Holocene climate changes in the central Mediterranean as recorded by lake-level fluctuations at Lake Accesa (Tuscany, Italy)

Magny, Michel; Beaulieu, Jacques‐Louis de; Drescher-Schneider, Ruth; Vannière, Boris; Walter-Simonnet, Anne-Véronique; Miras, Yannick; Millet, Laurent; Bossuet, Gilles; Peyron, Odile; Brugiapaglia, Elisabetta; Leroux, Aurélie

doi:10.1016/j.quascirev.2007.04.014

Cited by 248 publications

(317 citation statements)

References 45 publications

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“…Thus, the 7500-7000 cal yr BP event may have been driven by a combination of orbital forcing and change in solar activity. Finally, the rise event dated to 5850-5300 cal yr BP at Lake Ledro coincided (Magny et al, 2011a), Lake Ledro (this study), Lake Accesa (Magny et al, 2007), Lago Preola (Magny et al, 2011b), Soreq cave (Bar-Matthews et al, 1998) and Lake Yoa (Kröpelin et al, 2008). Note the opposite palaeohydrological signals provided by sites north and south of latitude ca.…”

Section: Discussionsupporting

confidence: 52%

“…Finally, the strong development of Abies coincided with the rise event dated to 7300-7100 cal yr BP. This major event is also observed at Lake Accesa where it marks the end of the lake-level minimum dated to 9200-7700 cal yr BP (Magny et al, 2007). In marine core MD90-917 in the Adriatic Sea, Siani et al (2010) have shown that the Holocene SST record was punctuated by two major negative anomalies at 8200 and around 7000 cal yr BP.…”

Section: Discussionmentioning

confidence: 65%

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Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of lake ledro, northeastern Italy

et al. 2012

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A lake-level record of Lake Ledro (northern Italy) spans the entire Holocene with a chronology derived from 51 radiocarbon dates. It is based on a specific sedimentological approach that combines data from five sediment profiles sampled in distinct locations in the littoral zone. On a millennial scale, the lake-level record shows two successive periods from 11,700 to 4500 cal yr BP and from 4500 cal yr BP to the present, characterized by lower and higher average lake levels, respectively. In addition to key seasonal and inter-hemispherical changes in insolation, the major hydrological change around 4500 cal yr BP may be related to a non-linear response of the climate system to orbitally-driven gradual decrease in insolation. The Ledro record questions the notion of an accentuated summer rain regime in the northern Mediterranean borderlands during the boreal insolation maximum. Moreover, the Ledro record highlights that the Holocene was punctuated by successive centennial-scale highstands. Correlations with the Preboreal oscillation and the 8.2 ka event, and comparison with the atmospheric 14 C residual record, suggest that short-lived lake-level fluctuations developed at Ledro in response to (1) final steps of the deglaciation in the North Atlantic area and (2) variations in solar activity.

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Section: Discussionsupporting

confidence: 52%

Section: Discussionmentioning

confidence: 65%

Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of lake ledro, northeastern Italy

et al. 2012

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“…It is interesting also to note that major Holocene highstands detected in the Lake Accesa record (Tuscany, Northern central Italy) at 11. 5, 11.1, 10.2, 9.4, 8.2 and 7.3 cal ka BP (Magny et al, 2007b) correspond to dry intervals in the Alboran borderlands. In this respect, as Magny et al (2007b) indicate, the record of Lake Accesa highstands conforms to the central-Western European pattern.…”

Section: Regional Patterns and A Proposed Atmospheric Mechanismmentioning

confidence: 98%

“…5, 11.1, 10.2, 9.4, 8.2 and 7.3 cal ka BP (Magny et al, 2007b) correspond to dry intervals in the Alboran borderlands. In this respect, as Magny et al (2007b) indicate, the record of Lake Accesa highstands conforms to the central-Western European pattern. Our findings therefore indicate not only an opposed hydrological pattern between the Western Mediterranean and central Europe, but also between the Western Mediterranean and Northern central Italy, highlighting important spatial variability in climatic patterns across the western and central sectors of the Mediterranean basin.…”

Section: Regional Patterns and A Proposed Atmospheric Mechanismmentioning

confidence: 98%

Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record

et al. 2010

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Abstract. Abrupt changes in Western Mediterranean climate during the last deglaciation (20 to 6 cal ka BP) are detected in marine core MD95-2043 (Alboran Sea) through the investigation of high-resolution pollen data and pollenbased climate reconstructions by the modern analogue technique (MAT) for annual precipitation (P ann ) and mean temperatures of the coldest and warmest months (MTCO and MTWA). Changes in temperate Mediterranean forest development and composition and MAT reconstructions indicate major climatic shifts with parallel temperature and precipitation changes at the onsets of Heinrich stadial 1 (equivalent to the Oldest Dryas), the Bölling-Allerød (BA), and the Younger Dryas (YD). Multi-centennial-scale oscillations in forest development occurred throughout the BA, YD, and early Holocene. Shifts in vegetation composition and P ann reconstructions indicate that forest declines occurred during dry, and generally cool, episodes centred at 14.0, 13.3, 12.9, 11.8, 10.7, 10.1, 9.2, 8.3 and 7.4 cal ka BP. The forest record also suggests multiple, low-amplitude Preboreal (PB) climate oscillations, and a marked increase in moisture availability for forest development at the end of the PB at 10.6 cal ka BP. Dry atmospheric conditions in the Western Mediterranean occurred in phase with Lateglacial events of high-latitude cooling including GI-1d (Older Dryas), GI1b (Intra-Allerød Cold Period) and GS-1 (YD), and during Holocene events associated with high-latitude cooling, meltwater pulses and N. Atlantic ice-rafting. A possible climatic mechanism for the recurrence of dry intervals and an opposed regional precipitation pattern with respect to Westerncentral Europe relates to the dynamics of the westerlies and the prevalence of atmospheric blocking highs. ComparisonCorrespondence to: W. J. Fletcher (w.fletcher@em.uni-frankfurt.de) of radiocarbon and ice-core ages for well-defined climatic transitions in the forest record suggests possible enhancement of marine reservoir ages in the Alboran Sea by ∼200 years (surface water age ∼600 years) during the Lateglacial.

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“…As cores from the Mediterranean Sea and Atlantic Ocean show low sedimentation rates during the Holocene, the most detailed climate reconstructions are based on peat bog and lake records including, for example, those from Lake Accesa in northern Italy (Magny et al 2007), Lago Grande di Monticchio in southern Italy (Allen et al 2002), Capestang in southeastern France , Lake Le Bourget, northwestern Alps, France (Chapron et al 2005), Laguna de la Roya in northwestern Spain , Lago de Estanya in northeastern Spain (Morellón et al 2008), and Siles Lake in southern Spain (Carrión 2002). Some exceptions are marine records from Menorca, offshore from northeastern Spain (Frigola et al 2007), Biscaye in northwestern France (Naughton et al 2007), and the Alborán Sea, southern Spain (Fletcher and Sánchez Goñi 2008), where higher sedimentation rates have occurred due to their particular settings.…”

Section: Introductionmentioning

confidence: 99%

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

et al. 2009

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We present the Holocene sequence from Lago Enol (43°16′ N, 4°59′ W, 1070 m a.s.l.), Cantabrian Mountains, northern Spain. A multiproxy analysis provided comprehensive information about regional humidity and temperature changes. The analysis included sedimentological descriptions, physical properties, carbon and carbonate content, mineralogy and geochemical composition together with biological proxies including diatom and ostracod assemblages. A detailed pollen study enabled reconstruction of variations in vegetation cover, which were interpreted in the context of climate changes and human impact. Four distinct stages were recognized for the last 13,500 years: (i) a cold and dry episode that includes the Younger Dryas event (13,500−11,600 cal. yr BP);(ii) a humid and warmer period characterizing the onset of the Holocene (11,600−8700 1 cal. yr BP); (iii) a tendency toward a drier climate during the Middle Holocene (8700−4650 cal. yr BP); and (iv) a return to humid conditions following landscape modification by human activity (pastoral activities, deforestation) in the Late Holocene (4650−2200 cal. yr BP). Superimposed on relatively stable landscape conditions (e.g. maintenance of well established forests), the typical environmental variability of the southern European region is observed at this site.

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Holocene climate changes in the central Mediterranean as recorded by lake-level fluctuations at Lake Accesa (Tuscany, Italy)

Cited by 248 publications

References 45 publications

Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of lake ledro, northeastern Italy

Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of lake ledro, northeastern Italy

Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

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