WorldCat Identities

Berthier, Etienne

Overview
Works: 33 works in 41 publications in 2 languages and 91 library holdings
Genres: Trivia and miscellanea 
Roles: Author, Thesis advisor, Other, Opponent
Publication Timeline
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Most widely held works by Etienne Berthier
L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 29 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
150 questions sur l'océan et le climat : en direct avec les scientifiques by Étienne Berthier( Book )

2 editions published in 2012 in French and held by 6 WorldCat member libraries worldwide

Causes et conséquences du réchauffement sont décryptés dans ce livre
Brief communication: Unabated wastage of the Juneau and Stikine icefields (southeast Alaska) in the early 21st century by Étienne Berthier( )

2 editions published in 2018 in English and held by 4 WorldCat member libraries worldwide

Dynamique et bilan de masse des glaciers de montagne (Alpes, Islande, Himalaya) : contribution de l'imagerie satellitaire by Étienne Berthier( Book )

3 editions published between 2005 and 2007 in French and held by 4 WorldCat member libraries worldwide

In a context of general glacier retreat, a continuous and global monitoring of mountain glaciers is required but cannot be achieved thanks to ground measurements. In this thesis, we demonstrate that high resolution satellite optical images permit to observe the dynamic and volumetric evolutions of glaciers. Surface velocities of Mont Blanc glaciers (Alps) show short term (summer) fluctuations that are connected to the intensity of surface melting and subglacial hydrological network. A significant slow down (30 to 40\% in 20 years) of the Mer de Glace suggests that glacier dynamics play an important role in their response to climate change. For the Mont Blanc glaciers, thinning is enhanced in the ablation area during the last 10 years whereas, at higher elevation, no significant thickness change is detected
Winter mass balance of Drangajökull ice cap (NW Iceland) derived from satellite sub-meter stereo images by Joaquín M. C Belart( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Recent geodetic mass balance of Monte Tronador glaciers, northern Patagonian Andes by Lucas Ruiz( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Bilan de masse des glaciers islandais depuis 1945 : reconstruction et relation avec la variabilité climatique by Joaquín Muñoz-Cobo Belart( Book )

2 editions published in 2018 in English and held by 2 WorldCat member libraries worldwide

The mass balance of a glacier is strongly connected to climate. At high latitudes, mass balance is typically controlled by snow accumulation during the winter and the glacier ablation during the summer. In Iceland, direct mass balance observations have been mostly focused on the three largest ice caps (~600 to ~8000 km2), measured in situ for the last 25 years. There are, however, glaciers and ice caps distributed over all quarters of the country that lack mass balance observations. Remote sensing data with the capability to retrieve the glacier surface geometry through Digital Elevation Models (DEMs) are valuable tools to measure mass balance using the geodetic method. For a typical Icelandic glacier (with an area between 1 km2 and hundreds of km2), this can be optimally achieved from optical stereoscopic imagery, emplaced in airborne or spaceborne sensors, and from airborne lidar. This thesis focuses on remote sensing techniques to accurately measure geodetic mass balance from seasonal to decadal time spans and the relationship of mass balance to climate. As an example of seasonal mass balance, the winter mass balance of Drangajökull was measured from satellite sub-meter stereo images at the beginning, middle and end of the 2014-2015 winter using data from the Pléiades and WorldView-2 satellites. The results were complemented with in situ snow density measurements and validated with snow thickness measurements. The study concludes that images from the sensors mentioned above may often be used to monitor seasonal mass balance without tedious field logistics. A vast archive of aerial photographs exists for Iceland extending back to 1945. Since then, most glaciers were surveyed every 5 to 20 years. In addition, a wealth of modern satellite stereo images is available since the early 2000s as well as airborne lidar data in 2008-2013. This creates a unique dataset to construct a 70-year time series of geodetic mass balances.[...]
Reduced melt on debris-covered glaciers: investigations from Changri Nup Glacier, Nepal by Christian Vincent( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Massive collapse of two glaciers in western Tibet in 2016 after surge-like instability by Andreas Kääb( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Snow depth mapping from stereo satellite imagery in mountainous terrain: evaluation using airborne lidar data by César Deschamps-Berger( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

Analyse de la dynamique des glaciers himalayens et alpins à partir de 40 ans de données d'observation de la Terre by Amaury Dehecq( )

1 edition published in 2015 in French and held by 2 WorldCat member libraries worldwide

Mountain glaciers have a high societal impact, first at a local scale since they influence the water ressources and the touristic attractivity of a region, but also at a global scale, being major contributors to the present sea-level rise. Moreover, mountain glaciers are sensitive to climate forcing and are thus relevant indicators of past and present climate change and particularly present global warming. It is thus important to analyse the dynamic of these glaciers and quantify the changes that are affecting them so that their contribution to the Earth system and their future evolution can be better estimated. Satellite Earth Observation imagery, with its global coverage and repeated acquisition, represents a unique tool to quantify temporal changes affecting glaciers. The available archive is huge and the flux of new data will increase it even more.It is thus necessary to develop new methods to process this large archive.The objective of this thesis is to quantify the dynamic response of mountain glaciers in the Pamir-Karakoram-Himalaya (PKH) and in the Alps to a changing climate, with the use of the 40-year long satellite archive. We first developped a semi-automated processing chain to derive annual ice flow velocities from feature-tracking of satellite images. The chain takes advantage of the redundancy in the archive to obtain more spatially complete and robust velocity fields and to statistically estimate the uncertainty. Application to the Landsat archive leads to the determination of an unprecedented velocity field for the entire PKH region (~92 000 km2) for the period 1998-2014 and over the Alps (2 000 km2, period 1999-2014) with a coverage of 60-80 % and a mean uncertainty of 4 m/yr.. Flow velocities have been derived less systematically for the period 1972-1998 over the PKH. Secondly, the analysis of velocity changes show a slow-down of the glaciers for most of the 2 regions. The velocity changes are spatially contrasted and coherent with the patterns of elevation changes. In particular, glaciers in the Karakoram and West Kunlun that are stable or advancing show also a clear speed-up, whereas regions where thinning is the most important (Western Himalaya, Nyenchen Tangla, Alps) show the most important slow-down. The observed velocity changes is thus primarily determined by a climatic signal
Multi-decadal mass balance series of three Kyrgyz glaciers inferred from transient snowline observations by Martina Barandun( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Twenty-first century glacier slowdown driven by mass loss in High Mountain Asia by Amaury Dehecq( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Influence de la couverture détritique sur le bilan de masse des glaciers des Hautes Montagnes d'Asie : une approche multi-échelle by Fanny Brun( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

High Mountain Asia (HMA) hosts the largest glacierized area outside the polar regions. Approximately 15 % of the ~100 000 km² of HMA glaciers is covered by a debris layer of various thickness. The influence of this debris on the HMA glacier response to climate change remains debated. In principle, the presence of a thick layer of debris reduces the melt of the ice beneath it, due to the insulating effect. However, other processes such as ablation of bare ice cliff faces, subaqueous melt of supraglacial ponds and internal ablation due to englacial hydrology could substantially contribute to enhance the debris-covered glacier mass losses. The aim of this PhD work is to assess the impact of the debris on glacier mass balance in HMA. Up to now, the influence of the debris cover has been assessed through glacier front position changes or on a restricted sample of glaciers, and no large scale study of the influence of the debris cover on the glacier-wide mass balance is available.As a starting point, we derived glacier mass changes for the period 2000-2016 for the entire HMA, with an unprecedented resolution, using time series of digital elevation models (DEMs) derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) optical satellite imagery. We calculated a total mass loss of -16.3 ± 3.5 Gt yr-1 (-0.18 ± 0.04 m w.e. yr-1) with contrasted rates of regionally-averaged mass changes ranging from -0.62 ± 0.23 m w.e. yr-1 for the eastern Nyainqentanglha to +0.14 ± 0.08 m w.e. yr-1 for the western Kunlun Shan.At the scale of HMA, the pattern of glacier mass changes is not related to the presence of debris, but is linked with the climatology. Consequently, we studied the influence of the debris-cover on mass balance within climatically homogeneous regions. Based on the mass balances of individual glaciers larger than 2 km² (more than 6 500 glaciers, which represent 54% of the total glacierized area), we found that debris-covered glaciers have significantly more negative mass balances for four regions out of twelve, a significantly less negative mass balance for one region and non-significantly different mass balances for the remaining seven regions. The debris-cover is generally a less significant predictor of the mass balance than the slope of the glacier tongue or the glacier mean elevation. The influence of the debris is not completely clear and complicated to untangle from the effect of the other morphological parameters, because heavily debris-covered tongues are situated at lower elevations than debris-free tongues, where ablation is higher.However, such a statistical analysis of the influence of the debris-cover on the glacier-wide mass balance variability is not very informative in terms of glaciological processes. In order to better constrain the contribution of the different ablation processes on debris-covered tongues, work at a finer scale is required. For the debris-covered tongue of Changri Nup Glacier, Everest region, Nepal, we quantified the contribution of ice cliffs to the ablation budget. Using a combination of very high resolution DEMs derived from Pléiades images and an unmanned aerial vehicle, we found that ice cliffs contributed to ~23 ± 5 % of the total net ablation of the tongue, over two contrasted years, although they occupy only 7 to 8 % of its area. Ice cliffs are large contributors to the ablation of a debris-covered tongue, but they cannot alone explain the so-called debris cover anomaly, i.e. the fact that debris free and debris covered tongues have similar thinning rates. This anomaly is probably due to smaller emergence velocity over debris-covered tongues than over debris-free tongues, resulting in similar thinning rates, despite less negative surface mass balance rates. We advocate for more measurements of ice thickness of debris-covered tongues in order to better understand their dynamics
Can ice-cliffs explain the debris-cover anomaly? New insights from Changri Nup Glacier, Nepal, Central Himalaya by Fanny Brun( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Contribution à l'étude de l'évolution des glaciers et du changement climatique dans les Andes équatoriennes depuis les années 1950 by Rubén Basantes-Serrano( )

1 edition published in 2015 in French and held by 2 WorldCat member libraries worldwide

Caractérisation par satellite des échanges d'eau entre l'océan et les continents aux échelles interannuelles à décennales by Alejandro Blazquez( Book )

2 editions published in 2020 in English and held by 2 WorldCat member libraries worldwide

Depuis 2002, GRACE fourni des estimations des échanges d'eau entre l'océan et les continents. Cependant, ces estimations sont incertaines car elles montrent des écarts lorsque différentes approches et différents paramètres sont utilisés pour traiter les données GRACE. Je revois le traitement des données GRACE, en accordant une attention particulière aux différentes sources d'erreurs et d'incertitudes. L'incertitude dans le bilan global de l'eau, à des échelles annuelles à interannuelles est due à la corrections du mouvement du géocentre ainsi qu'à l'incertitude dans la correction du GIA. Cela est particulièrement vrai pour l'estimation de la masse de l'océan et les eaux continentales dont l'incertitude liée à la tendance pour la période 2005 à 2015 est de ±0.33mmSLE/yr
Ice cliff contribution to the tongue-wide ablation of Changri Nup Glacier, Nepal, central Himalaya by Fanny Brun( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Multi-decadal mass balance series of three Kyrgyz glaciers inferred from modelling constrained with repeated snow line observations by Martina Barandun( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Ice shelf basal melt rates from a high-resolution DEM record for Pine Island Glacier, Antarctica by David E Shean( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

 
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Audience level: 0.90 (from 0.81 for L'eau à d ... to 0.97 for Brief comm ...)

Alternative Names
Etienne Berthier ricercatore

Etienne Berthier wetenschapper

Languages
English (18)

French (9)