Birch-sedge communities, forest withdrawal and flooding at the beginning of Heinrich Stadial 3 at the southern Alpine foreland

Ravazzi, Cesare; Badino, Federica; Bertuletti, Paolo; Amicis, M De; Deaddis, Massimiliano; Garozzo, Lorena; Novellino, Massimo Domenico; Pini, Roberta

doi:10.1016/j.revpalbo.2020.104276

Cited by 4 publications

(6 citation statements)

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“…Between 30,904 and 30,088 (end of Fimon forest stage I) and 29,707–28,941 (start of Fimon forest stage II) cal BP (2σ errors) a millennial phase of major ecosystem transformation linked to GS 5.1 (HS 3) interval is documented (see the next section for further details). Our basal age for this interval also fits the modelled age of 29,675–30,964 cal BP (2σ error) from the site of Casaletto Ceredano 85 , indicating a significant increase in continentality in northern Italy related to a lockdown of moist westerlies intervening with the onset of HS 3 85 . Despite a general consistency between NGRIP and Fimon PD event stratigraphies, we observed a weaker signal agreement between 28.5 and 29.5 cal kBP.…”

Section: Discussionsupporting

confidence: 76%

The fast-acting “pulse” of Heinrich Stadial 3 in a mid-latitude boreal ecosystem

Badino

Pini

Bertuletti

et al. 2020

Sci Rep

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A 3800 year-long radiocarbon-dated and highly-resolved palaeoecological record from Lake Fimon (N-Italy) served to investigate the effects of potential teleconnections between North Atlantic and mid-to-low latitudes at the transition from Marine Isotope Stage (MIS) 3 to 2. Boreal ecosystems documented in the Fimon record reacted in a sensitive way to millennial and sub-millennial scale Northern Hemisphere atmospheric circulation patterns. The high median time-resolution of 58 years allows the identification of five abrupt event-boundaries (i.e., main forest expansion and decline excursions) synchronous with the sharp stadial/interstadial (GS/GI) transitions within dating uncertainties. During Heinrich Stadial 3 (HS 3) we reconstruct more open and dry conditions, compared to the other GS, with a dominant regional scale fire signal. Linkages between local fires and climate-driven fuel changes resulted in high-magnitude fire peaks close to GI/GS boundaries, even exacerbated by local peatland conditions. Finally, palaeoecological data from the HS 3 interval unveiled an internal variability suggesting a peak between 30,425 and 29,772 cal BP (2σ error) which matches more depleted δ18O values in alpine speleothems. We hypothesise that this signal, broadly resembling that of other mid-latitudes proxies, may be attributed to the southward shift of the Northern Hemisphere storm tracks and the associated delayed iceberg discharge events as documented during other HS.

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Section: Discussionsupporting

confidence: 76%

The fast-acting “pulse” of Heinrich Stadial 3 in a mid-latitude boreal ecosystem

Badino

Pini

Bertuletti

et al. 2020

Sci Rep

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“…Extensive wetlands developed in the lower megafan belts, in the water-saturated silty soils in the lowland areas, especially in the VFP (Miola et al, 2003;Serandrei Barbero et al, 2005). A birch swamp has been recently described in the lower Adda megafan (Ravazzi et al, 2018(Ravazzi et al, , 2020.…”

Section: Ecozones Of the Great Adriatic-po Region In The Last Glacial...mentioning

confidence: 99%

Hunter-gatherers across the great Adriatic-Po region during the Last Glacial Maximum: Environmental and cultural dynamics

Peresani

Monegato

Ravazzi

et al. 2021

Quaternary International

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“…High rates of sedimentation largely overcome uplift rates due to tectonic activity in depth, which are mainly related to the propagation of the Apennine thrust fronts (Maesano and D'Ambrogi, 2016). Fluvioglacial units deposited during the last glacial maximum (LGM) dominate the surface geology (Fontana et al, 2014; Ravazzi et al, 2020), although deeply entrenched and terraced by the post-glacial rivers (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

“…The surface projection of the main Alpine (red) and Apennine (green) structures underlying the Romanengo-Soresina tectonic depression (diagonal striped area) are superimposed on the present drainage. Numbers 1–6 indicate sites providing chronostratigraphic evidence of events that occurred in the last 40 ka; 1 = Montodine section and faulted belt; 2 = deformed pre-LGM peat belt supporting a fossil forest, close to Lodi; 3 = Casaletto Ceredano reference section for HS3-LGM alluvial aggradation chronostratigraphy (Ravazzi et al, 2020); 4 = deformed topography of the surface fan gradient at Pandino; 5 = Pulignano meander, an example of lateral erosion by the Adda River on the right scarp during the most recent (Medieval) evolution of the post-glacial valley; 6 = diversion point, where the Serio River was captured by head-wall erosion, forming the New Serio track; this Middle Age diversion led to abandonment of an earlier track (Dead Serio River track in Fig. 2 and Supplemental Material Appendix A, Supplementary Fig.…”

Section: Introductionmentioning

confidence: 99%

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Interplay of Holocene surface faulting and climate in the Central Po Plain, Italy

et al. 2021

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Understanding the recent events marking the late Quaternary history of the Po Plain (N-Italy) is of overriding importance to decipher the record of depositional versus erosional phases, and their interplay with climatic, tectonic, and human forcing. We reconstructed the structural setting and chronostratigraphy of a Holocene succession crosscut by a thrust fault located south of Montodine (Cremona, Italy) within the Po Plain. The fault shows a maximum displacement up to one meter. Radiocarbon dating fixes a minimum age of 11.9 cal ka BP for the postglacial river entrenchment and constrains the fault movement age between 5.9 and 3.4 cal ka BP. Undeformed Late Medieval coarse gravels cover the faulted succession. Due to the outcrop position, lying above the buried frontal thrusts of the Southern Alps and North Apennines, we propose that faulting results from secondary surface effects induced by seismic shaking. We discuss two main mechanisms, both related to lateral spreading, that can result in the formation of reverse faults close to the surface. The Soncino area, recording one of the strongest historical earthquakes of the central Po Plain (1802), is considered as a possible source for seismic shaking. The results of this study are a contribution for the assessment of the potential seismic hazard in one of the most populated regions of Europe.

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Birch-sedge communities, forest withdrawal and flooding at the beginning of Heinrich Stadial 3 at the southern Alpine foreland

Cited by 4 publications

References 55 publications

The fast-acting “pulse” of Heinrich Stadial 3 in a mid-latitude boreal ecosystem

The fast-acting “pulse” of Heinrich Stadial 3 in a mid-latitude boreal ecosystem

Hunter-gatherers across the great Adriatic-Po region during the Last Glacial Maximum: Environmental and cultural dynamics

Interplay of Holocene surface faulting and climate in the Central Po Plain, Italy

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