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| Titel |
The complementary power of pH and lake-water organic carbon reconstructions for discerning the influences on surface waters across decadal to millennial time scales |
| VerfasserIn |
P. Rosén, R. Bindler, T. Korsman, T. Mighall, K. Bishop |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 9 ; Nr. 8, no. 9 (2011-09-27), S.2717-2727 |
| Datensatznummer |
250006131
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| Publikation (Nr.) |
 copernicus.org/bg-8-2717-2011.pdf |
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| Zusammenfassung |
| Lysevatten, a lake in southwest Sweden, has experienced both
acidification and recent changes in the amount of lake-water organic carbon
(TOC), both causing concern across Europe and North America. A range of
paleolimnological tools – diatom-inferred pH, inferred lake-water TOC from
visible-near-infrared spectroscopy (VNIRS), multi-element geochemistry and
pollen analysis, combined with geochemical modeling were used to reconstruct
the lake's chemistry and surroundings back to the most recent deglaciation
12 500 years ago. The results reveal that the recent anthropogenic impacts
are similar in magnitude to the long-term variation driven by natural
catchment changes and early agricultural land use occurring over centuries
and millennia. The combined reconstruction of both lake-water TOC and
lithogenic element delivery can explain the major changes in lake-water pH
and modeled acid neutralizing capacity during the past 12 500 years. The
results raise important questions regarding what precisely comprises
"reference" conditions (i.e., free from human impacts) as defined in the
European Water Framework Directive. |
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