http://lod.bco-dmo.org/id/dataset/1003205
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
2026-07-29
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Aerosol and seawater beryllium-7 concentrations from the US GEOTRACES GP17-ANT cruise in the Amundsen Sea on RVIB Nathaniel B. Palmer (NBP2401) from November 2023 to January 2024
2026-07-29
publication
2026-07-29
revision
Woods Hole Oceanographic Institution (WHOI BCO-DMO)
2026-08-03
publication
https://doi.org/10.26008/1912/bco-dmo.1003205.1
Clifton S. Buck
Skidaway Institute of Oceanography
principalInvestigator
Christopher Marsay
University of Delaware
principalInvestigator
Yipeng He
Florida International University
principalInvestigator
Mark Stephens
Florida International 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: Christopher Marsay, Mark Stephens, Yipeng He, Clifton S. Buck (2026) Aerosol and seawater beryllium-7 concentrations from the US GEOTRACES GP17-ANT cruise in the Amundsen Sea on RVIB Nathaniel B. Palmer (NBP2401) from November 2023 to January 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-07-29 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.1003205.1 [access date]
GP17-ANT aerosol and seawater beryllium-7 concentrations Dataset Description: Methods and Sampling: <p><strong>Seawater sampling:</strong> Procedures used during GEOTRACES GP17-ANT were identical to those described for previous U.S. GEOTRACES cruises (Kadko, 2017; Kadko et al., 2020; He et al., 2025). Briefly, a centrifugal pump on deck was used to draw 500-750 liters (L) of seawater from predetermined depths via a 1.5-inch PVC hose to fill large plastic tanks on deck. Be-7 was then extracted by pumping this seawater through 200 grams of iron-impregnated acrylic fibers at a flowrate of ~10 L per minute (Lai et al., 1988; Krishnaswami et al., 1972; Lee et al., 1991). A temperature/depth recorder was attached close to the end of the hose to confirm an accurate sampling depth.</p>
<p><strong>Aerosol sampling:</strong> Bulk aerosol samples were collected following procedures described for previous U.S. GEOTRACES cruises (Shelley et al., 2015; Buck et al., 2019; Marsay et al., 2018, 2022). Briefly, for each deployment, one of five Tisch Environmental high-volume (~1 cubic meter air per minute) aerosol samplers was loaded with 12 replicate 47-millimeter (mm) diameter Whatman 41 filters on open-face filter holders (Advantec MFS) installed on a PVC adaptor plate (Shelley et al., 2015). Filters were acid-washed before use to lower trace element blanks (Morton et al., 2013). Samplers were installed above the bridge of RVIB Nathaniel B. Palmer and operation was controlled by wind speed and direction through a Campbell Scientific CR800 data-logger interfaced with a sonic anemometer set up alongside the samplers. In this way, sampling was restricted to periods when relative wind speed and direction were &gt;0.5 meters per second and from within ±60 degrees of the bow of the ship for at least five continuous minutes.</p>
<p><strong>Analytical procedures:</strong> Samples were counted for Be-7 using low-background germanium gamma detectors at Florida International University (FIU). For aerosols, three replicate filters from each deployment were stacked in a petri dish for counting. For seawater, the fibers were dried and then ashed. The iron hydroxide powder remaining after ashing was pressed into a 5.8-centimeter (cm) diameter pellet and the pellet thickness measured, then placed in a petri dish for counting. Be-7 has a readily identifiable peak at 478 kiloelectron volts (keV), and the spectra were evaluated using Maestro (Ortec) or Genie 2000 Canberra software. The detectors were calibrated for each geometry by adding a commercially prepared mixed isotope solution of known gamma activities (Eckert &amp; Ziegler Mixed Nuclide Solution 7500) to three W41 filters (for aerosol samples) and pellets of various thickness (for seawater samples) to derive calibration curves using peaks associated with the following isotopes: Sn-113 at 392 keV, Sr-85 at 514 keV, Cs-137 at 662 keV. Counting efficiencies of the four detectors at FIU ranged from 0.035304 to 0.05686 for Be-7 on aerosol filters, and from 0.07873 to 0.083779 for pellets derived from seawater samples.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2049305 Award URL: https://www.nsf.gov/awardsearch/show-award/?AWD_ID=2049305
completed
Clifton S. Buck
Skidaway Institute of Oceanography
912-598-2418
Skidaway Institute of Oceanography 10 Ocean Science Circle
Savannah
GA
31411
USA
csbuck@uga.edu
pointOfContact
Christopher Marsay
University of Delaware
DE
USA
cmarsay@udel.edu
pointOfContact
Yipeng He
Florida International University
yipeng.he@whoi.edu
pointOfContact
Mark Stephens
Florida International University
305-348-8354
10555 W Flagler Street
Miami
FL
33174
USA
mstephen@fiu.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Station_ID
Event_ID
Start_ISO_DateTime_UTC
Start_Date_UTC
Start_Time_UTC
End_ISO_DateTime_UTC
End_Date_UTC
End_Time_UTC
Start_Latitude
Start_Longitude
End_Latitude
End_Longitude
Sample_ID
Sample_Depth
Be_7_D_CONC_PUMP_6lx09j
SD1_Be_7_D_CONC_PUMP_6lx09j
Flag_Be_7_D_CONC_PUMP_6lx09j
Be_7_A_T_CONC_HIVOL_i4ryrh
SD1_Be_7_A_T_CONC_HIVOL_i4ryrh
Flag_Be_7_A_T_CONC_HIVOL_i4ryrh
Tisch aerosol sampler (model TE-5170-BL)
R.M. Young anemometer (model RMY86004)
Campbell Scientific datalogger
Low background germanium gamma detectors
Centrifugal pump (Dayton 1D872)
theme
None, User defined
station
event
ISO_DateTime_UTC
date
time of day
latitude
longitude
sample identification
depth
beryllium
quality flag
featureType
BCO-DMO Standard Parameters
Aerosol Sampler
Anemometer
Data Logger
Germanium detector
Pump
instrument
BCO-DMO Standard Instruments
NBP2401
service
Deployment Activity
Punta Arenas, Chile to Lyttelton, New Zealand
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.
U.S. GEOTRACES
http://www.geotraces.org/
U.S. GEOTRACES
GEOTRACES is a SCOR sponsored program; and funding for program infrastructure development is provided by the U.S. National Science Foundation.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.
U.S. GEOTRACES
largerWorkCitation
program
US GEOTRACES GP17 Section: Amundsen Sea Sector of the Antarctic Continental Margin (GP17-ANT)
https://www.geotraces.org/
US GEOTRACES GP17 Section: Amundsen Sea Sector of the Antarctic Continental Margin (GP17-ANT)
<p>U.S. GEOTRACES extended its meridional transect, initiated on the 2018 GP15 Alaska-Tahiti expedition, south to the Antarctic ice edge and then east to Chile with GP17-OCE (December 2022 - January 2023). Because of the potentially important trace elements and isotopes (TEIs) inputs and transformations occurring in Antarctic waters and shelves, GP17 also had a second leg, GP17-ANT (November 29, 2023 - January 30, 2024) into coastal and shelf waters of Antarctica’s Amundsen Sea. Further information is available on the <a href="https://usgeotraces.ldeo.columbia.edu/content/gp17-ant" target="_blank">US GEOTRACES website</a>.</p>
<p><em>NSF Project Title:</em> Collaborative Research: Management and Implementation of US GEOTRACES GP17 Section: Amundsen Sea Sector of the Antarctic Continental Margin (GP17-ANT)</p>
<p><em>NSF Award Abstract:</em><br />
This project will support the management and implementation of a 60-day research cruise to the Amundsen Sea sector of the Antarctic continental margin to collect samples for measurements of a broad suite of trace elements and isotopes ('TEIs'), as part of the U.S. GEOTRACES program. GEOTRACES is a global effort in the field of Chemical Oceanography, the goal of which is to understand the distributions of trace elements and their isotopes in the ocean. Determining the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. Key TEIs include essential micronutrients such as iron and zinc; 'tracers' such as aluminum, manganese, and isotopes of nitrogen, thorium and neodymium that can be used to investigate modern and ancient ocean processes; and elements such as lead that are indicative of human activities. In the Southern Ocean, the Antarctic continental margins are important as sources of micronutrient trace elements such as iron, which is required to support biological production and carbon export over the Antarctic shelf and in offshore waters of the Antarctic Circumpolar Current. Moreover, these regions are experiencing rapid environmental changes that are expected to impact oceanic circulation and biogeochemical cycles, for which TEIs provide crucial data needed to test and refine numerical models of the Earth system. The Amundsen Sea sector holds particular interest because of the pronounced, decadal-scale increases in the melting rates of glacial ice shelves that border the region, driven by intrusions of warm Circumpolar Deep Water onto the continental shelf. This melting has potentially major impacts on global sea level, on the formation of Antarctic Bottom Water in the Ross Sea, and on the regional ecosystem.</p>
<p>The cruise will comprise essential sampling operations (collection and shipboard processing) and ancillary measurements (hydrography, nutrients, algal pigments) in support of multiple, individual science projects, following the successful model of previous U.S. GEOTRACES cruises in the Atlantic, Pacific and Arctic ocean basins. The cruise will sample the ocean region between 100°W and 135°W, with stations ranging from 67°S in the Antarctic Circumpolar Current southward to the Amundsen Sea continental shelf, including stations adjacent to several rapidly melting ice shelves and in highly-productive shelf polynyas. Water column samples will be collected using conventional and trace-metal clean CTD-rosette systems, in-situ high-volume pumps, and a towed fish sampler or small boat, using established methods. Sampling time will also be provided for collection of sea ice, floating glacial ice, and seafloor sediments. To facilitate coordination with a complementary open-ocean cruise and ensure access to the study region to document the impact of biological processes, the cruise is planned for late austral summer (late January-late March). Beyond the disciplinary contributions, the proposed research will contribute knowledge concerning the cryosphere and its impacts on global sea level and ocean circulation, regional ecosystems and biological processes, ocean-atmosphere interactions, and past and future environmental change. The project will contribute to STEM education and outreach through the participation of an NSF-funded PolarTREC education professional, and a K-12 STEM program for students from underserved and underrepresented schools run by Rutgers University education specialists. To foster public engagement, the investigators will partner with the UCSC Science Communication Program to engage freelance science journalists to profile research in this spectacular and harsh Antarctic environment.</p>
GP17-ANT
largerWorkCitation
project
US GEOTRACES GP17-OCE and GP17-ANT: Atmospheric Deposition and Aerosol Fractional Solubility in Remote Ocean Regions
https://osprey.bco-dmo.org/project/996949
US GEOTRACES GP17-OCE and GP17-ANT: Atmospheric Deposition and Aerosol Fractional Solubility in Remote Ocean Regions
<p><em>NSF Award Abstract:</em><br />
Trace Elements are defined by their low concentrations in the open ocean and their addition and removal rates are key uncertainties in our understanding of ocean chemistry. In spite of their scarcity, trace elements can play an outsized role in determining where living things thrive in the open ocean. Near the coasts, these elements may be found in abundance because of features like rivers which bring source material from the continents to the ocean. Far from land, however, trace elements are scarce. The most significant source of these elements to the open ocean may come from dust and other particles falling onto the surface water either directly, or within rain droplets. An improved understanding of this process will further knowledge of element cycling in the ocean, including the carbon cycle. This project will sample the atmosphere of the South Pacific Ocean and the Pacific sector of the Southern Ocean around Antarctica. Input from the atmosphere to these waters is not well known and the research results will provide much needed information to the scientific community. This project will support an early career researcher as well as a graduate student.</p>
<p>The deposition and subsequent dissolution of aerosols in surface waters remains a critical research area in the oceanographic community. Much of the ocean remains poorly sampled and improvements in flux estimates, chemical characterization, and fractional solubility estimates are necessary to improve the understanding of this important trace element source. This project will include a cruise in the South Pacific Ocean and one in the Amundsen Sea sector of the Southern Ocean, both as part of the GEOTRACES program. The cruise tracks will cover regions which lie downwind of dust producing regions of Australia and where atmospheric deposition could play a role in dictating distributions of trace elements in the water column. The flux of aerosols across the air-sea interface is a key research area within GEOTRACES and the broader oceanographic community. Flux from the atmosphere to the ocean is highly episodic making the capture of this important term difficult in the open ocean. Flux rates will be determined by the use of the cosmogenic isotope 7Be, providing a rate estimate for time scales longer than the cruise period. Aerosol trace element fractional solubility remains poorly constrained and is one of the reasons that biogeochemical models show poor agreement for marine trace element distributions. Aerosol dissolution will be tested in several solution of varying chemistry to provide a range of solubility estimates which are representative of conditions in precipitation, surface seawater, and in more aggressive environments which provide a high-end solubility estimate. Calculated terms like residence time are also poorly constrained due to this uncertainty. This project will address these questions by capturing bulk and size-fractionated aerosol samples as well as samples of precipitation. The study will advance understanding of dust and soluble aerosol trace element flux from the atmosphere to the ocean and provide contextual data for complimentary studies associated with these GEOTRACES section cruises.</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>
GP17-OCE and GP17-ANT Remote Ocean Aerosols
largerWorkCitation
project
eng; USA
oceans
Punta Arenas, Chile to Lyttelton, New Zealand
-176.366
-63.926
-74.368
-52.619
2023-12-01
2024-01-20
From projects that focused on the following 2 locations: 1. Amundsen Sea Sector of the Antarctic Continental Margin 2. Amundsen Sea and Southern Ocean
0
BCO-DMO catalogue of parameters from Aerosol and seawater beryllium-7 concentrations from the US GEOTRACES GP17-ANT cruise in the Amundsen Sea on RVIB Nathaniel B. Palmer (NBP2401) from November 2023 to January 2024
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/1003238.rdf
Name: Station_ID
Units: unitless
Description: <p>Station number (no station number for aerosol samples)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003239.rdf
Name: Event_ID
Units: unitless
Description: <p>Event number in GP17-ANT cruise log</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003240.rdf
Name: Start_ISO_DateTime_UTC
Units: unitless
Description: <p>Date and time (UTC) at start of sample collection in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003242.rdf
Name: Start_Date_UTC
Units: unitless
Description: <p>Sample collection start date (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003243.rdf
Name: Start_Time_UTC
Units: unitless
Description: <p>Sample collection start time (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003244.rdf
Name: End_ISO_DateTime_UTC
Units: unitless
Description: <p>Date and time (UTC) at end of sample collection in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003245.rdf
Name: End_Date_UTC
Units: unitless
Description: <p>Sample collection end date (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003246.rdf
Name: End_Time_UTC
Units: unitless
Description: <p>Sample collection end time (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003247.rdf
Name: Start_Latitude
Units: Decimal degrees
Description: <p>Latitude at start of sample collection (North is positive)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003249.rdf
Name: Start_Longitude
Units: Decimal degrees
Description: <p>Longitude at start of sample collection (East is positive)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003251.rdf
Name: End_Latitude
Units: Decimal degrees
Description: <p>Latitude at end of sample collection (North is positive)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003252.rdf
Name: End_Longitude
Units: Decimal degrees
Description: <p>Longitude at end of sample collection (East is positive)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003253.rdf
Name: Sample_ID
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003254.rdf
Name: Sample_Depth
Units: meters (m)
Description: <p>Depth of seawater sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003256.rdf
Name: Be_7_D_CONC_PUMP_6lx09j
Units: microBecquerel per kilogram (μBq/kg)
Description: <p>Seawater beryllium-7 activity concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003257.rdf
Name: SD1_Be_7_D_CONC_PUMP_6lx09j
Units: microBecquerel per kilogram (μBq/kg)
Description: <p>One standard deviation for Be_7_D_CONC_PUMP_6lx09j</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003258.rdf
Name: Flag_Be_7_D_CONC_PUMP_6lx09j
Units: unitless
Description: <p>Quality flag for Be_7_D_CONC_PUMP_6lx09j</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003259.rdf
Name: Be_7_A_T_CONC_HIVOL_i4ryrh
Units: milliBecquerel per cubic meter (mBq/m^3)
Description: <p>Aerosol beryllium-7 activity concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003260.rdf
Name: SD1_Be_7_A_T_CONC_HIVOL_i4ryrh
Units: milliBecquerel per cubic meter (mBq/m^3)
Description: <p>One standard deviation for Be_7_A_T_CONC_HIVOL_i4ryrh</p>
http://lod.bco-dmo.org/id/dataset-parameter/1003261.rdf
Name: Flag_Be_7_A_T_CONC_HIVOL_i4ryrh
Units: unitless
Description: <p>Quality flag for Be_7_A_T_CONC_HIVOL_i4ryrh</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://doi.org/10.26008/1912/bco-dmo.1003205.1
download
onLine
dataset
<p><strong>Seawater sampling:</strong> Procedures used during GEOTRACES GP17-ANT were identical to those described for previous U.S. GEOTRACES cruises (Kadko, 2017; Kadko et al., 2020; He et al., 2025). Briefly, a centrifugal pump on deck was used to draw 500-750 liters (L) of seawater from predetermined depths via a 1.5-inch PVC hose to fill large plastic tanks on deck. Be-7 was then extracted by pumping this seawater through 200 grams of iron-impregnated acrylic fibers at a flowrate of ~10 L per minute (Lai et al., 1988; Krishnaswami et al., 1972; Lee et al., 1991). A temperature/depth recorder was attached close to the end of the hose to confirm an accurate sampling depth.</p>
<p><strong>Aerosol sampling:</strong> Bulk aerosol samples were collected following procedures described for previous U.S. GEOTRACES cruises (Shelley et al., 2015; Buck et al., 2019; Marsay et al., 2018, 2022). Briefly, for each deployment, one of five Tisch Environmental high-volume (~1 cubic meter air per minute) aerosol samplers was loaded with 12 replicate 47-millimeter (mm) diameter Whatman 41 filters on open-face filter holders (Advantec MFS) installed on a PVC adaptor plate (Shelley et al., 2015). Filters were acid-washed before use to lower trace element blanks (Morton et al., 2013). Samplers were installed above the bridge of RVIB Nathaniel B. Palmer and operation was controlled by wind speed and direction through a Campbell Scientific CR800 data-logger interfaced with a sonic anemometer set up alongside the samplers. In this way, sampling was restricted to periods when relative wind speed and direction were &gt;0.5 meters per second and from within ±60 degrees of the bow of the ship for at least five continuous minutes.</p>
<p><strong>Analytical procedures:</strong> Samples were counted for Be-7 using low-background germanium gamma detectors at Florida International University (FIU). For aerosols, three replicate filters from each deployment were stacked in a petri dish for counting. For seawater, the fibers were dried and then ashed. The iron hydroxide powder remaining after ashing was pressed into a 5.8-centimeter (cm) diameter pellet and the pellet thickness measured, then placed in a petri dish for counting. Be-7 has a readily identifiable peak at 478 kiloelectron volts (keV), and the spectra were evaluated using Maestro (Ortec) or Genie 2000 Canberra software. The detectors were calibrated for each geometry by adding a commercially prepared mixed isotope solution of known gamma activities (Eckert &amp; Ziegler Mixed Nuclide Solution 7500) to three W41 filters (for aerosol samples) and pellets of various thickness (for seawater samples) to derive calibration curves using peaks associated with the following isotopes: Sn-113 at 392 keV, Sr-85 at 514 keV, Cs-137 at 662 keV. Counting efficiencies of the four detectors at FIU ranged from 0.035304 to 0.05686 for Be-7 on aerosol filters, and from 0.07873 to 0.083779 for pellets derived from seawater samples.</p>
Specified by the Principal Investigator(s)
<p>Reported Be-7 activities were corrected to the time of sampling, using the following calculation:</p>
<p>[Be-7, dpm m<sup>-3</sup>] = {cpm • ct • λ• exp(λ•d)}/{CE • PE • FE • V • [1-exp(-λ•ct)]}<br />
where:</p>
<p>cpm = background corrected counts per minute for the region of interest</p>
<p>ct = count time (days)</p>
<p>λ = radioactive decay constant of Be-7 (0.013 d<sup>-1</sup>)</p>
<p>d = time from sample collection to start of count (days)</p>
<p>CE = counting efficiency</p>
<p>PE = photon emission probability (0.104 for Be-7)</p>
<p>FE = fiber extraction efficiency (92±3%)</p>
<p>V = volume (m<sup>3</sup>)</p>
<p>Activity counts were converted from dpm to Bq for submission to BCO-DMO. The error (counts) associated with each measurement is the statistical counting error (σ) and the uncertainty in the blank, √(σ<sup>2</sup> + σ<sub>b</sub><sup>2</sup>), multiplied by {ct • λ • exp(λ•d)}/{CE • PE • FE • V • [1-exp(-λ•ct)]}. The uncertainty of the extraction efficiency (3%) and the detector efficiency (2%) was in all cases smaller than the statistical counting error.</p>
<p><strong>Quality flags: </strong>Quality flags were applied following the GEOTRACES policy (<a href="https://www.geotraces.org/geotraces-quality-flag-policy/" target="_blank">https://www.geotraces.org/geotraces-quality-flag-policy/</a>), which recommends the SeaDataNet Scheme:</p>
<p>0 = no quality control;<br />
1 = good value;<br />
2 = probably good value;<br />
3 = probably bad value;<br />
4 = bad value;<br />
5 = changed value;<br />
6 = value below detection;<br />
7 = value in excess;<br />
8 = interpolated value;<br />
9 = missing value;<br />
A = value phenomenon uncertain.</p>
Specified by the Principal Investigator(s)
- Imported original file "NBP2401_Be7 data_BCODMO.xlsx" (sheet 1) into the BCO-DMO processing system.
- Treated "NaN" as missing values (missing values are empty/blank in the final CSV file).
- Renamed fields to comply with BCO-DMO naming conventions.
- Combined "Start_Date_UTC" (format %m-%d-%y) and "Start_Time_UTC" (%H:%M:%S) into a new ISO 8601 datetime column "Start_ISO_DateTime_UTC" (format %Y-%m-%dT%H:%M:%SZ, UTC).
- Combined "End_Date_UTC" and "End_Time_UTC" into a new ISO 8601 datetime column "End_ISO_DateTime_UTC" (format %Y-%m-%dT%H:%M:%SZ, UTC).
- Reformatted "Start_Date_UTC" from %m-%d-%y to %Y-%m-%d; reformatted "End_Date_UTC" similarly.
- Saved the final file as "1003205_v1_gp17-ant_aerosol_and_seawater_be7.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
Tisch aerosol sampler (model TE-5170-BL)
Tisch aerosol sampler (model TE-5170-BL)
PI Supplied Instrument Name: Tisch aerosol sampler (model TE-5170-BL) PI Supplied Instrument Description:High-volume (~1 cubic meter per minute) aerosol sampler with a brushless motor. Instrument Name: Aerosol Sampler Instrument Short Name: Instrument Description: A device that collects a sample of aerosol (dry particles or liquid droplets) from the atmosphere. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/13/
R.M. Young anemometer (model RMY86004)
R.M. Young anemometer (model RMY86004)
PI Supplied Instrument Name: R.M. Young anemometer (model RMY86004) PI Supplied Instrument Description:Sonic anemometer interfaced with the aerosol samplers to control operation with respect to wind speed and direction. Instrument Name: Anemometer Instrument Short Name:Anemometer Instrument Description: An anemometer is a device for measuring the velocity or the pressure of the wind. It is commonly used to measure wind speed. Aboard research vessels, it is often mounted with other meteorological instruments and sensors. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/101/
Campbell Scientific datalogger
Campbell Scientific datalogger
PI Supplied Instrument Name: Campbell Scientific datalogger PI Supplied Instrument Description:Interfaced with the aerosol sampler and anemometer to control the aerosol sampler and to log sampler runtime. Instrument Name: Data Logger Instrument Short Name: Instrument Description: Electronic devices that record data over time or in relation to location either with a built-in instrument or sensor or via external instruments and sensors.
Low background germanium gamma detectors
Low background germanium gamma detectors
PI Supplied Instrument Name: Low background germanium gamma detectors PI Supplied Instrument Description:Four detectors at Florida International University were used to measure Be-7 activity in aerosol and seawater samples. Instrument Name: Germanium detector Instrument Short Name: Instrument Description: Germanium detectors are semiconductor diodes having a p-i-n structure in which the intrinsic (i) region is sensitive to ionizing radiation, particularly x rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region. When photons interact with the material within the depleted volume of a detector, charge carriers (holes and electrons) are produced and are swept by the electric field to the p and n electrodes. This charge, which is in proportion to the energy deposited in the detector by the incoming photon, is converted into a voltage pulse by an integral charge sensitive preamplifier. Germanium detectors are mostly used for gamma spectroscopy in nuclear physics, as well as x-ray spectroscopy.
Centrifugal pump (Dayton 1D872)
Centrifugal pump (Dayton 1D872)
PI Supplied Instrument Name: Centrifugal pump (Dayton 1D872) PI Supplied Instrument Description:A 1hp centrifugal shallow well pump used on deck to pull seawater from depths of less than 200 m through a 1.5-inch diameter hose and to pump seawater through iron-impregnated acrylic fibres to strip Be-7 from seawater. Instrument Name: Pump Instrument Short Name: Instrument Description: A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps
Cruise: NBP2401
NBP2401
Community Standard Description
International Council for the Exploration of the Sea
RVIB Nathaniel B. Palmer
vessel
NBP2401
Peter N. Sedwick
Old Dominion University
https://www.bodc.ac.uk/resources/inventories/cruise_inventory/reports/nathanielbpalmer_nbp2401.pdf
Report describing NBP2401
Community Standard Description
International Council for the Exploration of the Sea
RVIB Nathaniel B. Palmer
vessel