Universität zu Köln

Francke, Alexander ORCID: 0000-0002-0370-5802, Wagner, Bernd ORCID: 0000-0002-1369-7893, Just, Janna ORCID: 0000-0002-5257-604X, Leicher, Niklas ORCID: 0000-0002-3367-5982, Gromig, Raphael, Baumgarten, Henrike, Vogel, Hendrik ORCID: 0000-0002-9902-8120, Lacey, Jack H. ORCID: 0000-0002-6329-2149, Sadori, Laura ORCID: 0000-0002-2774-6705, Wonik, Thomas, Leng, Melanie J., Zanchetta, Giovanni, Sulpizio, Roberto ORCID: 0000-0002-3930-5421 and Giaccio, Biagio ORCID: 0000-0002-7007-9127 (2016). Sedimentological processes and environmental variability at Lake Ohrid (Macedonia, Albania) between 637 ka and the present. Biogeosciences, 13 (4). S. 1179 - 1197. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1726-4189

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Abstract

Lake Ohrid (Macedonia, Albania) is thought to be more than 1.2 million years old and host more than 300 endemic species. As a target of the International Continental scientific Drilling Program (ICDP), a successful deep drilling campaign was carried out within the scope of the Scientific Collaboration on Past Speciation Conditions in Lake Ohrid (SCOPSCO) project in 2013. Here, we present lithological, sedimentological, and (bio-) geochemical data from the upper 247.8m composite depth of the overall 569m long DEEP site sediment succession from the central part of the lake. According to an age model, which is based on 11 tephra layers (first-order tie points) and on tuning of bio-geochemical proxy data to orbital parameters (second-order tie points), the analyzed sediment sequence covers the last 637 kyr. The DEEP site sediment succession consists of hemipelagic sediments, which are interspersed by several tephra layers and infrequent, thin (< 5 cm) mass wasting deposits. The hemipelagic sediments can be classified into three different lithotypes. Lithotype 1 and 2 deposits comprise calcareous and slightly calcareous silty clay and are predominantly attributed to interglacial periods with high primary productivity in the lake during summer and reduced mixing during winter. The data suggest that high ion and nutrient concentrations in the lake water promoted calcite precipitation and diatom growth in the epilimnion during MIS15, 13, and 5. Following a strong primary productivity, highest interglacial temperatures can be reported for marine isotope stages (MIS) 11 and 5, whereas MIS15, 13, 9, and 7 were comparably cooler. Lithotype 3 deposits consist of clastic, silty clayey material and predominantly represent glacial periods with low primary productivity during summer and longer and intensified mixing during winter. The data imply that the most severe glacial conditions at Lake Ohrid persisted during MIS16, 12, 10, and 6, whereas somewhat warmer temperatures can be inferred for MIS14, 8, 4, and 2. Interglacial-like conditions occurred during parts of MIS14 and 8.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Francke, Alexander UNSPECIFIED orcid.org/0000-0002-0370-5802 UNSPECIFIED Wagner, Bernd UNSPECIFIED orcid.org/0000-0002-1369-7893 UNSPECIFIED Just, Janna UNSPECIFIED orcid.org/0000-0002-5257-604X UNSPECIFIED Leicher, Niklas UNSPECIFIED orcid.org/0000-0002-3367-5982 UNSPECIFIED Gromig, Raphael UNSPECIFIED UNSPECIFIED UNSPECIFIED Baumgarten, Henrike UNSPECIFIED UNSPECIFIED UNSPECIFIED Vogel, Hendrik UNSPECIFIED orcid.org/0000-0002-9902-8120 UNSPECIFIED Lacey, Jack H. UNSPECIFIED orcid.org/0000-0002-6329-2149 UNSPECIFIED Sadori, Laura UNSPECIFIED orcid.org/0000-0002-2774-6705 UNSPECIFIED Wonik, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Leng, Melanie J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zanchetta, Giovanni UNSPECIFIED UNSPECIFIED UNSPECIFIED Sulpizio, Roberto UNSPECIFIED orcid.org/0000-0002-3930-5421 UNSPECIFIED Giaccio, Biagio UNSPECIFIED orcid.org/0000-0002-7007-9127 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-292328
DOI:	10.5194/bg-13-1179-2016
Journal or Publication Title:	Biogeosciences
Volume:	13
Number:	4
Page Range:	S. 1179 - 1197
Date:	2016
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1726-4189
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TENAGHI-PHILIPPON; CLIMATE VARIABILITY; ORGANIC-MATTER; RECORD; VEGETATION; EVOLUTION; SEDIMENTS; HISTORY; PRESPA; ELGYGYTGYN Multiple languages Ecology; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/29232