http://lod.bco-dmo.org/id/dataset/923028
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
2024-03-20
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Total Th data from samples collected on 5 cruises at Station ALOHA off Hawaii and Station M off California from 2019 to 2020
2024-03-20
publication
2024-03-20
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2024-04-02
publication
https://doi.org/10.26008/1912/bco-dmo.923028.1
Jeffrey C. Drazen
University of Hawaiʻi at Mānoa
principalInvestigator
Claudia R. Benitez-Nelson
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: Drazen, J. C., Benitez-Nelson, C. R. (2024) Total Th data from samples collected on 5 cruises at Station ALOHA off Hawaii and Station M off California from 2019 to 2020. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-03-20 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.923028.1 [access date]
Total Th Dataset Description: Methods and Sampling: <p>Total 234-Thorium (Th) sampling and analyses are similar to those described in Buesseler et al. (2020). Briefly, 2 liters (L) of seawater was collected from 5 - 2500 meters (m) depth. Samples were acidified to pH ~1 and a 230Th yield tracer added. After samples were allowed to equilibrate for 6-8 hours, the pH was adjusted to ~8-9, and reagents were added to form a Mn-oxide precipitate that scavenges Th. Samples were allowed to stand for ~8 hours; after which the precipitate was filtered onto a 25-millimeter (mm) quartz microfiber filter (QMA) and dried at 60 degrees Celsius (˚C) before counting on a low level RISO beta counter using a helium/1%butane gas mixture. Samples were recounted after six months to account for any residual background activity stemming from other naturally occurring radionuclides that co-precipitate with the Mn-oxide. 230Th sample recoveries were measured using ICP-MS after acid digestion and spiking with 229Th according to the methods described in Pike et al. (2005) and Umhau et al. (2019) to account for any loss of sample material during processing.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1829519 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1829519
completed
Jeffrey C. Drazen
University of Hawaiʻi at Mānoa
808-956-6567
Department of Oceanography, SOEST 1000 Pope Road
Honolulu
HI
96822
USA
jdrazen@hawaii.edu
pointOfContact
Claudia R. Benitez-Nelson
University of South Carolina
803-777-0525
School of the Earth, Ocean and Environment 701 Sumter Street
Columbia
SC
29208
USA
benitezn@mailbox.sc.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Cruise_ID
Station
lat
lon
Date
Depth
Th234
Th234_err
Standard CTD Rosette
ICP-MS
McLane WTS-LV Pump
low level RISO Beta Counter
theme
None, User defined
Cruise identfier
station
latitude
longitude
date
depth
thorium-234 activity
featureType
BCO-DMO Standard Parameters
CTD - profiler
Inductively Coupled Plasma Mass Spectrometer
McLane Large Volume Pumping System WTS-LV
Riso Laboratory Anti-coincidence Beta Counter
instrument
BCO-DMO Standard Instruments
AT42-10
Pulse 72
KM1914
KM2002
KM2008
service
Deployment Activity
Eastern North Pacific 34.50° N 123.06° W (Station M)
Station Aloha
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: Assessing the relative importance of small vs large particles as sources of nutrition to abyssal communities
https://osprey.bco-dmo.org/project/775278
Collaborative Research: Assessing the relative importance of small vs large particles as sources of nutrition to abyssal communities
<p><em>NSF Award Abstract:</em><br />
The abyssal plains of the oceans cover roughly half of the earth's surface, host enormous reservoirs of biodiversity and mineral resources, and play important roles in nutrient recycling and carbon sequestration. The most important process controlling the structure and function of these ecosystems is the quantity and quality of food (mostly sinking organic particles) that reaches the deep-sea floor. However, we do not fully understand the processes provisioning this vast ecosystem. We propose to evaluate the relative importance of small and larger "marine snow" particles that sink to deep-sea benthic communities by using the stable isotope signature of amino acids within various food sources and trace their consumption by fauna on the seafloor. This project compares ecosystems from the productive waters off California with the nutrient poor central Pacific, north of Hawaii. This project provides novel insights into how surface ocean processes are coupled to food-webs at the deep ocean seafloor and how changes in food sources potentially impact deep-sea communities. This project also provides excellent training opportunities for graduate students, a postdoctoral researcher, and undergraduates at UH and USC, particularly underrepresented minorities who pursue majors in the geosciences. The project will sponsor an annual G6-12 teacher workshop to inform Hawaii educators about the deep sea and broadly disseminate knowledge to the community. All results are communicated broadly to inform the public as concerns regarding abyssal ecosystems are rising due to interests in deep-sea mining.</p>
<p>The most important process controlling the structure and function of abyssal ecosystems is the quantity and quality of organic material that ultimately reaches the deep-sea floor. Despite the strong relationship between euphotic zone export flux and benthic ecology, studies of abyssal ecosystems have observed a deficit between food supply and benthic community demand. Additional work is therefore needed, particularly with regards to understanding the sources of nutrition to the deep-sea benthos. Recent evidence suggests that small particles may be significant contributors to carbon export, increasing in relative importance with depth in the mesopelagic and reaching the abyssal seafloor. This project is to evaluate the relative importance of small and larger "marine snow" particles to deep-sea benthic communities using a combination of particle flux measurements and state of the art compound specific stable isotope analysis of amino acids (AA-CSIA) at two abyssal locations that contrast in overlying productivity, seasonality, and export magnitude. Time series measurements at these locations (Sta. M off California and Sta. Aloha off Hawaii) provide a rich context for the work. In the mesopelagic central North Pacific larger particles (>53 um) can be resolved from microbially reworked, smaller (0.7-53 um) particles using AA-CSIA. This project is characterizing the isotopic compositions of key individual compounds in a continuum of particle sizes (< 1.0 um suspended particles to large sinking particles >53 um) collected using in situ filtration near the seafloor and bottom-moored sediment traps, thereby defining source-specific isotopic signatures that can be traced into benthic fauna and sediments (that are collected by ROVs and epibenthic sleds). This research to understand pelagic-benthic coupling from particles to megafauna using isotopic measurements at the compound-level will yield novel insights into the importance of small microbially reworked particles to deep-sea benthic food webs. This will more precisely couple surface ocean processes to food-webs at the deep ocean seafloor with implications for understanding climate change effects and the efficiency of energy transfer to higher trophic levels. Furthermore, isotopic measurements can also be used to further parameterize ecosystem models by quantifying trophic position across size classes and thus estimate predator-prey mass ratios in relation to variation in body size spectra, functional type, and ultimately to carbon flux and remineralization. Finally, the results will help refine interpretations of deep-sea paleorecords of past nitrogen dynamics by calibrating potential changes in organic matter isotope values between the surface and seafloor archives.</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>
Abyssal food web
largerWorkCitation
project
eng; USA
oceans
Eastern North Pacific 34.50° N 123.06° W (Station M); Station Aloha
-157.9
-123
22.65
35.14
2019-04-01
2020-08-31
California current, Station M (34º 50' N, 123º W) and North Pacific Subtropical Gyre, Station Aloha (22º 45' N, 158º W)
0
BCO-DMO catalogue of parameters from Total Th data from samples collected on 5 cruises at Station ALOHA off Hawaii and Station M off California from 2019 to 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/923047.rdf
Name: Cruise_ID
Units: unitless
Description: <p>Station ID number</p>
http://lod.bco-dmo.org/id/dataset-parameter/923048.rdf
Name: Station
Units: unitless
Description: <p>Station M or ALOHA</p>
http://lod.bco-dmo.org/id/dataset-parameter/923049.rdf
Name: lat
Units: decimal degrees
Description: <p>Station latitude, south is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/923050.rdf
Name: lon
Units: decimal degrees
Description: <p>Station longitude, west is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/923051.rdf
Name: Date
Units: unitless
Description: <p>Year and month</p>
http://lod.bco-dmo.org/id/dataset-parameter/923052.rdf
Name: Depth
Units: meters (m)
Description: <p>Depth in water column</p>
http://lod.bco-dmo.org/id/dataset-parameter/923053.rdf
Name: Th234
Units: disintegrations per minute per liter (dpm/L)
Description: <p>Total 234Th</p>
http://lod.bco-dmo.org/id/dataset-parameter/923054.rdf
Name: Th234_err
Units: disintegrations per minute per liter (dpm/L)
Description: <p>+/- error based on counting statistics and efficiency correction</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
5254
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/f83a46c8-8478-4897-92e6-0dd0fbb810a0/content
download
https://doi.org/10.26008/1912/bco-dmo.923028.1
download
onLine
dataset
<p>Total 234-Thorium (Th) sampling and analyses are similar to those described in Buesseler et al. (2020). Briefly, 2 liters (L) of seawater was collected from 5 - 2500 meters (m) depth. Samples were acidified to pH ~1 and a 230Th yield tracer added. After samples were allowed to equilibrate for 6-8 hours, the pH was adjusted to ~8-9, and reagents were added to form a Mn-oxide precipitate that scavenges Th. Samples were allowed to stand for ~8 hours; after which the precipitate was filtered onto a 25-millimeter (mm) quartz microfiber filter (QMA) and dried at 60 degrees Celsius (˚C) before counting on a low level RISO beta counter using a helium/1%butane gas mixture. Samples were recounted after six months to account for any residual background activity stemming from other naturally occurring radionuclides that co-precipitate with the Mn-oxide. 230Th sample recoveries were measured using ICP-MS after acid digestion and spiking with 229Th according to the methods described in Pike et al. (2005) and Umhau et al. (2019) to account for any loss of sample material during processing.</p>
Specified by the Principal Investigator(s)
<p>All data are decay corrected to the mid-point of sample collection. Calibration was confirmed using deep waters (&gt; 1000 m) with overall efficiencies determined via minimizing the difference between 238U (determined from salinity) and 234Th at depth. U-238 (not reported) was calculated using the equation described in Owens et al. (2011): U-238 (dpm/L) = (Salinity * 0.0786) – 0.315</p>
Specified by the Principal Investigator(s)
- Imported original file "Total Th Data BCO-DMO.csv" into the BCO-DMO system.
- Converted the "Date" column to YYYY-MM format.
- Renamed fields to comply with BCO-DMO naming conventions.
- Saved the final file as "923028_v1_total_th.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
Standard CTD Rosette
Standard CTD Rosette
PI Supplied Instrument Name: Standard CTD Rosette 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/
ICP-MS
ICP-MS
PI Supplied Instrument Name: ICP-MS 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/
McLane WTS-LV Pump
McLane WTS-LV Pump
PI Supplied Instrument Name: McLane WTS-LV Pump PI Supplied Instrument Description:McLane WTS-LV Pump fitted with three stage mini-MLVFS filter holders and bubbler to remove air pockets Instrument Name: McLane Large Volume Pumping System WTS-LV Instrument Short Name:WTS-LV Instrument Description: The WTS-LV is a Water Transfer System (WTS) Large Volume (LV) pumping instrument designed and manufactured by McLane Research Labs (Falmouth, MA, USA). It is a large-volume, single-event sampler that collects suspended and dissolved particulate samples in situ.
Ambient water is drawn through a modular filter holder onto a 142-millimeter (mm) membrane without passing through the pump. The standard two-tier filter holder provides prefiltering and size fractioning. Collection targets include chlorophyll maximum, particulate trace metals, and phytoplankton. It features different flow rates and filter porosity to support a range of specimen collection. Sampling can be programmed to start at a scheduled time or begin with a countdown delay. It also features a dynamic pump speed algorithm that adjusts flow to protect the sample as material accumulates on the filter. Several pump options range from 0.5 to 30 liters per minute, with a max volume of 2,500 to 36,000 liters depending on the pump and battery pack used. The standard model is depth rated to 5,500 meters, with a deeper 7,000-meter option available. The operating temperature is -4 to 35 degrees Celsius.
The WTS-LV is available in four different configurations: Standard, Upright, Bore Hole, and Dual Filter Sampler. The high-capacity upright WTS-LV model provides three times the battery life of the standard model. The Bore-Hole WTS-LV is designed to fit through a narrow opening such as a 30-centimeter borehole. The dual filter WTS-LV features two vertical intake 142 mm filter holders to allow simultaneous filtering using two different porosities.
low level RISO Beta Counter
low level RISO Beta Counter
PI Supplied Instrument Name: low level 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: AT42-10
AT42-10
R/V Atlantis
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantis
vessel
AT42-10
Jeffrey C. Drazen
University of Hawaiʻi at Mānoa
Cruise: Pulse 72
Pulse 72
R/V Western Flyer
International Council for the Exploration of the Sea
R/V Western Flyer
vessel
Pulse 72
Kenneth Smith
Monterey Bay Aquarium Research Institute
Cruise: KM1914
KM1914
R/V Kilo Moana
Community Standard Description
International Council for the Exploration of the Sea
R/V Kilo Moana
vessel
KM1914
Jeffrey C. Drazen
University of Hawaiʻi at Mānoa
Cruise: KM2002
KM2002
R/V Kilo Moana
Community Standard Description
International Council for the Exploration of the Sea
R/V Kilo Moana
vessel
KM2002
Jeffrey C. Drazen
University of Hawaiʻi at Mānoa
Cruise: KM2008
KM2008
R/V Kilo Moana
Community Standard Description
International Council for the Exploration of the Sea
R/V Kilo Moana
vessel
KM2008
Jeffrey C. Drazen
University of Hawaiʻi at Mānoa
R/V Atlantis
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantis
vessel
R/V Western Flyer
International Council for the Exploration of the Sea
R/V Western Flyer
vessel
R/V Kilo Moana
Community Standard Description
International Council for the Exploration of the Sea
R/V Kilo Moana
vessel