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| Titel |
Paleoenvironmental reconstruction using nitrogen and carbon contents and isotopes in lake sediments of Tiefer See, NE Germany |
| VerfasserIn |
Birgit Plessen, Ulrike Kienel, Nadine Dräger, Achim Brauer |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127173
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| Publikation (Nr.) |
 EGU/EGU2016-7016.pdf |
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| Zusammenfassung |
| Lake Tiefer See (Mecklenburg/Germany) is a seasonally stratified lake formed
in a north-south directed subglacial channel system with a maximum depth of 63 m. In
order to understand the lake productivity and nitrogen cycle depending on
natural variability and anthropogenic forcing, we compared the recent input
and productivity, monitored in sediment traps in the hypo-, meta- and
epilimnion since 2012 with the sedimentary record of the last 400 years.
Light stable isotopes of nitrogen and carbon are interpreted to reflect
human impact by extensive land use, manure, sewage input, and atmospheric
nitrogen compounds. The sediment trap material clearly shows high $\delta
^{15}$N (+7 to +14\permil\ ), and low $\delta ^{13}$C$_{org}$
(-28 to -33\permil\ ) values, whereas surface soil and
terrestrial plant materials are characterised by lower $\delta ^{15}$N (+3
to +6\permil\ ), and higher $\delta ^{13}$C$_{org}$ (-28 to
-25\permil\ ) values. Recent high $\delta ^{15}$N$_{NO$_3$}
values of up to +15\permil\ in the epilimnion water together
with low $\delta ^{18}$O $ |
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