Universität zu Köln

Francke, Alexander ORCID: 0000-0002-0370-5802, Lacey, Jack H. ORCID: 0000-0002-6329-2149, Marchegiano, Marta, Wagner, Bernd, Ariztegui, Daniel ORCID: 0000-0001-7775-5127, Zanchetta, Giovanni ORCID: 0000-0002-7080-9599, Kusch, Stephanie ORCID: 0000-0002-2708-4975, Ufer, Kristian, Baneschi, Ilaria and Knodgen, Katharina (2022). Last Glacial central Mediterranean hydrology inferred from Lake Trasimeno's (Italy) calcium carbonate geochemistry. Boreas, 51 (1). S. 219 - 238. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

There is still a paucity of hydrological data explaining the relationship between (rapid, millennial-scale) climate forcing and Mediterranean rainfall since the Last Glacial. We show that distinct lake-level fluctuations at Lake Trasimeno (Italy) are associated with changing aridity in the central Mediterranean during the last similar to 47 800 years. The lake-level fluctuations are reconstructed based on carbonate mineral content and carbonate mineral species, as well as the stable oxygen and carbon isotope (delta O-18 and delta C-13) geochemistry of endogenic carbonates. Low lake levels are linked to high carbonate, Mg-calcite and aragonite contents, and high delta O-18 and delta C-13 values. Inferred hydrological changes are linked to glacial-interglacial and, tentatively within the limitations of our chronology, to millennial-scale climate variability as well as the intensity of the Atlantic Meridional Overturning Circulation (AMOC). Prior to the Last Glacial Maximum (LGM), during intervals equivalent to Marine Isotope Stage 3 (MIS 3), a stronger AMOC associated with Greenland interstadial periods (Dansgaard/Oeschger (D/O) warm periods) and stronger Asian monsoon probably coincide with increased precipitation in central Italy as inferred from high lake levels at Lake Trasimeno. Periods of weak AMOC intensity such as during Greenland stadials (D/O cold periods), during Heinrich events, and weak Asian monsoons are correlated with lake level lowstands, which imply relatively dry conditions in central Italy. Lake Trasimeno's water level during the LGM and the Lateglacial (MIS 2) is relatively stable, with recorded changes showing distinct similarities to orbital configurations. Although muted, high latitude climate forcing is still evident in the data during peak glacial conditions. The transition from D/O-like hydrological variability at Lake Trasimeno during MIS 3 to orbitally controlled fluctuations during the Lateglacial to Holocene transition coincides with an increasing amplitude in local winter and summer insolation, probably indicating increasing seasonality and a larger temperature gradient between low- and high-latitude settings.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Francke, Alexander UNSPECIFIED orcid.org/0000-0002-0370-5802 UNSPECIFIED Lacey, Jack H. UNSPECIFIED orcid.org/0000-0002-6329-2149 UNSPECIFIED Marchegiano, Marta UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED Ariztegui, Daniel UNSPECIFIED orcid.org/0000-0001-7775-5127 UNSPECIFIED Zanchetta, Giovanni UNSPECIFIED orcid.org/0000-0002-7080-9599 UNSPECIFIED Kusch, Stephanie UNSPECIFIED orcid.org/0000-0002-2708-4975 UNSPECIFIED Ufer, Kristian UNSPECIFIED UNSPECIFIED UNSPECIFIED Baneschi, Ilaria UNSPECIFIED UNSPECIFIED UNSPECIFIED Knodgen, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598771
DOI:	10.1111/bor.12552
Journal or Publication Title:	Boreas
Volume:	51
Number:	1
Page Range:	S. 219 - 238
Date:	2022
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MILLENNIAL-SCALE VARIABILITY; CLIMATE VARIABILITY; DANSGAARD-OESCHGER; STABLE-ISOTOPES; TEPHROSTRATIGRAPHIC RECORD; ENVIRONMENTAL-CHANGE; ORGANIC-MATTER; NORTH-ATLANTIC; VEGETATION; HOLOCENE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59877