http://lod.bco-dmo.org/id/dataset/871002
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
2022-03-10
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Radium and thorium radionuclide measurements in coastal marsh sediments from sediment cores in South Carolina collected from 2017 to 2019
2022-03-10
publication
2022-03-10
revision
BCO-DMO Linked Data URI
2022-03-10
creation
http://lod.bco-dmo.org/id/dataset/871002
Timothy Shaw
University of South Carolina
principalInvestigator
Madeleine Bodine
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: Shaw, T., Bodine, M. (2022) Radium and thorium radionuclide measurements in coastal marsh sediments from sediment cores in South Carolina collected from 2017 to 2019. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-03-10 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/871002 [access date]
Methods and Sampling: <p><strong>Sampling and analytical procedures:&nbsp;</strong></p>
<p>Sediment cores were collected with the piston corer and immediately cut at 2-6 cm intervals and transferred to Teflon large mouth bottles. Care was taken to minimize settling of cores or loss of pore water prior to sectioning. A portion of approximately 15 grams was taken from each bottle and was charged with 150 ml of 18 Mohm water and stirred to form a slurry. The slurry was sonicated for 5 min. The pH of the slurry was adjusted to 8-9 by the dropwise addition of concentrated NH<sub>4</sub>OH. Following the pH adjustment, 1.0 ml of KMnO<sub>4</sub> solution (3.0 g l<sup>-1</sup>) and 1.0 ml of MnCl<sub>2</sub> solution (8.0 g MnCl<sub>2 </sub>4H<sub>2</sub>O l<sup>-1</sup>) was added to form a suspension of MnO<sub>2</sub>. The slurry was then filtered onto a 142 mm GF/F filter. The sample was loaded into a modified recirculation chamber (after Cai et al. 2012) for counting of <sup>220</sup>Rn and <sup>219</sup>Rn on the RaDeCC system.&nbsp; Samples were taken back to the laboratory for immediate counting to minimize error in the ratio. Samples were re-measured in the same RaDeCC system after two days and 45 days to differentiate between supported and excess <sup>224</sup>Ra and <sup>223</sup>Ra.</p>
<p>To estimate porosity, after the sample was collected and split into representative slabs, a portion of the homogenized slab (typically 15 grams) was dried to constant mass using an oven at 60℃. Mass measurements were taken until constant mass was achieved.&nbsp;&nbsp;</p>
<p><strong>Problem Report:</strong><br />
Noted in the data file, there were four samples that had anomalous counts. These counts were excluded from the data set and results recalculated. Both the original data calculation and the recalculation have been included in the data set. The recalculated samples are denoted with CORR at the end of the sample name and commented on.&nbsp;<br />
<br />
<strong>Location:&nbsp;</strong><br />
Folly Island and Marsh, South Carolina, 32.68 N, 79.95 W<br />
Daniel Island creek/marsh, South Carolina 32.89 N, 79.9 W</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1559274 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1559274
onGoing
Timothy Shaw
University of South Carolina
803-777-0352
631 Sumter Street
Columbia
SC
29208-0001
USA
shaw@mail.chem.sc.edu
pointOfContact
Madeleine Bodine
University of South Carolina
mbodine@email.sc.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Core_Section
Year_Collection
Date_Collection
Time_EST_EDT
Date_Time_UTC
Tide_Description
Latitude_decimal
Longitude_Decimal
Core_condition_Observations
Porosity
Ra224
Error_Ra224
Th228
Error_Th228
Water_Flux
Comments
theme
None, User defined
core id
year
date_local
time_local
ISO_DateTime_UTC
site description
latitude
longitude
sample description
sediment porosity
radioactive isotope concentration
flux
comments
featureType
BCO-DMO Standard Parameters
Push Corer
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.
A New Method for Assessing the Magnitude and Impact of Shallow Seawater/Pore water Exchange in Salt Marsh Systems
https://osprey.bco-dmo.org/project/842600
A New Method for Assessing the Magnitude and Impact of Shallow Seawater/Pore water Exchange in Salt Marsh Systems
<p><strong>NSF Award Abstract:</strong><br />
Tidal marshes are critical junctions between marine and terrestrial chemical processes. The chemical and physical processes that tidal marsh sediments undergo determine the nature of the transformation and accumulation of particulate organic carbon (POC) at the marine to terrestrial interface. Physical transport of pore water through marsh sediments greatly influences the availability of carbon and nutrients that can undergo transformative reactions at the marine to terrestrial interface. Past studies have shown that there is a discrepancy between predicted rates of pore water flow and calculated estimates from tracer studies. Because this flow is crucial to the chemistry of sediment at the terrestrial to marine interface, which is the first junction of the chemical species exported to the ocean, it is important to explain the discrepancy between expected rates of flow and observed rates. This study will use a known tracer method based on natural isotopic ratios (224Radon/228Thorium) and will develop a new method (223Radon/ 227Actinium) to evaluate the export of POC due to pore water flow in tidal marsh sediments, which will have much broader impacts to the overall marine carbon budget. Results from this work will also be integrated into workshops that will educate students and teachers from outside of oceanography about oceanographic carbon and climate research. Presentations will also be developed in collaboration with the South Carolina State Museum as part of the Science Café series. Additionally, one graduate student and one undergraduate student will be supported by this funding.</p>
<p>Predicted advection rates of pore water in very fine-grained tidal marsh sediments have been shown to significantly differ from rates calculated using tracer studies. Because tidal marshes are a crucial chemical link at the marine terrestrial interface, and advection has a significant impact on the availability of chemical species to undergo diagenetic reactions at this interface, it is of significant importance to evaluate this discrepancy. Export of particulate organic carbon (POC) and dissolved organic carbon (DIC), in particular, are of interest, due to the impact on microbial communities within sediments. This research aims to validate the method of 224Ra/228Th disequilibrium to calculate pore water exchange rates. Previous studies using this method have provided evidence for more rapid pore water exchange than would generally be expected in such fine-grained sediments, which are less permeable than coarser grained sediment. Additionally, this research will attempt to develop the disequilibrium method for 223Ra/227Ac. The researchers will evaluate the impact of advection rates on the export of chemical species in salt marshes.</p>
Salt Marsh Water Exchange
largerWorkCitation
project
eng; USA
oceans
-79.9531
-79.9086
32.6903
32.8948
2017-05-31
2019-09-27
0
BCO-DMO catalogue of parameters from Radium and thorium radionuclide measurements in coastal marsh sediments from sediment cores in South Carolina collected from 2017 to 2019
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/871034.rdf
Name: Core_Section
Units: Centimeters cm, in leading number of core section name
Description: <p>Name of core, leading number represents lowest depth from surface. C# represents core number taken that month, ##1# denotes the month and year.</p>
http://lod.bco-dmo.org/id/dataset-parameter/871035.rdf
Name: Year_Collection
Units: Years
Description: <p>Year sample was collected in format YYYY</p>
http://lod.bco-dmo.org/id/dataset-parameter/871036.rdf
Name: Date_Collection
Units: unitless
Description: <p>Date (EST/EDT) sample was collected in format MM-DD-YY</p>
http://lod.bco-dmo.org/id/dataset-parameter/871037.rdf
Name: Time_EST_EDT
Units: unitless
Description: <p>Time (EST/EDT) sample was collected in format hh:mm</p>
http://lod.bco-dmo.org/id/dataset-parameter/871038.rdf
Name: Date_Time_UTC
Units: unitless
Description: <p>Date and time of collection (UTC) in ISO 8601 format YYYY-MM-DDThh:mmZ</p>
http://lod.bco-dmo.org/id/dataset-parameter/871039.rdf
Name: Tide_Description
Units: unitless
Description: <p>State of tide when sample was taken, includes time of relevant tide if applicable in format hh:mm(EST/EDT)</p>
http://lod.bco-dmo.org/id/dataset-parameter/871040.rdf
Name: Latitude_decimal
Units: decimal degrees
Description: <p>Latitude of sample location</p>
http://lod.bco-dmo.org/id/dataset-parameter/871041.rdf
Name: Longitude_Decimal
Units: decimal degrees
Description: <p>Longitude of sample location</p>
http://lod.bco-dmo.org/id/dataset-parameter/871042.rdf
Name: Core_condition_Observations
Units: unitless
Description: <p>Brief description of core content</p>
http://lod.bco-dmo.org/id/dataset-parameter/871043.rdf
Name: Porosity
Units: Unitless
Description: <p>Ratio of water content to sediment by weight (grams/grams)</p>
http://lod.bco-dmo.org/id/dataset-parameter/871044.rdf
Name: Ra224
Units: Decays per minute per gram (dpm/g)
Description: <p>Radium 224 measured</p>
http://lod.bco-dmo.org/id/dataset-parameter/871045.rdf
Name: Error_Ra224
Units: Decays per minute per gram (dpm/g)
Description: <p>Error in measured 224 Radium</p>
http://lod.bco-dmo.org/id/dataset-parameter/871046.rdf
Name: Th228
Units: Decays per minute per gram (dpm/g)
Description: <p>Thorium 228 measured</p>
http://lod.bco-dmo.org/id/dataset-parameter/871047.rdf
Name: Error_Th228
Units: Decays per minute per gram (dpm/g)
Description: <p>Error in Thorium 228 measured</p>
http://lod.bco-dmo.org/id/dataset-parameter/871048.rdf
Name: Water_Flux
Units: Liters per meter squared per day
Description: <p>Calculated water flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/871049.rdf
Name: Comments
Units: unitless
Description: <p>Comments on counting errors</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://osprey.bco-dmo.org/dataset/871002/data/download
download
onLine
dataset
<p><strong>Sampling and analytical procedures:&nbsp;</strong></p>
<p>Sediment cores were collected with the piston corer and immediately cut at 2-6 cm intervals and transferred to Teflon large mouth bottles. Care was taken to minimize settling of cores or loss of pore water prior to sectioning. A portion of approximately 15 grams was taken from each bottle and was charged with 150 ml of 18 Mohm water and stirred to form a slurry. The slurry was sonicated for 5 min. The pH of the slurry was adjusted to 8-9 by the dropwise addition of concentrated NH<sub>4</sub>OH. Following the pH adjustment, 1.0 ml of KMnO<sub>4</sub> solution (3.0 g l<sup>-1</sup>) and 1.0 ml of MnCl<sub>2</sub> solution (8.0 g MnCl<sub>2 </sub>4H<sub>2</sub>O l<sup>-1</sup>) was added to form a suspension of MnO<sub>2</sub>. The slurry was then filtered onto a 142 mm GF/F filter. The sample was loaded into a modified recirculation chamber (after Cai et al. 2012) for counting of <sup>220</sup>Rn and <sup>219</sup>Rn on the RaDeCC system.&nbsp; Samples were taken back to the laboratory for immediate counting to minimize error in the ratio. Samples were re-measured in the same RaDeCC system after two days and 45 days to differentiate between supported and excess <sup>224</sup>Ra and <sup>223</sup>Ra.</p>
<p>To estimate porosity, after the sample was collected and split into representative slabs, a portion of the homogenized slab (typically 15 grams) was dried to constant mass using an oven at 60℃. Mass measurements were taken until constant mass was achieved.&nbsp;&nbsp;</p>
<p><strong>Problem Report:</strong><br />
Noted in the data file, there were four samples that had anomalous counts. These counts were excluded from the data set and results recalculated. Both the original data calculation and the recalculation have been included in the data set. The recalculated samples are denoted with CORR at the end of the sample name and commented on.&nbsp;<br />
<br />
<strong>Location:&nbsp;</strong><br />
Folly Island and Marsh, South Carolina, 32.68 N, 79.95 W<br />
Daniel Island creek/marsh, South Carolina 32.89 N, 79.9 W</p>
Specified by the Principal Investigator(s)
<p>Data from the RaDeCC were in text files. The relevant numbers from the raw data are transferred to Excel spreadsheets where calculations (including decay, coincidence counts, error) are performed to obtain final results.</p>
<p>Excel version: Microsoft® Excel® for Microsoft 365 MSO (Version 2111 Build 16.0.14701.20254) 64-bit&nbsp; &nbsp;</p>
<div>BCO-DMO Data Manager Processing Notes:<br />
* Data from source file&nbsp;DATASET_Cores.docx Sheet1&nbsp;were imported into the BCO-DMO data system and combined into one data table.&nbsp; &nbsp;<br />
* Parameters (column names) renamed to comply with BCO-DMO naming conventions. See <a href="https://www.bco-dmo.org/page/bco-dmo-data-processing-conventions">https://www.bco-dmo.org/page/bco-dmo-data-processing-conventions</a><br />
* Date_Time_UTC&nbsp;column converted to ISO 8601 format yyyy-mm-ddTHH:MMZ&nbsp;<br />
* latitude and longitude rounded to 5 decimal places.<br />
* longitude made negative (West is negative in decimal degree format)<br />
* commas in comments replaced with semicolon for additional csv format support.<br />
*&nbsp;Values "Nd" and "nd" in source file classified as missing data identifiers. Missing data values (Blank/Null) values in this dataset are displayed according to the format of data you access. For example, in csv files it will be blank values. In Matlab .mat files it will be NaN values. When viewing data online at BCO-DMO, the missing value will be shown as "nd" meaning "no data."&nbsp; &nbsp;See https://www.bco-dmo.org/page/bco-dmo-data-processing-conventions</div>
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
PI Supplied Instrument Name: PI Supplied Instrument Description:Corer,(push coring method with plunger) manufactured in house at University of South Carolina. Consists of plastic tube and plunger assembly to allow for minimal sediment disruption and loss of pore water. Instrument Name: Push Corer Instrument Short Name: Instrument Description: Capable of being performed in numerous environments, push coring is just as it sounds. Push coring is simply pushing the core barrel (often an aluminum or polycarbonate tube) into the sediment by hand. A push core is useful in that it causes very little disturbance to the more delicate upper layers of a sub-aqueous sediment.
Description obtained from: http://web.whoi.edu/coastal-group/about/how-we-work/field-methods/coring/
PI Supplied Instrument Name: PI Supplied Instrument Description:Radium Delayed Coincidence Counter, Manufactured by Scientific Computer Instruments. Used to measure 220Rn and 219Rn which allows for the quantification of 224Ra and 228Th. 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.