A5041160305- Climate variability and models
- Tree-ring climate responses
- Geology and Paleoclimatology Research
- Advanced Fiber Optic Sensors
- Plant Water Relations and Carbon Dynamics
- Cryospheric studies and observations
- Particle Accelerators and Free-Electron Lasers
- Archaeology and ancient environmental studies
- Climate Change and Health Impacts
- Advanced MEMS and NEMS Technologies
- Spacecraft and Cryogenic Technologies
- Flood Risk Assessment and Management
- Climate change impacts on agriculture
- Air Quality and Health Impacts
- Pleistocene-Era Hominins and Archaeology
- Polar Research and Ecology
- Laser and Thermal Forming Techniques
- Atmospheric and Environmental Gas Dynamics
- Medical Imaging Techniques and Applications
- Oceanographic and Atmospheric Processes
- Hydrology and Watershed Management Studies
- Graph Theory and Algorithms
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Molecular Biology Techniques and Applications
University of Fribourg
2020-2024
Physikalisch-Meteorologisches Observatorium Davos
2023
University of Zurich
2014-2022
University of Bern
2011-2020
Oeschger Centre for Climate Change Research
2011-2020
ARC Centre of Excellence for Climate System Science
2016
The University of Melbourne
2011-2016
Monash University
2013-2016
V. B. Sochava Institute of Geography
2016
Swiss Federal Institute for Forest, Snow and Landscape Research
2013-2014
Abstract Reproducible climate reconstructions of the Common Era (1 CE to present) are key placing industrial-era warming into context natural climatic variability. Here we present a community-sourced database temperature-sensitive proxy records from PAGES2k initiative. The gathers 692 648 locations, including all continental regions and major ocean basins. trees, ice, sediment, corals, speleothems, documentary evidence, other archives. They range in length 50 2000 years, with median 547...
Tree-rings offer one of the few possibilities to empirically quantify and reconstruct forest growth dynamics over years millennia. Contemporaneously with growing scientific community employing tree-ring parameters, recent research has suggested that commonly applied sampling designs (i.e. how which trees are selected for dendrochronological sampling) may introduce considerable biases in quantifications responses environmental change. To date, a systematic assessment consequences design on...
Abstract. Climate trends in the Antarctic region remain poorly characterized, owing to brevity and scarcity of direct climate observations large magnitude interannual decadal-scale variability. Here, within framework PAGES Antarctica2k working group, we build an enlarged database ice core water stable isotope records from Antarctica, consisting 112 records. We produce both unweighted weighted isotopic (δ18O) composites temperature reconstructions since 0 CE, binned at 5- 10-year resolution,...
Abstract Instrumental meteorological measurements from periods prior to the start of national weather services are designated “early instrumental data.” They have played an important role in climate research as they allow daily decadal variability and changes temperature, pressure, precipitation, including extremes, be addressed. Early data can also help place twenty-first century climatic into a historical context such defining preindustrial its variability. Until recently, focus was on...
Abstract The past 1500 years provide a valuable opportunity to study the response of climate system external forcings. However, integration paleoclimate proxies with modeling is critical improving understanding dynamics. In this paper, model and proxy records are therefore used role natural anthropogenic forcings in driving global climate. inverse forward approaches data–model comparison applied, sources uncertainty identified discussed. first two case studies, simulations compared...
This study presents a comprehensive assessment of high-resolution Southern Hemisphere (SH) paleoarchives covering the last 2000 years. We identified 174 monthly to annually resolved climate proxy (tree ring, coral, ice core, documentary, speleothem and sedimentary) records from Hemisphere. assess interannual decadal sensitivity each record large-scale circulation indices Pacific, Indian Ocean regions over twentieth century. then analyse potential this newly expanded palaeoclimate network...
Abstract. Changes in climate affected human societies throughout the last millennium. While European cold periods 17th and 18th century have been assessed detail, earlier received much less attention due to sparse information available. New evidence from proxy archives, historical documentary sources model simulations permit us provide an interdisciplinary, systematic assessment of exceptionally period 15th century. Our includes role internal, unforced variability external forcing shaping...
We present the first spatially and temporally highly resolved gridded reconstruction of multi‐centennial precipitation variability for southern South America (SSA). A novel approach deriving 10,000 ensemble members based on varying predictor networks methodological settings allows identification spatiotemporal changes in SSA associated uncertainties. The summer winter reconstructions back to AD 1498 1590, respectively, provide new evidence increase an opposing decrease into 20th century....
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 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...
Accelerated warming and hiatus periods in the long-term rise of Global Mean Surface Temperature (GMST) have, recent decades, been associated with Interdecadal Pacific Oscillation (IPO). Critically, decadal climate prediction relies on skill state-of-the-art models to reliably represent these low-frequency variations. We undertake a systematic evaluation simulation IPO suite Coupled Model Intercomparison Project 5 (CMIP5) models. track pre-industrial (control) all-forcings (historical)...
Weather extremes can affect many different assets, sectors and systems of the human environment, including security, health well-being. that compound, such as heat drought, their interconnected risks are complex, difficult to understand thus a challenge for risk analysis management, because (in intertwined systems) impacts propagate through multiple sectors. In warming climate, extreme concurrent drought events expected increase in frequency, intensity duration, posing growing societies. To...
Abstract Model simulations and proxy-based reconstructions are the main tools for quantifying pre-instrumental climate variations. For some metrics such as Northern Hemisphere mean temperatures, there is remarkable agreement between models reconstructions. other diagnostics, regional response to volcanic eruptions, or hemispheric temperature differences, substantial disagreements data have been reported. Here, we assess potential sources of these discrepancies by comparing 1000-year based on...