http://lod.bco-dmo.org/id/dataset/927568
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
2024-05-15
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 French GEOTRACES GS02 SWINGS cruise aboard R/V Marion-Dufresne (MD229) from January to March 2021
2024-05-15
publication
2024-05-15
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2024-05-24
publication
https://doi.org/10.26008/1912/bco-dmo.927568.1
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: Stephens, M. (2024) Aerosol and seawater beryllium-7 concentrations from the French GEOTRACES GS02 SWINGS cruise aboard R/V Marion-Dufresne (MD229) from January to March 2021. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-05-15 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.927568.1 [access date]
GS02 Beryllium-7 in seawater and aerosols Dataset Description: Methods and Sampling: <p><strong>Seawater sampling:</strong> The procedures used on the <span style="font-size:13px">GS02 SWINGS cruise&nbsp;</span>were identical to those described for the GEOTRACES GP15 and GP16 cruises by Kadko et al. (2017, 2020)<span style="font-size:13px">, except that a Grundfos submersible centrifugal pump rather than a deck mounted pump was used to collect the seawater</span>. <span style="font-size:13px">Briefly, the submersible pump was attached to a 1.5-inch PVC hose and lowered to selected depths.&nbsp;400 to 700 liters (L)&nbsp;of seawater were delivered to large plastic tanks in this manner. Beryllium-7 (Be-7)&nbsp;was then extracted by pumping the seawater through 200 grams (g) of iron impregnated acrylic fibers at a rate of ~10 liters per minute (Lai&nbsp;et al., 1988; Krishnaswami et al., 1972; Lee et al., 1991). A portable profiling CTD (model: Seabird SBE 19Plus) was attached to the end of the hose so that temperature, depth, and salinity could be recorded.</span></p>
<p><strong>Aerosol sampling:</strong> Aerosol samples were collected according to protocols set forth in the GEOTRACES cookbook using a Tisch TE-5170V-BL high-volume aerosol sampler modified to collect 12 replicate samples on 47-millimeter (mm) diameter Whatman-41 (W-41) filters (Wallace et al, 1977; Baker et al., 2006). In order to minimize filter blanks, the W-41 filters were pre-cleaned inside a HEPA-filtered laminar flow hood using three cycles of leaching with 0.5M HCl (Optima) and then rinsing with ultra-high purity water (UHP water) according to trace element protocols (Morton et al., 2013; similar to Baker et al., 2006). Sector control, which was accomplished via a Campbell Scientific data logger, was set such that the sampler would only operate during winds of &gt;0.5 meters per second (m/s) and from ± 60° of the ship's bow to avoid sampling air influenced by the ship's exhaust. Three replicate filters from each deployment, placed in PetriSlides, were sent to FIU for Be-7 analysis.</p>
<p><strong>Analytical procedures:</strong> Samples were counted for Be-7 onshore using low background germanium gamma detectors at Florida International University (FIU). FIU's facilities include four HPGe detectors: three Ortec Coaxial GEM series detectors and one Canberra Broad Energy gamma detector. For aerosols, the three replicate 47 mm filters were stacked in a Petri dish for counting. For seawater, the fibers were dried and then ashed. The powder remaining after ashing was pressed into a 5.8-centimeter (cm) diameter pellet, and the pellet thickness was measured. The iron hydroxide pellet was placed in a Petri dish for gamma counting. Be-7 has a readily identifiable gamma peak at 478 kiloelectron volts (keV), and the spectra were evaluated using Maestro (Ortec) or Genie 2000 (Canberra) software.</p>
<p>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 W-41 filters (for aerosol samples) and pellets of various thicknesses (for seawater) to derive a calibration curve using peaks associated with following isotopes: Sn-113 @ 392 keV, Sr-85 @ 514 keV, Cs-137 @ 662 keV. The counting efficiencies of the four detectors ranges from 0.05686 to 0.11415 for Be-7 on aerosol filters. And for the seawater pellets from this cruise, the counting efficiencies ranged from 0.03480 to 0.08590.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2023011 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2023011
completed
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_Date_UTC
Start_Time_UTC
Start_ISO_DateTime_UTC
End_Date_UTC
End_Time_UTC
End_ISO_DateTime_UTC
Start_Latitude
Start_Longitude
End_Latitude
End_Longitude
Sample_ID
Sample_Depth
Be_7_D_CONC_PUMP_ggelbm
SD1_Be_7_D_CONC_PUMP_ggelbm
Flag_Be_7_D_CONC_PUMP_ggelbm
Be_7_A_T_CONC_HIVOL_0nfmzr
SD1_Be_7_A_T_CONC_HIVOL_0nfmzr
Flag_Be_7_A_T_CONC_HIVOL_0nfmzr
Tisch TE-5170V-BL high volume aerosol sampler
Seabird SBE 19Plus
Campbell Scientific data logger
low background germanium gamma detectors
Grundfos submersible centrifugal pump
theme
None, User defined
station
event
date_start
time_start
ISO_DateTime_UTC
date end
time_end
latitude
longitude
sample identification
depth
trace metal concentration
quality flag
metal concentration in atmosphere
featureType
BCO-DMO Standard Parameters
Aerosol Sampler
CTD Sea-Bird SBE SEACAT 19plus
Data Logger
Germanium detector
Pump
instrument
BCO-DMO Standard Instruments
MD229
service
Deployment Activity
Indian sector of the Southern Ocean
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
Collaborative Research: Quantifying the atmospheric flux of bio-active trace elements to the southwestern Indian Ocean
https://osprey.bco-dmo.org/project/920218
Collaborative Research: Quantifying the atmospheric flux of bio-active trace elements to the southwestern Indian Ocean
<p><em>NSF Award Abstract:</em><br />
Marine phytoplankton (microscopic photosynthetic algae) produce about half of the oxygen we breath and remove billions of tons of carbon dioxide from the atmosphere each year. This primary productivity plays a central role in controlling atmospheric carbon dioxide (pCO2) levels and the global climate. Yet, phytoplankton productivity is limited by lack of iron (an essential trace element) in about 40% of the global ocean. While phytoplankton productivity helps remove carbon dioxide from the atmosphere, it also removes iron and other essential trace elements (like manganese, cobalt, copper, and zinc) from the upper ocean. One critical issue is, "What are the sources for these essential trace elements that are needed to replace those removed by phytoplankton to keep the annual productivity cycles going?" This is especially important in the waters of the Southern Ocean around Antarctica, where ocean circulation brings deep water to the surface; water that is enriched in nutrients like nitrate and phosphate but depleted in essential trace elements. The main source for iron in the open ocean is from desert dust deposition. In this project, scientists will collect aerosols (fine particles in the air) and rain samples over the Southern Ocean to measure how much iron (and the other essential trace elements) is depositing to surface waters. Other scientists will be measuring how fast phytoplankton are growing, and together we will learn how the input of trace elements from dust helps to remove carbon dioxide from the atmosphere. This information can then be used to help predict the future of Earth’s climate. The scientists will communicate results of their study to the public via open house events at their respective campuses, as well as through online forums. One undergraduate student from Florida International University, a leading minority serving university, would be supported and trained as part of this project.</p>
<p>The project will measure the aerosol fractional solubility and atmospheric deposition of bio-essential trace elements as part of a multidisciplinary project studying trace element sources, transformations and sinks in the Indian Ocean sector of the Southern Ocean. The research cruise track will cross the currents and oceanographic fronts that are major pathways of the general circulation in the region where we expect to find multiple possible aerosol sources, and where aerosol Fe deposition and rainfall rates are predicted to range over 1-2 orders of magnitude. Aerosol samples (bulk and size-fractionated) will be collected on a daily basis and event-based rain samples to be analyzed for total and soluble major and trace elements including nitrate, phosphate, silicate, chloride, sulfate, Na, Mg, Al, V, Mn, Fe, Co, Ni, Cu, Zn, and Cd. In addition, scientists will analyze the water-soluble organic compounds in aerosols, focusing on compounds such as oxalate and methane-sulfonic acid (MSA) that enhance aerosol trace element solubility. Scientists will use Be-7 concentrations in aerosols and the upper water column to calculate aerosol bulk deposition velocities and test whether the relationship between rainfall rate and bulk deposition velocity that we have previously published can be applied on a more global basis. Further, scientists will use the trace element concentration data along with air-mass back trajectory analysis to apportion the aerosols between anthropogenic and natural sources, and study how aerosol sources affect the fractional solubility. Aerosol and rain subsamples will be provided to collaborators on the cruise for the analysis of additional important parameters.</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>
SWINGS Be-7
largerWorkCitation
project
eng; USA
oceans
Indian sector of the Southern Ocean
31.701
81.912
-57.992
-25
2021-01-14
2021-03-04
Southwest Indian Ocean
0
BCO-DMO catalogue of parameters from Aerosol and seawater beryllium-7 concentrations from the French GEOTRACES GS02 SWINGS cruise aboard R/V Marion-Dufresne (MD229) from January to March 2021
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/927587.rdf
Name: Station_ID
Units: unitless
Description: <p>Station ID number (blank values = no station number for aerosol sampler deployments)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927588.rdf
Name: Event_ID
Units: unitless
Description: <p>Event ID</p>
http://lod.bco-dmo.org/id/dataset-parameter/927589.rdf
Name: Start_Date_UTC
Units: unitless
Description: <p>Sample collection start date</p>
http://lod.bco-dmo.org/id/dataset-parameter/927590.rdf
Name: Start_Time_UTC
Units: unitless
Description: <p>Sample collection start time (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927591.rdf
Name: Start_ISO_DateTime_UTC
Units: unitless
Description: <p>Sample collection start date and time (UTC) in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/927592.rdf
Name: End_Date_UTC
Units: unitless
Description: <p>Sample collection end date (for aerosol sampler deployments)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927593.rdf
Name: End_Time_UTC
Units: unitless
Description: <p>Sample collection end time (for aerosol sampler deployments) (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927594.rdf
Name: End_ISO_DateTime_UTC
Units: unitless
Description: <p>Sample collection send date and time (UTC) in ISO 8601 format (for aerosol sampler deployments)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927595.rdf
Name: Start_Latitude
Units: decimal degrees
Description: <p>Latitude at start of sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/927596.rdf
Name: Start_Longitude
Units: decimal degrees
Description: <p>Longitude at start of sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/927597.rdf
Name: End_Latitude
Units: decimal degrees
Description: <p>Latitude at end of sample collection (for aerosol sampler deployments)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927598.rdf
Name: End_Longitude
Units: decimal degrees
Description: <p>Longitude at end of sample collection (for aerosol sampler deployments)</p>
http://lod.bco-dmo.org/id/dataset-parameter/927599.rdf
Name: Sample_ID
Units: unitless
Description: <p>GEOTRACES sample ID number</p>
http://lod.bco-dmo.org/id/dataset-parameter/927600.rdf
Name: Sample_Depth
Units: meters (m)
Description: <p>Depth of seawater sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/927601.rdf
Name: Be_7_D_CONC_PUMP_ggelbm
Units: microBecquerel per kilogram (uBq/kg)
Description: <p>Seawater beryllium-7 activity concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/927602.rdf
Name: SD1_Be_7_D_CONC_PUMP_ggelbm
Units: microBecquerel per kilogram (uBq/kg)
Description: <p>One standard deviation for Be_7_D_CONC_PUMP_ggelbm</p>
http://lod.bco-dmo.org/id/dataset-parameter/927603.rdf
Name: Flag_Be_7_D_CONC_PUMP_ggelbm
Units: unitless
Description: <p>Quality flag for Be_7_D_CONC_PUMP_ggelbm. SeaDatNet flag scheme.</p>
http://lod.bco-dmo.org/id/dataset-parameter/927604.rdf
Name: Be_7_A_T_CONC_HIVOL_0nfmzr
Units: milliBecquerel per cubic meter (mBq/m^3)
Description: <p>Aerosol beryllium-7 activity concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/927605.rdf
Name: SD1_Be_7_A_T_CONC_HIVOL_0nfmzr
Units: milliBecquerel per cubic meter (mBq/m^3)
Description: <p>One standard deviation for Be_7_A_T_CONC_HIVOL_0nfmzr</p>
http://lod.bco-dmo.org/id/dataset-parameter/927606.rdf
Name: Flag_Be_7_A_T_CONC_HIVOL_0nfmzr
Units: unitless
Description: <p>Quality flag for Be_7_A_T_CONC_HIVOL_0nfmzr. SeaDataNet flag scheme.</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
7671
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/24d832ae-2337-4a42-b935-1582fda969c7/content
download
https://doi.org/10.26008/1912/bco-dmo.927568.1
download
onLine
dataset
<p><strong>Seawater sampling:</strong> The procedures used on the <span style="font-size:13px">GS02 SWINGS cruise&nbsp;</span>were identical to those described for the GEOTRACES GP15 and GP16 cruises by Kadko et al. (2017, 2020)<span style="font-size:13px">, except that a Grundfos submersible centrifugal pump rather than a deck mounted pump was used to collect the seawater</span>. <span style="font-size:13px">Briefly, the submersible pump was attached to a 1.5-inch PVC hose and lowered to selected depths.&nbsp;400 to 700 liters (L)&nbsp;of seawater were delivered to large plastic tanks in this manner. Beryllium-7 (Be-7)&nbsp;was then extracted by pumping the seawater through 200 grams (g) of iron impregnated acrylic fibers at a rate of ~10 liters per minute (Lai&nbsp;et al., 1988; Krishnaswami et al., 1972; Lee et al., 1991). A portable profiling CTD (model: Seabird SBE 19Plus) was attached to the end of the hose so that temperature, depth, and salinity could be recorded.</span></p>
<p><strong>Aerosol sampling:</strong> Aerosol samples were collected according to protocols set forth in the GEOTRACES cookbook using a Tisch TE-5170V-BL high-volume aerosol sampler modified to collect 12 replicate samples on 47-millimeter (mm) diameter Whatman-41 (W-41) filters (Wallace et al, 1977; Baker et al., 2006). In order to minimize filter blanks, the W-41 filters were pre-cleaned inside a HEPA-filtered laminar flow hood using three cycles of leaching with 0.5M HCl (Optima) and then rinsing with ultra-high purity water (UHP water) according to trace element protocols (Morton et al., 2013; similar to Baker et al., 2006). Sector control, which was accomplished via a Campbell Scientific data logger, was set such that the sampler would only operate during winds of &gt;0.5 meters per second (m/s) and from ± 60° of the ship's bow to avoid sampling air influenced by the ship's exhaust. Three replicate filters from each deployment, placed in PetriSlides, were sent to FIU for Be-7 analysis.</p>
<p><strong>Analytical procedures:</strong> Samples were counted for Be-7 onshore using low background germanium gamma detectors at Florida International University (FIU). FIU's facilities include four HPGe detectors: three Ortec Coaxial GEM series detectors and one Canberra Broad Energy gamma detector. For aerosols, the three replicate 47 mm filters were stacked in a Petri dish for counting. For seawater, the fibers were dried and then ashed. The powder remaining after ashing was pressed into a 5.8-centimeter (cm) diameter pellet, and the pellet thickness was measured. The iron hydroxide pellet was placed in a Petri dish for gamma counting. Be-7 has a readily identifiable gamma peak at 478 kiloelectron volts (keV), and the spectra were evaluated using Maestro (Ortec) or Genie 2000 (Canberra) software.</p>
<p>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 W-41 filters (for aerosol samples) and pellets of various thicknesses (for seawater) to derive a calibration curve using peaks associated with following isotopes: Sn-113 @ 392 keV, Sr-85 @ 514 keV, Cs-137 @ 662 keV. The counting efficiencies of the four detectors ranges from 0.05686 to 0.11415 for Be-7 on aerosol filters. And for the seawater pellets from this cruise, the counting efficiencies ranged from 0.03480 to 0.08590.</p>
Specified by the Principal Investigator(s)
<p><strong>Data Processing:</strong><br />
Be-7 has a readily identifiable gamma peak at 478 keV, and the spectra were evaluated using Maestro (Ortec) or Genie 2000 (Canberra) software.</p>
<p>Reported Be-7 activities were corrected to the time of sampling.&nbsp; The calculation is as follows:</p>
<p>[Be-7, dpm m-3] = {cpm • ct • λ • exp(λ•d) } / {CE • PE • FE • V • [1-exp(-λ•ct)]},&nbsp; where:</p>
<p>cpm = background corrected counts per minute for the region of interest (ROI);<br />
ct = count time (days);<br />
λ = the Be-7 radioactive decay constant (0.013 day-1);<br />
CE = counting efficiency;<br />
PE = photon emission probability (0.104 for Be-7);<br />
FE – fiber extraction efficiency (92 ±3%);<br />
V= volume (m-3);<br />
d = time from sample collection to start of count (days)</p>
<p>The error (in counts) associated with each measurement is the statistical counting error (σ) and the uncertainty in the blank, √(σ2 + σb2), 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><br />
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:<br />
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; (see attached Supplemental File for detection limits for Be-7 samples)<br />
7 = value in excess;<br />
8 = interpolated value;<br />
9 = missing value;<br />
A = value phenomenon uncertain.</p>
<p>Intercalibration and detection limits are provided in the attached Supplemental File "MD229_Intercal_and_Detection_Limits_Be7.pdf".</p>
Specified by the Principal Investigator(s)
- Imported original file "MD229_7Be_Data.xlsx" into the BCO-DMO system.
- Renamed fields to comply with BCO-DMO naming conventions.
- Created ISO 8601 date-time fields.
- Converted date columns to YYYY-MM-DD.
- Removed empty columns (Gear_ID, Rosette_Position).
- Saved the final file as "927568_v1_gs02_beryllium-7.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 TE-5170V-BL high volume aerosol sampler
Tisch TE-5170V-BL high volume aerosol sampler
PI Supplied Instrument Name: Tisch TE-5170V-BL high volume aerosol sampler 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/
Seabird SBE 19Plus
Seabird SBE 19Plus
PI Supplied Instrument Name: Seabird SBE 19Plus Instrument Name: CTD Sea-Bird SBE SEACAT 19plus Instrument Short Name:Sea-Bird SEACAT 19 Plus Instrument Description: Self contained self powered CTD profiler. Measures conductivity, temperature and pressure in both profiling (samples at 4 scans/sec) and moored (sample rates of once every 5 seconds to once every 9 hours) mode. Available in plastic or titanium housing with depth ranges of 600m and 7000m respectively. Minature submersible pump provides water to conductivity cell.
Campbell Scientific data logger
Campbell Scientific data logger
PI Supplied Instrument Name: Campbell Scientific data logger 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:FIU's facilities include four HPGe detectors: three Ortec Coaxial GEM series detectors and one Canberra Broad Energy gamma detector. The detectors were calibrated for the each geometry by adding a commercially prepared mixed isotope solution of known gamma activities (Eckert & Ziegler Mixed Nuclide Solution 7500) to three W-41 filters (for aerosol samples) and pellets of various thicknesses (for seawater) to derive a calibration curve using peaks associated with following isotopes: Sn-113 @ 392 keV, Sr-85 @ 514 keV, Cs-137 @ 662 keV. The counting efficiencies of the four detectors ranges from 0.05686 to 0.11415 for Be-7 on aerosol filters. And for the seawater pellets from this cruise, the counting efficiencies ranged from 0.03480 to 0.08590. 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.
Grundfos submersible centrifugal pump
Grundfos submersible centrifugal pump
PI Supplied Instrument Name: Grundfos submersible centrifugal pump PI Supplied Instrument Description:Grundfos SP2A-48 pump with Grundfos submersible motor (2.2 KW, 400 V) 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: MD229
MD229
R/V Marion-Dufresne
Community Standard Description
International Council for the Exploration of the Sea
R/V Marion-Dufresne
vessel
MD229
Catherine Jeandel
Laboratoire d’Etudes en Géophysique et Océanographie Spatiales
R/V Marion-Dufresne
Community Standard Description
International Council for the Exploration of the Sea
R/V Marion-Dufresne
vessel