Dempsey Britton britton.dempsey@dal.ca 0009-0003-2353-0602 Dalhousie University https://ror.org/01e6qks80 Kam Kitty kitty.kam@dal.ca Dalhousie University https://ror.org/01e6qks80 Rondón Anadiuska N arondon@dal.ca Dalhousie University https://ror.org/01e6qks80 Wallace Douglas WR douglas.wallace@dal.ca http://oceanography.dal.ca/person/Wallace_Douglas.html Dalhousie University https://ror.org/01e6qks80 Buchwald Carolyn Dalhousie University https://ror.org/01e6qks80 2026 Nitrate concentration and nitrate stable isotopic signatures in seawater in the Labrador Sea in spring 2022 dataset https://doi.org/10.1594/PANGAEA.986850 2026-02-12T06:16:35 Seawater was collected for nitrate concentration and stable isotopic analyses between May 20th and May 25th, 2022 aboard RV Celtic Explorer in an area between 58 - 59 degrees N and 49 - 50 degrees W. Nitrate concentration samples were collected from the Niskin unfiltered into 15ml centrifuge tubes and immediately frozen at -20 degrees C. After the survey, these samples were then thawed to room temperature and analyzed using standard colorimetric protocols coupled with a continuous flow nutrient analyzer at the Canada Excellence Research Chairs (CERC) laboratory at Dalhousie University. Sampling for nitrate stable isotopic measurements was conducted by filtering seawater directly from the Niskin-rosette using 0.22 µm polyethersulfone (PES) syringe filters (VWR Cat. no. 76479-018) and collected into 60 mL HDPE bottles, which were then immediately frozen upright at -20 degrees C. Isotopic analyses were prepared in duplicate using the denitrifier method (McIlvin and Casciotti, 2011; doi:10.1021/ac1028984), and analyzed using isotope ratio mass spectrometery (IRMS) on a Thermo Delta V located in the Canada Excellence Research Chairs (CERC) laboratory at Dalhousie University. Samples with detectable nitrite (>0.1 µmol/l) concentrations were first treated with sulfamic acid to remove potential interference on the 15N-NO3 pool as the denitrifier method does not discriminate between nitrate or nitrite (Granger and Sigman, 2009; doi:10.1002/rcm.4307). Isotopic analyses were referenced against USGS32, USGS34, and IAEA-NO3 reference materials. Granger Julie jgranger@uconn.edu 0000-0001-9985-9242 Sigman Daniel M sigman@princeton.edu http://www.princeton.edu/sigman/ 0000-0002-7923-1973 2009 Removal of nitrite with sulfamic acid for nitrate N and O isotope analysis with the denitrifier method journal article Rapid Communications in Mass Spectrometry 23(23) https://doi.org/10.1002/rcm.4307 3753-3762 McIlvin Matthew R Casciotti Karen L kcasciotti@stanford.edu 0000-0002-5286-7795 2011 Technical Updates to the Bacterial Method for Nitrate Isotopic Analyses journal article Analytical Chemistry 83(5) https://doi.org/10.1021/ac1028984 1850-1856 -49.61009999999999 -49.110000000000014 58.4833 58.8167 -49.29059999999998 58.67778333333333 2022-05-20T16:47:00 2022-05-25T14:15:00 5.0 2000.0 vertical profile Natural Sciences and Engineering Research Council NSERC http://www.nserc-crsng.gc.ca/index_eng.asp https://doi.org/10.13039/501100000038 NWA-BCP The Northwest Atlantic Biological Carbon Pump Ocean Frontier Institute https://doi.org/10.13039/501100010784 NWA-BCP The Northwest Atlantic Biological Carbon Pump https://www.ofi.ca/programs/safe-and-sustainable/project/the-northwest-atlantic-biological-carbon-pump CE22009_4_Day CTD_cast_8 58.8167 -49.11 2022-05-20T16:47:00 Labrador Sea CE22009 BELAS-1 https://download.pangaea.de/reference/134405/attachments/nwa-bcp_cruise_report_CE22009.pdf Ward, Brian 2022-05-11 2022-06-10 Galway, Ireland Galway, Ireland Celtic Explorer https://www.marine.ie/site-area/infrastructure-facilities/research-vessels/celtic-explorer EIGB 9244439 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CE22009_6_Day CTD_cast_11 58.8167 -49.4434 2022-05-21T16:28:00 Labrador Sea CE22009 BELAS-1 https://download.pangaea.de/reference/134405/attachments/nwa-bcp_cruise_report_CE22009.pdf Ward, Brian 2022-05-11 2022-06-10 Galway, Ireland Galway, Ireland Celtic Explorer https://www.marine.ie/site-area/infrastructure-facilities/research-vessels/celtic-explorer EIGB 9244439 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CE22009_8_Day CTD_cast_17 58.65 -49.6101 2022-05-23T12:14:00 Labrador Sea CE22009 BELAS-1 https://download.pangaea.de/reference/134405/attachments/nwa-bcp_cruise_report_CE22009.pdf Ward, Brian 2022-05-11 2022-06-10 Galway, Ireland Galway, Ireland Celtic Explorer https://www.marine.ie/site-area/infrastructure-facilities/research-vessels/celtic-explorer EIGB 9244439 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CE22009_9_Day CTD_cast_14 58.65 -49.3601 2022-05-22T12:28:00 Labrador Sea CE22009 BELAS-1 https://download.pangaea.de/reference/134405/attachments/nwa-bcp_cruise_report_CE22009.pdf Ward, Brian 2022-05-11 2022-06-10 Galway, Ireland Galway, Ireland Celtic Explorer https://www.marine.ie/site-area/infrastructure-facilities/research-vessels/celtic-explorer EIGB 9244439 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CE22009_11_Day CTD_cast_21 58.65 -49.11 2022-05-24T11:40:00 Labrador Sea CE22009 BELAS-1 https://download.pangaea.de/reference/134405/attachments/nwa-bcp_cruise_report_CE22009.pdf Ward, Brian 2022-05-11 2022-06-10 Galway, Ireland Galway, Ireland Celtic Explorer https://www.marine.ie/site-area/infrastructure-facilities/research-vessels/celtic-explorer EIGB 9244439 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CE22009_12_Day CTD_cast_25 58.4833 -49.11 2022-05-25T14:15:00 Labrador Sea CE22009 BELAS-1 https://download.pangaea.de/reference/134405/attachments/nwa-bcp_cruise_report_CE22009.pdf Ward, Brian 2022-05-11 2022-06-10 Galway, Ireland Galway, Ireland Celtic Explorer https://www.marine.ie/site-area/infrastructure-facilities/research-vessels/celtic-explorer EIGB 9244439 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers 345 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Event label Event Buchwald Carolyn Event Latitude of event Latitude Buchwald Carolyn Latitude Longitude of event Longitude Buchwald Carolyn Longitude Date/Time of event Date/Time Buchwald Carolyn Date/Time DEPTH, water Depth water m depth http://purl.obolibrary.org/obo/PATO_0001595 water http://purl.obolibrary.org/obo/CHEBI_15377 Length L http://dbpedia.org/resource/Length Buchwald Carolyn Depth water [m] Nitrate [NO3]- µmol/l nitrate http://purl.obolibrary.org/obo/CHEBI_17632 Molar Concentration Automated wet chemistry analyzer, SKALAR, SAN++ Wallace Douglas WR douglas.wallace@dal.ca http://oceanography.dal.ca/person/Wallace_Douglas.html [NO3]- [µmol/l] δ15N, nitrate δ15N NO3 ‰ air δ15N http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes nitrate http://purl.obolibrary.org/obo/CHEBI_17632 Denitrifier method (McIlvin and Casciotti, 2011); measured with an isotope ratio mass spectrometer (IRMS), Thermo delta V Buchwald Carolyn Vs. 15N of N2 in air δ15N NO3 [‰ air] δ15N, nitrate, standard deviation δ15N NO3 std dev ± δ15N http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes nitrate http://purl.obolibrary.org/obo/CHEBI_17632 standard deviation std dev https://en.wikipedia.org/wiki/Standard_deviation Denitrifier method (McIlvin and Casciotti, 2011); measured with an isotope ratio mass spectrometer (IRMS), Thermo delta V Buchwald Carolyn Vs. 15N of N2 in air δ15N NO3 std dev [±] δ18O, nitrate δ18O NO3 ‰ δ18O http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes nitrate http://purl.obolibrary.org/obo/CHEBI_17632 Denitrifier method (McIlvin and Casciotti, 2011); measured with an isotope ratio mass spectrometer (IRMS), Thermo delta V Buchwald Carolyn Vs. 18O of Vienna standard mean ocean water (VSMOW) δ18O NO3 [‰] δ18O, nitrate, standard deviation δ18O NO3 std dev ± Denitrifier method (McIlvin and Casciotti, 2011); measured with an isotope ratio mass spectrometer (IRMS), Thermo delta V Buchwald Carolyn Vs. 18O of Vienna standard mean ocean water (VSMOW) δ18O NO3 std dev [±] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Labrador Sea nitrate concentration in sea water stable nitrogen isotope (δ15N) author108171 author113104 author113105 author20243 author23870 author64071 author69649 author71061 author74102 award4108 award4109 basis4274 campaign52437 curlevel30 event3283325 event3283326 event3283327 event3283328 event3283329 event3283330 funder20818 funder21056 geocode1599 geocode1600 geocode1601 geocode1619 inst21772 journal13689 journal957 license21 method10923 method15594 method18350 param136511 param191621 param24647 param756 param98544 pi20243 pi69649 ref124587 ref135757 term1073092 term1073093 term1073131 term1073482 term21123 term2299371 term2606205 term37764 term43863 term44030 term67626 term68026 term72012 term76750 term835 topotype3