28 Jul 2022
28 Jul 2022
Status: this preprint is currently under review for the journal CP.

Climate changes during the Lateglacial in South Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy

Mary Robles1,2, Odile Peyron2, Guillemette Ménot3, Elisabetta Brugiapaglia1, Sabine Wulf4, Oona Appelt5, Marion Blache2, Boris Vannière6,7, Lucas Dugerdil2, Bruno Paura1, Salomé Ansanay-Alex3, Amy Cromartie8, Laurent Charlet9, Stephane Guédron9, Jacques-Louis de Beaulieu10, and Sébastien Joannin2,4 Mary Robles et al.
  • 1Univ. Molise, Department of Agricultural, Environmental and Food Sciences, Campobasso, Italy
  • 2Univ. Montpellier, CNRS, IRD, EPHE, UMR 5554 ISEM, Montpellier, France
  • 3Univ. Lyon, ENSL, UCBL, UJM, CNRS, LGL-TPE, F-69007 Lyon, France
  • 4Univ. Portsmouth, School of the Environment, Geography and Geosciences, Portsmouth, United Kingdom
  • 5Helmholtz Centre Potsdam, GFZ German Research Centre of Geosciences, Section 3.6, Telegrafenberg, Potsdam, Germany
  • 6Chrono-Environnement, CNRS, Univ. Bourgogne Franche-Comté, Besançon, France
  • 7MSHE Ledoux, CNRS, Université Bourgogne Franche-Comté, Besançon, France
  • 8Cornell Univ., Department of Anthropology, Ithaca, NY, USA
  • 9Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
  • 10Aix-Marseille Univ., CNRS, IRD, UMR 7263 & 237 IMBE, Aix-en-Provence, France

Abstract. The Lateglacial (14,700–11,700 cal BP) is a key climate period marked by rapid but contrasted changes in the Northern Hemisphere. Indeed, regional climate differences have been evidenced during the Lateglacial in Europe and the Northern Mediterranean areas. However, past climate patterns are still debated since temperature and precipitation changes are poorly investigated towards the lower European latitudes. Lake Matese in Southern Italy is a key site in the Central Mediterranean to investigate climate patterns during the Lateglacial. This study uses a multi-proxy approach including magnetic susceptibility, geochemistry (XRF core scanning), pollen data and molecular biomarkers like branched Glycerol Dialkyl Glycerol Tetraethers (brGDGTs) to reconstruct climate changes and their impacts at Matese. Palaeotemperatures and -precipitation patterns are quantitatively inferred from pollen assemblages (multi-method approach: Modern Analogue Technique, Weighted Averaging Partial Least Squares regression, Random Forest, and Boosted Regression Trees) and brGDGTs calibrations. The results are compared to a latitudinal selection of regional climate reconstructions in Italy to better understand climate processes in Europe and in the circum-Mediterranean region. A warm Bølling–Allerød and a marked cold Younger Dryas are revealed in all climate reconstructions inferred from various proxies (chironomids, ostracods, speleothems, pollen, brGDGTs), showing no latitudinal differences in terms of temperatures across Italy. During the Bølling–Allerød, no significant changes in terms of precipitation are recorded, however, a contrasted pattern is visible during the Younger Dryas. Slightly wet conditions are recorded south of latitude 42° N whereas dry conditions are recorded north of latitude 42° N. During the Younger Dryas, cold conditions can be attributed to the southward position of North Atlantic sea-ice and of the Polar Frontal JetStream whereas the increase of precipitation is Southern Italy seems to be linked to relocation of Atlantic storm tracks into the Mediterranean, induced by the Fennoscandian ice sheet and the North European Plain. On the contrary, during the Bølling–Allerød warm conditions can be linked to the northward position of North Atlantic sea-ice and of the Polar Frontal JetStream.

Mary Robles et al.

Status: open (until 22 Sep 2022)

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Mary Robles et al.

Mary Robles et al.


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Short summary
Quantitative climate reconstructions based on pollen and brGDGTs reveal, for the Lateglacial, a warm Bølling–Allerød and a marked cold Younger Dryas in Italy, showing no latitudinal differences in terms of temperatures across Italy. In terms of precipitation, no latitudinal differences are recorded during the Bølling–Allerød whereas the latitudes 40–42° N appear as a key junction point between wetter conditions in Southern Italy and drier conditions in Northern Italy during the Younger Dryas.