http://lod.bco-dmo.org/id/dataset/733109
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
2018-04-09
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Nitrate N and O isotope ratios from CTD niskin depth profiles collected along section HLY1502-GN01 in the Western Arctic Ocean from August to October 2015
2020-07-09
publication
2020-07-09
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2020-07-27
publication
https://doi.org/10.26008/1912/bco-dmo.733109.2
Julie Granger
University of Connecticut
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: Granger, J. (2020) Nitrate N and O isotope ratios from CTD niskin depth profiles collected along section HLY1502-GN01 in the Western Arctic Ocean from August to October 2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2020-07-09 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.733109.2 [access date]
Isotope ratios of N and O in nitrate from US GEOTRACES-Arctic cruise HLY1502 in 2015. Dataset Description: <p>Isotope ratios of N and O in nitrate&nbsp;from US GEOTRACES-Arctic cruise HLY1502 in 2015.</p> Methods and Sampling: <p>Seawater samples for nitrate isotope analyses were filtered through a 0.2-um pore-size polyethersulfone membrane into pre-rinsed 60-ml high density polyethylene bottles and were stored frozen until analysis.</p>
<p>The naturally occurring isotope ratios of nitrogen (15N/14N) and oxygen (18O/16O) in nitrate (NO3-) were analyzed by the denitrifier method (Casciotti et al., 2002; Sigman et al., 2001). Briefly, 20 nmol of NO3- were quantitatively reduced to nitrous oxide (N2O) gas by denitrifying bacteria that lack an active terminal N2O reductase (P. chlororaphis f. sp. aureofaciens; ATCC #13985). The product N2O was analyzed by continuous flow isotope ratio mass spectrometry on a Thermo Delta V Advantage isotope ratio mass spectrometer interfaced with a purpose-built, gas chromatography-based device for N2O extraction, concentration, and purification (Casciotti et al., 2002; McIlvin &amp; Casciotti, 2011). Nitrite (NO2-), which interferes with the NO3- isotope analyses, was removed from samples with sulfamic acid (Granger &amp; Sigman, 2009) prior to analysis in the few samples where it was detected. Individual analyses were referenced to injections from a laboratory standard N2O tank and calibrated using the NO3- reference materials IAEA-N3 (4.7‰vs. N2 and 25.6‰vs. VSMOW; Böhlke et al., 2003; Gonfiantiniet al., 1995) and U.S. Geological Survey-34 (+1.8‰vs. N2; -27.9‰vs. VSMOW; Böhlke et al., 2003), with monitoring of reproducibility by analysis of an internal seawater NO3- standard from the deep North Atlantic. NO3- standards in individual runs were diluted in nutrient-free seawater to concentrations equivalent to those of samples to account for potential matrix effects on δ18ONO3 measurements (Weigand et al., 2016). In order to ensure measurement accuracy, samples were analyzed in duplicate within runs, for a minimum of three discrete runs, yielding average standard deviations of 0.2‰ for N and 0.3‰ for O, although with a lower precision averaging 0.4‰ for δ18ONO3 at lower NO3- concentrations (&lt;10 μM).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1435002 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1435002
completed
Julie Granger
University of Connecticut
860-405-9094
Department of Marine Sciences 1080 Shenecossett Road
Groton
CT
06340
USA
julie.granger@uconn.edu
pointOfContact
asNeeded
Dataset Version: 2
Unknown
Station_ID
CASTNO
Start_Date_UTC
Start_Time_UTC
Start_ISO_DateTime_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_qwo9pn
SD1_NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn
Flag_NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn
NITRATE_18_16_D_DELTA_BOTTLE_qmffoc
SD1_NITRATE_18_16_D_DELTA_BOTTLE_qmffoc
Flag_NITRATE_18_16_D_DELTA_BOTTLE_qmffoc
GC-IRMS
Niskin bottle
theme
None, User defined
station
cast
date
time of day
ISO_DateTime_UTC
latitude
longitude
event
sample identification
depth
No BCO-DMO term
quality flag
featureType
BCO-DMO Standard Parameters
Isotope-ratio Mass Spectrometer
Niskin bottle
instrument
BCO-DMO Standard Instruments
HLY1502
service
Deployment Activity
Western Arctic 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
U.S. Arctic GEOTRACES Study (GN01)
https://www.geotraces.org/
U.S. Arctic GEOTRACES Study (GN01)
<p><em>Description from NSF award abstract:</em><br />
In pursuit of its goal "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", in 2015 the International GEOTRACES Program will embark on several years of research in the Arctic Ocean. In a region where climate warming and general environmental change are occurring at amazing speed, research such as this is important for understanding the current state of Arctic Ocean geochemistry and for developing predictive capability as the regional ecosystem continues to warm and influence global oceanic and climatic conditions. The three investigators funded on this award, will manage a large team of U.S.scientists who will compete through the regular NSF proposal process to contribute their own unique expertise in marine trace metal, isotopic, and carbon cycle geochemistry to the U.S. effort. The three managers will be responsible for arranging and overseeing at-sea technical services such as hydrographic measurements, nutrient analyses, and around-the-clock management of on-deck sampling activites upon which all participants depend, and for organizing all pre- and post-cruise technical support and scientific meetings. The management team will also lead educational outreach activities for the general public in Nome and Barrow, Alaska, to explain the significance of the study to these communities and to learn from residents' insights on observed changes in the marine system. The project itself will provide for the support and training of a number of pre-doctoral students and post-doctoral researchers. Inasmuch as the Arctic Ocean is an epicenter of global climate change, findings of this study are expected to advance present capability to forecast changes in regional and globlal ecosystem and climate system functioning.</p>
<p>As the United States' contribution to the International GEOTRACES Arctic Ocean initiative, this project will be part of an ongoing multi-national effort to further scientific knowledge about trace elements and isotopes in the world ocean. This U.S. expedition will focus on the western Arctic Ocean in the boreal summer of 2015. The scientific team will consist of the management team funded through this award plus a team of scientists from U.S. academic institutions who will have successfully competed for and received NSF funds for specific science projects in time to participate in the final stages of cruise planning. The cruise track segments will include the Bering Strait, Chukchi shelf, and the deep Canada Basin. Several stations will be designated as so-called super stations for intense study of atmospheric aerosols, sea ice, and sediment chemistry as well as water-column processes. In total, the set of coordinated international expeditions will involve the deployment of ice-capable research ships from 6 nations (US, Canada, Germany, Sweden, UK, and Russia) across different parts of the Arctic Ocean, and application of state-of-the-art methods to unravel the complex dynamics of trace metals and isotopes that are important as oceanographic and biogeochemical tracers in the sea.</p>
U.S. GEOTRACES Arctic
largerWorkCitation
project
Collaborative Research: GEOTRACES Arctic Ocean section-Constraining Nitrogen Cycling in the western Arctic Ocean.
https://osprey.bco-dmo.org/project/728170
Collaborative Research: GEOTRACES Arctic Ocean section-Constraining Nitrogen Cycling in the western Arctic Ocean.
<p>In this project, a group of investigators from the University of Connecticut, the University of Massachusetts-Dartmouth, and Brown University will participate in the 2015 U.S. GEOTRACES Arctic expedition to determine the biogeochemistry of nitrogen in the region. In common with other multinational initiatives in the International GEOTRACES Program, the goals of the U.S. Arctic expedition are 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. Some trace elements are essential to life, others are known biological toxins, and still others are important because they can be used as tracers of a variety of physical, chemical, and biological processes in the sea. Nitrogen is one of the two major nutrients required universally by plankton in the ocean, and this study in the Arctic Ocean will increase our understanding of the ocean?s ecology, productivity, and carbon cycle. This study will also provide training for graduate and undergraduate students, and results will be shared through public outreach events.</p>
<p>The state of knowledge of Arctic nitrogen (N) biogeochemistry remains cursory as compared to that in other ocean basins despite the fact that understanding Arctic Ocean nitrogen cycling is central to understanding its global biogeochemistry. For one, benthic nitrogen loss on Arctic continental shelves may represent a globally significant sink of oceanic fixed nitrogen. Second, benthic nitrogen loss on the Arctic continental shelf and slope reduces the ratio of nitrate to phosphate substantially below the mean requirements of phytoplankton nitrogen, consequently limiting primary production at the ice-free surface of the western Arctic Ocean. In light of the rapid changes in Arctic climatology, the characterization of its biogeochemistry and establishment of a baseline from which to monitor future changes is critical. Researchers will use the stable N isotope (15N/14N) ratio in nitrate, nitrite, ammonium, and nitrogen gas determined for a suite of dissolved, particulate, atmospheric, snow, and sea-ice samples to better constrain the spatial and temporal variability of biological nitrogen transformations in the Arctic. Results from this study will provide a first order understanding of the contribution of water masses to the regional nitrogen budget, identify regional nitrogen sources and sinks, and diagnose important biological nitrogen transformations that occur on the Chukchi shelf, and in the central basins.</p>
US GEOTRACES Arctic Nitrogen Flux
largerWorkCitation
project
eng; USA
oceans
Western Arctic Ocean
-179.8086
179.1997
60.252
89.9876
2015-08-12
2015-10-05
From projects that focused on the following 2 locations: 1. Arctic Ocean; Sailing from Dutch Harbor to Dutch Harbor (GN01) 2. Chukchi shelf and western Arctic Ocean basins
0
BCO-DMO catalogue of parameters from Nitrate N and O isotope ratios from CTD niskin depth profiles collected along section HLY1502-GN01 in the Western Arctic Ocean from August to October 2015
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/818653.rdf
Name: Station_ID
Units: unitless
Description: <p>Station number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818654.rdf
Name: CASTNO
Units: unitless
Description: <p>Cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818655.rdf
Name: Start_Date_UTC
Units: unitless
Description: <p>Sampling start date (UTC); format: YYYYMMDD</p>
http://lod.bco-dmo.org/id/dataset-parameter/818656.rdf
Name: Start_Time_UTC
Units: unitless
Description: <p>Sampling start time (UTC); format: hh:mm</p>
http://lod.bco-dmo.org/id/dataset-parameter/818657.rdf
Name: Start_ISO_DateTime_UTC
Units: unitless
Description: <p>Sampling start date/time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmz</p>
http://lod.bco-dmo.org/id/dataset-parameter/818658.rdf
Name: End_Date_UTC
Units: unitless
Description: <p>Sampling end date (UTC); format: YYYYMMDD</p>
http://lod.bco-dmo.org/id/dataset-parameter/818659.rdf
Name: End_Time_UTC
Units: unitless
Description: <p>Sampling end time (UTC); format: hh:mm</p>
http://lod.bco-dmo.org/id/dataset-parameter/818660.rdf
Name: Start_Latitude
Units: decimal degrees North
Description: <p>Sampling start latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818661.rdf
Name: Start_Longitude
Units: decimal degrees East
Description: <p>Sampling start longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818662.rdf
Name: End_Latitude
Units: decimal degrees North
Description: <p>Sampling end latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818663.rdf
Name: End_Longitude
Units: decimal degrees East
Description: <p>Sampling end longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818664.rdf
Name: Event_ID
Units: unitless
Description: <p>GEOTRACES event number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818665.rdf
Name: Sample_ID
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818666.rdf
Name: Sample_Depth
Units: meters (m)
Description: <p>Sample depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/818667.rdf
Name: NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn
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/818668.rdf
Name: SD1_NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn
Units: per mil
Description: <p>One standard deviation of NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn</p>
http://lod.bco-dmo.org/id/dataset-parameter/818669.rdf
Name: Flag_NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn
Units: unitless
Description: <p>Quality flag for NITRATE_15_14_D_DELTA_BOTTLE_qwo9pn</p>
http://lod.bco-dmo.org/id/dataset-parameter/818670.rdf
Name: NITRATE_18_16_D_DELTA_BOTTLE_qmffoc
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/818671.rdf
Name: SD1_NITRATE_18_16_D_DELTA_BOTTLE_qmffoc
Units: per mil
Description: <p>One standard deviation of NITRATE_18_16_D_DELTA_BOTTLE_qmffoc</p>
http://lod.bco-dmo.org/id/dataset-parameter/818672.rdf
Name: Flag_NITRATE_18_16_D_DELTA_BOTTLE_qmffoc
Units: unitless
Description: <p>Quality flag for NITRATE_18_16_D_DELTA_BOTTLE_qmffoc</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
29692
https://darchive.mblwhoilibrary.org/bitstream/1912/26005/1/dataset-733109_gn01-nitrate-n-and-o-isotope-ratios__v2.tsv
download
https://doi.org/10.26008/1912/bco-dmo.733109.2
download
onLine
dataset
<p>Seawater samples for nitrate isotope analyses were filtered through a 0.2-um pore-size polyethersulfone membrane into pre-rinsed 60-ml high density polyethylene bottles and were stored frozen until analysis.</p>
<p>The naturally occurring isotope ratios of nitrogen (15N/14N) and oxygen (18O/16O) in nitrate (NO3-) were analyzed by the denitrifier method (Casciotti et al., 2002; Sigman et al., 2001). Briefly, 20 nmol of NO3- were quantitatively reduced to nitrous oxide (N2O) gas by denitrifying bacteria that lack an active terminal N2O reductase (P. chlororaphis f. sp. aureofaciens; ATCC #13985). The product N2O was analyzed by continuous flow isotope ratio mass spectrometry on a Thermo Delta V Advantage isotope ratio mass spectrometer interfaced with a purpose-built, gas chromatography-based device for N2O extraction, concentration, and purification (Casciotti et al., 2002; McIlvin &amp; Casciotti, 2011). Nitrite (NO2-), which interferes with the NO3- isotope analyses, was removed from samples with sulfamic acid (Granger &amp; Sigman, 2009) prior to analysis in the few samples where it was detected. Individual analyses were referenced to injections from a laboratory standard N2O tank and calibrated using the NO3- reference materials IAEA-N3 (4.7‰vs. N2 and 25.6‰vs. VSMOW; Böhlke et al., 2003; Gonfiantiniet al., 1995) and U.S. Geological Survey-34 (+1.8‰vs. N2; -27.9‰vs. VSMOW; Böhlke et al., 2003), with monitoring of reproducibility by analysis of an internal seawater NO3- standard from the deep North Atlantic. NO3- standards in individual runs were diluted in nutrient-free seawater to concentrations equivalent to those of samples to account for potential matrix effects on δ18ONO3 measurements (Weigand et al., 2016). In order to ensure measurement accuracy, samples were analyzed in duplicate within runs, for a minimum of three discrete runs, yielding average standard deviations of 0.2‰ for N and 0.3‰ for O, although with a lower precision averaging 0.4‰ for δ18ONO3 at lower NO3- concentrations (&lt;10 μM).</p>
Specified by the Principal Investigator(s)
<p><strong>BCO-DMO Processing:</strong><br />
- re-formatted time so values are all 4 digits;<br />
- added date/time columns in ISO8601 format;<br />
- renamed fields.</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
GC-IRMS
GC-IRMS
PI Supplied Instrument Name: GC-IRMS PI Supplied Instrument Description:The product N2O was analyzed by continuous flow isotope ratio mass spectrometry on a Thermo Delta V Advantage isotope ratio mass spectrometer interfaced with a purpose-built, gas chromatography-based device for N2O extraction, concentration, and purification. 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
Niskin bottle
PI Supplied Instrument Name: Niskin bottle PI Supplied Instrument Description:Water samples from Niskin bottles were filtered through 0.2 µm pore-size PES membrane filter and stored frozen in acid-washed 60 mL HDPE 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: HLY1502
HLY1502
USCGC Healy
Community Standard Description
International Council for the Exploration of the Sea
USCGC Healy
vessel
HLY1502
David C. Kadko
Florida International University
https://datadocs.bco-dmo.org/docs/302/geotraces/GEOTRACES_ARCTIC/data_docs/cruise_reports/healy1502.pdf
Report describing HLY1502
USCGC Healy
Community Standard Description
International Council for the Exploration of the Sea
USCGC Healy
vessel