Christoph Welker

ORCID: 0000-0002-6866-516X
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About
Contact & Profiles
Research Areas
  • Meteorological Phenomena and Simulations
  • Climate variability and models
  • Tropical and Extratropical Cyclones Research
  • Wind and Air Flow Studies
  • Tree-ring climate responses
  • Flood Risk Assessment and Management
  • Cryospheric studies and observations
  • Tree Root and Stability Studies
  • Polar Research and Ecology
  • Ocean Waves and Remote Sensing
  • Plant Water Relations and Carbon Dynamics
  • Marine and coastal ecosystems
  • Insurance and Financial Risk Management
  • Adventure Sports and Sensation Seeking
  • Oceanographic and Atmospheric Processes
  • Aeolian processes and effects
  • Geophysics and Gravity Measurements

Oeschger Centre for Climate Change Research
2012-2016

University of Bern
2012-2016

V. B. Sochava Institute of Geography
2016

German Climate Computing Centre
2013

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2013

Studying a suff ciently large sample of extremes or analysing the statistics their occurrence, including trends, is hampered by length existing observation-based record.New data sets such as Twentieth Century Reanalysis (20CR), which consists an ensemble 56 members, signif cantly extend our record back in time.In this paper, we present examples winds at northern hemisphere mid-latitudes 20CR to illustrate challenges and opportunities for over longer period than previously possible.For four...

10.1127/0941-2948/2012/0337 article EN Meteorologische Zeitschrift 2012-02-01

Assessments of local-scale windstorm hazard require highly resolved spatial information on wind speeds and gusts. In this study, maximum (peak) sustained a 3-km horizontal grid over Switzerland are obtained by dynamical downscaling from the Twentieth Century Reanalysis (20CR) employing Weather Research Forecasting (WRF) model. Subsequently, simulated peak gusts derived using four gust parameterizations (WGPs). Evaluations against observations at 63 locations in complex terrain include...

10.3402/tellusa.v68.31820 article EN cc-by Tellus A Dynamic Meteorology and Oceanography 2016-08-19

Abstract. In recent decades, extremely hazardous windstorms have caused enormous losses to buildings, infrastructure and forests in Switzerland. This has increased societal scientific interest the intensity frequency of historical high-impact storms. However, high-resolution wind data damage statistics mostly span decades only. For this study, we collected quantitative (e.g., volumes windfall timber, relating buildings) descriptive forestry or insurance reports) information on impact...

10.5194/nhess-14-2867-2014 article EN cc-by Natural hazards and earth system sciences 2014-11-04

"Dynamical Downscaling and Loss Modeling for the Reconstruction of Historical Weather Extremes Their Impacts: A Severe Foehn Storm in 1925" published on Aug 2015 by American Meteorological Society.

10.1175/bams-d-14-00041.1 article EN other-oa Bulletin of the American Meteorological Society 2015-02-03

Abstract The link between high precipitation in Dronning Maud Land (DML), Antarctica, and the large‐scale atmospheric circulation is investigated using ERA‐Interim data for 1979–2009. High‐precipitation events are analyzed at Halvfarryggen situated coastal region of DML Kohnen Station located its interior. This study further includes a comprehensive comparison with from Antarctic Mesoscale Prediction System (AMPS) snow accumulation measurements automatic weather stations (AWSs), limitations...

10.1002/2014jd022259 article EN Journal of Geophysical Research Atmospheres 2014-10-08

This study investigates the wind gusts and associated economic loss patterns of high-impact winter windstorms in Switzerland between 1871 2011. A novel approach for simulating windstorm-related losses at regional to local scales is applied a sample 84 windstorms. The involves dynamical downscaling Twentieth Century Reanalysis (20CR) ensemble mean 3-km horizontal grid size using Weather Research Forecasting (WRF) model. Economic are simulated municipal level present-day asset distribution...

10.3402/tellusa.v68.29546 article EN cc-by Tellus A Dynamic Meteorology and Oceanography 2016-03-30

Abstract. With access to claims, insurers have a long tradition of being knowledge leaders on damages caused by windstorms. However, new opportunities arisen better assess the risks winter windstorms in Europe through availability historic footprints provided Windstorm Information Service (Copernicus WISC). In this study, we compare how modelling building complements claims-based risk assessment. We describe and use two windstorm models: an insurer's proprietary model open source CLIMADA...

10.5194/nhess-21-279-2021 article EN cc-by Natural hazards and earth system sciences 2021-01-25

Abstract. The western North Pacific (WNP) is the area of world most frequently affected by tropical cyclones (TCs). However, little known about socio-economic impacts TCs in this region, probably because limited relevant loss data. Here, data from Munich RE's NatCatSERVICE database used, a high-quality and widely consulted natural disasters. In country-level normalisation technique we apply, original are normalised to present-day exposure levels using respective country's nominal gross...

10.5194/nhess-13-115-2013 article EN cc-by Natural hazards and earth system sciences 2013-01-24

The decadal-scale variability in winter hazardous winds northern Switzerland from 1871 to present is investigated the Twentieth Century Reanalysis (20CR). Independent wind speed measurements taken at Zurich climate station show that interannual and decadal realistically represented 20CR. Both time series exhibit pronounced with periods between approximately 36 47 years. At these periodicities, positively correlated North Atlantic Oscillation, however strength statistical significance of...

10.1002/asl2.467 article EN other-oa Atmospheric Science Letters 2013-10-17

Abstract. With access to claims, insurers have a long tradition of being knowledge leaders on damages caused by e.g. windstorms. However, new opportunities arisen better assess the risks winter windstorms in Europe through availability historic footprints provided Windstorm Information Service (Copernicus WISC). In this study, we compare how modelling building complements claims-based risk assessment. We describe and use two windstorm models: insurer's proprietary model open source CLIMADA...

10.5194/nhess-2020-115 preprint EN cc-by 2020-04-23

Abstract. In recent decades, extremely hazardous windstorms have caused unanticipated losses to buildings, infrastructure and forests in Switzerland. This has increased societal scientific interest the intensity frequency of historical high-impact storms. However, high-resolution wind data damage statistics mostly span decades only. For this study, we collected quantitative (e.g., volumes windfall timber, buildings) descriptive forestry or insurance reports) information on impacts from...

10.5194/nhessd-2-3821-2014 preprint EN cc-by 2014-05-28

<p>We compare the risk assessment for storm related building damage based on three different foundations: (1) insurance claims data, (2) modelled damages a historic event set of wind gust and (3) probabilistic extension set. Windstorms cause large socio-economic in Europe. In canton Zurich (Switzerland) they are responsible one third caused by natural hazards.</p><p>The Wind Storm Information Service (WISC) Copernicus Climate Change provides open...

10.5194/egusphere-egu2020-17644 article EN 2020-03-10
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