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snippet: The map of &#948 15N values in surface sediments (0-1 cm) collected in the German Bight and German EEZ depicts the halo of man-made eutrophication resulting...
summary: The map of &#948 15N values in surface sediments (0-1 cm) collected in the German Bight and German EEZ depicts the halo of man-made eutrophication resulting...
accessInformation: HZG Helmholtz-Zentrum Geesthacht
thumbnail: thumbnail/thumbnail.JPEG
typeKeywords: ["Data","Service","Image Service","ArcGIS Server"]
MinScale: 5.0E7
description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The ratio of two stable isotopes (14N, 15N) in sediments reflects the origin and history of nitrogen in the water column and is an indicator for eutrophication. Sedimentary nitrogen mirrors the isotope ratio of dissolved nitrate that has been assimilated into organic matter by plankton and has sedimented as detritus. The ratio is expressed as &amp;#94815N values of nitrogen, and is given in permil (‰) relative to the ratio of the standard (&amp;#94815N in air N2 = 0‰). In the German Bight and EEZ, the dissolved nitrate that is assimilated and transferred to sedimentary nitrogen originates from 2 main sources with distinct isotopic composition: Nitrate discharged by rivers draining cultivated catchments has high &amp;#94815N values (~ 9‰); such high values are a characteristic of riverborne nitrate that causes eutrophication of coastal areas. In contrast, nitrate in water masses of Atlantic origin advected into the German Bight with the mean circulation has low &amp;#94815N values (~5‰). The map of &amp;#94815N 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 &amp;#94815N discharged by rivers. Analysis of &amp;#94815N in dated sediment cores puts the onset of eutrophication near 1900 AD, expressed by a marked (by 1.5‰) increase of &amp;#94815N values at that time, which indicates the input of surplus nitrogen from rivers at that time .</SPAN></P></DIV></DIV></DIV>
licenseInfo: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Not to be used for commercial purposes</SPAN></P></DIV></DIV></DIV>
catalogPath:
title: Delta 15N
type: Image Service
url: https://rzsv0280.fzg.local:6443/arcgis/services/NOAH_geoDB/D15N/ImageServer
tags: ["NOAH","BiogchemestryKey4","Delta 15N","&delta","&#948"]
culture: de-DE
name: D15N
guid:
MaxScale: 5000.0
spatialReference: GCS_WGS_1984