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Delta 15N


Metadata
File Identifier: 95648362-9967-4381-B9D0-631D934DE8BA
Metadata Language: English
: utf8
Resource Type: Dataset
Responsible Party:
Individual Name: Ulrike Kleeberg
Organisation Name: HZG Helmholtz-Zentrum Geesthacht
Role: Point Of Contact
Contact Info:
E-Mail Address: ulrike.kleeberg@hzg.de
Responsible Party:
Individual Name: Prof. Dr. Kay-Christian Emeis
Organisation Name: HZG Helmholtz-Zentrum Geesthacht
Role: Point Of Contact
Contact Info:
E-Mail Address: kay.emeis@hzg.de
Metadata Date: 2016-06-13
Metadata Standard Name: INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119
Metadata Standard Version: V. 1.2
Service Identification
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.
Thumbnail:
Browse Graphic: https://coastmap.hzg.de/server/rest/directories/thumbs/D15N_thumb_v2.png
Citation:
Title: Delta 15N
Date:
Date: 2016-06-10
Date Type: Creation Date
Identifier: 95648362-9967-4381-B9D0-631D934DE8BA-DI
Individual Name: Prof. Dr. Kay-Christian Emeis
Organisation Name: HZG Helmholtz-Zentrum Geesthacht
Role: Principal Investigator
Point Of Contact:
Individual Name: Prof. Dr. Kay-Christian Emeis
Organisation Name: HZG Helmholtz-Zentrum Geesthacht
Role: Principal Investigator
Contact Info:
E-Mail Address: kay.emeis@uni-hamburg.de
Individual Name: Ulrike Kleeberg
Organisation Name: HZG Helmholtz-Zentrum Geesthacht
Role: Processor
Contact Info:
E-Mail Address: ulrike.kleeberg@hzg.de
Keyword Collection:
Keyword: NOAH
Keyword: Delta 15N
Keyword: BiogchemestryKey4
Keyword: Live Data and Maps
Service Type: ESRI ArcGIS Mapping Service
Service type version: 1.1.3
Extent:
West Bounding Longitude: 3.330163
East Bounding Longitude: 9.068751
North Bounding Latitude: 56.073062
South Bounding Latitude: 53.27734
West Bounding Longitude: 3.330163
East Bounding Longitude: 9.068751
North Bounding Latitude: 56.073062
South Bounding Latitude: 53.27734
Constraints: none
Legal Constraints:
Access Constraints: Intellectual Property Rights
Use Constraints: Intellectual Property Rights
Other Constraints: no limitations on public access
Distribution
Distribution Format:
Format Name: ArcGIS Service
Format Version: 10.3
Transfer Options:
URL: https://coastmap.hzg.de/server/rest/services/NOAH_geoDB/D15N/ImageServer
Protocol:
Application Profile:
Function: Information
Quality
Scope: Dataset
Conformance Result:
Validation Performed: true
Explanation: none
Specification:
Title: INSPIRE Directive 2007/2/EC
Date:
Date: 2010-07-02
Date Type: Creation Date
Lineage: 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.)
/geoportal/rest/document?f=html&id=%7B6728854B-B998-4092-B99F-9AEF6A966C4A%7D
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