http://lod.bco-dmo.org/id/dataset/945225
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
2024-12-04
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Total water-column Thorium-234 measurements collected during January cruises of the Palmer LTER program along the Western Antarctic Peninsula from 2016-2020
2024-12-04
publication
2024-12-04
revision
BCO-DMO Linked Data URI
2024-12-04
creation
http://lod.bco-dmo.org/id/dataset/945225
Michael R. Stukel
Florida State 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: Stukel, M. R. (2024) Total water-column Thorium-234 measurements collected during January cruises of the Palmer LTER program along the Western Antarctic Peninsula from 2016-2020. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-12-04 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/945225 [access date]
Thorium-234 along the Western Antarctic Peninsula (2016-2020) Dataset Description: Methods and Sampling: <p>Total 234Th was measured using standard small volume techniques (Benitez-Nelson et al., 2001; Pike et al., 2005). 4-liter (L) samples for total 234Th were sampled using a CTD Niskin rosette (typically from eight depths spanning the epipelagic). Samples were acidified to a pH of &lt;2 with HNO3. A tracer addition of 230Th was added and samples were mixed vigorously. Samples were allowed to equilibrate for 4-9 hours and then adjusted to a pH of 8-9 with NH4OH. KMnO4 and MnCl2 were added and samples were mixed and allowed to sit for ~12 hours as Th co-precipitated with manganese oxide. Samples were then vacuum-filtered at high pressure onto QMA filters, dried, and mounted in RISO sample holders.</p>
<p>Samples were beta counted on a RISO low-level background beta counter at Palmer Station and re-counted &gt;6 half-lives later. Samples for water-column 234Th were then dissolved in HNO3/H2O2 solution and 229Th tracer was added. Samples were evaporated and reconstituted in dilute nitric acid / hydrofluoric acid. They were then analyzed by inductively-coupled plasma mass spectrometry at the Woods Hole Oceanographic Institution Analytical Lab to determine the ratio of 229:230Th to determine the initial yield of the 234Th filtration. 238U activity (for estimating 238U-234Th deficiency) was estimated from a linear relationship with salinity (Owens et al., 2011).</p>
Funding provided by NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP) Award Number: OPP-1951090 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1951090
onGoing
Michael R. Stukel
Florida State University
815-258-3875
Earth, Ocean, and Atmos. Science Building (EOA) Rm. 6089 1011 Academic Way
Tallahassee
FL
32306
USA
mstukel@fsu.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Cruise
Event
GridLine
GridStation
Latitude
Longitude
Niskin
Depth
Salinity
U238
ISO_DateTime_Local
ISO_DateTime_UTC
Th234_Activity
Th234_Activity_Absolute_Error
Deficiency
Deficiency_Absolute_Error
inductively-coupled plasma mass spectrometry
CTD Niskin rosette
RISO low-level GM beta multi-counter
theme
None, User defined
Cruise identfier
event
grid_line
grid_sta
latitude
longitude
bottle
depth
salinity
U238_in_sw
ISO_DateTime_Local
ISO_DateTime_UTC
thorium-234 activity
No BCO-DMO term
featureType
BCO-DMO Standard Parameters
Inductively Coupled Plasma Mass Spectrometer
Niskin bottle
Riso Laboratory Anti-coincidence Beta Counter
instrument
BCO-DMO Standard Instruments
LMG1801
LMG1601
LMG1701
LMG1901
LMG2001
service
Deployment Activity
Palmer LTER
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.
Quantifying Processes Driving Interannual Variability in the Biological Carbon Pump in the Western Antarctic Peninsula
https://osprey.bco-dmo.org/project/838048
Quantifying Processes Driving Interannual Variability in the Biological Carbon Pump in the Western Antarctic Peninsula
<p><em>NSF Award Abstract:</em><br />
Algae in the surface ocean convert carbon dioxide into organic carbon through photosynthesis. The biological carbon pump transports this organic carbon from the atmosphere to the deep ocean where it can be stored for tens to hundreds of years. Annually, the amount transported is similar to that humans are currently emitting by burning fossil fuels. However, at present we cannot predict how this important process will change with a warming ocean. These investigators plan to develop a 15+ year time-series of vertical carbon transfer for the Western Antarctic Peninsula; a highly productive Antarctic ecosystem. This region is also rapid transition to warmer temperatures leading to reduced sea ice coverage. This work will help researchers better understand how the carbon cycle in the Western Antarctic Peninsula will respond to climate change. The researchers will develop the first large-scale time-series of carbon flux anywhere in the ocean. This research will also support the education and training of a graduate student and support the integration of concepts in Antarctic research into two undergraduate courses designed for non-science majors and advanced earth science students. The researchers will also develop educational modules for introducing elementary and middle-school age students to important concepts such as gross and net primary productivity, feedbacks in the marine and atmospheric systems, and the differences between correlation and causation. Results from this proposal will also be incorporated into a children’s book, “Plankton do the Strangest Things”, that is targeted at 5-7 year olds and is designed to introduce them to the incredible diversity and fascinating adaptations of microscopic marine organisms.</p>
<p>This research seeks to leverage 6 years (2015-2020) of 234Th samples collected on Palmer LTER program, 5 years of prior measurements (2009-2010, 2012-2014), and upcoming cruises (2021-2023) to develop a time-series of summertime particle flux in the WAP that stretches for 15 years. The 238U-234Th disequilibrium approach utilizes changes in the activity of the particle-active radio-isotope 234Th relative to its parent nuclide 238U to quantify the flux of sinking carbon out of the surface ocean (over a time-scale of ~one month). This proposal will fund 234Th analyses from nine years’ worth of cruises (2015-2023) and extensive analyses designed to investigate the processes driving inter-annual variability in the BCP. These include: 1) physical modeling to quantify the importance of advection and diffusion in the 234Th budget, 2) time-series analyses of particle flux, and 3) statistical modeling of the relationships between particle flux and multiple presumed drivers (biological, chemical, physical, and climate indices) measured by collaborators in the Palmer LTER program. This multi-faceted approach is critical for linking the measurements to models and for predicting responses to climate change. It will also test the hypothesis that export flux is decreasing in the northern WAP, increasing in the southern WAP, and increasing when integrated over the entire region as a result of earlier sea ice retreat and a larger ice-free zone. The project will also investigate relationships between carbon export and multiple potentially controlling factors including: primary productivity, algal biomass and taxonomic composition, biological oxygen saturation, zooplankton biomass and taxonomic composition, bacterial production, temperature, wintertime sea ice extent, date of sea ice retreat, and climate modes.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
WAP Carbon export
largerWorkCitation
project
eng; USA
oceans
Palmer LTER
-78.19839
-64.398014
-69.39223
-63.9653
2016-01-11
2020-02-02
Western Antarctic Peninsula (Palmer LTER Study Region)
0
BCO-DMO catalogue of parameters from Total water-column Thorium-234 measurements collected during January cruises of the Palmer LTER program along the Western Antarctic Peninsula from 2016-2020
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/945316.rdf
Name: Cruise
Units: unitless
Description: <p>The identifier for the Palmer LTER cruise from which the data was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/945317.rdf
Name: Event
Units: unitless
Description: <p>Unique cruise event number that identifies the CTD cast from which the sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/945318.rdf
Name: GridLine
Units: unitless
Description: <p>Palmer LTER grid line from which sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/945319.rdf
Name: GridStation
Units: unitless
Description: <p>Palmer LTER grid station from which sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/945320.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Latitude of sample collection; negative values = South</p>
http://lod.bco-dmo.org/id/dataset-parameter/945321.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Longitude of sample collection; negative values = West</p>
http://lod.bco-dmo.org/id/dataset-parameter/945322.rdf
Name: Niskin
Units: unitless
Description: <p>Number of the Niskin bottle from which sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/945323.rdf
Name: Depth
Units: meters (m)
Description: <p>Sample collection depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/945324.rdf
Name: Salinity
Units: PSU
Description: <p>Salinity determined from a Seabird CTD</p>
http://lod.bco-dmo.org/id/dataset-parameter/945325.rdf
Name: U238
Units: decays per minute per liter (dpm/L)
Description: <p>Activity of U-238 determined from a regression with salinity</p>
http://lod.bco-dmo.org/id/dataset-parameter/945326.rdf
Name: ISO_DateTime_Local
Units: unitless
Description: <p>Collection date and time in ISO 8601 format; Local time zone is UTC-0400</p>
http://lod.bco-dmo.org/id/dataset-parameter/945327.rdf
Name: ISO_DateTime_UTC
Units: unitless
Description: <p>Collection date and time in ISO 8601 format in UTC</p>
http://lod.bco-dmo.org/id/dataset-parameter/945328.rdf
Name: Th234_Activity
Units: decays per minute per liter (dpm/L)
Description: <p>Activity of total water-column Thorium-234</p>
http://lod.bco-dmo.org/id/dataset-parameter/945329.rdf
Name: Th234_Activity_Absolute_Error
Units: decays per minute per liter (dpm/L)
Description: <p>Uncertainty in Thorium-234 activity</p>
http://lod.bco-dmo.org/id/dataset-parameter/945330.rdf
Name: Deficiency
Units: decays per minute per liter (dpm/L)
Description: <p>238Uranium minus 234Th disequilibrium</p>
http://lod.bco-dmo.org/id/dataset-parameter/945331.rdf
Name: Deficiency_Absolute_Error
Units: decays per minute per liter (dpm/L)
Description: <p>Uncertainty in uranium-thorium disequilibrium</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/945225/data/download
download
onLine
dataset
<p>Total 234Th was measured using standard small volume techniques (Benitez-Nelson et al., 2001; Pike et al., 2005). 4-liter (L) samples for total 234Th were sampled using a CTD Niskin rosette (typically from eight depths spanning the epipelagic). Samples were acidified to a pH of &lt;2 with HNO3. A tracer addition of 230Th was added and samples were mixed vigorously. Samples were allowed to equilibrate for 4-9 hours and then adjusted to a pH of 8-9 with NH4OH. KMnO4 and MnCl2 were added and samples were mixed and allowed to sit for ~12 hours as Th co-precipitated with manganese oxide. Samples were then vacuum-filtered at high pressure onto QMA filters, dried, and mounted in RISO sample holders.</p>
<p>Samples were beta counted on a RISO low-level background beta counter at Palmer Station and re-counted &gt;6 half-lives later. Samples for water-column 234Th were then dissolved in HNO3/H2O2 solution and 229Th tracer was added. Samples were evaporated and reconstituted in dilute nitric acid / hydrofluoric acid. They were then analyzed by inductively-coupled plasma mass spectrometry at the Woods Hole Oceanographic Institution Analytical Lab to determine the ratio of 229:230Th to determine the initial yield of the 234Th filtration. 238U activity (for estimating 238U-234Th deficiency) was estimated from a linear relationship with salinity (Owens et al., 2011).</p>
Specified by the Principal Investigator(s)
- Imported original file "Th Logs - ForBCODMO - 2024-07-03.xlsx" into the BCO-DMO system.
- Renamed fields to comply with BCO-DMO naming conventions.
- Converted the local date-time column to ISO 8160 format.
- Added a date-time column in UTC.
- Saved the final file as "945225_v1_th-234_wap.csv"
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
inductively-coupled plasma mass spectrometry
inductively-coupled plasma mass spectrometry
PI Supplied Instrument Name: inductively-coupled plasma mass spectrometry PI Supplied Instrument Description:Samples were analyzed by inductively-coupled plasma mass spectrometry to determine the ratio of 229:230Th Instrument Name: Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:ICP Mass Spec Instrument Description: An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/
CTD Niskin rosette
CTD Niskin rosette
PI Supplied Instrument Name: CTD Niskin rosette PI Supplied Instrument Description:Samples for total 234Th were sampled using a CTD Niskin rosette (typically from eight depths spanning the epipelagic) 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/
RISO low-level GM beta multi-counter
RISO low-level GM beta multi-counter
PI Supplied Instrument Name: RISO low-level GM beta multi-counter PI Supplied Instrument Description:Samples were beta counted on a RISO low-level background beta counter Instrument Name: Riso Laboratory Anti-coincidence Beta Counter Instrument Short Name:Riso Beta Counter Instrument Description: Low-level beta detectors manufactured by Riso (now Nutech) in Denmark. These instruments accept samples that can be mounted on a 25mm filter holder. These detectors have very low backgrounds, 0.17 counts per minute, and can have counting efficiencies as high as 55%.
Typically used in laboratory analyses. Designed to measure low levels of beta particle emission. The systems work on the principle of anticoincidence.
Cruise: LMG1801
LMG1801
ARSV Laurence M. Gould
Community Standard Description
International Council for the Exploration of the Sea
ARSV Laurence M. Gould
vessel
Cruise: LMG1601
LMG1601
ARSV Laurence M. Gould
Community Standard Description
International Council for the Exploration of the Sea
ARSV Laurence M. Gould
vessel
Cruise: LMG1701
LMG1701
ARSV Laurence M. Gould
Community Standard Description
International Council for the Exploration of the Sea
ARSV Laurence M. Gould
vessel
Cruise: LMG1901
LMG1901
ARSV Laurence M. Gould
Community Standard Description
International Council for the Exploration of the Sea
ARSV Laurence M. Gould
vessel
Cruise: LMG2001
LMG2001
ARSV Laurence M. Gould
Community Standard Description
International Council for the Exploration of the Sea
ARSV Laurence M. Gould
vessel
ARSV Laurence M. Gould
Community Standard Description
International Council for the Exploration of the Sea
ARSV Laurence M. Gould
vessel