http://lod.bco-dmo.org/id/dataset/782518
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
2019-11-21
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Water column nitrate+nitrite d15N and d18O from samples collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018
2019-11-21
publication
2019-11-21
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2019-11-26
publication
https://doi.org/10.1575/1912/bco-dmo.782518.1
Angela N. Knapp
Florida State 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: Knapp, A. (2019) Water column nitrate+nitrite d15N and d18O from samples collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-11-21 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.782518.1 [access date]
Dataset Description: <p>This data set includes water column nitrate+nitrite d15N and d18O measurements from the Gulf of Mexico and Florida Straits. These measurements were used to address whether Mississippi River nitrate is entrained in Loop Current waters and potentially exported from the Gulf of Mexico to the North Atlantic.&nbsp; Water samples were collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018.</p> Methods and Sampling: Water column samples were collected by Niskin bottle on a CTD rosette (“CTD profile”). NO3-+NO2- concentration was measured using a chemiluminescent method described by Braman and Hendrix, 1989, with a detection limit of 0.1 µM. NO3-+NO2- d15N and d18O analyses were 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.
The average precision of the nitrate+nitrite concentration measurement was <0.2 µM. The average precision of nitrate+nitrite d15N measurements was <0.2 per mil and for d18O was <0.3 per mil, but with the standard deviation for duplicate analyses of each sample reported here. NO3-+NO2- δ15N δ18O analyses were calibrated with IAEA N3 and USGS 34 NO3- d15N isotopic reference materials as described in McIlvin and Casciotti, 2011. NO3-+NO2- d18O were also calibrated with the USGS 35 isotopic reference material as described in McIlvin and Casciotti, 2011.
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
asNeeded
Dataset Version: 1
Unknown
Cruise_ID
Sampling_Date
Latitude
Longitude
Depth
SigmaTheta
NO3_NO2
NO3_NO2_d15N
NO3_NO2_d18O
sal
temp
Thermo 42i NOx analyzer
Thermo Finnigan Delta V isotope ratio mass spectrometer
theme
None, User defined
Cruise identfier
date
latitude
longitude
depth
sigma-theta potential density
nitrate plus nitrite
d15N
d18O_NO3
salinity
water temperature at measurement depth
featureType
BCO-DMO Standard Parameters
Gas Analyzer
Mass Spectrometer
instrument
BCO-DMO Standard Instruments
WS1114
PE17-24
PE18-23
service
Deployment Activity
Florida Straits
Northern Gulf of Mexico
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
Florida Straits; Northern Gulf of Mexico
-92.0401
-79.5
25.866
27
2011-11-22
2018-04-20
Southwest Pacific Ocean between New Caledonia and Tahiti along ~18 deg S
0
BCO-DMO catalogue of parameters from Water column nitrate+nitrite d15N and d18O from samples collected during R/V Pelican and R/V F.G. Walton Smith cruises in the Gulf of Mexico and Florida Straits between 2011 and 2018
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/783014.rdf
Name: Cruise_ID
Units: unitless
Description: <p>Rolling Deck Repository or other cruise identifier</p>
http://lod.bco-dmo.org/id/dataset-parameter/783015.rdf
Name: Sampling_Date
Units: unitless
Description: <p>Date on which the sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/783016.rdf
Name: Latitude
Units: decimal degrees
Description: <p>latitude at which the sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/783017.rdf
Name: Longitude
Units: decimal degrees
Description: <p>longitude at which the sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/783018.rdf
Name: Depth
Units: meters (m)
Description: <p>Depth at which the sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/783019.rdf
Name: SigmaTheta
Units: unitless
Description: <p>Potential Density of depth at which sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/783020.rdf
Name: NO3_NO2
Units: micro molar (µM)
Description: <p>Concentration of nitrate+nitrite in a sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/783021.rdf
Name: NO3_NO2_d15N
Units: per mil (0/00) vs. N2 in air
Description: <p>Nitrogen isotopic composition of nitrate+nitrite in a sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/783022.rdf
Name: NO3_NO2_d18O
Units: per mil (0/00) vs. VSMOW
Description: <p>Oxygen isotopic composition of nitrate+nitrite in a sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/783023.rdf
Name: sal
Units: Practical Salinity Units (PSU)
Description: <p>salinity of the sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/783024.rdf
Name: temp
Units: degrees Celsius
Description: <p>temperature of the sample</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
6479
https://darchive.mblwhoilibrary.org/bitstream/1912/24900/1/dataset-782518_gulf-mexico-no3-isotopes__v1.tsv
download
https://doi.org/10.1575/1912/bco-dmo.782518.1
download
onLine
dataset
Water column samples were collected by Niskin bottle on a CTD rosette (“CTD profile”). NO3-+NO2- concentration was measured using a chemiluminescent method described by Braman and Hendrix, 1989, with a detection limit of 0.1 µM. NO3-+NO2- d15N and d18O analyses were 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.
The average precision of the nitrate+nitrite concentration measurement was <0.2 µM. The average precision of nitrate+nitrite d15N measurements was <0.2 per mil and for d18O was <0.3 per mil, but with the standard deviation for duplicate analyses of each sample reported here. NO3-+NO2- δ15N δ18O analyses were calibrated with IAEA N3 and USGS 34 NO3- d15N isotopic reference materials as described in McIlvin and Casciotti, 2011. NO3-+NO2- d18O were also calibrated with the USGS 35 isotopic reference material as described in McIlvin and Casciotti, 2011.
Specified by the Principal Investigator(s)
<p>BCO-DMO Data Manager Processing Notes:<br />
* converted xlsx file to csv<br />
* latitude and longitude exported with 4 decimal places<br />
* added a conventional header with dataset name, PI name, version date<br />
* modified parameter names to conform with BCO-DMO naming conventions<br />
* blank values in this dataset are displayed as "nd" for "no data."&nbsp; nd is the default missing data identifier in the BCO-DMO system.<br />
* Date format converted to ISO 8601 format yyyy-mm-dd<br />
*&nbsp; Columns SigmaTheta,NO3_NO2,NO3_NO2_d15N, NO3_NO2_d18O, sal ,&nbsp;temp rounded to two decimal places.</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
Thermo 42i NOx analyzer
Thermo 42i NOx analyzer
PI Supplied Instrument Name: Thermo 42i NOx analyzer PI Supplied Instrument Description:Nitrate+nitrite concentration was measured on a Thermo 42i NOx analyzer. Instrument Name: Gas Analyzer Instrument Short Name:Gas Analyzer Instrument Description: Gas Analyzers - Instruments for determining the qualitative and quantitative composition of gas mixtures.
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: Mass Spectrometer Instrument Short Name:Mass Spec Instrument Description: General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
Cruise: WS1114
WS1114
R/V F.G. Walton Smith
Community Standard Description
International Council for the Exploration of the Sea
R/V F.G. Walton Smith
vessel
WS1114
Ryan Smith
National Oceanic and Atmospheric Administration
Cruise: PE17-24
PE17-24
R/V Pelican
Community Standard Description
International Council for the Exploration of the Sea
R/V Pelican
vessel
PE17-24
Marcus Ogle
Cruise: PE18-23
PE18-23
R/V Pelican
Community Standard Description
International Council for the Exploration of the Sea
R/V Pelican
vessel
PE18-23
Paul Williams
Fugro Environmental
R/V F.G. Walton Smith
Community Standard Description
International Council for the Exploration of the Sea
R/V F.G. Walton Smith
vessel
R/V Pelican
Community Standard Description
International Council for the Exploration of the Sea
R/V Pelican
vessel