Nitrate concentration and nitrate stable isotopic signatures in seawater in the Labrador Sea in spring 2022
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2026
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| _version_ | 1867171901731766272 |
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| author | Dempsey, Britton Kam, Kitty Rondón, Anadiuska N Wallace, Douglas WR Buchwald, Carolyn |
| author_facet | Dempsey, Britton Kam, Kitty Rondón, Anadiuska N Wallace, Douglas WR Buchwald, Carolyn |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_986850 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Nitrate concentration and nitrate stable isotopic signatures in seawater in the Labrador Sea in spring 2022 Dempsey, Britton Kam, Kitty Rondón, Anadiuska N Wallace, Douglas WR Buchwald, Carolyn Automated wet chemistry analyzer, SKALAR, SAN++; BELAS-1; CE22009; CE22009_11_Day; CE22009_12_Day; CE22009_4_Day; CE22009_6_Day; CE22009_8_Day; CE22009_9_Day; Celtic Explorer; CTD_cast_11; CTD_cast_14; CTD_cast_17; CTD_cast_21; CTD_cast_25; CTD_cast_8; CTD/Rosette; CTD-RO; Date/Time of event; Denitrifier method (McIlvin and Casciotti, 2011); measured with an isotope ratio mass spectrometer (IRMS), Thermo delta V; DEPTH, water; Event label; Labrador Sea; Latitude of event; Longitude of event; Nitrate; nitrate concentration in sea water; stable nitrogen isotope (δ15N); δ15N, nitrate; δ15N, nitrate, standard deviation; δ18O, nitrate; δ18O, nitrate, standard deviation 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. |
| title | Nitrate concentration and nitrate stable isotopic signatures in seawater in the Labrador Sea in spring 2022 |
| topic | Automated wet chemistry analyzer, SKALAR, SAN++; BELAS-1; CE22009; CE22009_11_Day; CE22009_12_Day; CE22009_4_Day; CE22009_6_Day; CE22009_8_Day; CE22009_9_Day; Celtic Explorer; CTD_cast_11; CTD_cast_14; CTD_cast_17; CTD_cast_21; CTD_cast_25; CTD_cast_8; CTD/Rosette; CTD-RO; Date/Time of event; Denitrifier method (McIlvin and Casciotti, 2011); measured with an isotope ratio mass spectrometer (IRMS), Thermo delta V; DEPTH, water; Event label; Labrador Sea; Latitude of event; Longitude of event; Nitrate; nitrate concentration in sea water; stable nitrogen isotope (δ15N); δ15N, nitrate; δ15N, nitrate, standard deviation; δ18O, nitrate; δ18O, nitrate, standard deviation |
| url | https://doi.org/10.1594/PANGAEA.986850 |