Early to mid‐Holocene climate change at Lago dell'Accesa (central Italy): climate signal or anthropogenic bias?

Finsinger, Walter; Colombaroli, Danièle; Beaulieu, J.‐L. de; Valsecchi, Verushka; Vannière, Boris; Vescovi, Elisa; Chapron, Emmanuel; Lotter, André F.; Magny, Michel; Tinner, Willy

doi:10.1002/jqs.1402

Cited by 48 publications

(43 citation statements)

References 59 publications

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“…A cold oscillation has also been observed for the Preboreal chronozone in the pollen stratigraphy of Lago di Avigliana . A cooling and drought event is also evidenced in pollen and lake level records from Lago di Accesa (Magny et al, 2006a;Finsinger et al, 2010) and linked with the PBO. Magny et al (2007) provided a lake level synthesis for the PBO (ca.…”

Section: Fagus Developmentmentioning

confidence: 83%

Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy)

et al. 2013

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Adding to the on-going debate regarding vegetation recolonisation (more particularly the timing) in Europe and climate change since the Lateglacial, this study investigates a long sediment core (LL081) from Lake Ledro (652 m a.s.l., southern Alps, Italy). Environmental changes were reconstructed using multiproxy analysis (pollen-based vegetation and climate reconstruction, lake levels, magnetic susceptibility and X-ray fluorescence (XRF) measurements) recorded climate and land-use changes during the Lateglacial and early–middle Holocene. The well-dated and high-resolution pollen record of Lake Ledro is compared with vegetation records from the southern and northern Alps to trace the history of tree species distribution. An altitude-dependent progressive time delay of the first continuous occurrence of Abies (fir) and of the Larix (larch) development has been observed since the Lateglacial in the southern Alps. This pattern suggests that the mid-altitude Lake Ledro area was not a refuge and that trees originated from lowlands or hilly areas (e.g. Euganean Hills) in northern Italy. Preboreal oscillations (ca. 11 000 cal BP), Boreal oscillations (ca. 10 200, 9300 cal BP) and the 8.2 kyr cold event suggest a centennial-scale climate forcing in the studied area. Picea (spruce) expansion occurred preferentially around 10 200 and 8200 cal BP in the south-eastern Alps, and therefore reflects the long-lasting cumulative effects of successive boreal and the 8.2 kyr cold event. The extension of Abies is contemporaneous with the 8.2 kyr event, but its development in the southern Alps benefits from the wettest interval 8200–7300 cal BP evidenced in high lake levels, flood activity and pollen-based climate reconstructions. Since ca. 7500 cal BP, a weak signal of pollen-based anthropogenic activities suggest weak human impact. The period between ca. 5700 and ca. 4100 cal BP is considered as a transition period to colder and wetter conditions (particularly during summers) that favoured a dense beech (Fagus) forest development which in return caused a distinctive yew (Taxus) decline. We conclude that climate was the dominant factor controlling vegetation changes and erosion processes during the early and middle Holocene (up to ca. 4100 cal BP)

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Section: Fagus Developmentmentioning

confidence: 83%

Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy)

et al. 2013

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“…: Magny et al, 2007;Drescher-Schneider et al, 2007;Vannière et al, 2008; Peyron et al, 2011;Finsinger et al, 2010 (Ozenda, 1979 A core transect was carried out from the western shore of Lake Accesa . Pollen data for the current study were extracted from two overlapping cores, AC3 and AC4 (AC3/4), obtained in a littoral mire, 50 m from the present-day lake shore.…”

Section: Lake Accesa (Tuscany Central Italy)mentioning

confidence: 99%

“…4300 cal yr BP (early Bronze Age). More details on Lake Accesa pollen, lake levels and climate history can be found in Drescher-Schneider et al (2007), Colombaroli et al (2008), Magny et al (2007), Vannière et al (2011), Finsinger et al (2010, Sadori et al (2011) and Peyron et al (2011).…”

Section: Lake Accesa (Tuscany Central Italy)mentioning

confidence: 99%

“…(b) Pollen-inferred temperature of the warmest month for (1, pink curve) Lake Accesa littoral core, MAT only (as for Fig. 3), and (2, purple curve) Lake Accesa profundal core, WAPLS only (Finsinger et al, 2010). (c) Pollen-inferred temperature of the warmest month for Tenaghi Philippon, Greece, MAT only .…”

Section: A North-south Climatic Pattern? Looking At the Precipitationmentioning

confidence: 99%

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Contrasting patterns of climatic changes during the Holocene across the Italian Peninsula reconstructed from pollen data

et al. 2013

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Lake-level records from Italy suggest that patterns of precipitation in the central Mediterranean during the Holocene were divided between the north and south, but a scarcity of reliable palaeoclimatic records in the north and central-southern Mediterranean means new evidence is needed to validate this hypothesis. We provide robust quantitative estimates of Holocene climate in the Mediterranean region using four high-resolution pollen records from northern (Lakes Ledro and Accesa) and southern (Lakes Trifoglietti and Pergusa) Italy. Multiple methods are used to provide an improved assessment of the palaeoclimatic reconstruction uncertainty. The multi-method approach uses the pollenbased weighted averaging, weighted-average partial leastsquares regression, modern analogue technique, and the nonmetric multidimensional scaling/generalized additive model methods. We use independent lake-level data to validate the precipitation reconstructions. Our results support a climatic partition between northern and southern Italy during the Holocene, confirming the hypothesis of opposing mid-Holocene summer precipitation regimes in the Mediterranean. The northern sites (Ledro, Accesa) are characterized by minima for summer precipitation and lake levels during the early to midHolocene, while the southern sites (Trifoglietti, Pergusa) are marked by maxima for precipitation and lake levels at the same time. Both pollen-inferred precipitation and lake levels indicate the opposite pattern during the late Holocene, a maximum in northern Italy and a minimum in southern Italy/Sicily. Summer temperatures show the same partitioning, with warm conditions in northern Italy and cool conditions in Sicily during the early/mid-Holocene, and a reversal during the late Holocene. Comparison with marine cores from the Aegean Sea suggests that climate trends and gradients observed in Italy show strong similarities with those recognized from the Aegean Sea, and more generally speaking in the eastern Mediterranean

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“…The MAT has been used in a number of studies focusing Mediterranean regions (e.g. Desprat et al, 2013;Peyron et al, 2011Peyron et al, , 2013Pross et al, 2009) and the WAPLS has recently been successfully tested in Mediterranean regions (Finsinger et al, 2010;Peyron et al, 2013), showing its reliability in linking modern pollen data to climate in the Italian area (Finsinger et al, 2007). More details on these two methods are given in Peyron et al (2013).…”

Section: Climate Reconstructionmentioning

confidence: 99%

The last 7 millennia of vegetation and climate changes at Lago di Pergusa (central Sicily, Italy)

et al. 2013

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The aim of this study is to investigate climate changes and human activities under the lens of palynology. Based on a new high-resolution pollen sequence (PG2) from Lago di Pergusa (667 m a.s.l., central Sicily, Italy) covering the last 6700 yr, we propose a reconstruction of climate and landscape changes over the recent past in central Sicily. Compared to former studies from Lago di Pergusa (Sadori and Narcisi, 2001), this work provides a reconstruction of the evolution of vegetation and climate over the last millennia in central Sicily, indeed completing previous results with new pollen data, which is particularly detailed on the last 3000 yr.

Joint actions of increasing dryness, climate oscillations, and human impact shaped the landscape of this privileged site. Lago di Pergusa, besides being the main inland lake of Sicily, is very sensitive to climate change and its territory was inhabited and exploited continuously since the Palaeolithic. The lake sediments turned out to be a good observatory for natural phenomena that occurred in the last thousands of years.

Results of the pollen-based study are integrated with changes in magnetic susceptibility and a tephra layer characterization. The tephra layer was shown to be related to the Sicanians' event, radiocarbon dated at 3055 ± 75 yr BP (Sadori and Narcisi, 2001).

We performed palaeoclimate reconstructions by MAT (Modern Analogues Technique) and WAPLS (Weighted Average Partial Least Square). Palaeoclimate reconstructions based on the core show important climate fluctuations throughout the Holocene. Climate reconstruction points out four phases of cooling and enhanced wetness in the last three millennia (2600-2000, 1650-1100, 850-550, 400-200 cal BP, corresponding to the periods between 650-50 BC, and 300-850, 1100-1400, 1550-1750 AD, respectively)

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Early to mid‐Holocene climate change at Lago dell'Accesa (central Italy): climate signal or anthropogenic bias?

Cited by 48 publications

References 59 publications

Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy)

Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy)

Contrasting patterns of climatic changes during the Holocene across the Italian Peninsula reconstructed from pollen data

The last 7 millennia of vegetation and climate changes at Lago di Pergusa (central Sicily, Italy)

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