A5019504416- Cryospheric studies and observations
- Climate variability and models
- Climate change and permafrost
- Meteorological Phenomena and Simulations
- Soil Moisture and Remote Sensing
- Precipitation Measurement and Analysis
- Hydrology and Watershed Management Studies
- Geophysics and Gravity Measurements
- Arctic and Antarctic ice dynamics
- Environmental and Cultural Studies in Latin America and Beyond
- Climate change impacts on agriculture
- Flood Risk Assessment and Management
- Landslides and related hazards
- Tropical and Extratropical Cyclones Research
- Winter Sports Injuries and Performance
- Tree-ring climate responses
- GNSS positioning and interference
- Hydrology and Drought Analysis
- COVID-19 epidemiological studies
- Climate Change Policy and Economics
- Atmospheric and Environmental Gas Dynamics
- Climate Change, Adaptation, Migration
- Sustainability and Climate Change Governance
- Geology and Paleoclimatology Research
- Disaster Management and Resilience
University of Geneva
2018-2024
Federal Office of Meteorology and Climatology MeteoSwiss
2013-2023
Oeschger Centre for Climate Change Research
2019-2021
University of Bern
2020
University Hospital of Bern
2020
University of Zurich
2014
École Polytechnique Fédérale de Lausanne
1994
Abstract The performance of a new historical reanalysis, the NOAA–CIRES–DOE Twentieth Century Reanalysis version 3 (20CRv3), is evaluated via comparisons with other reanalyses and independent observations. This dataset provides global, 3-hourly estimates atmosphere from 1806 to 2015 by assimilating only surface pressure observations prescribing sea temperature, ice concentration, radiative forcings. Comparisons observations, reanalyses, satellite products suggest that 20CRv3 can reliably...
Abstract. Climate time series are of major importance for base line studies climate change impact and adaptation projects. However, instance, in mountain regions developing countries there exist significant gaps ground based records space time. Specifically, the Peruvian Andes spatially temporally coherent precipitation information is a prerequisite ongoing projects fields water resources, disasters food security. The present work aims at evaluating ability Tropical Rainfall Measurement...
Abstract. The role of glaciers as temporal water reservoirs is particularly pronounced in the (outer) tropics because very distinct wet/dry seasons. Rapid glacier retreat caused by climatic changes thus a major concern, and decision makers demand urgently for regional/local evolution trends, ice mass estimates runoff assessments. However, remote mountain areas, spatial data coverage typically scarce this further complicated high variability regions with complex topography. Here, we present...
Despite the fact that fast-growing population of Central Asia strongly depends on glacial melt water for fresh supply, irrigation and hydropower production, impact glacier shrinkage availability remains poorly understood.With an annual area loss 0.36 to 0.76%, glaciers are retreating particularly fast in northern Tien Shan, thus causing concern about future security densely populated regions Bishkek Almaty.Here, we use exceptionally long in-situ data series run calibrate a distributed...
Climate change and related impacts over the Indian Himalayan Region (IHR) remains poorly quantified.The present study reviews observed modelled changes in climate, cryosphere to hazards, agriculture ecosystems.An increasing temperature trend IHR is reported, which a few locations found be higher than global average.For precipitation, complex inconsistent response with considerable variation sign magnitude of observed.Future projections show significant warming.Climate-driven are clearly...
Projected future trends in water availability are associated with large uncertainties many regions of the globe. In mountain areas complex topography, climate models have often limited capabilities to adequately simulate precipitation variability on small spatial scales. Also, their validation is hampered by typically very low station density. Central Andes South America, a semi-arid high-mountain region strong seasonality, zonal wind upper troposphere good proxy for interannual variability....
ABSTRACT In situ climatological observations are essential for studies related to climate trends and extreme events. However, in many regions of the globe, observational records affected by a large number data quality issues. Assessing controlling such datasets is an important, often overlooked aspect research. Besides analysing measurement data, metadata important comprehensive assessment. missing, but may partly be reconstructed suitable actions as station inspections. This study...
Abstract Along with air temperatures, the freezing level height (FLH) has risen over last decades. The mass balance of tropical glaciers in Peru is highly sensitive to a rise FLH, mainly due decrease accumulation and increase energy for ablation caused by reduced albedo. Knowledge future changes FLH thus crucial estimating glacier extents. Since situ data are scarce at altitudes where exist (above ~4800 m above sea (asl)), reliable estimates must be derived from multiple types. Here we...
Abstract Despite the important role of supraglacial debris in ablation, knowledge thickness on Himalayan glaciers is sparse. A recently developed method based reanalysis data and thermal band satellite imagery has proved to be potentially suitable for estimation without need detailed field data. In this study, we further develop discuss possibilities limitations arising from its application a glacier Himalaya with scarce situ Surface temperature patterns are consistent 13 scenes Advanced...
Abstract. Damage caused by weather- and climate-related disasters have increased over the past decades, growing exposure wealth been identified as main drivers of this increase. Disaster databases are a primary tool for analysis disaster characteristics trends at global or national scales, they support risk reduction climate change adaptation. However, quality, consistency completeness different highly variable. Even though such variation critically influences outcome any study, comparative...
Abstract A probe of a patient, seeking help in an emergency ward French hospital late December 2019 because Influenza like symptoms, was retrospectively tested positive to COVID-19. Despite the early appearance virus Europe, prevalence and virulence appeared be low for several weeks, before spread severity symptoms increased exponentially, yet with marked spatial temporal differences. Here, we compare possible linkages between peaks fine particulate matter (PM2.5) sudden, explosive increase...
Extreme precipitation events with high local intensities, heavy snowfall or extensive freezing rain can have devastating impacts on society and economy. Not only is the quantitative forecast of such sometimes difficult associated large uncertainties, also are potential consequences highly complex challenging to predict. It thus a demanding task anticipate nowcast extreme precipitation, even more so in situations where human lives critical infrastructure might be at risk. In recent years,...
Abstract In the southern Peruvian Andes, communities are highly dependent on climatic conditions due to mainly rain‐fed agriculture and importance of glaciers snow melt as a freshwater resource. Longer‐term trends year‐to‐year variability precipitation or temperature severely affect living conditions. This study evaluates seasonal climatologies in period 1965/66–2017/18 for Andes using quality‐controlled homogenized station data new observational gridded data. this region, exhibits strong...
Abstract ERA5, the fifth‐generation reanalysis of European Center for Medium‐Range Weather Forecasts, provides long time series atmospheric fields at high spatial and temporal resolution. It allows detailed studies flow features such as blocks or cyclones. We investigate characteristics cyclones in ERA5 using different algorithms, compare results to ERA5's predecessor, ERA‐interim, how these depend on Generally, ERA‐interim characterize similarly. For Lagrangian detection tracking methods,...
Abstract In this study, we analyze the linkage between atmosphere and ocean modes winter flood variability over 20th century based on long‐term flow‐discharge series, historical archives, tree‐ring records of past floods in North Atlantic Basin (NAB). The most extreme occurred 1936 had strong impacts either side Atlantic. We hypothesize that joint effects sea surface temperatures (SSTs) Pacific Oceans Arctic Oscillation (AO), which is closely related to Oscillation, play a significant role...
CLIMANDES is a pilot twinning project between the National Weather Services of Peru and Switzerland (SENAMHI MeteoSwiss), developed within Global Framework for Climate World Meteorological Organization (WMO). Split in two modules, aims at improving education meteorology climatology support WMO Regional Training Center Peru, introducing user-tailored climate services regions Peruvian Andes. Four areas were prioritized first phase lasting from 2012 to 2015 introduce Peru. A demand study...
Abstract. The intensity and phase of precipitation at the ground surface can have important implications not only for meteorological hydrological situations but also in terms hazards risks. In field, Thies disdrometers are sometimes used to monitor quantity nature with high temporal resolution very low maintenance thus provide valuable information management Here, we evaluate disdrometer respect detection, as well estimation a pre-alpine site Switzerland (1060 m a.s.l.), using weighing gauge...
The snow-water equivalent (SWE) of the seasonal snow cover is an important component water cycle in Swiss Alps. It used for predicting discharge, short-range discharge forecasts and also assessing quality aspects. SWE has been measured every two weeks at about 50 stations located between 860 2,540 m a.s.l. more than 30 years. In addition there are special investigation areas with 600 2,900 where once per winter. main characteristics temporal spatial distributions analyzed. variations values...
The occurrence of El Niño has been generally considered the main driver hydro‐geomorphic processes in Peru. However, climatic characterization events (HGE) occurring absence remains scarce. Information contained DesInventar disaster database suggests a widespread HGE associated to cold‐neutral sea surface temperature (SST) central Pacific and south tropical Atlantic. Here, we aim at characterizing synoptic patterns with that have occurred over last 35 years related different types focusing...
Abstract. The Andes as mountain regions worldwide, provide fundamental resources, not only for the local population. Due to topographic characteristics, potential natural hazards is higher than elsewhere. In these areas, assessments of climate change impacts and development adequate adaptation strategies therefore become particular important. data basis, however, often scarce. Moreover, perceptions changes needs are divergent between national levels, which make implementation measures a...