Laurent Vuilleumier is a senior scientist at the Swiss Federal Office of Meteorology and Climatology (MeteoSwiss). He is a specialist of precision ground surface radiation monitoring for climate change research. He is responsible for MeteoSwiss activities within the Baseline Surface Radiation Network (BSRN) and, for UV radiation, within the Global Atmosphere Watch (GAW). Laurent Vuilleumier studied physics at EPFL, the Swiss Federal Institute of Technology in Lausanne. In 1994, he obtained his PhD in high energy physics within the L3 collaboration at CERN. Between 1995 and 2001 he worked at the US DoE Lawrence Berkeley National Laboratory in the Environmental Energy Technologies division where he conducted research in the domain of air quality modelling focusing on summer smog in cities. In this framework, he researched how uncertainty should be accounted in air quality models and how it affects the reliability of the model predictions. Since end of 2001, Laurent Vuilleumier works at MeteoSwiss as responsible of the Swiss Alpine Climate Radiation Monitoring network and is the BSRN site scientist. He directed, or collaborated to, studies of aerosol and cloud effects on radiation, cloud detections studies and trend analysis for solar and terrestrial radiation time series as well as aerosol optical depth. Laurent Vuilleumier also participated in European collaborations aiming at improving forecasts of solar radiation for the renewable energy sector. At the Swiss national level, he participated in multidisciplinary studies for assessing UV radiation doses on humans and their impact on public health. Since 2013, he is member of the Advisory Commission of the PMOD/WRC whose Word Radiation Centre is in charge of maintaining the primary references for solar and terrestrial radiation. Since 2018, he is the chair of the WMO Expert Team on Radiation References (ET-RR) whose task is assessing the current status of the solar and terrestrial radiation references and address implications of proposed changes to those references.
