Universität zu Köln

Zanchetta, Giovanni, Baneschi, Ilaria, Francke, Alexander ORCID: 0000-0002-0370-5802, Boschi, Chiara, Regattieri, Eleonora ORCID: 0000-0003-0089-4027, Wagner, Bernd ORCID: 0000-0002-1369-7893, Lacey, Jack H. ORCID: 0000-0002-6329-2149, Leng, Melanie J., Vogel, Hendrik ORCID: 0000-0002-9902-8120 and Sadori, Laura ORCID: 0000-0002-2774-6705 (2018). Evidence for carbon cycling in a large freshwater lake in the Balkans over the last 0.5 million years using the isotopic composition of bulk organic matter. Quat. Sci. Rev., 202. S. 154 - 166. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

In the DEEP core from the Lake Ohrid ICDP drilling project, the carbon isotope composition of bulk organic matter (delta C-13(TOC)) over the last 516 ka shows a negative correlation with total organic carbon (TOC) and total inorganic carbon (TIC). This relationship is marked by periods of lower delta C-13(TOC) values corresponding to higher TIC and TOC. Along with TOC/TN, the correlation between delta C-13(TOC) and delta C-13(TIC) suggests that most of the organic matter in the core is from aquatic primary production within the lake. The combination of TOC, TIC, and delta C-13(TOC) is able to disentangle long-term glacial/interglacial cycles and, to a lesser extent, millennial scale climate variability. Over the longer term, delta C-13(TOC) shows modest variability, indicating that the delta C-13 of the dissolved inorganic carbon (DIC) pool is stabilised by the supply of karst spring water characterised by delta C-13(DIC) influenced by the bedrock delta C-13 value, and the long residence time of the lake water and well mixed upper water column promoting equilibration with atmospheric CO2. However, comparison between arboreal pollen (AP%), TIC and TOC data indicates that the delta C-13(TOC) signal is modulated by the leaching of soil CO2 through runoff and spring discharge, changes in primary productivity, and recycling of organic matter within the lake, all affecting delta C-13(DIC). Exceptionally low delta C-13(TOC) during some interglacial periods (e.g. MIS7 and MIS9) possibly indicate rapid intensification of organic matter recycling and/or increasing stratification and enhanced methanogenesis, even if the latter process is not supported by the sedimentological data. (C) 2018 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zanchetta, Giovanni UNSPECIFIED UNSPECIFIED UNSPECIFIED Baneschi, Ilaria UNSPECIFIED UNSPECIFIED UNSPECIFIED Francke, Alexander UNSPECIFIED orcid.org/0000-0002-0370-5802 UNSPECIFIED Boschi, Chiara UNSPECIFIED UNSPECIFIED UNSPECIFIED Regattieri, Eleonora UNSPECIFIED orcid.org/0000-0003-0089-4027 UNSPECIFIED Wagner, Bernd UNSPECIFIED orcid.org/0000-0002-1369-7893 UNSPECIFIED Lacey, Jack H. UNSPECIFIED orcid.org/0000-0002-6329-2149 UNSPECIFIED Leng, Melanie J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vogel, Hendrik UNSPECIFIED orcid.org/0000-0002-9902-8120 UNSPECIFIED Sadori, Laura UNSPECIFIED orcid.org/0000-0002-2774-6705 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-161959
DOI:	10.1016/j.quascirev.2018.10.022
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	202
Page Range:	S. 154 - 166
Date:	2018
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STABLE-ISOTOPE; HYDROLOGICAL VARIABILITY; ENVIRONMENTAL VARIABILITY; GALICICA MOUNTAINS; TENAGHI PHILIPPON; OHRID MACEDONIA; POLLEN RECORDS; CLIMATE-CHANGE; 637 KA; MARINE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16195