http://lod.bco-dmo.org/id/dataset/718440
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
2017-10-31
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Radium and thorium isotopes measured in the Western Arctic as part of the 2015 US GEOTRACES Arctic Cruise on the USCGC Healy (HLY1502) from August to October 2015
2021-07-06
publication
2021-07-06
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2020-04-07
publication
https://doi.org/10.26008/1912/bco-dmo.718440.3
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. (2021) Radium and thorium isotopes measured in the Western Arctic as part of the 2015 US GEOTRACES Arctic Cruise on the USCGC Healy (HLY1502) from August to October 2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 4) Version Date 2021-07-06 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.718440.4 [access date]
Radium and thorium isotopes measured in the Western Arctic as part of the 2015 US GEOTRACES Arctic Cruise on the USCGC Healy Dataset Description: <p>Radium and thorium isotopes measured in the Western Arctic as part of the 2015 US GEOTRACES Arctic Cruise.&nbsp;</p>
<p><strong>Please contact the PI and Co-PI (Charette and Moore) prior to use of these data in publications.</strong></p> Methods and Sampling: <p><strong>Water column sampling:</strong><br />
Radium and thorium isotopes were collected on manganese-coated cartridges filtered at depth using an adapted McLane in situ pump (WTS-LV). The pumps were programmed to filter 1500-2000L of seawater per deployment. Water (15-25 L) was also collected at the same depth using a 30L Niskin bottle; these samples were filtered (at &lt;1L/min) through a manganese-coated acrylic fiber and used to calculate radium extraction efficiency of the pumped samples. The cartridges were rinsed with radium-free fresh water and excess moisture was removed using compressed air. Samples were analyzed three times using a delayed coincidence counter (RaDeCC) for 223Ra, 224Ra, 228Th, and 227Ac. The cartridge and fiber media were ashed at 820 degrees C and measured on gamma detectors for long lived radium (226Ra, 228Ra) and thorium isotopes. 226Ra was determined via alpha scintillation counting of the Niskin bottle Mn fiber samples.</p>
<p><strong>Surface water sampling:</strong><br />
Surface water radium samples (280 L) were collected from approximately 2 m using a submersible surface pump and filtered through a manganese coated acrylic fiber, which quantitatively scavenges radium from the seawater. Fiber samples were then ashed in a muffle furnace at 820 degrees C for 24 hours and the fiber ash was transferred to polystyrene vials, sealed with epoxy (to prevent 222Rn loss), and counted on high purity, well-type germanium detectors to measure 228Ra, using the lines of 228Ac (338 KeV and 911 KeV), and 226Ra, using the line for 214Pb (352 KeV). Detector efficiencies were determined by measuring ashed fiber standards prepared with a standard solution containing 226Ra and 232Th with daughters in equilibrium.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1458305 Award URL: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1458305
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1458424 Award URL: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1458424
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: 4
Unknown
Cruise_ID
GEOTRC_CASTNO
GEOTRC_INSTR
Station_ID
Start_Date_UTC
Start_Time_UTC
Start_ISO_DateTime_UTC
End_Date_UTC
End_Time_UTC
End_ISO_DateTime_UTC
Start_Latitude
Start_Longitude
End_Latitude
End_Longitude
Event_ID
Sample_ID
Sample_Depth
Ra_226_D_CONC_PUMP_tmldld
SD1_Ra_226_D_CONC_PUMP_tmldld
Flag_Ra_226_D_CONC_PUMP_tmldld
Ra_228_D_CONC_PUMP_5i7kz7
SD1_Ra_228_D_CONC_PUMP_5i7kz7
Flag_Ra_228_D_CONC_PUMP_5i7kz7
Ra_224_D_CONC_PUMP_ryelyc
SD1_Ra_224_D_CONC_PUMP_ryelyc
Flag_Ra_224_D_CONC_PUMP_ryelyc
Ra_224xs_D_CONC_PUMP
Ra_224xs_D_CONC_PUMP_ERR
Ra_224xs_D_CONC_PUMP_FLAG
Ra_223_D_CONC_PUMP_8qp1jk
SD1_Ra_223_D_CONC_PUMP_8qp1jk
Flag_Ra_223_D_CONC_PUMP_8qp1jk
Ra_223xs_D_CONC_PUMP
Ra_223xs_D_CONC_PUMP_ERR
Ra_223xs_D_CONC_PUMP_FLAG
Th_228_D_CONC_PUMP_fejwms
SD1_Th_228_D_CONC_PUMP_fejwms
Flag_Th_228_D_CONC_PUMP_fejwms
30L Niskin bottles
McLane WTS-LV
Radium Delayed Coincidence Counter
Finish Thompson Magnetic Drive pump
theme
None, User defined
cruise id
cast
instrument
station
date
time of day
ISO_DateTime_UTC
latitude
longitude
event
sample identification
depth
radioactive isotope concentration
quality flag
featureType
BCO-DMO Standard Parameters
Niskin bottle
McLane Large Volume Pumping System WTS-LV
Radium Delayed Coincidence Counter
Pump
instrument
BCO-DMO Standard Instruments
HLY1502
service
Deployment Activity
Western Arctic Ocean
place
Locations
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.
U.S. GEOTRACES
http://www.geotraces.org/
U.S. GEOTRACES
GEOTRACES is a SCOR sponsored program; and funding for program infrastructure development is provided by the U.S. National Science Foundation.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.
U.S. GEOTRACES
largerWorkCitation
program
U.S. Arctic GEOTRACES Study (GN01)
https://www.geotraces.org/
U.S. Arctic GEOTRACES Study (GN01)
<p><em>Description from NSF award abstract:</em><br />
In pursuit of its goal "to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions", in 2015 the International GEOTRACES Program will embark on several years of research in the Arctic Ocean. In a region where climate warming and general environmental change are occurring at amazing speed, research such as this is important for understanding the current state of Arctic Ocean geochemistry and for developing predictive capability as the regional ecosystem continues to warm and influence global oceanic and climatic conditions. The three investigators funded on this award, will manage a large team of U.S.scientists who will compete through the regular NSF proposal process to contribute their own unique expertise in marine trace metal, isotopic, and carbon cycle geochemistry to the U.S. effort. The three managers will be responsible for arranging and overseeing at-sea technical services such as hydrographic measurements, nutrient analyses, and around-the-clock management of on-deck sampling activites upon which all participants depend, and for organizing all pre- and post-cruise technical support and scientific meetings. The management team will also lead educational outreach activities for the general public in Nome and Barrow, Alaska, to explain the significance of the study to these communities and to learn from residents' insights on observed changes in the marine system. The project itself will provide for the support and training of a number of pre-doctoral students and post-doctoral researchers. Inasmuch as the Arctic Ocean is an epicenter of global climate change, findings of this study are expected to advance present capability to forecast changes in regional and globlal ecosystem and climate system functioning.</p>
<p>As the United States' contribution to the International GEOTRACES Arctic Ocean initiative, this project will be part of an ongoing multi-national effort to further scientific knowledge about trace elements and isotopes in the world ocean. This U.S. expedition will focus on the western Arctic Ocean in the boreal summer of 2015. The scientific team will consist of the management team funded through this award plus a team of scientists from U.S. academic institutions who will have successfully competed for and received NSF funds for specific science projects in time to participate in the final stages of cruise planning. The cruise track segments will include the Bering Strait, Chukchi shelf, and the deep Canada Basin. Several stations will be designated as so-called super stations for intense study of atmospheric aerosols, sea ice, and sediment chemistry as well as water-column processes. In total, the set of coordinated international expeditions will involve the deployment of ice-capable research ships from 6 nations (US, Canada, Germany, Sweden, UK, and Russia) across different parts of the Arctic Ocean, and application of state-of-the-art methods to unravel the complex dynamics of trace metals and isotopes that are important as oceanographic and biogeochemical tracers in the sea.</p>
U.S. GEOTRACES Arctic
largerWorkCitation
project
Collaborative Research: GEOTRACES Arctic Section: Radium and Thorium Isotopes as Natural Geochemical Tracers in the Arctic Ocean
https://www.bco-dmo.org/project/718522
Collaborative Research: GEOTRACES Arctic Section: Radium and Thorium Isotopes as Natural Geochemical Tracers in the Arctic Ocean
<p><em>NSF Award Abstract:</em><br />
In this project, investigators participating in the 2015 U.S. GEOTRACES Arctic expedition will measure radium and thorium isotopes in the western Arctic Ocean. In common with other national initiatives in the International GEOTRACES Program, the goals of the U.S. Arctic expedition are to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. Some trace elements are essential to life, others are known biological toxins, and still others are important because they can be used as tracers of a variety of physical, chemical, and biological processes in the sea. The radionuclides to be measured as part of this project are important because they are oceanographic tracers that provide information on rates of cycling of other trace elements. The project will involve training opportunities for graduate student researchers and for undergraduate students from under-represented groups. Results from the study will be shared publicly through the Woods Hole Oceanographic Institution's Center for Marine and Environmental Radioactivity.</p>
<p>While other GEOTRACES projects will map the distribution of numerous trace elements and their isotopes (TEIs), their distribution cannot be properly interpreted without concurrent measurement of tracers capable of providing rates of internal TEI cycling processes and fluxes at boundaries and across interfaces. The isotopes to be measured in this project include a suite of uranium/thorium series radionuclides, including the shorter-lived 234-Th and 228-Th as well as the radium quartet (224-Ra, 223-Ra, 228-Ra, 226-Ra). These tracers have the appropriate half-lives and reactivities to allow for study of horizontal and vertical transport and mixing, as well as removal at ocean boundaries, supply via rivers and submarine groundwater discharge, surface scavenging and export and subsurface remineralization. The researchers have considerable experience developing and implementing the most efficient methods to sample and quantify this suite of tracers, which includes use of battery powered in-situ pumps for large volume sampling. Hence, in addition to the proposed work on uranium/thorium series radionuclides, the team will also provide a service to other GEOTRACES researchers by coordinating pump use and sampling for many essential particulate TEIs.</p>
Arctic GEOTRACES Ra Th
largerWorkCitation
project
eng; USA
oceans
Western Arctic Ocean
-180
179.456
60.176
89.992
2015-08-12
2015-10-08
From projects that focused on the following 2 locations: 1. Arctic Ocean; Sailing from Dutch Harbor to Dutch Harbor (GN01) 2. Western Arctic Ocean
0
BCO-DMO catalogue of parameters from Radium and thorium isotopes measured in the Western Arctic as part of the 2015 US GEOTRACES Arctic Cruise on the USCGC Healy (HLY1502) from August to October 2015
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/808292.rdf
Name: Cruise_ID
Units: unitless
Description: GEOTRACES cruise identifier
http://lod.bco-dmo.org/id/dataset-parameter/808293.rdf
Name: GEOTRC_CASTNO
Units: unitless
Description: Cast number
http://lod.bco-dmo.org/id/dataset-parameter/808294.rdf
Name: GEOTRC_INSTR
Units: unitless
Description: Sampling method
http://lod.bco-dmo.org/id/dataset-parameter/808295.rdf
Name: Station_ID
Units: unitless
Description: Station number
http://lod.bco-dmo.org/id/dataset-parameter/808296.rdf
Name: Start_Date_UTC
Units: unitless
Description: Date (UTC) at start of sample collection; format: yyyy-mm-dd
http://lod.bco-dmo.org/id/dataset-parameter/808297.rdf
Name: Start_Time_UTC
Units: unitless
Description: Time (UTC) at start of sample collection; format: HH:MM
http://lod.bco-dmo.org/id/dataset-parameter/808298.rdf
Name: Start_ISO_DateTime_UTC
Units: unitless
Description: Date and time (UTC) at start of sample collection; format: yyyy-mm-ddTHH:MMZ
http://lod.bco-dmo.org/id/dataset-parameter/808299.rdf
Name: End_Date_UTC
Units: unitless
Description: Date (UTC) at end of sample collection; format: yyyy-mm-dd
http://lod.bco-dmo.org/id/dataset-parameter/808300.rdf
Name: End_Time_UTC
Units: unitless
Description: Time (UTC) at end of sample collection; format: HH:MM
http://lod.bco-dmo.org/id/dataset-parameter/808301.rdf
Name: End_ISO_DateTime_UTC
Units: unitless
Description: Date and time (UTC) at end of sample collection; format: yyyy-mm-ddTHH:MMZ
http://lod.bco-dmo.org/id/dataset-parameter/808302.rdf
Name: Start_Latitude
Units: degrees North
Description: Latitude at start of sample collection
http://lod.bco-dmo.org/id/dataset-parameter/808303.rdf
Name: Start_Longitude
Units: degrees East
Description: Longitude at start of sample collection
http://lod.bco-dmo.org/id/dataset-parameter/808304.rdf
Name: End_Latitude
Units: degrees North
Description: Latitude at end of sample collection
http://lod.bco-dmo.org/id/dataset-parameter/808305.rdf
Name: End_Longitude
Units: degrees East
Description: Longitude at end of sample collection
http://lod.bco-dmo.org/id/dataset-parameter/808306.rdf
Name: Event_ID
Units: unitless
Description: Event number
http://lod.bco-dmo.org/id/dataset-parameter/808307.rdf
Name: Sample_ID
Units: unitless
Description: GEOTRACES sample number
http://lod.bco-dmo.org/id/dataset-parameter/808308.rdf
Name: Sample_Depth
Units: meters (m)
Description: Sample depth
http://lod.bco-dmo.org/id/dataset-parameter/808309.rdf
Name: Ra_226_D_CONC_PUMP_tmldld
Units: mBq/kg
Description: Dissolved radium-226 activity
http://lod.bco-dmo.org/id/dataset-parameter/808310.rdf
Name: SD1_Ra_226_D_CONC_PUMP_tmldld
Units: mBq/kg
Description: One standard deviation of Ra_226_D_CONC_PUMP_tmldld
http://lod.bco-dmo.org/id/dataset-parameter/808311.rdf
Name: Flag_Ra_226_D_CONC_PUMP_tmldld
Units: unitless
Description: SeaDataNet quality flag for Ra_226_D_CONC_PUMP_tmldld
http://lod.bco-dmo.org/id/dataset-parameter/808312.rdf
Name: Ra_228_D_CONC_PUMP_5i7kz7
Units: mBq/kg
Description: Dissolved radium-228 activity
http://lod.bco-dmo.org/id/dataset-parameter/808313.rdf
Name: SD1_Ra_228_D_CONC_PUMP_5i7kz7
Units: mBq/kg
Description: One standard deviation of Ra_228_D_CONC_PUMP_5i7kz7
http://lod.bco-dmo.org/id/dataset-parameter/808314.rdf
Name: Flag_Ra_228_D_CONC_PUMP_5i7kz7
Units: unitless
Description: SeaDataNet quality flag for Ra_228_D_CONC_PUMP_5i7kz7
http://lod.bco-dmo.org/id/dataset-parameter/808315.rdf
Name: Ra_224_D_CONC_PUMP_ryelyc
Units: mBq/kg
Description: Dissolved radium-224 activity
http://lod.bco-dmo.org/id/dataset-parameter/808316.rdf
Name: SD1_Ra_224_D_CONC_PUMP_ryelyc
Units: mBq/kg
Description: One standard deviation of Ra_224_D_CONC_PUMP_ryelyc
http://lod.bco-dmo.org/id/dataset-parameter/808317.rdf
Name: Flag_Ra_224_D_CONC_PUMP_ryelyc
Units: unitless
Description: SeaDataNet quality flag for Ra_224_D_CONC_PUMP_ryelyc
http://lod.bco-dmo.org/id/dataset-parameter/808318.rdf
Name: Ra_224xs_D_CONC_PUMP
Units: mBq/kg
Description: Excess dissolved radium-224 activity
http://lod.bco-dmo.org/id/dataset-parameter/808319.rdf
Name: Ra_224xs_D_CONC_PUMP_ERR
Units: mBq/kg
Description: One standard deviation of Ra_224xs_D_CONC_PUMP
http://lod.bco-dmo.org/id/dataset-parameter/808320.rdf
Name: Ra_224xs_D_CONC_PUMP_FLAG
Units: unitless
Description: SeaDataNet quality flag for Ra_224xs_D_CONC_PUMP
http://lod.bco-dmo.org/id/dataset-parameter/808321.rdf
Name: Ra_223_D_CONC_PUMP_8qp1jk
Units: mBq/kg
Description: Dissolved radium-223 activity
http://lod.bco-dmo.org/id/dataset-parameter/808322.rdf
Name: SD1_Ra_223_D_CONC_PUMP_8qp1jk
Units: mBq/kg
Description: One standard deviation of Ra_223_D_CONC_PUMP_8qp1jk
http://lod.bco-dmo.org/id/dataset-parameter/808323.rdf
Name: Flag_Ra_223_D_CONC_PUMP_8qp1jk
Units: unitless
Description: SeaDataNet quality flag for Ra_223_D_CONC_PUMP_8qp1jk
http://lod.bco-dmo.org/id/dataset-parameter/808324.rdf
Name: Ra_223xs_D_CONC_PUMP
Units: mBq/kg
Description: Excess dissolved radium-223 actvitiy
http://lod.bco-dmo.org/id/dataset-parameter/808325.rdf
Name: Ra_223xs_D_CONC_PUMP_ERR
Units: mBq/kg
Description: One standard deviation of Ra_223xs_D_CONC_PUMP
http://lod.bco-dmo.org/id/dataset-parameter/808326.rdf
Name: Ra_223xs_D_CONC_PUMP_FLAG
Units: unitless
Description: SeaDataNet quality flag for Ra_223xs_D_CONC_PUMP
http://lod.bco-dmo.org/id/dataset-parameter/808327.rdf
Name: Th_228_D_CONC_PUMP_fejwms
Units: mBq/kg
Description: Dissolved thorium-228 activity
http://lod.bco-dmo.org/id/dataset-parameter/808328.rdf
Name: SD1_Th_228_D_CONC_PUMP_fejwms
Units: mBq/kg
Description: One standard deviation of Th_228_D_CONC_PUMP_fejwms
http://lod.bco-dmo.org/id/dataset-parameter/808329.rdf
Name: Flag_Th_228_D_CONC_PUMP_fejwms
Units: unitless
Description: SeaDataNet quality flag for Th_228_D_CONC_PUMP_fejwms
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
70819
https://darchive.mblwhoilibrary.org/bitstream/1912/27305/1/dataset-718440_gn01-radium-and-thorium__v4.tsv
download
71157
https://darchive.mblwhoilibrary.org/bitstream/1912/25607/1/dataset-718440_gn01-radium-and-thorium__v3.tsv
download
https://doi.org/10.26008/1912/bco-dmo.718440.3
download
onLine
dataset
<p><strong>Water column sampling:</strong><br />
Radium and thorium isotopes were collected on manganese-coated cartridges filtered at depth using an adapted McLane in situ pump (WTS-LV). The pumps were programmed to filter 1500-2000L of seawater per deployment. Water (15-25 L) was also collected at the same depth using a 30L Niskin bottle; these samples were filtered (at &lt;1L/min) through a manganese-coated acrylic fiber and used to calculate radium extraction efficiency of the pumped samples. The cartridges were rinsed with radium-free fresh water and excess moisture was removed using compressed air. Samples were analyzed three times using a delayed coincidence counter (RaDeCC) for 223Ra, 224Ra, 228Th, and 227Ac. The cartridge and fiber media were ashed at 820 degrees C and measured on gamma detectors for long lived radium (226Ra, 228Ra) and thorium isotopes. 226Ra was determined via alpha scintillation counting of the Niskin bottle Mn fiber samples.</p>
<p><strong>Surface water sampling:</strong><br />
Surface water radium samples (280 L) were collected from approximately 2 m using a submersible surface pump and filtered through a manganese coated acrylic fiber, which quantitatively scavenges radium from the seawater. Fiber samples were then ashed in a muffle furnace at 820 degrees C for 24 hours and the fiber ash was transferred to polystyrene vials, sealed with epoxy (to prevent 222Rn loss), and counted on high purity, well-type germanium detectors to measure 228Ra, using the lines of 228Ac (338 KeV and 911 KeV), and 226Ra, using the line for 214Pb (352 KeV). Detector efficiencies were determined by measuring ashed fiber standards prepared with a standard solution containing 226Ra and 232Th with daughters in equilibrium.</p>
Specified by the Principal Investigator(s)
<p><strong>Data Processing:</strong><br />
The data were corrected for decay from the time of sampling. 223Raxs was corrected for 227Ac, 224Raxs was corrected for 228Th. When possible, total 228Th was used for the 224Raxs correction (total = dissolved + SSF particulate + LSF particulate); for samples collected using the surface pump, only dissolved 228Th was available. The radium activity of the water samples (cartridges) were corrected from the measured radium on acrylic fiber (&lt;1L/min) using the emanation technique.</p>
<p>Data were flagged using the SeaDataNet quality flag scheme. For more information on SeaDataNet flags, see:&nbsp;<a href="https://www.geotraces.org/geotraces-quality-flag-policy/" target="_blank">https://www.geotraces.org/geotraces-quality-flag-policy/</a>&nbsp;and&nbsp;<a href="https://www.seadatanet.org/Standards/Data-Quality-Control" target="_blank">https://www.seadatanet.org/Standards/Data-Quality-Control</a></p>
<p><strong>SeaDataNet quality flag definitions:</strong><br />
0 = No quality control;<br />
1 = Good value;<br />
2 = Probably good value;<br />
3 = Probably bad value;<br />
4 = Bad value;<br />
5 = Changed value;<br />
6 = Value below detection;<br />
7 = Value in excess;<br />
8 = Interpolated value;<br />
9 = Missing value;<br />
A = Value phenomenon uncertain.</p>
<p><strong>Problem report:</strong><br />
Pump failures during sampling resulted in some gaps in data, these samples have been flagged as missing values (quality flag 9). In cases where low volumes (&lt;600L) were filtered due to pump malfunctions, data has been flagged as questionable (quality flag 3). Samples with activities below detection limits have also been flagged (quality flag 6), and no value is reported for those samples.</p>
<p><strong>BCO-DMO Processing:</strong><br />
-&nbsp;replaced blanks (missing data)&nbsp;with "nd"; replaced "ND" with "nd";<br />
- added start and end date/times in ISO 8601 format.<br />
Version history:<br />
- 2019-07-02: replaced version 1 of dataset with version 2 (additional data columns reported; additional columns for units in dpm/L and mBq/kg);<br />
- 2020-04-06: replaced version 2 of dataset with version 3 (GEOTRACES IDP-formatted).<br />
- 2021-07-06:&nbsp;made correction to Sample_Depth for Sample_ID 10509; published as version 4. The depth for 10509 was previously reported as 427, but the correct value is 274.</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
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30L Niskin bottles
30L Niskin bottles
PI Supplied Instrument Name: 30L Niskin bottles PI Supplied Instrument Description:In addition to water collected by pump, water (15-25 L) was also collected using a 30L Niskin bottles. Instrument Name: Niskin bottle Instrument Short Name:Niskin bottle Instrument 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. Community Standard Description: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/
McLane WTS-LV
McLane WTS-LV
PI Supplied Instrument Name: McLane WTS-LV PI Supplied Instrument Description:Water column samples were collected using McLane in situ pumps (McLane WTS-LV). Instrument Name: McLane Large Volume Pumping System WTS-LV Instrument Short Name:WTS-LV Instrument Description: The WTS-LV is a Water Transfer System (WTS) Large Volume (LV) pumping instrument designed and manufactured by McLane Research Labs (Falmouth, MA, USA). It is a large-volume, single-event sampler that collects suspended and dissolved particulate samples in situ.
Ambient water is drawn through a modular filter holder onto a 142-millimeter (mm) membrane without passing through the pump. The standard two-tier filter holder provides prefiltering and size fractioning. Collection targets include chlorophyll maximum, particulate trace metals, and phytoplankton. It features different flow rates and filter porosity to support a range of specimen collection. Sampling can be programmed to start at a scheduled time or begin with a countdown delay. It also features a dynamic pump speed algorithm that adjusts flow to protect the sample as material accumulates on the filter. Several pump options range from 0.5 to 30 liters per minute, with a max volume of 2,500 to 36,000 liters depending on the pump and battery pack used. The standard model is depth rated to 5,500 meters, with a deeper 7,000-meter option available. The operating temperature is -4 to 35 degrees Celsius.
The WTS-LV is available in four different configurations: Standard, Upright, Bore Hole, and Dual Filter Sampler. The high-capacity upright WTS-LV model provides three times the battery life of the standard model. The Bore-Hole WTS-LV is designed to fit through a narrow opening such as a 30-centimeter borehole. The dual filter WTS-LV features two vertical intake 142 mm filter holders to allow simultaneous filtering using two different porosities.
Radium Delayed Coincidence Counter
Radium Delayed Coincidence Counter
PI Supplied Instrument Name: Radium Delayed Coincidence Counter PI Supplied Instrument Description:Samples were analyzed using Radium Delayed Coincidence (RaDeCC) counters and high-purity, well-type germanium detectors. 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.
Finish Thompson Magnetic Drive pump
Finish Thompson Magnetic Drive pump
PI Supplied Instrument Name: Finish Thompson Magnetic Drive pump PI Supplied Instrument Description:Surface samples were collected using a Finish Thompson 1/2 HP Polypropylene 115V Magnetic Drive 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
Cruise: HLY1502
HLY1502
USCGC Healy
Community Standard Description
International Council for the Exploration of the Sea
USCGC Healy
vessel
HLY1502
David C. Kadko
Florida International University
https://datadocs.bco-dmo.org/docs/302/geotraces/GEOTRACES_ARCTIC/data_docs/cruise_reports/healy1502.pdf
Report describing HLY1502
USCGC Healy
Community Standard Description
International Council for the Exploration of the Sea
USCGC Healy
vessel