). Briefly, when 228Ra is extracted onto the Mn fiber, 228Th is extracted in parallel. Using the initial concentration of 228Th and the concentration of 228Th after 1 to 2 years, measured via RaDeCC, along with the decay constants of 228Th and 228Ra, the initial concentration of 228Ra can be calculated. Low activity samples were analyzed for 226Ra via 222Rn emanation (Key et al. 1979), as described in Charette et al. (2015). Fibers were placed in a fiber holder that was then flushed with He for 5 minutes at 250 mL/min, sealed, and left for two weeks before analysis via 222Rn ingrowth and scintillation counting. These two methods were used for low activity samples due to better method sensitivity than gamma counting (Charette et al., 2001), which was used for samples with high activities (&gt;0.4 dpm per sample). For this method, the fibers were ashed (880 °C, 16 h), homogenized, capped with epoxy resin, and left for &gt;3 weeks to obtain secular equilibrium between 226Ra and its daughter radionuclides. The samples were then counted in a well-type gamma spectrometer for 228Ra (via 228Ac at 338 keV) and 226Ra (via 214Pb at 351.9 keV) (Charette et al., 2001).</p>
<p>When not specifically listed, errors are 10%.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1736277 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1736277
completed
Matthew A. Charette
Woods Hole Oceanographic Institution
508-289-3205
Marine Chemistry & Geochemistry Clark 439, MS#25
Woods Hole
MA
02543
USA
mcharette@whoi.edu
pointOfContact
Willard S. Moore
University of South Carolina
Department of Earth & Ocean Sciences EWS 617, 701 Sumter St.
Columbia
SC
29208
USA
moore@geol.sc.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Source
Site
Date
Longitude
Latitude
Salinity
Ra226
Ra228
Ra224
Ra223
ratio_228Ra_to_226Ra
ratio_avg228Ra_to_avg226Ra
ratio_med228Ra_to_med226Ra
well-type gamma spectrometer
peristaltic pump or well pump
RaDeCC
theme
None, User defined
site
date
longitude
latitude
salinity
radium-226
radium-228
radium-224
radium-223
radioactive isotope concentration
featureType
BCO-DMO Standard Parameters
Gamma Ray Spectrometer
Pump
Radium Delayed Coincidence Counter
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Collaborative Research: US GEOTRACES PMT: Sources and Rates of Trace Element and Isotope Cycling Derived from the Radium Quartet
https://osprey.bco-dmo.org/project/825868
Collaborative Research: US GEOTRACES PMT: Sources and Rates of Trace Element and Isotope Cycling Derived from the Radium Quartet
<p><em>NSF Award Abstract:</em><br />
The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. Naturally occurring radioactive isotopes of the element radium can be used to measure the rates of important processes in the ocean. In turn, making these rate measurements at the same time as other trace element and isotope data are collected enables a more complete interpretation of these data. The investigators propose to measure the four isotopes of radium -- Ra-223, Ra-224, Ra-226, and Ra-228 -- on a U.S. GEOTRACES expedition from Alaska to Tahiti in 2018. The radium isotope data will be particularly useful in investigating trace element input and removal processes associated with ocean boundaries (rivers, continental shelves, and the ocean bottom) and with mid-ocean ridge hydrothermal vents and the long-range dispersal of their neutrally buoyant plumes. The investigators will also investigate the processes controlling the internal cycling of the longest-lived isotope, Ra-226, compared to the element barium, which has a very similar chemistry to radium.<br />
<br />
The proposed work would address a number of key questions regarding trace element inputs from ocean boundaries and their potential impact on ocean productivity and biogeochemistry. As iron is an important nutrient for marine phytoplankton, the investigators will quantify the rates of lateral trace element transport from the Gulf of Alaska margin out to and including the offshore High Nutrient Low Chlorophyll region of the subarctic Northeast Pacific Ocean. In the ocean subsurface, they will seek to understand the trace element fluxes associated with high temperature hydrothermal venting, and the rate at which trace elements and isotopes are removed via scavenging along the hydrothermal plume. Lastly, the work will lead to an improved understanding of a marine carbonate sediment dating technique via an investigation of Ra-226 and barium fractionation processes in the upper ocean. The project will involve collaboration between two U.S. institutions and a partner in France who will analyze some of the samples. Two graduate students will participate in the project. Moore will supervise an undergraduate student through the South Carolina Alliance for Minority Participation, and will encourage this student to develop a senior thesis based on their participation in this project.</p>
PMT Radium Isotopes
largerWorkCitation
project
eng; USA
oceans
-69.63428
32.678
-52.64855
48.10041
1993-10-24
2016-08-17
0
BCO-DMO catalogue of parameters from Measurements of global dissolved submarine groundwater discharge (SGD) 226-Radium and 228-Radium
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/878569.rdf
Name: Source
Units: unitless
Description: <p>sample location/source; see Supplemental File "SGD_Database_Sources.pdf" for complete citations of papers referred to in this column.</p>
http://lod.bco-dmo.org/id/dataset-parameter/878570.rdf
Name: Site
Units: unitless
Description: <p>Sample ID; site name; reference</p>
http://lod.bco-dmo.org/id/dataset-parameter/878571.rdf
Name: Date
Units: unitless
Description: <p>Date sampled (local time); most values are in format YYYY-MM-DD</p>
http://lod.bco-dmo.org/id/dataset-parameter/878572.rdf
Name: Longitude
Units: decimal degrees North
Description: <p>Longitude of sample site</p>
http://lod.bco-dmo.org/id/dataset-parameter/878573.rdf
Name: Latitude
Units: decimal degrees East
Description: <p>Latitude of sample site</p>
http://lod.bco-dmo.org/id/dataset-parameter/878574.rdf
Name: Salinity
Units: ppt
Description: <p>Salinity when sampled</p>
http://lod.bco-dmo.org/id/dataset-parameter/878575.rdf
Name: Ra226
Units: dpm/L
Description: <p>226Ra isotope concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/878576.rdf
Name: Ra228
Units: dpm/L
Description: <p>228Ra isotope concentration. "BDL" = "below detection limit. 0.4 dpm/100L is the detection limit for 228Ra for this dataset.</p>
http://lod.bco-dmo.org/id/dataset-parameter/878577.rdf
Name: Ra224
Units: dpm/L
Description: <p>224Ra isotope concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/878578.rdf
Name: Ra223
Units: dpm/L
Description: <p>223Ra isotope concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/878579.rdf
Name: ratio_228Ra_to_226Ra
Units: unitless
Description: <p>sample activity ratio (228/226)</p>
http://lod.bco-dmo.org/id/dataset-parameter/878580.rdf
Name: ratio_avg228Ra_to_avg226Ra
Units: unitless
Description: <p>average site AR (228/226)</p>
http://lod.bco-dmo.org/id/dataset-parameter/878581.rdf
Name: ratio_med228Ra_to_med226Ra
Units: unitless
Description: <p>median site AR (228/226</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
77925
https://darchive.mblwhoilibrary.org/bitstream/1912/29226/1/dataset-878519_global-sgd-226ra-and-228ra__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.878519.1
download
onLine
dataset
<p>Samples were collected using either a peristaltic pump or a well pump and the groundwater was passed through a 1 or 5 μm prefilter to remove suspended sediment before being filtered at &lt;1 L/min onto Mn-coated acrylic fiber. The fiber was rinsed with Ra-free MilliQ water to remove any salts or sediment, then partially dried.</p>
<p>Samples with low activities (&lt;0.4 dpm) were analyzed for 228Ra via 228Th ingrowth using a delayed coincidence counter (RaDeCC) (Moore, 2008), as described in Charette et al. (2015). Briefly, when 228Ra is extracted onto the Mn fiber, 228Th is extracted in parallel. Using the initial concentration of 228Th and the concentration of 228Th after 1 to 2 years, measured via RaDeCC, along with the decay constants of 228Th and 228Ra, the initial concentration of 228Ra can be calculated. Low activity samples were analyzed for 226Ra via 222Rn emanation (Key et al. 1979), as described in Charette et al. (2015). Fibers were placed in a fiber holder that was then flushed with He for 5 minutes at 250 mL/min, sealed, and left for two weeks before analysis via 222Rn ingrowth and scintillation counting. These two methods were used for low activity samples due to better method sensitivity than gamma counting (Charette et al., 2001), which was used for samples with high activities (&gt;0.4 dpm per sample). For this method, the fibers were ashed (880 °C, 16 h), homogenized, capped with epoxy resin, and left for &gt;3 weeks to obtain secular equilibrium between 226Ra and its daughter radionuclides. The samples were then counted in a well-type gamma spectrometer for 228Ra (via 228Ac at 338 keV) and 226Ra (via 214Pb at 351.9 keV) (Charette et al., 2001).</p>
<p>When not specifically listed, errors are 10%.</p>
Specified by the Principal Investigator(s)
<p><strong>BCO-DMO Processing:</strong><br />
- renamed fields to comply with BCO-DMO naming conventions;<br />
- removed commas and apostrophes from data values;<br />
- re-organized original spreadsheet, moving sub-headings into the 'Source'&nbsp;column.</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
well-type gamma spectrometer
well-type gamma spectrometer
PI Supplied Instrument Name: well-type gamma spectrometer PI Supplied Instrument Description:Gamma detectors made by Canberra or Ortec. Instrument Name: Gamma Ray Spectrometer Instrument Short Name: Instrument Description: Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.
peristaltic pump or well pump
peristaltic pump or well pump
PI Supplied Instrument Name: peristaltic pump or well pump Instrument Name: Pump Instrument Short Name: Instrument Description: A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps
RaDeCC
RaDeCC
PI Supplied Instrument Name: RaDeCC PI Supplied Instrument Description:RaDeCCs made by Scientific Computer Instruments Instrument Name: Radium Delayed Coincidence Counter Instrument Short Name:RaDeCC Instrument 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.