Short-term climate changes during the Last Glacial-Holocene transition: comparison between Mediterranean records and the GRIP event stratigraphy

Asioli, Alessandra; Trincardi, Fabio; Lowe, John J.; Oldfield, Frank

doi:10.1002/(sici)1099-1417(199907)14:4<373::aid-jqs472>3.0.co;2-t

Cited by 69 publications

(77 citation statements)

References 13 publications

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“…Jalut et al (2009) reconstructed a similar pattern in the Western and Central Mediterranean with short dry summer periods since the beginning of the Holocene that correspond to presentday Mediterranean conditions. This pattern differs from results obtained for other geographical regions, for example in Northernmost Europe , and in the Eastern Mediterranean (Rossignol-Strick, 1999;Bar-Matthews et al, 2000) which found abundant year-round moisture with higher precipitation during the summer. However, such interpretation of wet summers in Eastern Mediterranean is still under debate (Tzedakis et al, 2007).…”

Section: Holocene Optimum (95 To 75 Kyr Bp)supporting

confidence: 57%

“…For each oscillations, the PSummer increase between 50 to 100 mm in the Aegean Sea and decrease between 25 to 50 mm in the Alboran Sea. These successive oscillations are well documented in Northern and Central Europe (Lotter et al, 1992;Magny et al, 2006a), and to a lesser extent, in the Mediterranean region (Asioli et al, 1999;Magny et al, 2006b;Drescher-Schneider et al, 2007).…”

Section: Bølling/allerød (147 To 125 Kyr Bp)mentioning

confidence: 99%

“…Previous studies have shown that annual precipitation reached a maximum during this period both in the eastern Mediterranean region (Bar-Matthews et al, 1999;Rossignol-Strick, 1999;Kotthoff et al, 2008a, b), and in northern Africa and central Europe (Magny et al, 2002). According to the results of our study, precipitation seasonality increased strongly during this period, with winter precipitation attaining a maximum at both sites (PWinter: 200 to 300 mm) and summer precipitation simultaneously reaching a minimum (PSummer: 50 to 100 mm).…”

Section: Holocene Optimum (95 To 75 Kyr Bp)mentioning

confidence: 99%

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Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records

et al. 2009

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Abstract. Pollen-based climate reconstructions were performed on two high-resolution pollen marines cores from the Alboran and Aegean Seas in order to unravel the climatic variability in the coastal settings of the Mediterranean region between 15 000 and 4000 years BP (the Lateglacial, and early to mid-Holocene). The quantitative climate reconstructions for the Alboran and Aegean Sea records focus mainly on the reconstruction of the seasonality changes (temperatures and precipitation), a crucial parameter in the Mediterranean region. This study is based on a multi-method approach comprising 3 methods: the Modern Analogues Technique (MAT), the recent Non-Metric Multidimensional Scaling/Generalized Additive Model method (NMDS/GAM) and Partial Least Squares regression (PLS). The climate signal inferred from this comparative approach confirms that cold and dry conditions prevailed in the Mediterranean region during the Oldest and Younger Dryas periods, while temperate conditions prevailed during the Bølling/Allerød and the Holocene. Our records suggest a West/East gradient of decreasing precipitation across the Mediterranean region during the cooler Late-glacial and early Holocene periods, similar to present-day conditions. Winter precipitation was highest during warm intervals and lowest during cooling phases. Several short-lived cool intervals (i.e. Older Dryas, another oscillation after this one (GI-1c2), Gerzensee/Preboreal Correspondence to: I. Dormoy (isabelle.dormoy@univ-fcomte.fr) Oscillations, 8.2 ka event, Bond events) connected to the North Atlantic climate system are documented in the Alboran and Aegean Sea records indicating that the climate oscillations associated with the successive steps of the deglaciation in the North Atlantic area occurred in both the western and eastern Mediterranean regions. This observation confirms the presence of strong climatic linkages between the North Atlantic and Mediterranean regions.

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Section: Holocene Optimum (95 To 75 Kyr Bp)supporting

confidence: 57%

Section: Bølling/allerød (147 To 125 Kyr Bp)mentioning

confidence: 99%

Section: Holocene Optimum (95 To 75 Kyr Bp)mentioning

confidence: 99%

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Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records

et al. 2009

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“…Acoustically-transparent deposits lay at the base of the scarp implying that evacuation was not complete after failure. based on published literature and framed in a well defined seismic stratigraphic context (Jorissen et al, 1993;Asioli 1996Asioli , 1999Asioli , 2001Trincardi et al, 1996;Capotondi et al, 1999;Ariztegui et al, 2000).…”

Section: Cores and Stratigraphymentioning

confidence: 78%

“…ruber and an oscillatory cooling trend as previously observed in the Central Adriatic (Asioli et al, 1999(Asioli et al, , 2001); 6) a glacial interval dominated by cold water species like Globigerina bulloides, Neogloboquadrina pachyderma and Globorotalia scitula (indicated as MIS 2 on Fig. 12).…”

Section: Cores and Stratigraphymentioning

confidence: 99%

Evidence of slope instability in the Southwestern Adriatic Margin

Minisini

Trincardi

Asioli

2006

Nat. Hazards Earth Syst. Sci.

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Abstract. The Southwestern Adriatic Margin (SAM) shows evidence of widespread failure events that generated slide scars up to 10 km wide and extensive slide deposits with run out distances greater than 50 km. Chirp-sonar profiles, side-scan sonar mosaics, multibeam bathymetry and sediment cores document that the entire slope area underwent repeated failures along a stretch of 150 km and that masstransport deposits, covering an area of 3320 km 2 , are highly variable ranging from blocky slides to turbidites, and lay on the lower slope and in the basin. The SAM slope between 300-700 m is impacted by southward bottom currents shaping sediment drifts (partly affected by failure) and areas of dominant erosion of the seafloor. When slide deposits occur in areas swept by bottom currents their fresh appearence and their location at seafloor may give the misleading impression of a very young age. Seismic-stratigraphic correlation of these deposits to the basin floor, however, allow a more reliable age estimate through sediment coring of the post-slide unit. Multiple buried failed masses overlap each other in the lower slope and below the basin floor; the most widespread of these mass-transport deposits occurred during the MIS 2-glacial interval on a combined area of 2670 km 2 . Displacements affecting Holocene deposits suggest recent failure events during or after the last phases of the last postglacial eustatic rise. Differences in sediment accumulation rates at the base or within the sediment drifts and presence of downlap surfaces along the slope and further in the basin may provide one or multiple potential weak layers above which widespread collapses take place. Neotectonic activity and seismicity, together with the presence of a steep slope, represent additional elements conducive to sediment instability and failure along the SAM. Evidence of large areas still prone to failure provides elements of tsunamogenic hazard.

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Predicting Discharge and Sediment flux of the Po River, Italy since the Last Glacial Maximum

Kettner

Syvitski

2008

Analogue and Numerical Modelling of Sedimentary Systems: From Understanding to Prediction

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HydroTrend numerically simulates the flux of water and sediment delivered to the coastal ocean on a daily timescale, based on drainage-basin and climate characteristics. The model predicts how a river may have behaved in the geological past, provided that appropriate assumptions are made regarding past climate and drainage-basin properties.HydroTrend is applied to simulate a high-resolution discharge and sediment flux record for the Po River in Italy since the Last Glacial Maximum (LGM). A validation experiment of 12 years duration under present conditions shows a high correlation (r 2 = 0.72) with 12 years observed daily discharge. Monthly variations in simulated Po River discharge and sediment discharge for this same time period show an even closer agreement (r 2 = 0.97) with the observed data.Community Climate System models (CCSM) indicate that during the LGM the Po drainage-basin climate was much colder and drier than at present. The drainage basin itself was much larger due to a lower sea level. The Bølling period is shown to be an exceptional period in our model study, with significantly higher discharges and sediment loads, as glacier ablation was more dominant.HydroTrend simulations predict an average suspended sediment flux of 46.6 Mt yr −1 and an average bedload of 0.83 Mt yr −1 for the Po River during the Late Pleistocene (21-10 cal. kyr BP). This is ∼75% greater than in the Holocene (10-0 cal. kyr BP), where simulations indicate a suspended sediment flux of 26.7 Mt yr −1 and a bedload of 0.53 Mt yr −1 . The Würm Stadial simulations tend to show the highest suspendedsediment concentrations. However, when considering sediment yield where load is normalized to unit area (mass per square kilometre per time), simulations indicate slightly higher yield for the Holocene as compared with the Late Pleistocene, respectively 336 t km −2 yr −1 versus 283 t km −2 yr −1 , due to an increase in Holocene precipitation. Despite the overall lower yields during the Pleistocene, the model indicates that glacial influence is a dominant factor on the total sediment flux to the ocean.

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Short-term climate changes during the Last Glacial-Holocene transition: comparison between Mediterranean records and the GRIP event stratigraphy

Cited by 69 publications

References 13 publications

Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records

Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records

Evidence of slope instability in the Southwestern Adriatic Margin

Predicting Discharge and Sediment flux of the Po River, Italy since the Last Glacial Maximum

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