Fabien Arnaud

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

Ph D

About

398
Publications
67,387
Reads
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5,759
Citations
Additional affiliations
September 2005 - present
French National Centre for Scientific Research
Position
  • Researcher position
October 2000 - December 2003
Université de Lille
Position
  • PhD Student
September 2000 - December 2003
Independent Researcher
Position
  • Ph D thesis

Publications

Publications (398)
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...
Preprint
The 8.2 ka event is regarded as the most prominent climate anomaly of the Holocene, and is thought to have been triggered by a meltwater release to the North Atlantic that was of sufficient magnitude to disrupt the Atlantic Meridional Overturning Circulation (AMOC). It is most clearly captured in Greenland ice-core records, where it is reported as...
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
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
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
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
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
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.
Presentation
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...
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
The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field in paleoecological research. Although largely applied nowadays, knowledge gaps remain in this field and there is therefore still research to be conducted to ensure the reliability of the sedimentary DNA signal. Building...
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...
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...
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
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...
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...
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...
Article
Full-text available
Large lakes of the world are habitats for diverse species, including endemic taxa, and are valuable resources that provide humanity with many ecosystem services. They are also sentinels of global and local change, and recent studies in limnology and paleolimnology have demonstrated disturbing evidence of their collective degradation in terms of dep...
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...
Article
The northeastern region of Brazil is the most densely populated and biodiverse semi-arid regions of the planet. Effects of the natural climate variability and colonization on the landscape have been described since the beginning of the 16th century but little is known about their effects on natural resources. Climate projections predict temperature...
Article
Full-text available
North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millenniums is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation Lake Bastani, on th...
Chapter
Natural organic matter in soils contains stable semiquinone radicals, the nature of which depends on their origin and their maturation state. The relative proportions of these radicals, deduced from simulations of the EPR spectrum, constitute a signature which can be used to differentiate soils and even their horizons. It allows us to monitor the t...
Article
Full-text available
Mountain grazing and ore processing had a significant impact on the Alpine environment in the last 5000 years, but few studies have so far focused on environmental changes of the south eastern Alps. This study investigates the vegetation history and sedimentary processes in the catchment of Lake Bohinj (Julian Alps, Slovenia), where a 12-m-long cor...
Article
The study of sediment cores allows for the reconstruction of past climate and environment through physical- chemical analysis. Nevertheless, this interpretation suffers from many drawbacks that can be overcome with the newest technologies. Hyperspectral imaging is one of these and allows a fast, high resolution, and non- destructive analysis of sed...
Article
Full-text available
Soil erosion is strongly linked to both precipitation patterns and land-use. We examine the effects of erosion and its drivers (i.e. human or/and climate) on soil evolution from the study of lacustrine archives in the northern French Alps. Multi-proxy analyses of the Lake Gers sediment sequence combined with the study of soils and rocks of its catc...
Article
Full-text available
Over the last decade, an increasing number of studies have used lake sediment DNA to trace past landscape changes, agricultural activities or human presence. However, the processes responsible for lake sediment formation and sediment properties might affect DNA records via taphonomic and analytical processes. It is crucial to understand these proce...
Article
Full-text available
Chronologies of lake-sediment records covering the last centuries to millennia are usually based on both short-lived radionuclides and radiocarbon dating. However, beyond the range of short-lived radionuclides, age model accuracy often suffers from large radiocarbon uncertainties. For high-altitude records, this issue is even more prominent as terr...
Article
Full-text available
The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. Accordingly, the lack of community-sanctioned data standards in paleoclimatology has largely precluded the benefits of Big Da...
Preprint
Full-text available
North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millennia is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation lake Bastani, in Cors...
Poster
Full-text available
The aim of this presentation is to overview some applications of hyperspectral imaging for sediment core analysis in paleo-environmental studies. The increase of the sensibility and the resolution of sensors, as well as the development of performant data processing methods allow the analyze of natural sample in a very informative (chemical, physica...
Conference Paper
L’analyse à haute résolution pour la caractérisation des échantillons est un des enjeux actuels pour obtenir des informations fines spatiales et structurales (chimie, physique, biologie). Un banc d’analyse multi-modules est en cours de développement au sein du laboratoire EDYTEM. Il sera composé de deux appareils photos (image HD et modèle numériqu...
Preprint
In the case of environmental samples, the use of a chemometrics-based prediction model is highly challenging because of the difficulty in experimentally creating a well-ranged reference sample set. In this study, we present a methodology using short wave infrared hyperspectral imaging to create a partial least squares regression model on a cored se...
Article
Full-text available
A high-resolution sedimentological and geochemical analysis of a 21m sediment sequence of Lake Iseo (Southern Alps, Italy) allowed for the reconstruction of the long-term flood frequency by visual identification of the event layers over the last 12 kyr cal BP. In a previous study that was undertaken on another sediment core from Lake Iseo, these la...
Article
In the case of environmental samples, the use of a chemometrics-based prediction model is highly challenging because of the difficulty in experimentally creating a well-ranged reference sample set. In this study, we present a methodology using short wave infrared hyperspectral imaging to create a partial least squares regression model on a cored se...
Article
Full-text available
Une analyse bibliométrique de la recherche française sur les sols a été effectuée par le Groupe Thématique sur les sols d'AllEnvi, à la fois sur le plan quantitatif (nombre d'articles, taux de citations) et qualitatif (place de la recherche française sur la scène internationale, type de collaborations nationales inter-organismes ou internationales,...
Article
For ecological and economic issues, evaluating the environmental fate of dissolved and suspended matter in catchments and river ecosystems still remains a challenge for the preservation and management of natural resources. Models are useful tools and may help to cope with this challenge, and especially to define the relationships between the state...
Article
Full-text available
Understanding wet avalanche intensity and the role of past environmental changes on wet avalanche occurrence is a main concern especially in the context of a warming climate and accelerated environmental mutations. Avalanches are closely related to fast cryosphere changes and may cause major threats to human society. Here, we used the sedimentary a...
Conference Paper
For solids environmental samples, spectroscopic properties can be analyzed but their interpretation is difficult due to the lack of common referential. For the spectroscopic images, pixels are relatively spatially referenced but in most cases, each sensor has his own spatial resolution. The sample used in this work is the first 30cm of a sedimenta...
Poster
Full-text available
Sedimentary cores are used, thanks to their physical, chemical and biological properties, to infer past climate and environment. Sampling methods (millimetre or centimetre) and routine analysis are destructive and non-spatially resolved methods that consume time and material. The use of hyperspectral imaging makes it possible to have micrometric ar...