http://lod.bco-dmo.org/id/dataset/988753
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
2025-11-12
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Sediment radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from 2021 to 2024
2026-01-28
publication
2026-01-28
revision
Woods Hole Oceanographic Institution (WHOI BCO-DMO)
2026-04-02
publication
https://doi.org/10.26008/1912/bco-dmo.988753.1
Madeline Healey
Dalhousie University
principalInvestigator
Stephanie S. Kienast
Dalhousie University
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: Healey, M., Kienast, S. S. (2026) Sediment radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from 2021 to 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-01-28 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.988753.1 [access date]
Bedford Basin 2021-2024 Sediment 234Th Dataset Description: This dataset has been published "as is". Final review by the data submitter was not received after the data were imported into the BCO-DMO data system. Methods and Sampling: <p>Samples were collected at Compass Station in the Bedford Basin, Halifax, Nova Scotia, Canada (44.7 N, -63.6 W) on day-trips aboard Connor's Diving Ltd, vessel EASTCOM in May 2021, January 2022, May 2023, August 2023, and January 2024.</p>
<p>For the measurement of 234Th in the sediment, a KC Denmark Multicorer was deployed at the Compass Station following water column sampling. Sediments were processed either the same day of retrieval or stored at 4 degrees Celsius (°C) for 24 to 48 hours prior to processing. Cores were sliced into 0.5–1 centimeter (cm) thick sections and then dried at 55°C for approximately 24 hours. After this period, they were weighed and returned to the oven and reweighed at regular intervals until a constant weight was achieved. To correct for residual salt content, salt contribution from porewater was estimated from the salinity of the overlying water and subtracted from the measured dry weight. Once dry, sediments were manually homogenized and weighed into a petri dish. Analysis of sedimentary 234Th and 238U activities were carried out by non-destructive gamma counting on High-Purity Germanium (HPGe) detectors (Dartmouth College, USA) with ~ 15 grams (g) of sediment. The raw 234Th activities (at 63.3 kiloelectron volts (keV)) in sediments were decay corrected to time of collection. Unsupported or 'excess' 234Th is 234Th that is not in secular equilibrium with the 238U parent present in the uppermost sediments, presumably because it was supplied by settling particles.</p>
Funding provided by National Sciences and Engineering Research Council of Canada (NSERC) Award Number: 2018-05607 Award URL: https://nserc-crsng.canada.ca/en/awards-database/713748
completed
Madeline Healey
Dalhousie University
mhealey@dal.ca
pointOfContact
Stephanie S. Kienast
Dalhousie University
Stephanie.Kienast@dal.ca
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Sampling_Date
Latitude
Longitude
Layer_Start
Layer_End
Mid_Layer
Raw_234Th
Unc_Raw_234Th
Decay_corr_234Th
Unc_Decay_corr_234Th
Thxs234
Unc_234Thxs
High-Purity Germanium (HPGe) detectors
KC Denmark - Multicorer
theme
None, User defined
date
latitude
longitude
depth core
thorium-234 activity
featureType
BCO-DMO Standard Parameters
Germanium detector
Multi Corer
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.
Ocean Frontier Institute Seed Fund Grant: Bedford Basin 2019
https://osprey.bco-dmo.org/project/889453
Ocean Frontier Institute Seed Fund Grant: Bedford Basin 2019
<p>In coastal regions, the transport of carbon from surface waters to the seafloor is a key mechanism of carbon burial and it has been suggested that one-fifth of the carbon entering coastal areas off of eastern North America (from the atmosphere and through rivers) is subsequently buried in these coastal areas (Najjar et al., 2018). However, direct measurements coupling carbon fluxes in coastal waters to accumulation in sediment remains a challenge.</p>
<p>Bedford Basin is a well-studied coastal system in Nova Scotia, Canada (<a href="https://www.bio.gc.ca/science/monitoring-monitorage/bbmp-pobb/bbmp-pobb-en.php" target="_blank">Bedford Basin Monitoring Program</a>) that can provide unique insight into carbon cycling in these shallow marine regions. To quantify sinking particulate carbon and benthic-pelagic carbon cycling, and to examine the potential factors influencing coastal carbon budgets, carbon content and radioisotope (i.e., Thorium-234) measurements were collected at the Compass Station in Bedford Basin at four time periods (February to August 2019). Sediment cores and seawater samples were analyzed. Size fractionated filtration was performed to examine differences in 'sinking' (>51 micrometers) and 'suspended' (1-51 micrometers) particulate organic carbon and Thorium-234.</p>
<p>References Cited:<br />
Najjar, R. G., et al. (2018). Carbon Budget of Tidal Wetlands, Estuaries, and Shelf Waters of Eastern North America. In Global Biogeochemical Cycles (Vol. 32, Issue 3, pp. 389–416). American Geophysical Union (AGU). <a href="https://doi.org/10.1002/2017gb005790" target="_blank">https://doi.org/10.1002/2017gb005790</a></p>
Bedford Basin 2019
largerWorkCitation
project
eng; USA
oceans
-63.642
-63.642
44.692
44.692
2021-05-01
2024-01-31
Compass Station in Bedford Basin, Nova Scotia, Canada
0
BCO-DMO catalogue of parameters from Sediment radioisotope (234Th) and carbon from sampling conducted at the Compass Station in Bedford Basin, Nova Scotia, Canada from 2021 to 2024
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/993073.rdf
Name: Sampling_Date
Units: unitless
Description: <p>Date of sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/993074.rdf
Name: Latitude
Units: decimal degrees
Description: <p>latitude where samples were collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/993075.rdf
Name: Longitude
Units: decimal degrees
Description: <p>longitude where samples were collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/993076.rdf
Name: Layer_Start
Units: centimeters
Description: <p>Upper boundary (shallower depth) of the sampled layer</p>
http://lod.bco-dmo.org/id/dataset-parameter/993077.rdf
Name: Layer_End
Units: centimeters
Description: <p>Lower boundary (deeper depth) of the sampled layer</p>
http://lod.bco-dmo.org/id/dataset-parameter/993078.rdf
Name: Mid_Layer
Units: centimeters
Description: <p>Midpoint depth of the sampled interval</p>
http://lod.bco-dmo.org/id/dataset-parameter/993079.rdf
Name: Raw_234Th
Units: decays per minute per gram (dpm/g)
Description: <p>Measured (uncorrected) 234Th activity in the sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/993080.rdf
Name: Unc_Raw_234Th
Units: decays per minute per gram (dpm/g)
Description: <p>Analytical uncertainty associated with Raw_234Th</p>
http://lod.bco-dmo.org/id/dataset-parameter/993081.rdf
Name: Decay_corr_234Th
Units: decays per minute per gram (dpm/g)
Description: <p>234Th activity corrected for radioactive decay between collection and counting</p>
http://lod.bco-dmo.org/id/dataset-parameter/993082.rdf
Name: Unc_Decay_corr_234Th
Units: decays per minute per gram (dpm/g)
Description: <p>Analytical uncertainty on decay-corrected 234Th</p>
http://lod.bco-dmo.org/id/dataset-parameter/993083.rdf
Name: Thxs234
Units: decays per minute per gram (dpm/g)
Description: <p>Excess (unsupported) 234Th activity</p>
http://lod.bco-dmo.org/id/dataset-parameter/993084.rdf
Name: Unc_234Thxs
Units: decays per minute per gram (dpm/g)
Description: <p>Analytical uncertainty (1?) associated with 234Thxs</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
https://doi.org/10.26008/1912/bco-dmo.988753.1
download
onLine
dataset
<p>Samples were collected at Compass Station in the Bedford Basin, Halifax, Nova Scotia, Canada (44.7 N, -63.6 W) on day-trips aboard Connor's Diving Ltd, vessel EASTCOM in May 2021, January 2022, May 2023, August 2023, and January 2024.</p>
<p>For the measurement of 234Th in the sediment, a KC Denmark Multicorer was deployed at the Compass Station following water column sampling. Sediments were processed either the same day of retrieval or stored at 4 degrees Celsius (°C) for 24 to 48 hours prior to processing. Cores were sliced into 0.5–1 centimeter (cm) thick sections and then dried at 55°C for approximately 24 hours. After this period, they were weighed and returned to the oven and reweighed at regular intervals until a constant weight was achieved. To correct for residual salt content, salt contribution from porewater was estimated from the salinity of the overlying water and subtracted from the measured dry weight. Once dry, sediments were manually homogenized and weighed into a petri dish. Analysis of sedimentary 234Th and 238U activities were carried out by non-destructive gamma counting on High-Purity Germanium (HPGe) detectors (Dartmouth College, USA) with ~ 15 grams (g) of sediment. The raw 234Th activities (at 63.3 kiloelectron volts (keV)) in sediments were decay corrected to time of collection. Unsupported or 'excess' 234Th is 234Th that is not in secular equilibrium with the 238U parent present in the uppermost sediments, presumably because it was supplied by settling particles.</p>
Specified by the Principal Investigator(s)
- Imported original file "BB_2021_2024_Sediments.csv" into the BCO-DMO system.
- Renamed fields to comply with BCO-DMO naming conventions.
- Converted date format to YYYY-MM.
- Saved the final file as "988753_v1_bedford_basin_sediment_th_2021-2024.csv".
- This dataset has been published "as is". Final review by the data submitter was not received after the data were imported into the BCO-DMO data system.
Specified by BCO-DMO Data Managers
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
High-Purity Germanium (HPGe) detectors
High-Purity Germanium (HPGe) detectors
PI Supplied Instrument Name: High-Purity Germanium (HPGe) detectors PI Supplied Instrument Description:Analysis of sedimentary 234Th and 238U activities were carried out by non-destructive gamma counting on High-Purity Germanium (HPGe) detectors (Dartmouth College, USA) with ~ 15 g of sediment Instrument Name: Germanium detector Instrument Short Name: Instrument Description: Germanium detectors are semiconductor diodes having a p-i-n structure in which the intrinsic (i) region is sensitive to ionizing radiation, particularly x rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region. When photons interact with the material within the depleted volume of a detector, charge carriers (holes and electrons) are produced and are swept by the electric field to the p and n electrodes. This charge, which is in proportion to the energy deposited in the detector by the incoming photon, is converted into a voltage pulse by an integral charge sensitive preamplifier. Germanium detectors are mostly used for gamma spectroscopy in nuclear physics, as well as x-ray spectroscopy.
KC Denmark - Multicorer
KC Denmark - Multicorer
PI Supplied Instrument Name: KC Denmark - Multicorer PI Supplied Instrument Description:Equipped with four 60 cm long, 10 cm internal diameter core barrels made of polycarbonate Instrument Name: Multi Corer Instrument Short Name:Multi Corer Instrument Description: The Multi Corer is a benthic coring device used to collect multiple, simultaneous, undisturbed sediment/water samples from the seafloor. Multiple coring tubes with varying sampling capacity depending on tube dimensions are mounted in a frame designed to sample the deep ocean seafloor. For more information, see Barnett et al. (1984) in Oceanologica Acta, 7, pp. 399-408. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/51/