Late-Glacial palaeotemperatures and palaeoprecipitations in the Aubrac Mountains (French Massif Central) reconstructed from multiproxy analyses (Coleoptera, chironomids and pollen)

Ponel, Philippe; Guiter, Frédéric; Gandouin, Emmanuel; Peyron, Odile; Beaulieu, Jacques‐Louis de

doi:10.1016/j.quaint.2022.02.005

Cited by 8 publications

(9 citation statements)

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“…The climate became distinctly warmer at 11 700 cal BP with the onset of the Holocene Interglacial (Rasmussen et al, 2014). These rapid and marked climate oscillations have been observed in the Greenland ice core records (Rasmussen et al, 2014) and in Europe from various proxies such as pollen, oxygen isotopes, molecular biomarkers, beetles and chironomids (Coope and Lemdahl, 1995;Ammann et al, 2000;Peyron et al, 2005;Lotter et al, 2012;Blaga et al, 2013;Moreno et al, 2014;Heiri et al, 2015;Ponel et al, 2022;Duprat-Oualid et al, 2022).…”

Section: Introductionmentioning

confidence: 85%

“…The proxies largely used to quantitatively reconstruct past climate changes are often a single-proxy approach (e.g., Heiri et al, 2015;Gandouin et al, 2016;Peyron et al, 2017;Marchegiano et al, 2020;Duprat-Oualid et al, 2022). Multiproxy approaches on the same sedimentary record, including independent climate proxies, are necessary to better understand the climate processes in Europe during the Late Glacial (Lotter et al, 2012;Ponel et al, 2022). Pollen-based reconstructions have the advantage of reconstructing temperatures, precipitation and seasonality; however, the climate signal can be perturbed by other factors such as CO 2 changes and human impact influencing vegetation development (Peyron et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Climate changes during the Late Glacial in southern Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy

et al. 2023

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Abstract. The Late Glacial (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 Late Glacial in Europe and the northern Mediterranean. 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 Late Glacial. This study aims to reconstruct climate changes and their impacts at Matese using a multi-proxy approach including magnetic susceptibility, geochemistry (XRF core scanning), pollen data and molecular biomarkers like branched glycerol dialkyl glycerol tetraethers (brGDGTs). Paleotemperatures and paleo-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 brGDGT 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 wetter conditions are recorded south of 42∘ N, whereas dry conditions are recorded north of 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 jet stream, whereas the increase in precipitation in 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. By contrast, warm conditions during the Bølling–Allerød can be linked to the northward position of North Atlantic sea ice and of the polar frontal jet stream.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Climate changes during the Late Glacial in southern Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy

et al. 2023

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“…The general assumption is that all proxies used to reconstruct climate changes are to some extent dependent on climatic parameters, but other factors can influence their distribution and/or abundance (e.g., human activities, biological processes, edaphic conditions, etc.) (Sugita et al, 2006;Huguet et al 2010;Martin et al, 2020;Ponel et al, 2022). In peat, this local environmental context can be understood through geochemical and sedimentary analyses based on X-ray fluorescence analysis (XRF) or loss on ignition (LOI), to investigate mineral inputs and organic matter content.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing 15,000 years of southern France temperatures from coupled pollen and molecular (brGDGT) markers (Canroute, Massif Central)

d'Oliveira

Dugerdil

Ménot

et al. 2023

Preprint

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Abstract. Climatic changes in southern Europe during the Holocene are characterised by a strong spatial and temporal heterogeneity whose patterns are still poorly understood, notably the presence or not of a Holocene thermal maximum (HTM; 10,000–6,000 cal. BP). The reconstructed climatic patterns also differ according to the proxies used (e.g., pollen, chironomid) and the latitude of the data. Here, a multi-proxy approach combining pollen and lipid biomarkers (branched Glycerol Dialkyl Glycerol Tetraethers, brGDGTs) is applied to the Canroute sedimentological sequence to reconstruct the climatic variation over the last 15,000 years in southern Massif Central, France. This area is poorly documented in terms of vegetation and climate. To provide reliable climate reconstructions, we have (1) performed a multi-method comparison based on transfer functions applied to pollen (MAT, WA-PLS, BRT) and molecular biomarkers (brGDGTs), (2) investigated the role of modern databases/calibrations in climate reconstructions. Three different calibration databases were tested for pollen data: one global based on a Eurasian Pollen Database, and two regional databases corresponding to Mediterranean/Temperate Europe and Temperate Europe/Scandinavian databases respectively. Nine global calibrations were tested for lipid biomarkers including eight for soil and one for peat. The use of different modern databases highlights the importance of considering environmental and ecological constraints when using transfer functions on pollen sequences. Pollen and brGDGT-inferred climate trends are consistent, notably for the Lateglacial, the Early and Late Holocene. However, the reconstructions notably differ concerning the presence of a Holocene thermal maximum with the Modern Analogue Technique (MAT) pollen-based method but not apparent with the BRT pollen method nor brGDGT. The temperature reconstructions estimated from the two independent pollen and lipid proxies are then compared to regional published climate signals (chironomids, pollen, molecular biomarkers) to better derive global regional climatic patterns in South Europe. Altogether, our results from the Canroute sequence and those already available in southern Europe reveal that for the Lateglacial and Early Holocene, the regional climate trends are coherent between sites and proxies, supporting the reliability of their reconstructions despite some discrepancies. During the Holocene, the temperature signal of Canroute does not indicate the clear presence of a pronounced mid-Holocene thermal maximum, but rather stable and warmer temperature compared to Lateglacial ones and overall negative anomalies compared to modern annual temperatures.

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“…These rapid and marked climate oscillations have been observed in the Greenland ice core records (Rasmussen et al, 2014) and in Europe from various proxies such as pollen, oxygen isotopes, molecular biomarkers, beetles, and chironomids (e.g. Coope and Lemdahl, 1995;Ammann et al, 2000;Coope and Lemdahl, 1995;Peyron et al, 2005;Lotter et al, 2012;Millet et al, 2012;Blaga et al, 2013;Moreno et al, 2014;Heiri et al, 2015;Ponel et al, 2022;Duprat-Oualid et al, 2022). Regional climate differences have been evidenced during the Lateglacial, and temperature trends in Europe and the Mediterranean region are still a matter of active research and debate.…”

Section: Introductionmentioning

confidence: 99%

“…Heiri et al, 2015;Gandouin et al, 2016;Peyron et al, 2017;Marchegiano et al, 2020;Duprat-Oualid et al, 2022). Multiproxy approaches on the same sedimentary record, including independent climate proxies, are necessary to better understand the climate processes in Europe during the Lateglacial (Lotter et al, 2012;Ponel et al, 2022). Pollen-based reconstructions have the advantage of reconstructing temperatures, precipitation, and seasonality, however, the climate signal can be perturbed by other factors such as CO2 changes and human impact influencing vegetation development (Peyron et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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

Mary

Peyron

Ménot

et al. 2022

Preprint

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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.

show abstract

Late-Glacial palaeotemperatures and palaeoprecipitations in the Aubrac Mountains (French Massif Central) reconstructed from multiproxy analyses (Coleoptera, chironomids and pollen)

Cited by 8 publications

References 68 publications

Climate changes during the Late Glacial in southern Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy

Climate changes during the Late Glacial in southern Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy

Reconstructing 15,000 years of southern France temperatures from coupled pollen and molecular (brGDGT) markers (Canroute, Massif Central)

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

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