Nicolas Guyennon
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View article: Mountain glaciers recouple to atmospheric warming over the twenty-first century
Mountain glaciers recouple to atmospheric warming over the twenty-first century Open
Recent studies have argued that air temperatures over many mountain glaciers are decoupled from their surroundings, leading to a local cooling which could slow down melting. Here we use a compilation of on-glacier meteorological observatio…
View article: What is climate change doing in the Himalaya? Thirty years of the Pyramid Meteorological Network (Nepal)
What is climate change doing in the Himalaya? Thirty years of the Pyramid Meteorological Network (Nepal) Open
Climate change is deeply impacting mountain areas around the globe, especially in the Himalaya. However, the lack of long-term meteorological observations at high elevations poses significant challenges to understanding and predicting impa…
View article: Permafrost thaw affects the chemistry of mountain ponds
Permafrost thaw affects the chemistry of mountain ponds Open
Permafrost is warming and thawing due to climate change. Among the related effects, water quality modification has gained increasing attention globally. Nevertheless, the impacts of diffuse permafrost thaw on water chemistry in high-mounta…
View article: Patterns of Snow Drought Under Climate Change: From Dry to Warm Dominance
Patterns of Snow Drought Under Climate Change: From Dry to Warm Dominance Open
Global warming may trigger more frequent snow droughts (SD). SD can result from low total precipitation (dry‐SD), high temperatures leading to less solid precipitation (warm‐SD), or a combination of both (dry‐warm compound SD). Those three…
View article: Isotopic and geochemical variability of rock glaciers spring waters in the eastern Italian Alps
Isotopic and geochemical variability of rock glaciers spring waters in the eastern Italian Alps Open
Due to the rapid shrinkage of mountain glaciers, subsurface ice, including ground ice stored in periglacial landforms such as rock glaciers (RGs), is expected to become a significant shallow groundwater reservoir under future climate warmi…
View article: Patterns of Snow Drought Under Climate Change: From Dry to Warm Dominance
Patterns of Snow Drought Under Climate Change: From Dry to Warm Dominance Open
Global warming may trigger more frequent snow droughts (SD). SD can result from low total precipitation (dry-SD), from high temperature leading to less solid precipitation (warm-SD) or from the combination of both (dry-warm compound SD). E…
View article: Intact rock glaciers as weathering reactors: influence on spring water quality
Intact rock glaciers as weathering reactors: influence on spring water quality Open
During the last decades, most glaciers have been retreating and losing mass in all high-mountain regions, where permafrost has also undergone warming, degradation, and ice loss. In this context, rock glaciers, a visual indication of the pr…
View article: What is climate change doing in Himalaya? Thirty years of the Pyramid Meteorological Network (Nepal)
What is climate change doing in Himalaya? Thirty years of the Pyramid Meteorological Network (Nepal) Open
Climate change is deeply impacting mountain areas around the globe, especially in Himalaya. However, the lack of long-term meteorological observations at high elevations poses significant challenges to understand and predict impacts at var…
View article: A parsimonious model for springs discharge reconstruction and forecast for drought management: Lessons from a case study in Central Italy
A parsimonious model for springs discharge reconstruction and forecast for drought management: Lessons from a case study in Central Italy Open
Study region: Karst springs located in Central Apennine ridge (Central Italy), in the Tiber River basin. Study focus: The assessment of water availability is a key issue in a water supply system because of increasing drought and water scar…
View article: Factors controlling the water quality of rock glacier springs in European and American mountain ranges
Factors controlling the water quality of rock glacier springs in European and American mountain ranges Open
Rock glaciers (RGs) provide significant water resources in mountain areas under climate change. Recent research has highlighted high concentrations of solutes including trace elements in RG-fed waters, with negative implications on water q…
View article: Temperature Decoupling on the World’s Mountain Glaciers
Temperature Decoupling on the World’s Mountain Glaciers Open
The development of a katabatic boundary layer can decouple near surface air temperature changes over glaciers from their surrounding environment during the ablation season, impacting the response of glaciers to ongoing climate change. Curr…
View article: Local cooling and drying induced by Himalayan glaciers under global warming
Local cooling and drying induced by Himalayan glaciers under global warming Open
Understanding the response of Himalayan glaciers to global warming is vital because of their role as a water source for the Asian subcontinent. However, great uncertainties still exist on the climate drivers of past and present glacier cha…
View article: Unprecedented snow-drought conditions in the Italian Alps during the early 2020s
Unprecedented snow-drought conditions in the Italian Alps during the early 2020s Open
Snow represents a fundamental water resource for mountain and lowland areas. Changes in the frequency and magnitude of snow droughts can significantly impact societies and ecosystems that rely on snowmelt to satisfy their water demands. He…
View article: An Insight into the Emergency Preparedness and Coping Capacity of Italian Water Utilities
An Insight into the Emergency Preparedness and Coping Capacity of Italian Water Utilities Open
The present work provides an insight into the emergency preparedness and coping capacity of Italian water utilities, based on the results of two ongoing research projects. Specific attention is given to the role that Water Safety Plans (WS…
View article: Long-term trend of snow water equivalent in the Italian Alps
Long-term trend of snow water equivalent in the Italian Alps Open
Snow stores a significant amount of water in mountain regions. The decrease of water storage in the snowpack can have relevant impacts on water supply for mountain and lowland areas that rely on snow melting. In this work, we modelled the …
View article: A Stepwise Modelling Approach to Identifying Structural Features That Control Groundwater Flow in a Folded Carbonate Aquifer System
A Stepwise Modelling Approach to Identifying Structural Features That Control Groundwater Flow in a Folded Carbonate Aquifer System Open
This paper concerns a stepwise modelling procedure for groundwater flow simulation in a folded and faulted, multilayer carbonate aquifer, which constitutes a source of good quality water for human consumption in the Apennine Range in Centr…
View article: A Step-Wise Modelling Approach to Identifying Structural Features That Control Groundwater Flow in a Folded Carbonate Aquifer System
A Step-Wise Modelling Approach to Identifying Structural Features That Control Groundwater Flow in a Folded Carbonate Aquifer System Open
This paper concerns about a stepwise modelling procedure for groundwater flow simulation in a complex carbonate, folded and faulted, multilayer aquifer, in the Apennine chain in Central Ita-ly, which constitutes a source of good quality wa…
View article: Factors Controlling the Hydraulic Efficiency of Green Roofs in the Metropolitan Area of Milan (Italy)
Factors Controlling the Hydraulic Efficiency of Green Roofs in the Metropolitan Area of Milan (Italy) Open
Green roofs (GRs) are considered sustainable solutions for the adaptation of urban water management to climate change. The use of GRs is particularly promising in urban environments like the Metropolitan Area of Milan, the most urbanized a…
View article: Do recent meteorological drought events in central Italy result from long‐term trend or increasing variability?
Do recent meteorological drought events in central Italy result from long‐term trend or increasing variability? Open
The Mediterranean area is one of the most important “hotspot” where the effects of climate change are more evident, with an increase of extreme events such as hot waves and intense droughts. From this perspective, central Italy, which in t…
View article: Climate change and water abstraction impacts on the long-term variability of water levels in Lake Bracciano (Central Italy): A Random Forest approach
Climate change and water abstraction impacts on the long-term variability of water levels in Lake Bracciano (Central Italy): A Random Forest approach Open
Study Region Lake Bracciano has been historically used as a strategic water reservoir for the city of Rome (Italy) since ancient times. However, following the severe water crisis of 2017, water abstraction has been completely stopped. Stud…
View article: Simple estimations of new and bulk snow density in the Italian Alps: Lessons from a decade of distributed observations
Simple estimations of new and bulk snow density in the Italian Alps: Lessons from a decade of distributed observations Open
<p>The Snow Water Equivalent (SWE), combining the information of snow depth and snow density is a necessary variable for snow-hydrological studies and applications, as well as, for ecological function or avalanche forecasting. Direct…
View article: The role of teleconnection patterns in the increased drought frequency in Mediterranean climate: Some hints from central Italy
The role of teleconnection patterns in the increased drought frequency in Mediterranean climate: Some hints from central Italy Open
<p>Central Italy presents numerous factors potentially affecting the precipitation regime: 1) it includes both Tyrrhenian and Adriatic sides, the first exposed to Atlantic perturbation and generally more rainy, the second one possibl…
View article: Impact of Synthetic Porous Medium Geometric Properties on Solute Transport Using Direct 3D Pore-Scale Simulations
Impact of Synthetic Porous Medium Geometric Properties on Solute Transport Using Direct 3D Pore-Scale Simulations Open
Transport processes in porous media have been traditionally studied through the parameterization of macroscale properties, by means of volume-averaging or upscaling methods over a representative elementary volume. The possibility of upscal…
View article: A Stakeholder Oriented Modelling Framework for the Early Detection of Shortage in Water Supply Systems
A Stakeholder Oriented Modelling Framework for the Early Detection of Shortage in Water Supply Systems Open
Management of water supply systems under shortage conditions due to drought requires computational tools able to relate the past precipitation regime over different time scales to future water resources availability. This work proposes a m…
View article: Red Algae Bloom Detection in Occhito Lake Combining MERIS and MODIS Data
Red Algae Bloom Detection in Occhito Lake Combining MERIS and MODIS Data Open
In winter 2008-2009, Lake Occhito, a strategic multiple-uses reservoir in South Italy, was affected by an extraordinary Planktothrix rubescens bloom. P. rubescens is a filamentous potentially toxic cyanobacterium which has recently coloniz…