Pierre Sabatier

Pierre Sabatier
Université Savoie Mont Blanc | UdS · EDYTEM Laboratory of Environment Dynamics and Territories of the Mountain

Lecturer in Earth sciences at EDYTEM lab

About

233
Publications
52,964
Reads
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Introduction
Paleoclimate, extreme events (Storm, Flood, Cyclone), geochemistry, sedimentology, geochronology (short-lived radionuclides, radiocarbon), lake and lagoon sediments, paleoenvironment... Web page : http://edytem.univ-savoie.fr/annuaire/SABATIER-Pierre
Additional affiliations
September 2010 - present
Université Savoie Mont Blanc
Position
  • Lecturer
October 2009 - August 2010
Université Paris-Sud 11
Position
  • PostDoc Position
September 2006 - September 2009
Université de Montpellier
Position
  • PhD
Description
  • PhD in Paleoclimate with Sedimentology/Geochemistry approach in lagoon sediment.
Education
September 2001 - September 2009
Université de Montpellier
Field of study
  • Earth Sciences

Publications

Publications (233)
Article
Full-text available
Event deposits in lake sediments provide invaluable chronicles of geodynamic and climatic natural hazards on multi-millennial timescales. Sediment archives are particularly useful for reconstructing high-impact, low-frequency events, which are rarely observed in instrumental or historical data. However, attributing a trigger mechanism to event depo...
Article
Owing to the combined impact of human encroachment and global climate change, river flood hazards have increased around the world. Over the past decades, rapid warming has augmented atmospheric moisture fluxes. The resulting intensification of the hydrological cycle, as evident from instrumental records, is linked to more frequent and severe floodi...
Article
Full-text available
Small mountain lakes are natural archives for understanding long‐term natural and anthropogenic impact on the environment. This study focused on long‐term (last ca. 13 000 years) vegetation changes and sedimentary processes in the catchment area of Lake Planina pri jezeru (1430 m a.s.l.) by using mineralogical, geochemical and palynological methods...
Article
Scrub Island lagoon (Anguilla, Caribbean) provides the opportunity to display both tropical cyclones, near-field and far-field tsunami deposits within the same sediment core. Here, we use X-ray tomography to highlight the sedimentary fabric and link it to processes that occurred during these events. Overall, the tsunami sedimentary fabric remains h...
Article
Full-text available
The trajectories of mountain socio-ecosystems are complex and influenced by numerous factors (climate, human practices, slope, etc.). This study combined methods used in palynology, ecology and history to produce complementary data to improve understanding of the trajectories of an alpine socio-ecosystem over the last 500 years. Past changes in veg...
Article
Full-text available
Hyperspectral imaging is a recent technology that has been gaining popularity in the geosciences since the 1990s, both in remote sensing and in the field or laboratory. Indeed, it allows the rapid acquisition of a large amount of data that are spatialized on the studied object with a low-cost, compact, and automatable sensor. This practical article...
Article
Full-text available
Over the last two millennia, European Alpine ecosystems have experienced major changes in response to the important, yet fluctuating, impact of human activities. This study aims to reconstruct the environmental history of the last 1800 years on the western edge of the Alps by analyzing sediments from Lake Aiguebelette, a large lake located in the p...
Article
Atmospheric nuclear tests (1945-1980) have led to radioactive fallout across the globe. French tests in Polynesia (1966-1974) may influence the signature of fallout in South America in addition to those conducted by USA and former USSR until 1963 in the Northern hemisphere. Here, we compiled the 240Pu/239Pu atom ratios reported for soils of South A...
Conference Paper
Full-text available
Understanding past water-level changes are essential to human development. Changes in lake levels can result in the displacement of populations due to rising water levels, or be a limiting factor in the case of irrigation for agriculture or in terms of water resources. Lake-level fluctuations can be the consequence of outlet modification, human act...
Article
No megathrust earthquake similar to the Magnitude class 9 events in Sumatra in 2004 or in Japan in 2011 was firmly reported at the Lesser Antilles subduction zone. The largest known tsunamis followed either a strong intraplate earthquake (1867, Virgin Islands) or were transoceanic due to the 1755 Lisbon earthquake. In this region, where the converg...
Article
Full-text available
Flooding is a pervasive natural hazard—costly in both human and economic terms—and climate change will probably exacerbate risks around the world. Mountainous areas, such as the densely populated European Alps, are of particular concern as topography and atmospheric conditions can result in large and sudden floods. In addition, the Alps are experie...
Article
Full-text available
The sedimentary processes in the deep basin of large peri-Alpine lakes have not been studied much on long timescales due to high coring complexity of such lake systems. In 2018, a 15.5 m long sediment section was retrieved from the deep basin of Lake Iseo (Italy) at 251 m water depth. A seismic survey associated to a multi-proxy approach with sedim...
Article
Full-text available
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a family of bacterial lipids which have emerged over time as robust temperature and pH paleoproxies in continental settings. Nevertheless, it was previously shown that other parameters than temperature and pH, such as soil moisture, thermal regime or vegetation can also influence the rela...
Article
Hyperspectral imaging (HSI) is a non-destructive, high-resolution imaging technique that is currently under significant development for analyzing geological areas with remote devices or natural samples in a laboratory. In both cases, the hyperspectral image provides several sedimentary structures that must be separated to temporally and spatially d...
Article
Full-text available
Full text here : https://rdcu.be/cAvw9
Article
Full-text available
Dating recent sediment archives (<150 years) constitutes a prerequisite for environmental and climatic reconstructions. Radiocaesium (137Cs) emitted during thermonuclear bomb testing (1950–1980) and nuclear accidents and the decrease in excess lead-210 (210Pbxs) with depth are often combined to establish sediment core chronology. Although these met...
Poster
The study of critical zone processes requires various approaches from the field to the laboratory. Analytical approaches using different sensors allow to characterize this thin and heterogeneous layer of the Earth. While algorithmic approaches based on machine learning and deep learning extract information of interest from these data. Sedimentary a...
Article
The reconstruction of millennial-scale interactions between ecosystems and societies can provide unique and valuable references for understanding the creation of cultural landscapes and help elucidate their value, weaknesses and legacies. Among the most emblematic forms of Mediterranean land use, olive groves and pastoralism have occupied a promine...
Article
Full-text available
Soil erosion is one of the main environmental threats affecting the Critical Zone (CZ) and thus ecosystem services and human societies. Through time, physical erosion is linked to both climate variations and the landscape evolution under long-term human pressures. In mountainous areas where erosion is highest a combination of large spatial and temp...
Presentation
Full-text available
Soil erosion is one of the main environmental threats affecting the Critical Zone (CZ) and represents an emerging concern considered as one of the geosciences/society central issues. Through time, the physical erosion is linked to both climate fluctuations and land-use. Understanding these forcing factors is key to improve our management of this re...
Article
Full-text available
Gram-negative bacteria produce specific membrane lipids, i.e. 3-hydroxy fatty acids with 10 to 18 C atoms. They have been recently proposed as temperature and pH proxies in terrestrial settings. Nevertheless, the existing correlations between pH or temperature and indices derived from 3-OH FA distribution are based on a small soil dataset (ca. 70 s...
Article
This study presents the results of paleo-tsunami investigation in marshes of the southern and eastern coasts of Martinique Island (Lesser Antilles, France). A sand unit dated 1726–1813 cal. CE at 30 cm depth at Anse Meunier represents the most convincing evidence of high-energy coastal flooding of the last 5000 years on the island. Sedimentological...
Preprint
Full-text available
Dating recent sediment archives (<150 years) constitutes a prerequisite for environmental and climatic reconstructions. Radiocaesium (137Cs) emitted during thermonuclear bomb testing (~1950 ̶ 1980) and nuclear accidents, as well as the decrease of excess lead-210 (210Pbxs) with depth are often combined to establish sediment core chronology. Althoug...
Article
Full-text available
Human activities impact erosion and transport processes in catchments, hence disturbing paleoclimate recording. A thorough study of erosion patterns is therefore necessary to disentangle climate and human forcing when interpreting lake sediment-based flood chronicles.
Conference Paper
Full-text available
Lake Iznik (NW Turkey), is bordered by the middle strand of the North Anatolian Fault (MNAF), whose seismic activity is debated because of its quiescence during the instrumental period. In contrast, significant historical activity is documented by several chronicles over the last two millennia. This study aims to get a new insight into its long-te...
Presentation
Full-text available
Dating recent sediment archives (<150 years) constitutes a prerequisite for environmental and climatic reconstructions. Radiocaesium (137Cs) emitted during thermonuclear bombs testing (~1950-1980) and nuclear accidents (1986 and 2011) was generally used for identifying sediment sources or for establishing sediment core chronology based on discrete...
Article
Full-text available
Uranium (U) isotopic signatures and concentration in sediments are widely used as paleo-redox proxies, as the behavior of U is often controlled by bottom water oxygenation. Here, we investigated the processes controlling U accumulation in the sediments of Lake Nègre (Mediterranean Alps, South-East France) over the past 9200 years. Exceptionally hig...
Conference Paper
Full-text available
Soil erosion is one of the main environmental threats affecting the Critical Zone (CZ) and thus ecosystem services and human societies. This represents an emerging concern considered as one of the geosciences/society central issues. Through time, the physical erosion is linked to both, precipitation amounts induced by climate fluctuations, and the...
Article
Full-text available
Regime shifts are major reorganization of ecological processes, creating new sets of mechanisms that drive the new ecological regime. Such rearrangements can affect how and how much the system responds to pressures other than those that created the shift (interactive carryover). Lake Geneva still exhibits high levels of productivity despite reducti...
Article
Copper, silver, and gold exploitation has been a foundation of economic and socio-cultural development of Andean societies, at least for the last three millennia. The main centers of pre-colonial metallurgy are well-known from archaeological artifacts, but temporal gaps inherent in this record handicap a finer understanding of the modalities of ore...
Article
Full-text available
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a family of bacterial lipids widely used for temperature and pH reconstructions in terrestrial settings. 3-hydroxy fatty acids (3-OH FAs) with 10 to 18 carbon atoms, produced by Gram-negative bacteria, have been recently proposed as independent and complementary proxies of temperature and...
Article
Full-text available
The widespread use of pesticides in agriculture during the last several decades has contaminated soils and different Critical Zone (CZ) compartments, defined as the area extended from the top of the vegetation canopy to the groundwater table, and it integrates interactions of the atmosphere, lithosphere, biosphere, and hydrosphere. However, the lon...
Article
The long-term fate of uranium-contaminated sediments, especially downstream former mining areas, is a widespread environmental challenge. Essential for their management is the proper understanding of uranium (U) immobilization mechanisms in reducing environments. In particular, the long-term behavior of noncrystalline U(IV) species and their possib...
Article
Full-text available
The seismic activity of the middle strand of the North Anatolian Fault (MNAF), Northwestern Turkey, is debated because of its quiescence during the instrumental period, in contrast to a significant historical activity documented by several chronicles over the last two millennia. Here, we focus on Lake Iznik, bordered by the MNAF, to get a new insig...
Chapter
As a rupture in the sediment cascade, lakes are perfect traps for most river-borne particulate matters. As such they concentrate erosive fluxes which are also information fluxes as they derive from the functioning of surrounding terrestrial social-ecological systems. As such, they offer a great opportunity to reconstruct the Earth Critical Zone dyn...
Preprint
Full-text available
3-hydroxy fatty acids (3-OH FAs) with 10 to 18 C atoms are membrane lipids mainly produced by Gram-negative bacteria. They have been recently proposed as temperature and pH proxies in terrestrial settings. Nevertheless, the existing correlations between pH/temperature and indices derived from 3-OH FA distribution (RIAN, RAN15 and RAN17) are based o...
Article
Human activities have greatly increased the influx of pollutants into global freshwater ecosystems. Understanding the pollution patterns at multi-decadal scales, and how the socio-economic development and public policy have shaped them, are crucial to assess the current status of environmental quality and develop sound strategies for watershed mana...
Article
The Lesser Antilles are a densely populated region where local populations and industrial facilities are concentrated at the coastlines, and are therefore exposed to many rapid-onset hazards such as hurricanes and tsunamis. However, the historical catalog of these events is too short to allow risk assessment and return period estimations, and it ne...
Article
Short-lived radionuclides are measured in surface sediment to provide a geochronology for the past century. Age-depth models are produced from ²¹⁰Pbex activity-derived sedimentation rates and corroborated by known events, such as ¹³⁷Cs and ²⁴¹Am activities that are result of fallout from nuclear weapon tests and the Chernobyl accident. Different me...
Article
Full-text available
Long-term changes in flood activity have often been reconstructed to understand their relationships to climate changes. This requires identification of flood layers according to certain characteristics (e.g., texture, geochemical composition, grain-size) and then to count them using naked-eye observation. This method is, however, time-consuming, an...
Preprint
Full-text available
Few of the large Southern peri-alpine lakes have been studied with a sedimentological approach in their deep basin to understand the dynamics of their long-term sedimentation due, among other factors, to the high complexity of the coring in such deep lakes. In 2018, a 15.5 m-long sediment section was retrieved from the deep basin of Lake Iseo (Ital...
Article
A suite of limnological proxies measured in clastic sediments of the glacier-fed Lake Ala Kol (NE Kyrgyzstan) document palaeoenvironmental change and glacier fluctuations in the central Tien Shan over the last millennium. Rock magnetic and geochemical data provide supporting evidence for three glacier expansion episodes occurring in 1200–1400 CE, 1...
Article
Palaeomeanders are characteristic features of meandering river floodplains. Some were abandoned several millennia ago and can be used as evidence for past fluvial patterns. Despite many observations of changes undergone by meandering rivers, little is known about long-term morphological adjustment of meanders. This paper reports on investigations c...
Preprint
Full-text available
Long-term changes in flood activity have often been reconstructed to understand their relationships to climate changes. This requires identification of flood layers according to certain characteristics (e.g., texture, geochemical composition, grain-size) and then to count them using naked-eye observation. This method is, however, time-consuming, an...
Preprint
Full-text available
Hyperspectral imaging (HSI) is a non-destructive high-resolution sensor, which is currently under significant development to analyze geological areas with remote devices or natural samples in a laboratory. In both cases, the hyperspectral image provides several sedimentary structures that need to be separated to temporally and spatially describe th...
Article
Forcings and mechanisms underlying Holocene climate variability still remain poorly. This work review already published paleoclimatic time series and proposes an alternative way to compare them using spectral analysis. Such an approach may emphasize joint features between different signals and lead us closer to the causes of climate changes. Ten pa...
Preprint
Full-text available
Up to now, no geochemical or geochronological data has been published about Holocene volcanic activity on the Kerguelen Archipelago. Here we present the first continuous Holocene chronology of volcanic eruptions on the archipelago. We compared sedimentological, geochronological and geochemical data from two lake sediment cores taken in two differen...
Conference Paper
Full-text available
Due to global climate changes, an intensification of extreme events such as floods is expected in many regions, affecting an increasing number of people. An assessment of the flood frequencies is then a public concern. For several years now, numerous studies are undertaken on geological paleoclimate records and especially on lake sediments to under...
Conference Paper
Full-text available
Here we present the first Holocene-long continuous chronology of volcanic eruptions on Kerguelen archipelago, where no evidence of Holocene volcanic activity has been published so far. Our chronicle is based upon sedimentological, chronological and geochemical data form two sediment cores, taken in two different depocenters of a large lake, Lake Ar...
Article
Sediments of Lake Paravani, the largest natural lake in the South Caucasus, were analysed to reconstruct the millennial history of the environment. Pollen analysis, previously undertaken on the first core retrieved in the middle of the lake, revealed a vegetation history for the last 12 millennia. As part of the present study, a new core was taken...