Frédéric Herman
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View article: From XRD signal to erosion rate maps
From XRD signal to erosion rate maps Open
Understanding the spatio-temporal dynamics of suspended sediment source activation is essential for effective ecological management, risk assessment, and infrastructure planning. Provenance analysis, which traces sediment origins, plays a …
View article: ESR-thermochronometry of the MIZ1 borehole, Tono, Japan
ESR-thermochronometry of the MIZ1 borehole, Tono, Japan Open
Electron spin resonance (ESR) dating of quartz minerals offers a significant advantage over luminescence dating because of its later signal saturation. We seek to exploit this to develop a thermochronometry system capable of resolving rock…
View article: Retrieving climate proxies from an invertible glacier evolution model.
Retrieving climate proxies from an invertible glacier evolution model. Open
Glacier evolution models (GEMs) are important tools in glaciology to predict future glacier response from climate forcing. However, reconstructing past climates requires inversion tools to infer the climate forcing that explains paleoglaci…
View article: Unveiling the impact of Quaternary climate on mountain erosion: new insights from the Japanese Alps using novel trapped charge thermochronometry
Unveiling the impact of Quaternary climate on mountain erosion: new insights from the Japanese Alps using novel trapped charge thermochronometry Open
The influence of Quaternary climate (i.e., glacial-interglacial cycles) on mountain topography remains a topic of debate, largely due to the challenges associated with measuring surface processes over the recent geological past. A compelli…
View article: Retrieving climatic insights from the Last Glacial Maximum in the Alps using an inverted glacier model
Retrieving climatic insights from the Last Glacial Maximum in the Alps using an inverted glacier model Open
The climatic conditions, particularly the sources of precipitation that enabled extensive glacial growth during the Last Glacial Maximum (LGM) in the European Alps, remain poorly constrained. Here, we apply an inversion method to reconstru…
View article: A data-consistent model of the last glaciation in the Alps achieved with physics-driven AI
A data-consistent model of the last glaciation in the Alps achieved with physics-driven AI Open
25 thousand years ago, the European Alps were covered by a kilometre-thick body of ice, commonly described as the Alpine Ice Field. Numerical modelling of this glaciation has been challenged by persistent model-data disagreements, includin…
View article: Geodynamic and Climatic Forcing on Late‐Cenozoic Exhumation of the Southern Patagonian Andes (Fitz Roy and Torres del Paine massifs)
Geodynamic and Climatic Forcing on Late‐Cenozoic Exhumation of the Southern Patagonian Andes (Fitz Roy and Torres del Paine massifs) Open
High‐relief glacial valleys shape the modern topography of the Southern Patagonian Andes, but their formation remains poorly understood. Two Miocene plutonic complexes in the Andean retroarc, the Fitz Roy (49°S) and Torres del Paine (51°S)…
View article: Spontaneous Formation of an Internal Shear Band in Ice Flowing Over Topographically Variable Bedrock
Spontaneous Formation of an Internal Shear Band in Ice Flowing Over Topographically Variable Bedrock Open
Ice surface speed increases dramatically from upstream to downstream in many ice streams and glaciers. This speed‐up is thought to be associated with a transition from internal distributed deformation to highly localized deformation or sli…
View article: Retrieving climatic and temporal information from the last glacial maximum using an invert glacier model
Retrieving climatic and temporal information from the last glacial maximum using an invert glacier model Open
Understanding past natural climate variations during the Quaternary period is crucial for understanding the ongoing climate change. Glaciation events during the Quaternary have left visible footprints in today's landscape, such as moraines…
View article: Antarctic Peninsula glaciation patterns set by landscape evolution and dynamic topography
Antarctic Peninsula glaciation patterns set by landscape evolution and dynamic topography Open
The dimensions of past ice sheets provide a record of palaeoclimate but depend on underlying topography, which evolves over geological timescales by tectonic uplift and erosional downcutting. Erosion during the Pleistocene epoch (2,580 to …
View article: Modeling the spatially distributed nature of subglacial sediment transport and erosion
Modeling the spatially distributed nature of subglacial sediment transport and erosion Open
Glaciers expel sediment as they melt, in addition to ice and water. As a result, changing glacier dynamics and melt produce changes to glacier erosion and sediment discharge, which can impact the landscape surrounding retreating glaciers, …
View article: Geodynamic and climatic forcing on late-Cenozoic exhumation of the Southern Patagonian Andes (Fitz Roy and Torres del Paine massifs)
Geodynamic and climatic forcing on late-Cenozoic exhumation of the Southern Patagonian Andes (Fitz Roy and Torres del Paine massifs) Open
Deep incised glacial valleys surrounded by high peaks form the modern topography of the Southern Patagonian Andes. Two Miocene plutonic complexes in the Andean retroarc, the cores of the Fitz Roy (49°S) and Torres del Paine (51°S) massifs,…
View article: Climatic control on seasonal variations in mountain glacier surface velocity
Climatic control on seasonal variations in mountain glacier surface velocity Open
Accurate measurements of ice flow are essential to predict future changes in glaciers and ice caps. Glacier displacement can in principle be measured on the large scale by cross-correlation of satellite images. At weekly to monthly scales,…
View article: Out-of-sequence fault activity in the High Himalaya revealed by luminescence thermochronometry
Out-of-sequence fault activity in the High Himalaya revealed by luminescence thermochronometry Open
Two end-member competing models have been proposed to describe the kinematics of the central Nepal Himalayas in the last few Myr. They differ in their interpretations of which surface breaking faults accommodate current shortening and the …
View article: Will ESR thermochronometry reveal the timing of Rhône valley incision?
Will ESR thermochronometry reveal the timing of Rhône valley incision? Open
The impact of Quaternary climate change on landscape evolution, and more specifically the timing of incision of the overdeepened Alpine valleys, remains difficult to quantify with existing thermochronometric methods. Thermochronometers are…
View article: Climatic control on seasonal variations of moutain glacier surface velocity
Climatic control on seasonal variations of moutain glacier surface velocity Open
Glacier displacement can in principle be measured at the large-scale by cross-correlation of satellite images. At weekly to monthly scales, the expected displacement is often of the same order as the noise for the commonly used satellite i…
View article: High-relief exhumation history in the Japanese Alps within the past 1 Ma inferred from trapped charge thermochronometry
High-relief exhumation history in the Japanese Alps within the past 1 Ma inferred from trapped charge thermochronometry Open
The interactions between Earth surface processes, climate and tectonics determine the landscape in mountain regions. The Japanese Alps uplifted throughout the Quaternary and now reach elevations of up to 3,000 m. However, quantifying relie…
View article: Tracking coarse sediment in an Alpine subglacial channel using radio-tagged particles
Tracking coarse sediment in an Alpine subglacial channel using radio-tagged particles Open
Temperate Alpine glaciers produce substantial quantities of sediment that are exported via active subglacial meltwater channels to their proglacial environments. Measurements of suspended sediment and bedload in proglacial rivers have been…
View article: Eustatic change modulates exhumation in the Japanese Alps
Eustatic change modulates exhumation in the Japanese Alps Open
The exhumation of bedrock is controlled by the interplay between tectonics, surface processes, and climate. The highest exhumation rates of centimeters per year are recorded in zones of highly active tectonic convergence such as the Southe…
View article: Climatic control on seasonal variations of glacier surface velocity
Climatic control on seasonal variations of glacier surface velocity Open
Accurate measurements of ice flow are essential to predict future changes in glaciers and ice caps. Glacier displacement can in principle be measured at the large-scale by cross-correlation of satellite images. At weekly to monthly scales,…
View article: Quantification of post-glacier bedrock surface erosion in the European Alps using <sup>10</sup> Be and optically stimulated luminescence exposure dating
Quantification of post-glacier bedrock surface erosion in the European Alps using <sup>10</sup> Be and optically stimulated luminescence exposure dating Open
The retreat of glaciers since the Last Glacial Maximum in the European Alps has left an imprint on topography through various erosional processes. However, few methods are currently capable of resolving these mechanisms on Late Glacial to …
View article: The effects of (supra-, en-, and sub-glacial) sediment on mountain glaciers
The effects of (supra-, en-, and sub-glacial) sediment on mountain glaciers Open
<p>In mountainous environments, steep hillslopes tend to erode rapidly. These hillslopes, where present above glaciers, trundle rocks onto glacier surfaces below them. The loose rocks (debris) are subsequently transported along with …
View article: The spatially distributed nature of subglacial sediment dynamics: using a numerical model to quantify sediment transport and bedrock erosion across a glacier bed in response to glacier behavior and hydrology
The spatially distributed nature of subglacial sediment dynamics: using a numerical model to quantify sediment transport and bedrock erosion across a glacier bed in response to glacier behavior and hydrology Open
In addition to ice and water, glaciers expel sediment. As a result, changing glacier dynamics and melt will result in changes to glacier erosion and sediment discharge, which can impact the landscape surrounding retreating glaciers, as wel…
View article: Orogen‐Parallel Migration of Exhumation in the Eastern Aar Massif Revealed by Low‐T Thermochronometry
Orogen‐Parallel Migration of Exhumation in the Eastern Aar Massif Revealed by Low‐T Thermochronometry Open
New and published (U‐Th)/He data on zircon, apatite, and zircon fission track ages constrain the thermal overprint and cooling history of the eastern Aar Massif, Switzerland. The timing and pattern of cooling is in agreement with independe…
View article: Bias and error in modelling thermochronometric data: resolving a potential increase in Plio-Pleistocene erosion rate
Bias and error in modelling thermochronometric data: resolving a potential increase in Plio-Pleistocene erosion rate Open
Thermochronometry provides one of few methods to quantify rock exhumation rate and history, including potential changes in exhumation rate. Thermochronometric ages can resolve rates, accelerations, and complex histories by exploiting diffe…