http://lod.bco-dmo.org/id/dataset/783366
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
2019-12-03
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Dissolved radium isotope activity around Guaymas Basin from samples collected by CTD and HOV Alvin during R/V Atlantis cruise AT42-05 in November 2018
2019-12-03
publication
2019-12-03
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2019-12-09
publication
https://doi.org/10.1575/1912/bco-dmo.783366.1
Richard N. Peterson
Coastal Carolina 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: Peterson, R. (2019) Dissolved radium isotope activity around Guaymas Basin from samples collected by CTD and HOV Alvin during R/V Atlantis cruise AT42-05 in November 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-12-03 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.783366.1 [access date]
This dataset presents dissolved radium isotope activities around Guaymas Basin Dataset Description: <p>This dataset presents dissolved radium isotope activities around Guaymas Basin.</p> Methods and Sampling: <p>Samples for this dataset were separated into different worksheets depending on the sample collection method (worksheets have been combined into one dataset; "Collection_Method" column indicates the source worksheet).</p>
<p>"CTD" samples were collected from 20L Niskin bottles associated with CTD casts by slowly (&lt;1 L/min) draining the sample via a sampling tube from the spigot on the Niskin bottle through a dry, 25 g aliquot of acrylic fiber impregnated with MnO<sub>2</sub> (Moore, 1976). These "Mn fibers" quantitatively sorb Ra isotopes from the aqueous phase.</p>
<p>"Core-top waters" were collected by gravity siphoning water overlying sediment cores that were collected as push cores by HOV Alvin, filtering the samples through 0.45 mm cellulose filters, then slowly (&lt; 1 L/min) passing the effluent over 25 g Mn fiber.</p>
<p>"Alvin Niskins" were recovered from one or several of the 1.25 L Niskin bottles on Alvin. On the ship, these water samples were drained from the Niskin bottles and slowly (&lt;1 L/min) passed over 25 g Mn fiber.</p>
<p>"Porewater" samples were collected by sectioning sediments cores under an inert (Ar) atmosphere at 4-5 cm intervals into 50 mL centrifuge tubes, centrifuging the samples at 5,000 RPM for 15 minutes, then decanting the supernatant fluids and filtering them through 0.45 mm syringe filters. Effluent samples were measured for volume, then diluted with 1 L Ra-free seawater before being passed slowly (&lt; 1L/min) twice through Mn fibers.</p>
<p>After passing the water samples over the Mn fibers, the fibers were rinsed with Ra-free fresh water, then dried using a compressed air stream to a suitable humidity (Sun and Torgersen, 1998). The fibers were then counted immediately on a Radium Delayed Coincidence Counter (Moore and Arnold, 1996) for total Ra-224 and Ra-223 activity. The fibers were counted again after 3 weeks to measure the supported Ra-224 activity from any sorbed Th-228 on the fibers. This activity is subtracted from the total Ra-224 activity derived from the initial measurement to compute the excess Ra-224 activity (the activity reported in the dataset). Ra-226 activities were measured by sealing the Mn fibers in air-tight cartridges for ~1 week and measuring the accumulated Rn-222 (daughter product of Ra-226) on a radon emanation line (Peterson et al., 2009). Fibers were then counted an additional time on the Radium Delayed Coincidence Counter after ~1 year from collection for Ra-228 (as the change in Th-228 activity from the 3-week measurement; Moore, 2008). Analytical uncertainties are based on counting statistics (as 1-s standard deviation of the total counts logged, propagated through the activity computations).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1558829 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1558829
completed
Richard N. Peterson
Coastal Carolina University
843-349-4057
Department of Coastal and Marine Systems Science P.O. Box 261954
Conway
SC
29528-6054
USA
rpeters2@coastal.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Collection_Method
Alvin_Dive_Number
Core_Number
Cast
Depth
Depth_cmbsf
Date_Time
Latitude
Longitude
Sample_Volume
Ra223_Activity
Ra223_Unc
Ra224_Activity
Ra224_Unc
Ra226_Activity
Ra226_Unc
Ra228_Activity
Ra228_Unc
HOV Alvin push core
CTD
theme
None, User defined
instrument
dive_id
core id
cast
depth
depth below seafloor
ISO_DateTime_UTC
latitude
longitude
sample_volume
radioactive isotope concentration
featureType
BCO-DMO Standard Parameters
Alvin tube core
CTD - profiler
Niskin bottle
Radium Delayed Coincidence Counter
instrument
BCO-DMO Standard Instruments
AT42-05
AT42-05_Alvin_Dives
service
Deployment Activity
Guaymas Basin, Gulf of California, Mexico
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.
Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin
https://osprey.bco-dmo.org/project/754843
Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin
<p><em>NSF Award Abstract:</em><br />
This project proposes to validate a new approach to measure porewater flow dynamics from deep sea sediments using a biologically conservative, naturally-occurring tracer, Radium 224, which is constantly produced by porewaters. The technique will be validated using independent measures of porewater fluxes (i.e. heat gradients and magnesium profiles) during a cruise to the Guaymas Basin in the Gulf of California that is already funded by NSF. Once validated the technique will be broadly applicable to all sedimentary environments including oceans, rivers/streams, wetlands and lakes. Understanding porewater flow dynamics is important to understanding ocean and other aquatic system chemical budgets, microbial ecology and global heat flow.</p>
<p>This proposal hypothesizes that the short-lived radium isotope Ra 224 may serve as an effective tracer of porewater flows in deep ocean systems, regardless of the type or composition of seepages, because its sources and sinks can be uniquely constrained. The method will be tested in the Guaymas Basin which is comprised of areas undergoing a range of seepage rates and offers porewater thermal gradients resulting from the hydrothermal system. As a result heat fluxes and gradients in magnesium and other cations affected by high-temperature water/rock interactions can be used to independently validate the porewater flows measured by Ra 224.</p>
Guaymas Basin Ra 224 Approach
largerWorkCitation
project
eng; USA
oceans
Guaymas Basin, Gulf of California, Mexico
-111.410617
-111.403877
27.006402
27.045537
2018-11-18
2018-11-28
Guaymas Basin, Gulf of California
0
BCO-DMO catalogue of parameters from Dissolved radium isotope activity around Guaymas Basin from samples collected by CTD and HOV Alvin during R/V Atlantis cruise AT42-05 in November 2018
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/783382.rdf
Name: Collection_Method
Units: unitless
Description: <p>Sample collection method</p>
http://lod.bco-dmo.org/id/dataset-parameter/783383.rdf
Name: Alvin_Dive_Number
Units: unitless
Description: <p>Numeric identifier for Alvin dive (not applicable where Collection_Method = CTD)</p>
http://lod.bco-dmo.org/id/dataset-parameter/783384.rdf
Name: Core_Number
Units: unitless
Description: <p>Core tube identifier for the specific Alvin dive (not applicable where Collection_Method = CTD or Alvin_Niskins )</p>
http://lod.bco-dmo.org/id/dataset-parameter/783385.rdf
Name: Cast
Units: unitless
Description: <p>Numerical reference for CTD cast # (Collection_Method = CTD only)</p>
http://lod.bco-dmo.org/id/dataset-parameter/783386.rdf
Name: Depth
Units: meters (m)
Description: <p>Sampling depth (Collection_Method = CTD only)</p>
http://lod.bco-dmo.org/id/dataset-parameter/783387.rdf
Name: Depth_cmbsf
Units: centimeters below seafloor (cmbsf)
Description: <p>Depth in centimeters below seafloor (Collection_Method = Porewater only)</p>
http://lod.bco-dmo.org/id/dataset-parameter/783388.rdf
Name: Date_Time
Units: unitless
Description: <p>Sampling date and time (GMT); format: yyyy-mm-ddTHH:MM</p>
http://lod.bco-dmo.org/id/dataset-parameter/783389.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Sampling latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/783390.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Sampling longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/783391.rdf
Name: Sample_Volume
Units: liters (L)
Description: <p>Sample volume</p>
http://lod.bco-dmo.org/id/dataset-parameter/783392.rdf
Name: Ra223_Activity
Units: dpm/100L
Description: <p>Measured activity of Ra-223; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783393.rdf
Name: Ra223_Unc
Units: dpm/100L
Description: <p>1-s analytical uncertainty in measured activity of Ra-223; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783394.rdf
Name: Ra224_Activity
Units: dpm/100L
Description: <p>Measured activity of Ra-224; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783395.rdf
Name: Ra224_Unc
Units: dpm/100L
Description: <p>1-s analytical uncertainty in measured activity of Ra-224; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783396.rdf
Name: Ra226_Activity
Units: dpm/100L
Description: <p>Measured activity of Ra-226; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783397.rdf
Name: Ra226_Unc
Units: dpm/100L
Description: <p>1-s analytical uncertainty in measured activity of Ra-226; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783398.rdf
Name: Ra228_Activity
Units: dpm/100L
Description: <p>Measured activity of Ra-223; "BD" = below detection</p>
http://lod.bco-dmo.org/id/dataset-parameter/783399.rdf
Name: Ra228_Unc
Units: dpm/100L
Description: <p>1-s analytical uncertainty in measured activity of Ra-223; "BD" = below detection</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
18484
https://darchive.mblwhoilibrary.org/bitstream/1912/24965/1/dataset-783366_guaymas-dissolved-radium-at42-05__v1.tsv
download
https://doi.org/10.1575/1912/bco-dmo.783366.1
download
onLine
dataset
<p>Samples for this dataset were separated into different worksheets depending on the sample collection method (worksheets have been combined into one dataset; "Collection_Method" column indicates the source worksheet).</p>
<p>"CTD" samples were collected from 20L Niskin bottles associated with CTD casts by slowly (&lt;1 L/min) draining the sample via a sampling tube from the spigot on the Niskin bottle through a dry, 25 g aliquot of acrylic fiber impregnated with MnO<sub>2</sub> (Moore, 1976). These "Mn fibers" quantitatively sorb Ra isotopes from the aqueous phase.</p>
<p>"Core-top waters" were collected by gravity siphoning water overlying sediment cores that were collected as push cores by HOV Alvin, filtering the samples through 0.45 mm cellulose filters, then slowly (&lt; 1 L/min) passing the effluent over 25 g Mn fiber.</p>
<p>"Alvin Niskins" were recovered from one or several of the 1.25 L Niskin bottles on Alvin. On the ship, these water samples were drained from the Niskin bottles and slowly (&lt;1 L/min) passed over 25 g Mn fiber.</p>
<p>"Porewater" samples were collected by sectioning sediments cores under an inert (Ar) atmosphere at 4-5 cm intervals into 50 mL centrifuge tubes, centrifuging the samples at 5,000 RPM for 15 minutes, then decanting the supernatant fluids and filtering them through 0.45 mm syringe filters. Effluent samples were measured for volume, then diluted with 1 L Ra-free seawater before being passed slowly (&lt; 1L/min) twice through Mn fibers.</p>
<p>After passing the water samples over the Mn fibers, the fibers were rinsed with Ra-free fresh water, then dried using a compressed air stream to a suitable humidity (Sun and Torgersen, 1998). The fibers were then counted immediately on a Radium Delayed Coincidence Counter (Moore and Arnold, 1996) for total Ra-224 and Ra-223 activity. The fibers were counted again after 3 weeks to measure the supported Ra-224 activity from any sorbed Th-228 on the fibers. This activity is subtracted from the total Ra-224 activity derived from the initial measurement to compute the excess Ra-224 activity (the activity reported in the dataset). Ra-226 activities were measured by sealing the Mn fibers in air-tight cartridges for ~1 week and measuring the accumulated Rn-222 (daughter product of Ra-226) on a radon emanation line (Peterson et al., 2009). Fibers were then counted an additional time on the Radium Delayed Coincidence Counter after ~1 year from collection for Ra-228 (as the change in Th-228 activity from the 3-week measurement; Moore, 2008). Analytical uncertainties are based on counting statistics (as 1-s standard deviation of the total counts logged, propagated through the activity computations).</p>
Specified by the Principal Investigator(s)
<p>BCO-DMO Processing:<br />
- modified parameter names (changed hyphens to underscores; replaced spaces with underscores);<br />
- formatted date/time to ISO 8601 format;<br />
- concatenated data from the 4 separate worksheets into one;<br />
-&nbsp;saved Radium Delayed Coincidence Counter calibrations as PDF - see Supplemental Files.</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
HOV Alvin push core
HOV Alvin push core
PI Supplied Instrument Name: HOV Alvin push core Instrument Name: Alvin tube core Instrument Short Name:Tube Core Instrument Description: A plastic tube, about 40 cm (16 inches) long, is pushed into the sediment by Alvin's manipulator arm to collect a sediment core.
CTD
CTD
PI Supplied Instrument Name: CTD Instrument Name: CTD - profiler Instrument Short Name: Instrument Description: The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.
This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/130/
PI Supplied Instrument Name: PI Supplied Instrument Description:Samples were collected from 20L Niskin bottles associated with CTD casts and from HOV Alvin's 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/
PI Supplied Instrument Name: 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.
Cruise: AT42-05
AT42-05
R/V Atlantis
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantis
vessel
AT42-05
Andreas Teske
University of North Carolina at Chapel Hill
Deployment: AT42-05_Alvin_Dives
AT42-05_Alvin_Dives
HOV Alvin
Community Standard Description
International Council for the Exploration of the Sea
HOV Alvin
submarine-manned
AT42-05_Alvin_Dives
Andreas Teske
University of North Carolina at Chapel Hill
R/V Atlantis
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantis
vessel
HOV Alvin
Community Standard Description
International Council for the Exploration of the Sea
HOV Alvin
submarine-manned