Lacustrine sediments document millennial-scale climate variability in northern Greece prior to the onset of the northern hemisphere glaciation

Weber, ME; Tougiannidis, N; Kleineder, M; Bertram, N; Ricken, W; Rolf, C; Reinsch, T; Antoniadis, P

dc.contributor.author	Weber, ME	en
dc.contributor.author	Tougiannidis, N	en
dc.contributor.author	Kleineder, M	en
dc.contributor.author	Bertram, N	en
dc.contributor.author	Ricken, W	en
dc.contributor.author	Rolf, C	en
dc.contributor.author	Reinsch, T	en
dc.contributor.author	Antoniadis, P	en
dc.date.accessioned	2014-03-01T01:33:41Z
dc.date.available	2014-03-01T01:33:41Z
dc.date.issued	2010	en
dc.identifier.issn	0031-0182	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20534
dc.subject	Cyclic processes	en
dc.subject	Greece	en
dc.subject	Insolation	en
dc.subject	Millennial-scale climate	en
dc.subject	Non-destructive data sets	en
dc.subject	Orbital forcing	en
dc.subject	Paleomagnetics	en
dc.subject.classification	Geography, Physical	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Paleontology	en
dc.subject.other	biostratigraphy	en
dc.subject.other	chronology	en
dc.subject.other	climate variation	en
dc.subject.other	deep water	en
dc.subject.other	eccentricity	en
dc.subject.other	frequency analysis	en
dc.subject.other	glaciation	en
dc.subject.other	ice core	en
dc.subject.other	ice sheet	en
dc.subject.other	insolation	en
dc.subject.other	lacustrine deposit	en
dc.subject.other	lava	en
dc.subject.other	Neogene	en
dc.subject.other	Northern Hemisphere	en
dc.subject.other	orbital forcing	en
dc.subject.other	paleoenvironment	en
dc.subject.other	paleomagnetism	en
dc.subject.other	resolution	en
dc.subject.other	salinity	en
dc.subject.other	sedimentation	en
dc.subject.other	spectral analysis	en
dc.subject.other	Arctic	en
dc.subject.other	Atlantic Ocean	en
dc.subject.other	Atlantic Ocean (North)	en
dc.subject.other	Greece	en
dc.subject.other	Greenland	en
dc.subject.other	Ptolemais Basin	en
dc.subject.other	Western Macedonia	en
dc.subject.other	Zanclea	en
dc.title	Lacustrine sediments document millennial-scale climate variability in northern Greece prior to the onset of the northern hemisphere glaciation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.palaeo.2010.03.007	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.palaeo.2010.03.007	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	We investigated two lignite quarries in northern Greece for orbital and suborbital climate variability. Sections Lava and Vegora are located at the southern and northern boundaries of the Ptolemais Basin, a northwest southeast elongated intramontane basin that contains Upper Miocene to Lower Pliocene lacustrine sediments. Sediments show cyclic alterations of marl-rich (light), and coal-rich or clay-rich (dark) strata on a decimeter to meter scale. First, we established low-resolution ground-truth stratigraphy based on paleomagnetics and biostratigraphy. Accordingly, the lower 67 m and 65 m that were investigated in both sections Vegora and Lava, respectively, belong to the Upper Miocene and cover a time period of 6.85 to 6.57 and 6.46 to 5.98 Ma at sedimentation rates of roughly 14 and 22 cm/ka. In order to obtain a robust and high-resolution chronology, we then tuned carbonate minima (low L* values; high magnetic susceptibility values) to insolation minima. Besides the known dominance of orbital precession and eccentricity, we detected a robust hemi-precessional cycle in most parameters, most likely indicative for monsoonal influence on climate. Moreover, the insolation-forced time series indicate a number of millennial-scale frequencies that are statistically significant with dominant periods of 1.5-8 kyr. Evolutionary spectral analysis indicates that millennial-scale climate variability documented for the Ptolemais Basin resembles the one that is preserved in ice-core records of Greenland. Most cycles show durations of several tens of thousands of years before they diminish or cease. This is surprising because the generally argued cause for Late Quaternary millennial-scale variability is associated with the presence of large ice sheets, which cannot be the case for the Upper Miocene. Possible explanations maybe a direct response to solar forcing, an influence on the formation of North Atlantic Deep Water through the outflow of high-salinity water, or an atmospheric link to the North Atlantic Oscillation. (C) 2010 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Palaeogeography, Palaeoclimatology, Palaeoecology	en
dc.identifier.doi	10.1016/j.palaeo.2010.03.007	en
dc.identifier.isi	ISI:000278782400016	en
dc.identifier.volume	291	en
dc.identifier.issue	3-4	en
dc.identifier.spage	360	en
dc.identifier.epage	370	en