http://lod.bco-dmo.org/id/dataset/838914
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
2021-01-27
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Nitrate N and O isotopes from the GP12 ("PANDORA") cruise in the South-West Pacific and Solomon Sea from June to August 2012 carried out as part of the international GEOTRACES program
2021-01-27
publication
2021-01-27
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2021-02-02
publication
https://doi.org/10.26008/1912/bco-dmo.838914.1
Patrick Rafter
Princeton University
principalInvestigator
Catherine Jeandel
Laboratoire d’Etudes en Géophysique et Océanographie Spatiales
principalInvestigator
Daniel M. Sigman
Princeton 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: Rafter, P., Jeandel, C., Sigman, D. M. (2021) Nitrate N and O isotopes from the GP12 ("PANDORA") cruise in the South-West Pacific and Solomon Sea from June to August 2012 carried out as part of the international GEOTRACES program. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-01-27 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.838914.1 [access date]
Nitrate N and O isotopes from GP12 Dataset Description: Methods and Sampling: <p>Briefly, samples were acquired and kept frozen until analysis using the Denitrifier Method (Sigman et al. 2001; Casciotti et al. 2002) at Princeton University.</p>
<p>The following methods are further described in the <a href="https://datadocs.bco-dmo.org/docs/302/geotraces/GP12/data_docs/qs0dim__NITRATE_15_14_D_DELTA_BOTTLE-intercal-report.pdf" target="_blank">Intercalibration Report</a> (PDF)&nbsp;for this dataset (also provided under Supplemental Files).</p>
<p>Sampling and storage procedures followed the GEOTRACES cookbook: (1) seawater samples were collected from Niskin bottles into pre-rinsed square 60 mL high-density polyethylene (HDPE) bottles, (2) Each sample was filled to approximately ¾ the bottle height to prevent sample overflow during ice expansion, (3) Samples were stored immediately in upright position at -20°C. The one difference between the sampling for the PANDORA cruise and the GEOTRACES cookbook is that these samples were not filtered before freezing. As per the GEOTRACES cookbook, filtration is recommended, but prior tests showed no difference between filtered and non-filtered samples for nitrate isotope measurements (at least within 18 months of sampling).</p>
<p>Samples were analyzed by the Denitrifier Method (Casciotti et al., 2002; Sigman et al., 2001), with technical updates described by (Weigand et al., 2016). Specific protocols for these samples are described in (Marconi et al., 2015) and in detail along with extensive analysis of reference solution results in Weigand et al., 2016. All isotope analyses were performed on a MAT253 Thermo IRMS equipped with a custom-sample preparation system, described by Weigand et al. (2016). Nitrite was not removed from these samples, so they should be considered as possibly "Nitrate + Nitrite" measurements.&nbsp;</p>
<p>Raw data were calibrated to nitrate reference materials IAEA-NO3 and UGSS34, dissolved in low-nitrate seawater collected from the mixed layer at BATS. Samples were bracketed in nitrate concentration by the reference nitrate solutions. When nitrate reference solutions indicated a concentration trend in nitrate d18O, a correction was applied based on those results. These and other aspects of the data processing are described in detail by Weigand et al. (2016).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0960802 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0960802
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1060947 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1060947
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1736652 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1736652
completed
Patrick Rafter
Princeton University
858-405-0539
31503 Shrewsbury Dr.
Laguna Beach
CA
92651
USA
prafter@uci.edu
pointOfContact
Catherine Jeandel
Laboratoire d’Etudes en Géophysique et Océanographie Spatiales
catherine.jeandel@legos.obs-mip.fr
pointOfContact
Daniel M. Sigman
Princeton University
609-258-2194
Department of Geosciences M52 Guyot Hall
Princeton
NJ
08544
USA
sigman@princeton.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Station_ID
Start_Date_UTC
Start_Time_UTC
End_Date_UTC
End_Time_UTC
Start_Latitude
Start_Longitude
End_Latitude
End_Longitude
Event_ID
Sample_ID
Sample_Depth
NITRATE_15_14_D_DELTA_BOTTLE_qs0dim
SD1_NITRATE_15_14_D_DELTA_BOTTLE_qs0dim
Flag_NITRATE_15_14_D_DELTA_BOTTLE_qs0dim
NITRATE_18_16_D_DELTA_BOTTLE_zhttuq
SD1_NITRATE_18_16_D_DELTA_BOTTLE_zhttuq
Flag_NITRATE_18_16_D_DELTA_BOTTLE_zhttuq
MAT253 Thermo IRMS
Niskin bottles
theme
None, User defined
station
date
time of day
latitude
longitude
event
sample identification
depth
ratio
quality flag
featureType
BCO-DMO Standard Parameters
Isotope-ratio Mass Spectrometer
Niskin bottle
instrument
BCO-DMO Standard Instruments
GP12
service
Deployment Activity
South Pacific, Solomon Sea
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
Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study
https://osprey.bco-dmo.org/project/743583
Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study
<p><em>NSF Award Abstract:</em><br />
Nitrogen (N) and phosphorus are the two nutrients required in large quantity by phytoplankton in the ocean, and together they limit productivity throughout most of the tropical, subtropical, and temperate ocean. Both the cycling of N and its input/output budget have been argued to control the fertility of the ocean and the ocean's role in setting atmospheric CO2. The CaCO3 tests of foraminifera can represent a substantial fraction of marine sediments and have been used extensively in paleoceanography; they are an obvious target for isotopic analysis of microfossil-bound organic matter.</p>
<p>In recent years, researchers at Princeton have developed a protocol for the isotopic analysis of foraminiferal shell-bound N. The current protocol is at least 100 times more sensitive than typical on-line combustion, allowing for rapid progress with a N isotope archive that was previously not feasible to measure. Measurements on surface sediments and a downcore record from the Caribbean show the promise of foraminifera-bound del15N (fb-del15N) to provide both a robust N isotope archive for paleoceanography, and one with a unique potential of richness, given the existence of multiple foraminiferal species with different depth habitats and behaviors. Moreover, the finding from the Caribbean Sea record -- reduced N fixation in ice age Atlantic -- has changed the scientific conversation about the nature of the input/output budget of oceanic fixed N and its potential to change ocean fertility and atmospheric CO2. However, the controls on fb-del15N have not yet been adequately studied.</p>
<p>In this project, as a first major step in developing a foundation for the paleoceanographic application of fb-del15N, the same Princeton University team will study its genesis in the water column, transport to the seafloor, and early diagenesis. They will undertake this study in the Sargasso Sea south of Bermuda. This is one of the best studied regions of the ocean, in general and with respect to foraminifera, and a region that has been has been a focus of the N isotope research of the PI for the last decade and others previously. Moreover, its significant seasonality -- in physical oceanography, biogeochemistry, and foraminiferal species abundance -- will facilitate the effort to understand the controls on fb-del15N at a mechanistic level. The research team will participate in six Bermuda Atlantic Time-series Study (BATS) cruises over two years, collecting foraminifera and other N forms likely to provide insight into the controls on fb-del15N. From the nearby Oceanic Flux Program (OFP) moored sediment traps and from shallow sediments collected in the region, they will pick foraminifera shells and again make relevant ancillary measurements. This work will establish the relationship of foraminiferal biomass to shell-bound del15N for different species, and comparison of the foraminiferal isotope data with the upper ocean N pools will yield empirical isotopic relationships and work toward a mechanistic insight of fb-del15N (e.g., the importance of different N pools to the diets of different foraminifera; the role of algal symbionts). The sediment trap and surface sediment data will support the plankton tow data by integrating over longer time scales and will also address questions regarding late stage (e.g., gametogenic) calcification and the early diagenesis of fb-del15N and fb-N content.</p>
<p>Broader Impacts: This study will yield an improved understanding of the nutrient dynamics of foraminifera, a class of organisms whose shells are a central tool in micropaleontology and paleoclimatology. The project will also build on the principal investigator's involvement in the Bermuda Institute of Ocean Sciences as an asset for integrating ocean-related education and research at both the undergraduate and graduate levels.</p>
N Isotopes Foraminifera
largerWorkCitation
project
Collaborative Research: US GEOTRACES PMT: Investigating geochemical tracers of the Pacific nitrogen cycle and budget
https://osprey.bco-dmo.org/project/838924
Collaborative Research: US GEOTRACES PMT: Investigating geochemical tracers of the Pacific nitrogen cycle and budget
<p><em>NSF Award Abstract:</em><br />
Nitrate is an important nutrient that marine plants and algae need for growth. It is abundant in deep ocean waters, but scarce in most sunlit surface waters. The purpose of this project is to better understand what controls the availability of nitrate in the deep ocean and its delivery to surface waters. Researchers from Stanford University, Princeton University, and Brown University will analyze the stable isotopes of seawater nitrate collected between Alaska and Tahiti in the Pacific Ocean. The data will provide information about the supply of nitrate to a large section of the Pacific Ocean and allow informed decisions on past and future changes in marine photosynthesis. This collaborative project will be carried under the GEOTRACES program, an international effort to understand the distribution of elements in the global ocean. This study will include undergraduate, graduate, and postdoctoral researchers at all three academic institutions. The investigators will develop a 1-day workshop for the Teachers as Scholars program, for middle and high school teachers at Princeton University. The workshop will focus on accessing and visualizing ocean data sets and other content available on the internet for project-based learning in the classroom. Investigators will also participate in teacher workshops offered each summer at Stanford University. Data from this project will be made available to the public through the Biological and Chemical Oceanography-Data Management Office (bco-dmo.org). The data will also be compiled in GEOTRACES data products that will be freely available.</p>
<p>The isotopic composition of nitrate in the ocean interior records biogeochemical and physical processes on the time scales of years, decades, centuries, and millennia, with the shallow subsurface and deep ocean recording shorter and longer time scales, respectively. These are meaningful time scales in the efforts to (1) understand the feedbacks that structure the biogeochemistry of N in the ocean, ocean productivity, and the global carbon cycle, (2) reconstruct past changes in ocean biogeochemistry and carbon cycling, and (3) perhaps predict future changes. This proposal seeks to analyze the nitrate isotopes during the upcoming US GEOTRACES Pacific Meridional Transect (GP15) between Alaska and Tahiti. Nitrate isotopes provide critical constraints on the ocean N cycle and budget, especially in the Pacific Ocean where a variety of processes affect the distribution of nitrate and its supply to surface waters. This largely meridional section of nitrate isotope data will be broadly useful as part of the growing nitrate isotope dataset for the global ocean and for comparison to the many complementary geochemical data sets that will be generated as part of this GEOTRACES effort. In addition, nitrate isotopes in aerosols will be measured to support interpretations of nitrate isotopes in surface waters along the section. The proposed measurements will contribute to the investigation of three overarching questions: 1) What are the similarities and differences in N biogeochemistry among the different nutrient-rich regions in the Pacific basin: the Southern Ocean, equatorial Pacific, and subarctic North Pacific, and how do they affect nitrate supply to low-latitude surface waters? 2) What sources of nitrogen fuel export production in surface waters across the Pacific? 3) What are the roles in surface and subsurface processes in the distribution of nitrate isotopes in the ocean interior?</p>
PMT Nitrate
largerWorkCitation
project
Collaborative Research: GEOTRACES Atlantic Section Nitrate Isotope Measurements (GP12)
https://osprey.bco-dmo.org/project/839345
Collaborative Research: GEOTRACES Atlantic Section Nitrate Isotope Measurements (GP12)
<p><em>NSF Award Abstract:</em><br />
Nitrogen is one of the two major nutrients required universally by plankton in the ocean, and its availability can affect the ocean's ecology, productivity, and carbon cycle. While the cycling of fixed N in the ocean is in one sense emblematic of other nutrient cycles, it is also unique in that its largest input (N fixation) and output (denitrification) are biologically mediated, which renders the ocean N budget susceptible to complex biological feedbacks. It thus provides a platform for asking one of the core questions of global biogeochemical cycles: How is it that the actions of individual organisms and groups conspire with physicochemical conditions to produce a global Earth surface environment that has been continuously habitable for billions of years?</p>
<p>The dominant terms in the oceanic fixed N input/output budget are poorly characterized, and we focus our attention here on N fixation. Developing robust estimates of the global rate and distribution of N fixation from "direct" shipboard measurements of N fixing activity is complicated by the inherent spatial and temporal variability of this biologically mediated flux. Thus, geochemical approaches for estimating N fixation inputs have come to the forefront. Currently, nitrate stable isotope measurements, which could provide an integrative estimate of N fixation on a regional or basin scale, are sparse in the Atlantic, being focused primarily in the Sargasso Sea. The GEOTRACES program provides a platform to put these data into a broader context through the illumination of basin-scale patterns.</p>
<p>In this project researchers from Princeton University, Brown University, and the Woods Hole Oceanographic Institution will measure the d15N of nitrate in seawater and atmospheric samples collected as part of the GEOTRACES North Atlantic Section. Nitrate d15N is a GEOTRACES "core parameter" that will complement other measurements and will by itself provide important constraints on the oceanographic processes, including N fixation, lateral nitrate transport, low latitude N cycling, the effect of the North African upwelling regions on nutrient fluxes across the basin, and the exchange of fixed N with the Mediterranean. In addition to yielding such specific process-related insights, this work will provide one of the first cross-basin views of nitrate isotopes in the interior and will thus help to simply characterize the isotope signals of different interior water masses, including the Mode Waters, Antarctic Intermediate Water, Mediterranean Intermediate Water, Lower and Upper North Atlantic Deep Water, and Antarctic Bottom Water. Finally, the isotopic characterization of atmospheric nitrate deposition will inform our understanding of the N isotope budget and isotopic gradients of the North Atlantic. Combined, these measurements will yield insight into modern biogeochemical processes and will also provide first order background information for both modern physical oceanographic and paleoceanographic applications. As an example of the latter, studies of Atlantic sediments seek to reconstruct past changes in the rate of N fixation, based on the modern finding that N fixation appears to lower the d15N of thermocline nitrate in the Sargasso Sea. Progress in this paleoceanographic work relies on a more complete picture of nitrate d15N in the modern Atlantic.</p>
<p>Broader impacts: The broader impacts of the proposed study include the mentoring of a postdoctoral investigator and the inclusion of undergraduates in state-of-the-art research. The project will also provide a high-quality nitrate isotope data set for the North Atlantic for use by the broader community.</p>
GP12 Atlantic Nitrate
largerWorkCitation
project
eng; USA
oceans
South Pacific, Solomon Sea
149.999
163
-14
-5.503
2012-07-02
2012-07-26
Sargasso Sea
0
BCO-DMO catalogue of parameters from Nitrate N and O isotopes from the GP12 ("PANDORA") cruise in the South-West Pacific and Solomon Sea from June to August 2012 carried out as part of the international GEOTRACES program
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/838931.rdf
Name: Station_ID
Units: unitless
Description: <p>Station number</p>
http://lod.bco-dmo.org/id/dataset-parameter/838932.rdf
Name: Start_Date_UTC
Units: unitless
Description: <p>Date the event started (UTC); format: YYYY-MM-DD</p>
http://lod.bco-dmo.org/id/dataset-parameter/838933.rdf
Name: Start_Time_UTC
Units: unitless
Description: <p>Time the event started (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838934.rdf
Name: End_Date_UTC
Units: unitless
Description: <p>Date the event ended (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838935.rdf
Name: End_Time_UTC
Units: unitless
Description: <p>Time the event ended (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838936.rdf
Name: Start_Latitude
Units: degrees North
Description: <p>Latitude the event started</p>
http://lod.bco-dmo.org/id/dataset-parameter/838937.rdf
Name: Start_Longitude
Units: degrees East
Description: <p>Longitude the event started</p>
http://lod.bco-dmo.org/id/dataset-parameter/838938.rdf
Name: End_Latitude
Units: degrees North
Description: <p>Latitude the event ended (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838939.rdf
Name: End_Longitude
Units: degrees East
Description: <p>Longitude the event ended (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838940.rdf
Name: Event_ID
Units: unitless
Description: <p>Event number (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838941.rdf
Name: Sample_ID
Units: unitless
Description: <p>GEOTRACES sample number (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838942.rdf
Name: Sample_Depth
Units: meters (m)
Description: <p>Sample depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/838943.rdf
Name: NITRATE_15_14_D_DELTA_BOTTLE_qs0dim
Units: per mil
Description: <p>Atom ratio of dissolved N isotopes in NITRATE expressed in conventional DELTA notation referenced to Air N2, samples may or may not have been filtered</p>
http://lod.bco-dmo.org/id/dataset-parameter/838944.rdf
Name: SD1_NITRATE_15_14_D_DELTA_BOTTLE_qs0dim
Units: per mil
Description: <p>One standard deviation of NITRATE_15_14_D_DELTA_BOTTLE_qs0dim</p>
http://lod.bco-dmo.org/id/dataset-parameter/838945.rdf
Name: Flag_NITRATE_15_14_D_DELTA_BOTTLE_qs0dim
Units: unitless
Description: <p>Quality flag for NITRATE_15_14_D_DELTA_BOTTLE_qs0dim (no data)</p>
http://lod.bco-dmo.org/id/dataset-parameter/838946.rdf
Name: NITRATE_18_16_D_DELTA_BOTTLE_zhttuq
Units: per mil
Description: <p>Atom ratio of dissolved O isotopes in NITRATE expressed in conventional DELTA notation referenced to {VSMOW}, samples may or may not have been filtered</p>
http://lod.bco-dmo.org/id/dataset-parameter/838947.rdf
Name: SD1_NITRATE_18_16_D_DELTA_BOTTLE_zhttuq
Units: per mil
Description: <p>One standard deviation of NITRATE_18_16_D_DELTA_BOTTLE_zhttuq</p>
http://lod.bco-dmo.org/id/dataset-parameter/838948.rdf
Name: Flag_NITRATE_18_16_D_DELTA_BOTTLE_zhttuq
Units: unitless
Description: <p>Quality flag for NITRATE_18_16_D_DELTA_BOTTLE_zhttuq (no data)</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
3281
https://darchive.mblwhoilibrary.org/bitstream/1912/26640/1/dataset-838914_gp12-nitrate-n-and-o-isotopes__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.838914.1
download
onLine
dataset
<p>Briefly, samples were acquired and kept frozen until analysis using the Denitrifier Method (Sigman et al. 2001; Casciotti et al. 2002) at Princeton University.</p>
<p>The following methods are further described in the <a href="https://datadocs.bco-dmo.org/docs/302/geotraces/GP12/data_docs/qs0dim__NITRATE_15_14_D_DELTA_BOTTLE-intercal-report.pdf" target="_blank">Intercalibration Report</a> (PDF)&nbsp;for this dataset (also provided under Supplemental Files).</p>
<p>Sampling and storage procedures followed the GEOTRACES cookbook: (1) seawater samples were collected from Niskin bottles into pre-rinsed square 60 mL high-density polyethylene (HDPE) bottles, (2) Each sample was filled to approximately ¾ the bottle height to prevent sample overflow during ice expansion, (3) Samples were stored immediately in upright position at -20°C. The one difference between the sampling for the PANDORA cruise and the GEOTRACES cookbook is that these samples were not filtered before freezing. As per the GEOTRACES cookbook, filtration is recommended, but prior tests showed no difference between filtered and non-filtered samples for nitrate isotope measurements (at least within 18 months of sampling).</p>
<p>Samples were analyzed by the Denitrifier Method (Casciotti et al., 2002; Sigman et al., 2001), with technical updates described by (Weigand et al., 2016). Specific protocols for these samples are described in (Marconi et al., 2015) and in detail along with extensive analysis of reference solution results in Weigand et al., 2016. All isotope analyses were performed on a MAT253 Thermo IRMS equipped with a custom-sample preparation system, described by Weigand et al. (2016). Nitrite was not removed from these samples, so they should be considered as possibly "Nitrate + Nitrite" measurements.&nbsp;</p>
<p>Raw data were calibrated to nitrate reference materials IAEA-NO3 and UGSS34, dissolved in low-nitrate seawater collected from the mixed layer at BATS. Samples were bracketed in nitrate concentration by the reference nitrate solutions. When nitrate reference solutions indicated a concentration trend in nitrate d18O, a correction was applied based on those results. These and other aspects of the data processing are described in detail by Weigand et al. (2016).</p>
Specified by the Principal Investigator(s)
<p>For blank values, detection limits, and internal and external consistency&nbsp;information, refer to the <a href="https://datadocs.bco-dmo.org/docs/302/geotraces/GP12/data_docs/qs0dim__NITRATE_15_14_D_DELTA_BOTTLE-intercal-report.pdf" target="_blank">Intercalibration Report</a> (PDF).</p>
<p>Reported standard deviation is either observed value for replicate analysis or average of this standard deviation (0.04 per mil for d15N and 0.09 per mil for d18O). One sample at very low nitrate concentration (&lt;0.5 uM) has a much higher standard deviation for both d15N and d18O.</p>
<p>BCO-DMO Processing:<br />
- renamed parameters;<br />
- converted Start_Date_UTC field to format YYYY-MM-DD.</p>
Specified by the Principal Investigator(s)
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
MAT253 Thermo IRMS
MAT253 Thermo IRMS
PI Supplied Instrument Name: MAT253 Thermo IRMS PI Supplied Instrument Description:Isotope analyses were performed on a MAT253 Thermo IRMS 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
Niskin bottles
PI Supplied Instrument Name: Niskin bottles PI Supplied Instrument Description:Seawater samples were collected from Niskin bottles 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: GP12
GP12
R/V L'Atalante
Community Standard Description
International Council for the Exploration of the Sea
R/V L'Atalante
vessel
R/V L'Atalante
Community Standard Description
International Council for the Exploration of the Sea
R/V L'Atalante
vessel