http://lod.bco-dmo.org/id/dataset/765859
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
2019-04-29
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Water column Th-234 activities from 4-liter water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017
2019-05-02
publication
2019-05-02
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2019-06-26
publication
https://doi.org/10.1575/1912/bco-dmo.765859.1
Kenneth O. Buesseler
Woods Hole Oceanographic Institution
principalInvestigator
Margaret L. Estapa
Skidmore College
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: Buesseler, K., Estapa, M. (2019) Water column Th-234 activities from 4-liter water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-05-02 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.765859.1 [access date]
Dataset Description: <p>Water column Th-234 activities from water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017.<br />
<br />
Related datasets collected during the same cruise:<br />
In-situ pump:&nbsp;https://www.bco-dmo.org/dataset/765850<br />
Sediment trap fluxes: https://www.bco-dmo.org/dataset/765835</p> Methods and Sampling: Samples were collected during two deployment cycles (termed “deployment 1” and “deployment 2”) occupied during the RRS Discovery cruise DY077 to the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) Site in April 2017. In each of the cycles, we conducted particle flux sampling method intercomparisons between fluxes derived from upper water column deficits of 234Th vs. its parent isotope 238U, two types of neutrally buoyant sediment traps (NBST and PELAGRA), and a surface tethered array of sediment traps (STT).
234Th profiles were sampled at the beginning and end of each deployment, triangulated 10 km apart around the drifting trap location (Figure 1). A total of 161 234Th samples were collected (Table 1). A 4-L sample was collected from CTD casts, a stable Th yield monitor was added and the pH was adjusted to promote the formation of a Mn precipitate that scavenges Th. This was then filtered onto a 25-mm diameter quartz filter (Buesseler et al., 2009). The quartz filter was dried and mounted, then beta counted on board and again 6 months post-cruise to determine the amount of interfering beta activity and detector background that was not associated with 234Th in the sample.
Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49°N, 16.5°W)
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1659995 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1659995
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1660012 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1660012
completed
Kenneth O. Buesseler
Woods Hole Oceanographic Institution
508-289-2309
266 Woods Hole Road MS #25
Woods Hole
MA
02543
USA
kbuesseler@whoi.edu
pointOfContact
Margaret L. Estapa
Skidmore College
207-581-5176
193 Clarks Cove Road
Walpole
ME
04573
United States
margaret.estapa@maine.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
deployment
station
cast
bottle
depth
lat
lon
date
time
ISO_DateTime_UTC
U238_tot
U238_tot_err
Th234_tot
Th234_tot_err
CTD Seabird 911plus
Riso Beta Counter
theme
None, User defined
deployment number
station
platform
bottle
depth
latitude
longitude
date_utc
time_utc
ISO_DateTime_UTC
U238_in_sw
thorium-234 activity
featureType
BCO-DMO Standard Parameters
CTD - profiler
Niskin bottle
Riso Laboratory Anti-coincidence Beta Counter
instrument
BCO-DMO Standard Instruments
DY077
service
Deployment Activity
Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49N, 16.5W)
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.
Collaborative Research: Are all traps created equal? A multi-method assessment of the collection and detection of sinking particles in the ocean
https://osprey.bco-dmo.org/project/762022
Collaborative Research: Are all traps created equal? A multi-method assessment of the collection and detection of sinking particles in the ocean
<p>NSF Award Abstract:</p>
<p>There is considerable need to understand the biological and ecological processes that through net primary production fix dissolved carbon dioxide (CO2) into organic matter in the upper ocean, and the processes that subsequently transport this organic carbon in to the ocean's interior. Most of the particulate organic carbon flux to the deep ocean is thought to be mediated by sinking particles. Ultimately it is the deep organic carbon transport and its sequestration that define the impact of ocean biota on atmospheric CO2 levels and hence climate. Currently, various methods are available to measure the amount of particles in the ocean that sink over a specified period of time commonly referred to as particle flux. Unfortunately, all of these methods are used independently of each other with very little intercomparison, leaving some uncertainty as to which approach provides the most accurate estimates. This study seeks to be the first concerted effort to standardize particle flux measurements. Seeking to keep the cost modest, the researchers are taking advantage of a collaboration with scientists in the United Kingdom to participate in an already scheduled research cruise. The proposed research will have much greater impact that merely standardization of particle flux measurements because it will provide the science and modeling community the ability to quantify the transfer of carbon throughout the surface ocean. Also, this project provides a variety of mentoring and training opportunities for students. A PhD student at Woods Hole Oceanographic Institute will get their first sea-going experience and will learn all of the processing steps for the study of an isotope of thorium (234Th). Skidmore College will have an undergraduate participant in the research and the results from the cruise will also be an excellent additional component for undergraduate oceanography classes.</p>
<p>Researchers from Woods Hole Oceanographic Institution and Skidmore College, in collaboration with a scientist from the National Oceanography Centre, Southampton will inter-compare direct, tracer, and optical-sensor methods used to determine sinking particle fluxes in the surface ocean. To do this, they will firstly conduct a comparison of two types of neutrally buoyant traps and one surface-tethered, drifting array. Secondly, measured trap fluxes will be compared to predicted 234Th fluxes from a 3D time-series of data. Lastly, optical sediment trap measurements will be compared to particle size distributions in the water column and gel traps, as well as size-fractionated particles on filters from large volume pumps. With this research, global ocean models, particularly carbon, will have greater accuracy and stronger conclusions will be able to be drawn from them.</p>
Are Traps Equal
largerWorkCitation
project
eng; USA
oceans
Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49N, 16.5W)
-16.78
-16.2624
48.7487
48.7487
2017-04-19
2017-04-28
Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49°N, 16.5°W)
0
BCO-DMO catalogue of parameters from Water column Th-234 activities from 4-liter water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017
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/766229.rdf
Name: deployment
Units: unitless
Description: <p>deployment cycle during cruise DY077</p>
http://lod.bco-dmo.org/id/dataset-parameter/766230.rdf
Name: station
Units: unitless
Description: <p>station occupied during cruise DY077</p>
http://lod.bco-dmo.org/id/dataset-parameter/766231.rdf
Name: cast
Units: unitless
Description: <p>CTD cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/766232.rdf
Name: bottle
Units: unitless
Description: <p>rosette bottle number</p>
http://lod.bco-dmo.org/id/dataset-parameter/766233.rdf
Name: depth
Units: meters (m)
Description: <p>depth of water sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/766234.rdf
Name: lat
Units: decimal degrees (DD)
Description: <p>latitude of CTD cast</p>
http://lod.bco-dmo.org/id/dataset-parameter/766235.rdf
Name: lon
Units: decimal degrees (DD)
Description: <p>longitude of CTD cast</p>
http://lod.bco-dmo.org/id/dataset-parameter/766236.rdf
Name: date
Units: unitless
Description: <p>date of CTD cast (GMT) in ISO 8601 format yyyy-mm-dd</p>
http://lod.bco-dmo.org/id/dataset-parameter/766237.rdf
Name: time
Units: unitless
Description: <p>time of CTD cast (GMT) in ISO 8601 format hh:mm:ss</p>
http://lod.bco-dmo.org/id/dataset-parameter/766238.rdf
Name: ISO_DateTime_UTC
Units: unitless
Description: <p>date time (UTC) in ISO 8601 format yyyy-mm-ddTHH:MMZ</p>
http://lod.bco-dmo.org/id/dataset-parameter/766239.rdf
Name: U238_tot
Units: disintegration per minute per liter (dpm/L)
Description: <p>total uranium-238 activity calculated from CTD salinity as per Owens et al. 2011</p>
http://lod.bco-dmo.org/id/dataset-parameter/766240.rdf
Name: U238_tot_err
Units: disintegration per minute per liter (dpm/L)
Description: <p>total uranium-238 uncertainty, derived from the uncertainty in the relationship in Owens et al. 2011</p>
http://lod.bco-dmo.org/id/dataset-parameter/766241.rdf
Name: Th234_tot
Units: disintegration per minute per liter (dpm/L)
Description: <p>total uranium-238 activity determined from 4-liter water samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/766242.rdf
Name: Th234_tot_err
Units: disintegration per minute per liter (dpm/L)
Description: <p>total uranium-238 uncertainty, derived from counting statistics and error propagation for mass/volume measurements and ICP-MS recovery analysis</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
13857
https://darchive.mblwhoilibrary.org/bitstream/1912/24290/1/dataset-765859_water-column-th-234-activities__v1.tsv
download
https://doi.org/10.1575/1912/bco-dmo.765859.1
download
onLine
dataset
Samples were collected during two deployment cycles (termed “deployment 1” and “deployment 2”) occupied during the RRS Discovery cruise DY077 to the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) Site in April 2017. In each of the cycles, we conducted particle flux sampling method intercomparisons between fluxes derived from upper water column deficits of 234Th vs. its parent isotope 238U, two types of neutrally buoyant sediment traps (NBST and PELAGRA), and a surface tethered array of sediment traps (STT).
234Th profiles were sampled at the beginning and end of each deployment, triangulated 10 km apart around the drifting trap location (Figure 1). A total of 161 234Th samples were collected (Table 1). A 4-L sample was collected from CTD casts, a stable Th yield monitor was added and the pH was adjusted to promote the formation of a Mn precipitate that scavenges Th. This was then filtered onto a 25-mm diameter quartz filter (Buesseler et al., 2009). The quartz filter was dried and mounted, then beta counted on board and again 6 months post-cruise to determine the amount of interfering beta activity and detector background that was not associated with 234Th in the sample.
Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49°N, 16.5°W)
Specified by the Principal Investigator(s)
Integrated 234Th fluxes were calculated as in Buesseler et al. (2009) using a 1-D steady state model.
BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.
* added ISO_DateTime_UTC column from date and time columns
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
CTD Seabird 911plus
CTD Seabird 911plus
PI Supplied Instrument Name: CTD Seabird 911plus 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: 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 Beta Counter
Riso Beta Counter
PI Supplied Instrument Name: Riso 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: DY077
DY077
Community Standard Description
International Council for the Exploration of the Sea
RRS Discovery
vessel
DY077
Dr Richard Lampitt
University of Southampton
Community Standard Description
International Council for the Exploration of the Sea
RRS Discovery
vessel