http://lod.bco-dmo.org/id/dataset/933645
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
2024-07-23
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Nitrous oxide (N2O) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013
2024-07-24
publication
2024-07-24
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2024-07-31
publication
https://doi.org/10.26008/1912/bco-dmo.933645.1
Karen L. Casciotti
Stanford 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: Casciotti, K. L., Gluschankoff, N. (2024) Nitrous oxide (N2O) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-07-24 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.933645.1 [access date]
GP16 N2O Isotopes and Concentrations Dataset Description: Methods and Sampling: <p>Water samples were collected at discrete depths using Niskin bottle type rosette samplers and an SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA). This dataset's samples were collected from Niskin bottles into 160-milliliter (mL) glass serum vials, killed with saturated mercuric chloride, and crimp sealed with gray butyl stoppers. Prior to sealing, ~1 mL of sample was removed to allow room for sample expansion and to prevent the sample vessel from shattering upon warming.</p>
<p>In all cases, samples were extracted and analyzed using a custom automated purge and trap inlet system and normalized to an injection of calibrated pure N2O reference gas introduced prior to the elution of each sample peak (McIlvin &amp; Casciotti, 2010). Isotope ratios were referenced initially to the calibrated N2O reference tank to create a set of 'ratio of ratios' (³¹Rsample/³¹Rreference, ⁴⁵Rsample/⁴⁵Rreference, ⁴⁶Rsample/⁴⁶Rreference). Next, the data were size corrected in reference to a calibrated 20 volt-second (Vs) peak area for a mass-to-charge ratio of 44 (m/z 44). The size-corrected data were then corrected using a log-scaled normalization based on three isotopically distinct reference materials with known isotopocule compositions that were analyzed alongside the seawater samples (Kelly et al. 2023). Finally, 'scrambling coefficients' were applied to the isotopomer data to correct the measured 15Ra and 15Rb for the rearrangement of nitrogen atoms in N2O when the gas is ionized in the mass spectrometer ion source (Frame et al., 2014; Frame &amp; Casciotti, 2010; Kelly et al., 2021). The isotope ratios of N and O atoms in N2O, ¹⁵Rsample or ¹⁸Rsample, respectively, are expressed in delta notation (δ), where the δ15N and δ18O are defined relative to the isotope ratios of certified standards: δ15N or δ18O = (Rsample/Rstandard - 1) x1000. The Rstandard values used for δ15N and δ18O are the ratios of 15N/14N and 18O/16O in atmospheric N2 and Vienna Standard Mean Ocean Water (VSMOW), respectively.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1233339 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1233339
completed
Karen L. Casciotti
Stanford University
650-721-5545
Department of Environmental Earth System Science 473 Via Ortega, Y2E2 Building, Room 140
Stanford
CA
94305
USA
kcasciotti@stanford.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
STNNBR
GEOTRC_EVENTNO
GEOTRC_SAMPNO
DATE
LATITUDE
LONGITUDE
CTDPRS
DEPTH
CTDTMP
CTDSAL
N2O_ALPHA_15_14_D_DELTA_BOTTLE_mmz7wk
SD1_N2O_ALPHA_15_14_D_DELTA_BOTTLE_mmz7wk
N2O_BETA_15_14_D_DELTA_BOTTLE
SD1_N2O_BETA_15_14_D_DELTA_BOTTLE
N2O_SP_15_14_D_DELTA_BOTTLE
SD1_N2O_SP_15_14_D_DELTA_BOTTLE
N2O_15_14_D_DELTA_BOTTLE_f2vswm
SD1_N2O_15_14_D_DELTA_BOTTLE_f2vswm
N2O_17_16_D_DELTA_BOTTLE
SD1_N2O_17_16_D_DELTA_BOTTLE
N2O_18_16_D_DELTA_BOTTLE_xkal8d
SD1_N2O_18_16_D_DELTA_BOTTLE_xkal8d
N2O_D_CONC_BOTTLE_ahlf1q
SD1_N2O_D_CONC_BOTTLE_ahlf1q
N2O_Flag
CASTNO
OXYGEN
SILCATE
NITRATE
NITRITE
PHOSPHATE
custom automated purge and trap inlet system
SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA)
Thermo Fisher Delta V Plus Isotope Ratio Mass Spectrometer
Niskin bottle type rosette samplers
theme
None, User defined
station
event
sample identification
date
latitude
longitude
water pressure
depth
water temperature at measurement depth
salinity
d15N
Nitrous Oxide
delta17O
oxygen 16 to oxygen 18 ratio
quality flag
cast
dissolved Oxygen
Silicate, Si(OH)4, silicic acid
Nitrate
Nitrite
phosphate
featureType
BCO-DMO Standard Parameters
Automated Purge and Trap System
CTD Sea-Bird
Isotope-ratio Mass Spectrometer
Niskin bottle
instrument
BCO-DMO Standard Instruments
TN303
service
Deployment Activity
Eastern Tropical Pacific - Transect from Peru to Tahiti
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
U.S. GEOTRACES East Pacific Zonal Transect (GP16)
http://www.geotraces.org/
U.S. GEOTRACES East Pacific Zonal Transect (GP16)
<p><strong>From the NSF Award Abstract</strong><br />
The mission of the International GEOTRACES Program (<a href="https://www.geotraces.org/" target="_blank">https://www.geotraces.org/</a>), of which the U.S. chemical oceanography research community is a founding member, is "to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions" (GEOTRACES Science Plan, 2006). In the United States, ocean chemists are currently in the process of organizing a zonal transect in the eastern tropical South Pacific (ETSP) from Peru to Tahiti as the second cruise of the U.S.GEOTRACES Program. This Pacific section includes a large area characterized by high rates of primary production and particle export in the eastern boundary associated with the Peru Upwelling, a large oxygen minimum zone that is a major global sink for fixed nitrogen, and a large hydrothermal plume arising from the East Pacific Rise. This particular section was selected as a result of open planning workshops in 2007 and 2008, with a final recommendation made by the U.S.GEOTRACES Steering Committee in 2009. It is the first part of a two-stage plan that will include a meridional section of the Pacific from Tahiti to Alaska as a subsequent expedition.</p>
<p>This award provides funding for management of the U.S.GEOTRACES Pacific campaign to a team of scientists from the University of Southern California, Old Dominion University, and the Woods Hole Oceanographic Institution. The three co-leaders will provide mission leadership, essential support services, and management structure for acquiring the trace elements and isotopes samples listed as core parameters in the International GEOTRACES Science Plan, plus hydrographic and nutrient data needed by participating investigators. With this support from NSF, the management team will (1) plan and coordinate the 52-day Pacific research cruise described above; (2) obtain representative samples for a wide variety of trace metals of interest using conventional CTD/rosette and GEOTRACES Sampling Systems; (3) acquire conventional JGOFS/WOCE-quality hydrographic data (CTD, transmissometer, fluorometer, oxygen sensor, etc) along with discrete samples for salinity, dissolved oxygen (to 1 uM detection limits), plant pigments, redox tracers such as ammonium and nitrite, 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-type data to the GEOTRACES Data Center (and US data centers); and (6) coordinate cruise communications between all participating investigators, including preparation of a hydrographic report/publication.</p>
<p>Broader Impacts: The project is part of an international collaborative program that has forged strong partnerships in the intercalibration and implementation phases that are unprecedented in chemical oceanography. The science product of these collective missions will enhance our ability to understand how to interpret the chemical composition of the ocean, and interpret how climate change will affect ocean chemistry. Partnerships include contributions to the infrastructure of developing nations with overlapping interests in the study area, in this case Peru. There is a strong educational component to the program, with many Ph.D. students carrying out thesis research within the program.</p>
<p><em>Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]</em><br />
<a href="http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/GEOTRACES_EPZT_TN303_CruiseTrack.png" target="_blank"><img alt="" src="https://datadocs.bco-dmo.org/d3/data_docs/GEOTRACES/EPZT/GEOTRACES_EPZT_TN303_CruiseTrack.png" /></a></p>
U.S. GEOTRACES EPZT
largerWorkCitation
project
GEOTRACES Peru-Tahiti Nitrogen Isotope Measurements
https://osprey.bco-dmo.org/project/650090
GEOTRACES Peru-Tahiti Nitrogen Isotope Measurements
<p><strong>Description from NSF award abstract:</strong><br />
Nitrogen (N) is an essential macronutrient whose availability can limit primary production and the capacity of the biological pump to export carbon from the surface ocean on seasonal, annual, decadal, and millennial timescales. The inventory of fixed (bioavailable) N in the ocean is driven by biological processes such as nitrogen fixation, denitrification, and anaerobic ammonia oxidation (anammox). Water column oxygen deficient zones (ODZs) are important sites for fixed N loss, as well as N2O production, and they are projected to expand and intensify in the coming years as global warming increases ocean stratification and decreases ventilation. It is important to understand the distribution of nitrate, nitrite, and N2O isotopes in relation to current ocean conditions of oxygen and trace element availability order to interpret past and future changes in nitrate signals.</p>
<p>In this project, a team of researchers from Stanford University, University of Massachusetts at Dartmouth, and Brown University will measure the nitrogen- and oxygen-isotopic composition (del15N and del18O) of nitrate, nitrite, and nitrous oxide in seawater samples collected along the GEOTRACES Pacific Peru-Tahiti Section. Values of del15N and del18O will also be measured in nitrate from aerosol and rain samples to inform our interpretation of the N isotope budget and isotopic gradients within the tropical South Pacific. Finally, N2/Ar and N2 del15N will be determined to close the N mass and isotope budgets. Nitrate del15N is a GEOTRACES "core parameter" that will complement other measurements, such as bioactive trace element concentrations and speciation, Si isotope variations, as well as redox and productivity proxies.</p>
<p>The GEOTRACES Peru-Tahiti section provides a rare opportunity to track the fate of the isotopic signals of N loss from one of the largest water column ODZs. Furthermore, little is known about the effect of N recycling through hydrothermal vents on nitrate isotopes in the deep ocean, and this section will allow quantitative tracking of this input. Together, these measurements will yield insight into the relative rates of modern N cycle processes and will provide background information for paleoceanographic applications.</p>
EPZT Nitrogen Isotopes
largerWorkCitation
project
eng; USA
oceans
Eastern Tropical Pacific - Transect from Peru to Tahiti
-152
-77.38
-16
-10.5
2013-10-29
2013-12-18
From projects that focused on the following 2 locations: 1. Eastern Tropical Pacific - Transect from Peru to Tahiti (GP16) 2. East Pacific Zonal Transect
0
BCO-DMO catalogue of parameters from Nitrous oxide (N2O) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013
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/933668.rdf
Name: STNNBR
Units: unitless
Description: <p>Station number</p>
http://lod.bco-dmo.org/id/dataset-parameter/933669.rdf
Name: GEOTRC_EVENTNO
Units: unitless
Description: <p>GEOTRACES event number</p>
http://lod.bco-dmo.org/id/dataset-parameter/933670.rdf
Name: GEOTRC_SAMPNO
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/933671.rdf
Name: DATE
Units: unitless
Description: <p>Date of sampling</p>
http://lod.bco-dmo.org/id/dataset-parameter/933672.rdf
Name: LATITUDE
Units: decimal degrees
Description: <p>Latitude; South is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/933673.rdf
Name: LONGITUDE
Units: decimal degrees
Description: <p>Longitude; West is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/933674.rdf
Name: CTDPRS
Units: decibars
Description: <p>Pressure</p>
http://lod.bco-dmo.org/id/dataset-parameter/933675.rdf
Name: DEPTH
Units: meters (m)
Description: <p>Depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/933676.rdf
Name: CTDTMP
Units: degrees Celsius
Description: <p>Temperature</p>
http://lod.bco-dmo.org/id/dataset-parameter/933677.rdf
Name: CTDSAL
Units: PSU
Description: <p>Salinity</p>
http://lod.bco-dmo.org/id/dataset-parameter/933678.rdf
Name: N2O_ALPHA_15_14_D_DELTA_BOTTLE_mmz7wk
Units: permille
Description: <p>Average d15N alpha (inner nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation. (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933679.rdf
Name: SD1_N2O_ALPHA_15_14_D_DELTA_BOTTLE_mmz7wk
Units: permille
Description: <p>Standard deviation d15N alpha (inner nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation. (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933680.rdf
Name: N2O_BETA_15_14_D_DELTA_BOTTLE
Units: permille
Description: <p>Average d15N beta (outer nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation.</p>
http://lod.bco-dmo.org/id/dataset-parameter/933681.rdf
Name: SD1_N2O_BETA_15_14_D_DELTA_BOTTLE
Units: permille
Description: <p>Standard deviation d15N beta (outer nitrogen atom) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation.</p>
http://lod.bco-dmo.org/id/dataset-parameter/933682.rdf
Name: N2O_SP_15_14_D_DELTA_BOTTLE
Units: permille
Description: <p>Average N2O SP (site preference) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation.</p>
http://lod.bco-dmo.org/id/dataset-parameter/933683.rdf
Name: SD1_N2O_SP_15_14_D_DELTA_BOTTLE
Units: permille
Description: <p>Standard deviation N2O SP (site preference) in N2O in reference to atmospheric nitrogen gas, expressed in permille notation.</p>
http://lod.bco-dmo.org/id/dataset-parameter/933684.rdf
Name: N2O_15_14_D_DELTA_BOTTLE_f2vswm
Units: permille
Description: <p>Average d15N bulk in N2O in reference to atmospheric nitrogen gas, expressed in permille notation. (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933685.rdf
Name: SD1_N2O_15_14_D_DELTA_BOTTLE_f2vswm
Units: permille
Description: <p>Standard deviation d15N bulk in N2O in reference to atmospheric nitrogen gas, expressed in permille notation. (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933686.rdf
Name: N2O_17_16_D_DELTA_BOTTLE
Units: permille
Description: <p>Average d17O in N2O in reference to VSMOW, expressed in permille notation</p>
http://lod.bco-dmo.org/id/dataset-parameter/933687.rdf
Name: SD1_N2O_17_16_D_DELTA_BOTTLE
Units: permille
Description: <p>Standard deviation d17O in N2O in reference to VSMOW, expressed in permille notation</p>
http://lod.bco-dmo.org/id/dataset-parameter/933688.rdf
Name: N2O_18_16_D_DELTA_BOTTLE_xkal8d
Units: permille
Description: <p>Average d18O in N2O in reference to VSMOW, expressed in permille notation. (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933689.rdf
Name: SD1_N2O_18_16_D_DELTA_BOTTLE_xkal8d
Units: permille
Description: <p>Standard deviation d18O in N2O in reference to VSMOW, expressed in permille notation. (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933690.rdf
Name: N2O_D_CONC_BOTTLE_ahlf1q
Units: nanomolar (nmol/L)
Description: <p>Average N2O concentration measurement in nanomolar (nmol/L). (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933691.rdf
Name: SD1_N2O_D_CONC_BOTTLE_ahlf1q
Units: nanomolar (nmol/L)
Description: <p>Error in N2O concentration measurement in nanomolar (nmol/L). (Code at the end of column name is GEOTRACES DOoR identifier.)</p>
http://lod.bco-dmo.org/id/dataset-parameter/933692.rdf
Name: N2O_Flag
Units: unitless
Description: <p>N2O isotope and concentration measurement data quality control flag from SeaDataNet: 1 = good value; 2 = probably good value; 3 = probably bad value; 4 = bad value; 9 = missing value.</p>
http://lod.bco-dmo.org/id/dataset-parameter/933693.rdf
Name: CASTNO
Units: unitless
Description: <p>Cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/933694.rdf
Name: OXYGEN
Units: micromoles per kilogram (umol/kg)
Description: <p>Oxygen concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/933695.rdf
Name: SILCATE
Units: micromoles per kilogram (umol/kg)
Description: <p>Silicate concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/933696.rdf
Name: NITRATE
Units: micromoles per kilogram (umol/kg)
Description: <p>Nitrate Concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/933697.rdf
Name: NITRITE
Units: micromoles per kilogram (umol/kg)
Description: <p>Nitrite Concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/933698.rdf
Name: PHOSPHATE
Units: micromoles per kilogram (umol/kg)
Description: <p>Phosphate Concentration</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
75275
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/f4a4a6e9-42cc-4bc5-9878-2e39bf7b6313/content
download
https://doi.org/10.26008/1912/bco-dmo.933645.1
download
onLine
dataset
<p>Water samples were collected at discrete depths using Niskin bottle type rosette samplers and an SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA). This dataset's samples were collected from Niskin bottles into 160-milliliter (mL) glass serum vials, killed with saturated mercuric chloride, and crimp sealed with gray butyl stoppers. Prior to sealing, ~1 mL of sample was removed to allow room for sample expansion and to prevent the sample vessel from shattering upon warming.</p>
<p>In all cases, samples were extracted and analyzed using a custom automated purge and trap inlet system and normalized to an injection of calibrated pure N2O reference gas introduced prior to the elution of each sample peak (McIlvin &amp; Casciotti, 2010). Isotope ratios were referenced initially to the calibrated N2O reference tank to create a set of 'ratio of ratios' (³¹Rsample/³¹Rreference, ⁴⁵Rsample/⁴⁵Rreference, ⁴⁶Rsample/⁴⁶Rreference). Next, the data were size corrected in reference to a calibrated 20 volt-second (Vs) peak area for a mass-to-charge ratio of 44 (m/z 44). The size-corrected data were then corrected using a log-scaled normalization based on three isotopically distinct reference materials with known isotopocule compositions that were analyzed alongside the seawater samples (Kelly et al. 2023). Finally, 'scrambling coefficients' were applied to the isotopomer data to correct the measured 15Ra and 15Rb for the rearrangement of nitrogen atoms in N2O when the gas is ionized in the mass spectrometer ion source (Frame et al., 2014; Frame &amp; Casciotti, 2010; Kelly et al., 2021). The isotope ratios of N and O atoms in N2O, ¹⁵Rsample or ¹⁸Rsample, respectively, are expressed in delta notation (δ), where the δ15N and δ18O are defined relative to the isotope ratios of certified standards: δ15N or δ18O = (Rsample/Rstandard - 1) x1000. The Rstandard values used for δ15N and δ18O are the ratios of 15N/14N and 18O/16O in atmospheric N2 and Vienna Standard Mean Ocean Water (VSMOW), respectively.</p>
Specified by the Principal Investigator(s)
<p>CTD sensor data were processed using Seabird Electronics (SBE) Data Processing software using SBE recommended parameters, including the tau oxygen correction and oxygen hysteresis correction.</p>
<p>A quality control (QC) flag was also added for each measurement using the SeaDataNet QC guidelines available at <a href="https://www.seadatanet.org/Standards/Data-Quality-Control" target="_blank">https://www.seadatanet.org/Standards/Data-Quality-Control</a>:</p>
<p>1 = good value;<br />
2 = probably good value;<br />
3 = probably bad value;<br />
4 = bad value;<br />
9 = missing value.</p>
Specified by the Principal Investigator(s)
- Imported original file "gp16_bco_dmo_avg_stdv_240619.csv" into the BCO-DMO system.
- Flagged "NaN" as a missing data value (missing data are empty/blank in the final CSV file).
- Converted DATE field to YYYY-MM-DD format.
- Renamed fields to comply with BCO-DMO naming conventions.
- Saved the final file as "933645_v1_gp16_n2o_isotopes_and_concentrations.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
custom automated purge and trap inlet system
custom automated purge and trap inlet system
PI Supplied Instrument Name: custom automated purge and trap inlet system PI Supplied Instrument Description:This equipment removes dissolved gases from the water samples, traps the extracted compounds on a cold trap and then heats the trap and injects the trapped gases into the gas chromatograph. It is automated and controlled by a laptop computer. Instrument Name: Automated Purge and Trap System Instrument Short Name: Instrument Description: This equipment removes dissolved gases from the water samples, traps the extracted compounds on a cold trap and then heats the trap and injects the trapped gases into the gas chromatograph. It is automated and controlled by a laptop computer.
SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA)
SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA)
PI Supplied Instrument Name: SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA) Instrument Name: CTD Sea-Bird Instrument Short Name:CTD Sea-Bird Instrument Description: A Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics. This instrument designation is used when specific make and model are not known or when a more specific term is not available in the BCO-DMO vocabulary. Refer to the dataset-specific metadata for more information about the specific CTD used. More information from: http://www.seabird.com/ Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/130/
Thermo Fisher Delta V Plus Isotope Ratio Mass Spectrometer
Thermo Fisher Delta V Plus Isotope Ratio Mass Spectrometer
PI Supplied Instrument Name: Thermo Fisher Delta V Plus 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 bottle type rosette samplers
Niskin bottle type rosette samplers
PI Supplied Instrument Name: Niskin bottle type rosette samplers 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: TN303
TN303
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TN303
James W. Moffett
University of Southern California
http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/GT13_EPZT_ODFReport_All.pdf
Report describing TN303
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel