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OAS accession Detail for 0278067
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| accessions_id: | 0278067 | archive |
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| Title: | Water column nitrate+nitrite d15N and d18O and total dissolved nitrogen d15N measurements from R/V Ka`imikai-O-Kanaloa cruise KOK1806 (HOT LAVA) in July 2018 (NCEI Accession 0278067) |
| Abstract: | This dataset contains chemical data collected on R/V Ka`imikai-O-Kanaloa during cruise KOK1806 in the North Pacific Ocean on 2018-07-14. These data include Total Dissolved Nitrogen, depth, and nitrate plus nitrite. The instruments used to collect these data include GeoFish Towed near-Surface Sampler, Isotope-ratio Mass Spectrometer, and Niskin bottle. These data were collected by Angela N. Knapp of Florida State University as part of the "Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean (SW Pac N2 fixation)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-06-18. The following is the text of the dataset description provided by BCO-DMO: Water column nitrate+nitrite d15N and d18O and total dissolved nitrogen d15N measurements Dataset Description: This data set includes water column nitrate+nitrite and total dissolved nitrogen d15N measurements. These measurements were used to address the source of nitrate+nitrite in surface waters observed after the 2018 Kilauea eruption entered the ocean, leading to enhanced surface ocean chlorophyll. The results are consistent with an upwelling source of nitrate+nitrite from ~400 m driven by hot lava entering the ocean, leading to increased buoyancy of waters, driving "roils" (see F. J. Sansone, and J. A. Resing, 1995, J. Geophys. Res. Oceans). These data are also used as evidence that biological nitrogen fixation did not contribute to the nitrate+nitrite observed in surface waters. |
| Date received: | 20190618 |
| Start date: | 20180714 |
| End date: | 20180714 |
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| West boundary: | -154.829 |
| East boundary: | -154.71 |
| North boundary: | 19.45 |
| South boundary: | 19.373 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Some water samples were collected by Niskin bottle on a CTD rosette ("CTD profile"), while others were collected using a trace metal clean "Towfish" that was running along side the ship and collected trace metal clean underway samples ~1 m below the sea surface. NO3-+NO2- d15N and d18O and TDN δ15N 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 The δ15N of TDN was measured using persulfate oxidation of DON to NO3- followed by the denitrified method as described in Knapp et al. (2005). Nitrate+nitrite concentration was measured by others (Karl lab, U. Hawaii) using colorimetric methods, and total dissolved nitrogen concentration was measured by others (Karl lab, U. Hawaii) using uv-oxidation and subsequent colorimetric analysis. Both of these data sets can be found at: http://scope.soest.hawaii.edu/data/ |
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| Metadata version: | 1 |
| Keydate: | 2023-05-12 03:58:40+00 |
| Editdate: | 2023-05-12 03:59:12+00 |