Delta 15N

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          Ulrike Kleeberg
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          HZG Helmholtz-Zentrum Geesthacht
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          Prof. Dr. Kay-Christian Emeis
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          HZG Helmholtz-Zentrum Geesthacht
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      citation: 
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          title: 
              Delta 15N
          date: 
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                  2016-06-10
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                  Prof. Dr. Kay-Christian Emeis
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                  HZG Helmholtz-Zentrum Geesthacht
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      abstract: 
          The ratio of two stable isotopes (14N, 15N; expressed as delta15N relative to air N2 = 0‰) in sediments 
          reflects the origin and history of nitrogen in the water column. Sedimentary nitrogen traces the Delta15N of 
          dissolved nitrate and sedimenting organic matter. In the German Bight and EEZ, the dissolved nitrate 
          originates from 2 main sources: Nitrate discharged by rivers draining cultivated catchments has high Delta 
          15N values (~ 9‰) characteristic of river loads causing eutrophication of coastal areas. Nitrate in water 
          masses of Atlantic origin advected into the German Bight has low Delta 15N values (~5‰). The map of Delta 
          15N values in surface sediments (0-1 cm) collected in the German Bight and German EEZ depicts the halo of 
          high Delta15N resulting from river nitrate.
      purpose: 
          The map of Delta 15N values in surface sediments (0-1 cm) collected in the German Bight and German EEZ depicts 
          the halo of man-made eutrophication resulting from nitrate with tell-tale high Delta 15N discharged by rivers.
      credit: 
          HZG Helmholtz-Zentrum Geesthacht
      pointOfContact: 
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          individualName: 
              Prof. Dr. Kay-Christian Emeis
          organisationName: 
              HZG Helmholtz-Zentrum Geesthacht
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                      kay.emeis@uni-hamburg.de
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      pointOfContact: 
        CI_ResponsibleParty: 
          individualName: 
              Ulrike Kleeberg
          organisationName: 
              HZG Helmholtz-Zentrum Geesthacht
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                      ulrike.kleeberg@hzg.de
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              Delta 15N
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          statement: 
              Ordinary Kriging from a total of 311 samples. The samples were collected during various cruises over the 
              years 2000 to 2014.
              Ratios of 15N/14N of particulate nitrogen (d15NPN) were determined using a Thermo Finnigan MAT 252 isotope 
              ratio mass spectrometer connected with a ConFlo-III interface after high-temperature flash combustion 
              (University of Hamburg) in a Thermo FinniganE A 1112 at 1050 °C, or with a Thermo Delta XP mass 
              spectrometer after combustion in a Thermo Flash EA 1112 at 1050°C (HZG). Isotope ratios are reported in 
              ‰ using the delta notation d15Nsample = ((15N/14N)sample / (15N/14N)reference -1) x 1000. Pure tank N2 
              calibrated against the reference standards IAEA-N1 (ammonium sulfate, d15N = + 0.4 ‰) and IAEA-N2 
              (ammonium sulfate, d15N = + 20.3 ‰) of the International Atomic Energy Agency was used as a working 
              standard. d15N is given as the per mil deviation from the N-isotope composition of atmospheric N2. 
              Duplicate measurements of samples differ by less than 0.2 ‰. The laboratories´ long-term 2s standard 
              deviation for IAEA-N1 standard is 0.09 ‰. An intercalibration exercise (Bahlmann et al., 2010) involving 
              the two laboratories for the data presented here showed that the analytical precision (1 s) averaged 
              0.24‰, ranging from 0.18–0.31‰ for individual samples over a wide range of TN concentrations. (Bahlmann, 
              E., S. M. Bernasconi, S. Bouillon, M. Houtekamer, M. Korntheuer, F. Langenberg, C. Mayr, M. Metzke, J. 
              J. Middelburg, B. Nagel, U. Struck, M. Voss and K. C. Emeis (2010). "Performance evaluation of nitrogen 
              isotope ratio determination in marine and lacustrine sediments: An inter-laboratory comparison." Organic 
              Geochemistry 41(1): 3-12.)
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