http://lod.bco-dmo.org/id/dataset/733237
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
2018-04-11
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the southwest Pacific Ocean between New Caledonia and Tahiti from February to March 2015
2018-04-11
publication
2018-04-11
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2018-04-13
publication
https://doi.org/10.1575/1912/bco-dmo.733303
Angela N. Knapp
Florida State University
principalInvestigator
Sophie Bonnet
Mediterranean Institute of Oceanography
principalInvestigator
Thierry Moutin
Mediterranean Institute of Oceanography
principalInvestigator
Oliver Grosso
Mediterranean Institute of Oceanography
principalInvestigator
Nathalie Leblond
Laboratoire d'Oceanographie de Villefranche
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: Knapp, A., McCabe, K., Grosso, O., Leblond, N., Moutin, T., Bonnet, S. (2018) Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the southwest Pacific Ocean between New Caledonia and Tahiti from February to March 2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2018-04-11) Version Date 2018-04-11 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.733303 [access date]
Water column nitrate+nitrite d15N measurements Dataset Description: <p>This data set includes water column nitrate+nitrite d15N measurements. These measurements were used together with measurements of the d15N of particulate nitrogen collected in floating sediment traps that were deployed for several days to calculate the relative contribution of subsurface nitrate and nitrogen from N2 fixation for supporting export production (“d15N budgets”). The results suggest that N2 fixation supported a majority of export at Long Duration (LD) stations A and B, and a minor fraction of export at LD C. The results at LD stations A and B are unique compared to other d15N budgets from the oligotrophic regions, whereas the results from LD C are similar to prior reports from the eastern tropical South Pacific as well as the North Pacific near Hawaii. Additionally, these data are compared with other metrics of N2 fixation made on the same cruise.&nbsp;</p> Methods and Sampling: <p>NO3-+NO2- d15N analysis was by the “denitrifier method” and followed the methods described by Sigman et al., 2001, Casciotti et al., 2002, McIlvin and Casciotti, 2011, and Weigand et al., 2016. Briefly, NO3-+NO2- was quantitatively reduced to N2O by Pseudomonas aureofaciens and Pseudomonas chlororaphis, which was then cryogenically focused and analyzed on an isotope ratio mass spectrometer. A volume of sample was added to each bacterial vial to achieve a final quantity of 10 or 20 nmols N2O, which was then purged from the vial using a helium carrier gas. The d15N of N2O in samples was calibrated with the international isotopic reference materials described in the Processing Description.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1537314 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1537314
completed
Angela N. Knapp
Florida State University
(979) 862-5235
797 Lamar St. Dept of Oceanography, Eller O&M Room 1204
College Station
TX
77843
USA
aknapp@tamu.edu
pointOfContact
Sophie Bonnet
Mediterranean Institute of Oceanography
+687 26.07.46
Mediterranean Institute of Oceanography (MIO) Luminy Campus
13009 Marseille
CEDEX 09
France
sophie.bonnet@mio.osupytheas.fr
pointOfContact
Thierry Moutin
Mediterranean Institute of Oceanography
00 33 (0) 4 91 82 95 60
Marseille
France
thierry.moutin@mio.osupytheas.fr
pointOfContact
Oliver Grosso
Mediterranean Institute of Oceanography
00486090535
Marseille
France
olivier.grosso@mio.osupytheas.fr
pointOfContact
Nathalie Leblond
Laboratoire d'Oceanographie de Villefranche
330493763991
181 Chemin du Lazaret
UMR 7093
Villefranche-sur-mer
France
pointOfContact
asNeeded
Dataset Version: 2018-04-11
Unknown
Cast
Depth
Sigma_theta
NO3_NO2
NO3_NO2_d15N
NO3_NO2_d15N_1_SD
Date
Longitude
Latitude
Station
Thermo Finnigan Delta V isotope ratio mass spectrometer.
theme
None, User defined
cast
depth
sigma-theta potential density
nitrate plus nitrite
delta 15N NO3+NO2
date
longitude
latitude
station
featureType
BCO-DMO Standard Parameters
Isotope-ratio Mass Spectrometer
instrument
BCO-DMO Standard Instruments
OUTPACE
service
Deployment Activity
South west Pacific between New Caledonia and 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.
Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean
http://scope.soest.hawaii.edu/data/lava/lava.html
Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean
<p><em>NSF Award Abstract:</em><br />
The availability of nitrogen in the surface ocean plays a critical role regulating rates of primary productivity in the ocean, and thus through modification of the carbon cycle, nitrogen has the capacity to influence climate. The dominant source of biologically available nitrogen to the ocean is through a process known as di-nitrogen (N2) fixation, which involves the reduction of N2 gas dissolved in seawater to ammonium by microbes referred to as diazotrophs. While significant progress has been made identifying a diversity of marine diazotrophs in recent years using molecular tools, quantifying global rates of N2 fixation, and identifying which ocean basin supports the highest fluxes, has remained a vexing question. This research will quantify rates of N2 fixation as well as its importance for supporting production in the southwest Pacific Ocean. Results from this research will shed light on the sensitivities of N2 fixation (temperature, iron concentrations) as well as the extent of spatial and temporal coupling of nitrogen sources and sinks in the ocean. The work will be carried out by an early career scientist, and involve mentoring of young women, middle school girls and minorities, training of undergraduate and graduate researchers, and international collaborations.</p>
<p>Identifying the spatial distribution of the largest di-nitrogen (N2) fixation fluxes to the ocean remains a critical goal of chemical oceanography. The spatial distribution can inform our understanding of the environmental sensitivities of N2 fixation and the capacity for the dominant marine nitrogen (N) source and sink processes to respond to each other and thus influence the global carbon cycle and climate. In addition to temperature, two factors are at the heart of the current debate over what influences the spatial distribution of N2 fixation in the ocean: 1) the presence of adequate iron to meet the needs of N2 fixing microbes, and, 2) the absolute concentrations as well as ratios of surface ocean nitrate and phosphate concentrations that are low relative to the "Redfield" ratio, which are thought to favor N2 fixing microbes. This project will test the effects of gradients in atmospheric dust deposition on N2 fixation rates when surface waters have relatively constant but favorable nitrate to phosphate concentrations. The work will be carried out in the southwest Pacific, a region highlighted by new modeling work for its unique geochemical characteristics that are expected to favor significant N2 fixation fluxes. Nitrate+nitrite d15N as well as total dissolved nitrogen (TDN) concentration and d15N will be measured in water column samples collected on a French cruise and sediment traps were deployed to capture the sinking particulate N flux. The results will be compared with published work to evaluate which ocean regions support the largest N2 fixation fluxes.</p>
<p>More information:</p>
<p>This project was part of the Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) cruise in the Southwest Pacific between New Caledonia (166°28' E; 22°14' S) and Tahiti (149°36' W; 17°34' S) 0-2000 m<br />
* OUTPACE cruise (doi: <a href="http://dx.doi.org/10.17600/15000900" target="_blank">http://dx.doi.org/10.17600/15000900</a>)<br />
* OUTPACE website: <a href="https://outpace.mio.univ-amu.fr/?lang=en">https://outpace.mio.univ-amu.fr/?lang=en</a></p>
SW Pac N2 fixation
largerWorkCitation
project
eng; USA
oceans
South west Pacific between New Caledonia and Tahiti
168.0118
-172.7813
-19.9832
-18.179
2015-02-23
2015-03-30
Southwest Pacific Ocean between New Caledonia and Tahiti along ~18 deg S
0
BCO-DMO catalogue of parameters from Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the southwest Pacific Ocean between New Caledonia and Tahiti from February to March 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/733275.rdf
Name: Cast
Units: unitless
Description: <p>cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/733276.rdf
Name: Depth
Units: meters
Description: <p>depth of observation</p>
http://lod.bco-dmo.org/id/dataset-parameter/733277.rdf
Name: Sigma_theta
Units: kilograms per meter cubed (kg/m3)
Description: <p>potential density</p>
http://lod.bco-dmo.org/id/dataset-parameter/733278.rdf
Name: NO3_NO2
Units: micromole (uM)
Description: <p>nitrate+nitrite concentration ([NO3-+NO2-])</p>
http://lod.bco-dmo.org/id/dataset-parameter/733279.rdf
Name: NO3_NO2_d15N
Units: per mil
Description: <p>nitrate+nitrite d15N (NO3-+NO2- d15N)</p>
http://lod.bco-dmo.org/id/dataset-parameter/733280.rdf
Name: NO3_NO2_d15N_1_SD
Units: per mil
Description: <p>nitrate+nitrite d15N standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/733281.rdf
Name: Date
Units: unitless
Description: <p>Date of observation in four digit year; 2 digit month; 2 digit day (yyyymmdd) format</p>
http://lod.bco-dmo.org/id/dataset-parameter/733282.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Longitude with west negative.</p>
http://lod.bco-dmo.org/id/dataset-parameter/733283.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Latitude with south negative.</p>
http://lod.bco-dmo.org/id/dataset-parameter/733284.rdf
Name: Station
Units: unitless
Description: <p>name of the station</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
5510
https://darchive.mblwhoilibrary.org/bitstream/1912/10250/1/data_outpace-water-column-nitratenitrite.tsv
download
https://doi.org/10.1575/1912/bco-dmo.733303
download
onLine
dataset
<p>NO3-+NO2- d15N analysis was by the “denitrifier method” and followed the methods described by Sigman et al., 2001, Casciotti et al., 2002, McIlvin and Casciotti, 2011, and Weigand et al., 2016. Briefly, NO3-+NO2- was quantitatively reduced to N2O by Pseudomonas aureofaciens and Pseudomonas chlororaphis, which was then cryogenically focused and analyzed on an isotope ratio mass spectrometer. A volume of sample was added to each bacterial vial to achieve a final quantity of 10 or 20 nmols N2O, which was then purged from the vial using a helium carrier gas. The d15N of N2O in samples was calibrated with the international isotopic reference materials described in the Processing Description.</p>
Specified by the Principal Investigator(s)
<p>Nitrate+nitrite concentration was measured by others using colorimetric methods, and can be found at:<br />
http://www.obs-vlfr.fr/proof/php/outpace/outpace.php</p>
<p>The average precision of nitrate+nitrite d15N measurements was &lt;0.2 per mil, but with the standard deviation for duplicate analyses of each sample reported here. Samples were calibrated with IAEA N3 and USGS 34 NO3- d15N isotopic reference materials as described in McIlvin and Casciotti, 2011.&nbsp;</p>
<p><strong>BCO-DMO Processing Notes:</strong></p>
<ul>
<li>added conventional header with dataset name, PI name, version date.</li>
<li>modified parameter names to conform with BCO-DMO naming conventions.</li>
<li>re-formatted date from dd Month yyyy (day month year) to yyyymmdd.</li>
<li>appended date, latitude, and longitude to each data entry.</li>
<li>If an observation did not exist, 'nd' (no data) was inserted.&nbsp;</li>
</ul>
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
Thermo Finnigan Delta V isotope ratio mass spectrometer.
Thermo Finnigan Delta V isotope ratio mass spectrometer.
PI Supplied Instrument Name: Thermo Finnigan Delta V isotope ratio mass spectrometer. PI Supplied Instrument Description:Nitrate+nitrite d15N was measured using a Thermo Finnigan Delta V 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/
Cruise: OUTPACE
OUTPACE
R/V L'Atalante
Community Standard Description
International Council for the Exploration of the Sea
R/V L'Atalante
vessel
OUTPACE
Thierry Moutin
Mediterranean Institute of Oceanography
R/V L'Atalante
Community Standard Description
International Council for the Exploration of the Sea
R/V L'Atalante
vessel