Universität zu Köln

Lacey, Jack H. ORCID: 0000-0002-6329-2149, Leng, Melanie J., Francke, Alexander ORCID: 0000-0002-0370-5802, Sloane, Hilary J., Milodowski, Antoni, Vogel, Hendrik ORCID: 0000-0002-9902-8120, Baumgarten, Henrike, Zanchetta, Giovanni ORCID: 0000-0002-7080-9599 and Wagner, Bernd ORCID: 0000-0002-1369-7893 (2016). Northern Mediterranean climate since the Middle Pleistocene: a 637 ka stable isotope record from Lake Ohrid (Albania/Macedonia). Biogeosciences, 13 (6). S. 1801 - 1821. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1726-4189

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Abstract

Lake Ohrid (Macedonia/Albania) is an ancient lake with unique biodiversity and a site of global significance for investigating the influence of climate, geological, and tectonic events on the generation of endemic populations. Here, we present oxygen (delta O-18) and carbon (delta O-13) isotope data from carbonate over the upper 243 m of a composite core profile recovered as part of the Scientific Collaboration on Past Speciation Conditions in Lake Ohrid (SCOP-SCO) project. The investigated sediment succession covers the past ca. 637 ka. Previous studies on short cores from the lake (up to 15 m, < 140 ka) have indicated the total inorganic carbon (TIC) content of sediments to be highly sensitive to climate change over the last glacial-interglacial cycle. Sediments corresponding to warmer periods contain abundant endogenic calcite; however, an overall low TIC content in glacial sediments is punctuated by discrete bands of early diagenetic authigenic siderite. Isotope measurements on endogenic calcite (delta O-18(c) and delta C-13(c) ) reveal variations both between and within interglacials that suggest the lake has been subject to palaeoenvironmental change on orbital and millennial timescales. We also measured isotope ratios from authigenic siderite (delta O-18(s) and delta C-13(s)) and, with the oxygen isotope composition of calcite and siderite, reconstruct delta O-18 of lake water (delta O-18(lw)) over the last 637 ka. Interglacials have higher delta O-18(lw) values when compared to glacial periods most likely due to changes in evaporation, summer temperature, the proportion of winter precipitation (snowfall), and inflow from adjacent Lake Prespa. The isotope stratigraphy suggests Lake Ohrid experienced a period of general stability from marine isotope stage (MIS) 15 to MIS 13, highlighting MIS 14 as a particularly warm glacial. Climate conditions became progressively wetter during MIS 11 and MIS 9. Interglacial periods after MIS 9 are characterised by increasingly evaporated and drier conditions through MIS 7, MIS 5, and the Holocene. Our results provide new evidence for long-term climate change in the northern Mediterranean region, which will form the basis to better understand the influence of major environmental events on biological evolution within Lake Ohrid.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lacey, Jack H. UNSPECIFIED orcid.org/0000-0002-6329-2149 UNSPECIFIED Leng, Melanie J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Francke, Alexander UNSPECIFIED orcid.org/0000-0002-0370-5802 UNSPECIFIED Sloane, Hilary J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Milodowski, Antoni UNSPECIFIED UNSPECIFIED UNSPECIFIED Vogel, Hendrik UNSPECIFIED orcid.org/0000-0002-9902-8120 UNSPECIFIED Baumgarten, Henrike UNSPECIFIED UNSPECIFIED UNSPECIFIED Zanchetta, Giovanni UNSPECIFIED orcid.org/0000-0002-7080-9599 UNSPECIFIED Wagner, Bernd UNSPECIFIED orcid.org/0000-0002-1369-7893 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-292343
DOI:	10.5194/bg-13-1801-2016
Journal or Publication Title:	Biogeosciences
Volume:	13
Number:	6
Page Range:	S. 1801 - 1821
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 HIGH-RESOLUTION POLLEN; ENVIRONMENTAL-CHANGE; EASTERN ANATOLIA; HYDROLOGICAL VARIABILITY; HOLOCENE CLIMATE; SOUTHERN EUROPE; GLACIAL MAXIMUM; CARBON-DIOXIDE; SOREQ CAVE; LAST Multiple languages Ecology; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/29234