Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea

Siani, Giuseppe; Magny, Michel; Paterne, Martine; Debret, Maxime; Fontugne, Michel

doi:10.5194/cp-9-499-2013

Cited by 74 publications

(56 citation statements)

References 114 publications

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“…It has been shown that the most productive months of G. bulloides in the Mediterranean Sea are April-May (Pujol and Vergnaud Grazzini, 1995). A complete description of δ 18 O measurements can be found in Siani et al (2013) for core MD90-917 and in Essalami et al (2007) for core MD04-2797.…”

Section: Oxygen Isotopesmentioning

confidence: 99%

Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

et al. 2013

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Sea surface temperatures (SSTs) were reconstructed over the last 25 000 yr using alkenone paleothermometry and planktonic foraminifera assemblages from two cores of the central Mediterranean Sea: the MD04-2797 core (Siculo–Tunisian channel) and the MD90-917 core (South Adriatic Sea). Comparison of the centennial scale structure of the two temperature signals during the last deglaciation period reveals significant differences in timing and amplitude. We suggest that seasonal changes likely account for seemingly proxy record divergences during abrupt transitions from glacial to interglacial climates and for the apparent short duration of the Younger Dryas (YD) depicted by the alkenone time series, a feature that has already been stressed in earlier studies on the Mediterranean deglaciation

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Section: Oxygen Isotopesmentioning

confidence: 99%

Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

et al. 2013

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“…7f) suggests that the African lakes were more affected by the climatic oscillation around 7500 cal BP than the Mediterranean ones, while they show nearly synchronous rises in water table around 10 500 cal BP. In the northern Mediterranean (Lake Accesa) and in west-central Europe (Lake Cerin), the period around 7500 cal BP coincided with the beginning of a trend toward higher lake-level conditions, while marine core MD90-917 in the southern Adriatic Sea shows a marked decline in salinity around 7500-7000 cal BP probably due to increased discharge from the Po River in northern Italy Siani et al, 2013).…”

Section: Climmentioning

confidence: 99%

“…In core MD90-917, Siani et al (2010Siani et al ( , 2013 have identified several tephras of interest for correlation between tephro-and climato-stratigraphies (Fig. 5).…”

Section: Climato-and Tephro-stratigraphiesmentioning

confidence: 99%

North–south palaeohydrological contrasts in the central Mediterranean during the Holocene: tentative synthesis and working hypotheses

et al. 2013

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Abstract. On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north–south transect, data collected in the central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and temporal coherency. Contrasting patterns of palaeohydrological changes have been evidenced in the central Mediterranean: south (north) of around 40° N of latitude, the middle part of the Holocene was characterised by lake-level maxima (minima), during an interval dated to ca. 10 300–4500 cal BP to the south and 9000–4500 cal BP to the north. Available data suggest that these contrasting palaeohydrological patterns operated throughout the Holocene, both on millennial and centennial scales. Regarding precipitation seasonality, maximum humidity in the central Mediterranean during the middle part of the Holocene was characterised by humid winters and dry summers north of ca. 40° N, and humid winters and summers south of ca. 40° N. This may explain an apparent conflict between palaeoclimatic records depending on the proxies used for reconstruction as well as the synchronous expansion of tree species taxa with contrasting climatic requirements. In addition, south of ca. 40° N, the first millennium of the Holocene was characterised by very dry climatic conditions not only in the eastern, but also in the central- and the western Mediterranean zones as reflected by low lake levels and delayed reforestation. These results suggest that, in addition to the influence of the Nile discharge reinforced by the African monsoon, the deposition of Sapropel 1 has been favoured (1) by an increase in winter precipitation in the northern Mediterranean borderlands, and (2) by an increase in winter and summer precipitation in the southern Mediterranean area. The climate reversal following the Holocene climate optimum appears to have been punctuated by two major climate changes around 7500 and 4500 cal BP. In the central Mediterranean, the Holocene palaeohydrological changes developed in response to a combination of orbital, ice-sheet and solar forcing factors. The maximum humidity interval in the south-central Mediterranean started ca. 10 300 cal BP, in correlation with the decline (1) of the possible blocking effects of the North Atlantic anticyclone linked to maximum insolation, and/or (2) of the influence of the remnant ice sheets and fresh water forcing in the North Atlantic Ocean. In the north-central Mediterranean, the lake-level minimum interval began only around 9000 cal BP when the Fennoscandian ice sheet disappeared and a prevailing positive NAO-(North Atlantic Oscillation) type circulation developed in the North Atlantic area. The major palaeohydrological oscillation around 4500–4000 cal BP may be a non-linear response to the gradual decrease in insolation, with additional key seasonal and interhemispheric changes. On a centennial scale, the successive climatic events which punctuated the entire Holocene in the central Mediterranean coincided with cooling events associated with deglacial outbursts in the North Atlantic area and decreases in solar activity during the interval 11 700–7000 cal BP, and to a possible combination of NAO-type circulation and solar forcing since ca. 7000 cal BP onwards. Thus, regarding the centennial-scale climatic oscillations, the Mediterranean Basin appears to have been strongly linked to the North Atlantic area and affected by solar activity over the entire Holocene. In addition to model experiments, a better understanding of forcing factors and past atmospheric circulation patterns behind the Holocene palaeohydrological changes in the Mediterranean area will require further investigation to establish additional high-resolution and well-dated records in selected locations around the Mediterranean Basin and in adjacent regions. Special attention should be paid to greater precision in the reconstruction, on millennial and centennial timescales, of changes in the latitudinal location of the limit between the northern and southern palaeohydrological Mediterranean sectors, depending on (1) the intensity and/or characteristics of climatic periods/oscillations (e.g. Holocene thermal maximum versus Neoglacial, as well as, for instance, the 8.2 ka event versus the 4 ka event or the Little Ice Age); and (2) on varying geographical conditions from the western to the eastern Mediterranean areas (longitudinal gradients). Finally, on the basis of projects using strategically located study sites, there is a need to explore possible influences of other general atmospheric circulation patterns than NAO, such as the East Atlantic–West Russian or North Sea–Caspian patterns, in explaining the apparent complexity of palaeoclimatic (palaeohydrological) Holocene records from the Mediterranean area.

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“…The initial reduction in 14 C dates coincides with a significant decline in sea surface temperatures (SST) in the southern Adriatic between 7800 and 7500 cal BP. This was followed by a more pronounced SST cooling between 7300 and 6300 cal BP, which at its nadir was characterized by SSTs lower than those registered during the 8.2 ka event (Siani et al 2013). …”

Section: Discussionmentioning

confidence: 99%

“…Cumulative calibrated dating probability of radiocarbon data (terrestrial series) from Mesolithic and Early Neolithic sites along the Danube main channel in the Iron Gates, compared to climate proxy records from the North Atlantic and Europe 10,000-6000 cal BP. A -after Bond et al (1997); B, D, F, G -smoothed records redrawn from Rohling and Pälike (2005); E -after Siani et al (2013); C -horizontal bars represent cold phases recorded in δ 18 O records from V11 Cave, NW Romania (Tămaș et al, 2005) and Katerloch Cave, Austria (Boch et al, 2009); vertical grey bars represent higher lake-level events in the Alps-Jura region (Magny, 2004). (Wurth et al, 2004); 2 -Katerloch Cave (Boch et al, 2009); 3 -V11 Cave (Tămaș et al, 2007); 4 -Lake Ammersee (von Grafenstein et al, 1998(von Grafenstein et al, , 1999; 5 -Lake Schleinsee (Tinner and Lotter, 2001); 6 -Lake Soppensee (Tinner and Lotter, 2001); 7 -Brunnboden and Krummgampen peat bogs (Kofler et al, 2005); 8 -Preluca Tiganului and Steregoiu peat bogs (Feurdean, 2005); 9 -Alps-Jura lakes study region (Magny, 2004); 10 -Teleorman Valley (Macklin et al, 2011); 11 -Durance Valley (Miramont et al, 2001); 12 -Middle Rhône Valley (Berger et al, 2002).…”

Section: Fig 1 Mesolithic and Early Neolithic Sites In The Ironmentioning

confidence: 99%

Holocene climate change and prehistoric settlement in the lower Danube valley

Macklin

Boroneanț²,

Pickard

et al. 2015

Quaternary International

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An analysis of the summed probability distributions of 293 radiocarbon dates from Late Glacial to mid-Holocene sites in the Danubian Iron Gates highlights the existence of well-marked 14 C discontinuities at c. 9.5-9.0 ka, 8.65-8.0 ka and after 7.8 ka cal BP. These coincide with climate anomalies recorded in Greenland ice cores and palaeoclimate archives from the Danube catchment. Four possible explanations are considered: dwindling fish resources, changes in the social environment, floodinduced settlement relocations, and taphonomic effects. On present evidence, the last two factors are thought to be the most likely cause of the discontinuities observed in the Iron Gates Mesolithic-Early Neolithic radiocarbon record.

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Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea

Cited by 74 publications

References 114 publications

Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

North–south palaeohydrological contrasts in the central Mediterranean during the Holocene: tentative synthesis and working hypotheses

Holocene climate change and prehistoric settlement in the lower Danube valley

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