http://lod.bco-dmo.org/id/dataset/946249
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2024-12-18
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Depth profiles of the isotopic composition (δ30Si) of silicon within dissolved silicic acid from samples collected on Leg 2 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018
2024-12-19
publication
2024-12-19
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2024-12-19
publication
https://doi.org/10.26008/1912/bco-dmo.946249.1
Mark A. Brzezinski
University of California-Santa Barbara
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: Brzezinski, M. A. (2024) Depth profiles of the isotopic composition (δ30Si) of silicon within dissolved silicic acid from samples collected on Leg 2 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-12-19 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.946249.1 [access date]
GP15 delta30Si Leg 2 Dataset Description: Methods and Sampling: <p>Seawater samples for δ30Si measurements were collected using the Oceanographic Data Facilitiy's (ODF, Scripps Institution of Oceanography) CTD-rosette mounted with Niskin samplers and a Sea-Bird Electronics CTD (SBE9plus). Seawater was gravity-filtered into polypropylene containers through in-line Supor filter capsules (0.8/0.45-micrometer (µm)) attached directly to each Niskin bottle. Sample bottles were capped and stored without preservative in the dark.</p>
<p>Back in the laboratory, the silicon from seawater was precipitated off as trimethylamine silicomolybdate using a high-purity triethlyamine ammonium molybdate solution (TEA-Moly). The precipitate was isolated by filtration onto a polycarbonate filter and purified by high-temperature combustion to produce solid silicon dioxide. SiO2 was then converted to solid Cs2SiF6 by dissolution in HF and addition of CsCl. The Cs2SiF6 was rinsed with ethanol, dried, and dissolved in high purity (&gt;18MΩ) water. BaSiF6 was precipitated by the addition of BaCl, rinsed with ethanol and dried.</p>
<p>Isotopic ratio analysis was performed using a Nu Perspective isotope ratio mass spectrometer equipped with a Nu Sil inlet system. Samples of BaSiF6 are loaded into sample vials that are placed in a sample carousel in the Nu Sil. Samples are sequentially heated to 590 degrees Celsius (°C) to evolve.</p>
<p>Isotope delta values are normalized against the international standard NBS28.</p>
<p>Methods are further described in the Supplemental File "Natural_Abundance_Protocol.pdf".</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1732139 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1732139
completed
Mark A. Brzezinski
University of California-Santa Barbara
805-893-7061
UCSB Marine Science Institute Bldg 520 Rm 4002 Fl 4L
Santa Barbara
CA
93106
USA
mark.brzezinski@lifesci.ucsb.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Station_ID
Start_Date_UTC
Start_Time_UTC
Start_ISO_DateTime_UTC
Start_Latitude
Start_Longitude
Event_ID
Sample_ID
Sample_Depth
SILICATE_30_28_D_DELTA_BOTTLE_1foxwp
SD1_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp
Flag_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp
Nu Perspective isotope ratio mass spectrometer
Niskin bottles on the GEOTRACES ODF CTD-rosette system
theme
None, User defined
station
date
time of day
ISO_DateTime_UTC
latitude
longitude
event
sample identification
water pressure
Silicon
quality flag
featureType
BCO-DMO Standard Parameters
Isotope-ratio Mass Spectrometer
Niskin bottle
instrument
BCO-DMO Standard Instruments
RR1815
service
Deployment Activity
Hilo, HI to Papeete, French Polynesia
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 Pacific Meridional Transect (GP15)
http://www.geotraces.org/
US GEOTRACES Pacific Meridional Transect (GP15)
<p>A 60-day research cruise took place in 2018 along a transect form Alaska to Tahiti at 152° W. A description of the project titled "<em>Collaborative Research: Management and implementation of the US GEOTRACES Pacific Meridional Transect</em>", funded by NSF, is below. Further project information is available on the <a href="https://www.geotraces.org/" target="_blank">US GEOTRACES website</a> and on the <a href="https://geotraces-gp15.com/" target="_blank">cruise blog</a>. A detailed <a href="https://datadocs.bco-dmo.org/docs/geotraces/GEOTRACES_PMT/casciotti/data_docs/GP15_Cruise_Report_with_ODF_Report.pdf" target="_blank">cruise report is also available</a> as a PDF.</p>
<p><em>Description from NSF award abstract:</em><br />
GEOTRACES is a global effort in the field of Chemical Oceanography in which the United States plays a major role. The goal of the GEOTRACES program is to understand the distributions of many elements and their isotopes in the ocean. Until quite recently, these elements could not be measured at a global scale. Understanding 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. For example, many "trace elements" (elements that are present in very low amounts) are also important for life, and their presence or absence can play a vital role in the population of marine ecosystems. This project will launch the next major U.S. GEOTRACES expedition in the Pacific Ocean between Alaska and Tahiti. The award made here would support all of the major infrastructure for this expedition, including the research vessel, the sampling equipment, and some of the core oceanographic measurements. This project will also support the personnel needed to lead the expedition and collect the samples.</p>
<p>This project would support the essential sampling operations and infrastructure for the U.S. GEOTRACES Pacific Meridional Transect along 152° W to support a large variety of individual science projects on trace element and isotope (TEI) biogeochemistry that will follow. Thus, the major objectives of this management proposal are: (1) plan and coordinate a 60 day research cruise in 2018; (2) obtain representative samples for a wide variety of TEIs using a conventional CTD/rosette, GEOTRACES Trace Element Sampling Systems, and in situ pumps; (3) acquire conventional CTD hydrographic data along with discrete samples for salinity, dissolved oxygen, algal pigments, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES intercalibration protocols; (5) prepare and deliver all hydrographic data to the GEOTRACES Data Assembly Centre (via the US BCO-DMO data center); and (6) coordinate all cruise communications between investigators, including preparation of a hydrographic report/publication. This project would also provide baseline measurements of TEIs in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on TEIs in the water column is one that could be uniquely assessed by the GEOTRACES community. In support of efforts to communicate the science to a wide audience the investigators will recruit an early career freelance science journalist with interests in marine science and oceanography to participate on the cruise and do public outreach, photography and/or videography, and social media from the ship, as well as to submit articles about the research to national media. The project would also support several graduate students.</p>
U.S. GEOTRACES PMT
largerWorkCitation
project
US GEOTRACES Pacific Meridional Transect (GP-15): Resolving Silicon Isotope Anomalies in the Northeast Pacific
https://osprey.bco-dmo.org/project/946239
US GEOTRACES Pacific Meridional Transect (GP-15): Resolving Silicon Isotope Anomalies in the Northeast Pacific
<p><em>NSF Award Abstract:</em><br />
This project will examine the distribution of isotopes of the element silicon in the Pacific Ocean to gain insights into processes that control the movement of silicon through the global ocean. Such studies are motivated by the fact that the silicon that is dissolved in seawater supports the growth of diatoms. Diatoms are microscopic algae that use silicon to produce ornately sculpted shells called frustules. Diatoms are unique in that they are the only major group of marine photosynthetic microbes that need silicon in order to grow. Diatoms are responsible for 20% of the total photosynthesis on Earth so we can each thank a diatom for every fifth breath of oxygen that we breathe. The sheer scale of their contribution makes understanding what controls their distribution and abundance important for the ecology and chemistry of the oceans and for society. Their need for silicon means that the amount of silicon dissolved in seawater can control where diatoms grow and how many are produced. Diatoms obtain silicon, and other nutrient fertilizer, when currents bring deep waters that are rich in these nutrients to the surface ocean. This project will investigate how the stable isotopic composition of dissolved silicon varies in the Pacific Ocean. Why bother with isotopes? It turns out that diatoms preferentially use lighter isotopes of silicon when building their frustules. This produces signals in diatom frustules and in the dissolved silicon in the sea that allows isotopes to be used to reconstruct diatom productivity in the past. The isotopic composition of the dissolved silicon in deep ocean waters is different in different ocean basins. These differences in isotopes of silicon in deep waters appear to be systematic and are tied to the movement of currents in the deep sea. Once these patterns are understood evaluations of diatom productivity based on isotopes will improve enormously. Testing the relationship between isotopes of silicon and the water masses that comprise the deep circulation of the global ocean is a major goal of this study.</p>
<p>This study will take place as part of the 2018 GEOTRACES expedition from Alaska to Tahiti. This expedition will sample several important water masses. The deep waters of the northeast Pacific are among the most puzzling relative to current understanding of the processes controlling Si isotope distributions. Deep waters of the north Pacific possess the highest concentration of dissolved silicon and oldest waters at the "end" of the global deep water circulation. Moreover, the northeast Pacific is of particular interest as it contains what could be the largest silicon isotope anomaly in the global ocean, known as the North Pacific Silicic Acid Plume. The plume, as its name implies, consists of a tongue of elevate dissolved silicon that extends from the Cascadia Basin off North America nearly to Japan. The limited data available so far implies that isotope patterns across the plume are the opposite of model predictions challenging our current understanding of controls on Si isotope distributions. Elsewhere, the planned expedition will intersect key water masses including surface waters, North Pacific Intermediate Water, North Pacific Deep Water, and at the southern extreme of the section, Antarctic Intermediate Water and Circumpolar Deep Water allowing tests of hypotheses on how silicon isotope relate to the distribution of deep water masses in the Pacific. Examining these features will involve sampling seawater using the logistical support from the GEOTRACES management team. Seawater will be collected from the surface to near ocean bottom at twelve stations between Tahiti and Alaska targeting key water masses and the North Pacific Plume. Samples of diatom frustules from throughout the water column will be collected at three stations to explore fractionation of silicon during the dissolution of diatoms frustules. This project will also provide partial support for a postdoctoral scholar who will both participate in the science and also collaborate with the principal investigator on disseminating the discoveries to the public.</p>
PMT Si
largerWorkCitation
project
eng; USA
oceans
Hilo, HI to Papeete, French Polynesia
-152.0082
-151.9862
-20
17.5
2018-10-26
2018-11-23
Pacific Meridional Transect along 152W (GP15)
0
BCO-DMO catalogue of parameters from Depth profiles of the isotopic composition (δ30Si) of silicon within dissolved silicic acid from samples collected on Leg 2 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018
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/946306.rdf
Name: Station_ID
Units: unitless
Description: <p>sampling station</p>
http://lod.bco-dmo.org/id/dataset-parameter/946307.rdf
Name: Start_Date_UTC
Units: unitless
Description: <p>cast date</p>
http://lod.bco-dmo.org/id/dataset-parameter/946308.rdf
Name: Start_Time_UTC
Units: unitless
Description: <p>cast time (UTC)</p>
http://lod.bco-dmo.org/id/dataset-parameter/946309.rdf
Name: Start_ISO_DateTime_UTC
Units: unitless
Description: <p>cast date and time (UTC) in ISO 8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/946310.rdf
Name: Start_Latitude
Units: decimal degrees
Description: <p>cast latitude (negative values = South)</p>
http://lod.bco-dmo.org/id/dataset-parameter/946311.rdf
Name: Start_Longitude
Units: decimal degrees
Description: <p>cast longitude (negative values = West)</p>
http://lod.bco-dmo.org/id/dataset-parameter/946312.rdf
Name: Event_ID
Units: unitless
Description: <p>GEOTRACES event number</p>
http://lod.bco-dmo.org/id/dataset-parameter/946313.rdf
Name: Sample_ID
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/946314.rdf
Name: Sample_Depth
Units: decibars (db)
Description: <p>Pressure at depth of sample collected; obtained from CTD data provided by from chief scientist</p>
http://lod.bco-dmo.org/id/dataset-parameter/946315.rdf
Name: SILICATE_30_28_D_DELTA_BOTTLE_1foxwp
Units: per mil
Description: <p>mean delta30Si(OH)4 relative to the NBS28 standard</p>
http://lod.bco-dmo.org/id/dataset-parameter/946316.rdf
Name: SD1_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp
Units: per mil
Description: <p>Standard deviation of SILICATE_30_28_D_DELTA_BOTTLE_1foxwp</p>
http://lod.bco-dmo.org/id/dataset-parameter/946317.rdf
Name: Flag_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp
Units: unitless
Description: <p>Quality flag for SILICATE_30_28_D_DELTA_BOTTLE_1foxwp</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
27575
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/f753100c-f545-475b-a7bf-623a14092131/content
download
https://doi.org/10.26008/1912/bco-dmo.946249.1
download
onLine
dataset
<p>Seawater samples for δ30Si measurements were collected using the Oceanographic Data Facilitiy's (ODF, Scripps Institution of Oceanography) CTD-rosette mounted with Niskin samplers and a Sea-Bird Electronics CTD (SBE9plus). Seawater was gravity-filtered into polypropylene containers through in-line Supor filter capsules (0.8/0.45-micrometer (µm)) attached directly to each Niskin bottle. Sample bottles were capped and stored without preservative in the dark.</p>
<p>Back in the laboratory, the silicon from seawater was precipitated off as trimethylamine silicomolybdate using a high-purity triethlyamine ammonium molybdate solution (TEA-Moly). The precipitate was isolated by filtration onto a polycarbonate filter and purified by high-temperature combustion to produce solid silicon dioxide. SiO2 was then converted to solid Cs2SiF6 by dissolution in HF and addition of CsCl. The Cs2SiF6 was rinsed with ethanol, dried, and dissolved in high purity (&gt;18MΩ) water. BaSiF6 was precipitated by the addition of BaCl, rinsed with ethanol and dried.</p>
<p>Isotopic ratio analysis was performed using a Nu Perspective isotope ratio mass spectrometer equipped with a Nu Sil inlet system. Samples of BaSiF6 are loaded into sample vials that are placed in a sample carousel in the Nu Sil. Samples are sequentially heated to 590 degrees Celsius (°C) to evolve.</p>
<p>Isotope delta values are normalized against the international standard NBS28.</p>
<p>Methods are further described in the Supplemental File "Natural_Abundance_Protocol.pdf".</p>
Specified by the Principal Investigator(s)
<p>Depths (represented as pressure in decibars), date-times, and locations (lat/lon) in the dataset were obtained from the cruise's CTD bottle file based on the unique GEOTRACES sample number for each sample. However, there were sometimes multiple bottles tripped for a single GEOTRACES sample number. In those cases, if the Niskin/Go-Flo number was also recorded by the data provider, the metadata information for that bottle was used. If the Niskin/Go-Flo number was not recorded along with the GEOTRACES number, the rosette bottle number that had both O2 and salinity data was used to obtain the metadata information for the sample, as advised by the cruise's lead PIs.</p>
<p><strong>Quality flags</strong> were assigned according to the following definitions:</p>
<p>1 = Good; passed documented required QC tests.<br />
2 = Not evaluated, not available or unknown. Used for data when no QC test performed or the information on quality is not available.<br />
3 = Questionable/suspect; failed non-critical documented metric or subjective test(s).<br />
4 = Bad; failed critical documented QC test(s) or as assigned by the data provider.<br />
9 = Missing data. Used as place holder when data are missing.</p>
Specified by the Principal Investigator(s)
- Imported original file "RR1815_silicon.xlsx" into the BCO-DMO system.
- Marked "nd", "no data", "#N/A" , and "small n" as missing data values (missing data values are empty/blank in the final CSV file).
- Renamed fields to comply with BCO-DMO naming conventions.
- Created date-time field in ISO 8601 format.
- Rounded values in the SILICATE_30_28_D_DELTA_BOTTLE_1foxwp and SD1_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp columns to 3 decimal places.
- Removed the following empty columns: End_Date_UTC, End_Time_UTC, End_Latitude, End_Longitude.
- Saved the final file as "946249_v1_gp15_delta30si_leg2.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
Nu Perspective isotope ratio mass spectrometer
Nu Perspective isotope ratio mass spectrometer
PI Supplied Instrument Name: Nu Perspective isotope ratio mass spectrometer Instrument Name: Isotope-ratio Mass Spectrometer Instrument Short Name:IR Mass Spec; IRMS Instrument Description: The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
Niskin bottles on the GEOTRACES ODF CTD-rosette system
Niskin bottles on the GEOTRACES ODF CTD-rosette system
PI Supplied Instrument Name: Niskin bottles on the GEOTRACES ODF CTD-rosette system 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/
Cruise: RR1815
RR1815
R/V Roger Revelle
Community Standard Description
International Council for the Exploration of the Sea
R/V Roger Revelle
vessel
RR1815
Gregory A. Cutter
Old Dominion University
https://datadocs.bco-dmo.org/docs/geotraces/GEOTRACES_PMT/casciotti/data_docs/GP15_Cruise_Report_with_ODF_Report.pdf
Report describing RR1815
R/V Roger Revelle
Community Standard Description
International Council for the Exploration of the Sea
R/V Roger Revelle
vessel