A5041845761- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Solar Radiation and Photovoltaics
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Coastal and Marine Management
- Aeolian processes and effects
- Urban Heat Island Mitigation
- Climate variability and models
- Climate change and permafrost
- Ionosphere and magnetosphere dynamics
- Polar Research and Ecology
- Infrastructure Resilience and Vulnerability Analysis
- Risk and Safety Analysis
- Planetary Science and Exploration
- Oil Spill Detection and Mitigation
- Disaster Management and Resilience
- Astro and Planetary Science
- Island Studies and Pacific Affairs
- Species Distribution and Climate Change
- Science and Climate Studies
- Solar and Space Plasma Dynamics
Federal Office of Meteorology and Climatology MeteoSwiss
2017-2024
Zürich Airport (Switzerland)
2017-2019
Bolin Centre for Climate Research
2015-2018
Stockholm University
2015-2018
Oeschger Centre for Climate Change Research
2013
École Polytechnique Fédérale de Lausanne
2008-2012
ETH Zurich
2009-2012
Université d'Orléans
2006-2009
Centre National de la Recherche Scientifique
2006-2009
[1] The processes driving current changes in Arctic atmospheric composition and climate are still uncertain. In particular the relative contributions of major source regions from midlatitudes remain a matter debate literature. objectives this study to better quantify different governing transport pollution geopolitical regions. We use suite observational data sets (including Research Composition Troposphere Aircraft Satellites (ARCTAS) campaigns Cloud-Aerosol Lidar with Orthogonal...
Abstract. Mineral dust from arid areas is a major component of global aerosol and has strong interactions with climate biogeochemistry. As part the Chemistry-Aerosol Mediterranean Experiment (ChArMEx) to investigate atmospheric chemistry its impacts in region, an intensive field campaign was performed mid-June early August 2013 western basin including situ balloon-borne measurements light optical counter (LOAC). LOAC counter/sizer that provides concentrations 19 size classes between 0.2 100...
Abstract Six years (2007–2012) of data from the Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) satellite instrument were used to investigate vertical distribution and transport aerosols over tropical South American continent southeast Pacific Ocean. The multiyear aerosol extinction assessment indicates that aerosols, mainly biomass burning particles emitted during dry season in Amazon Basin, are lifted significant amounts Andes. transported planetary boundary layer between surface...
Stratospheric aerosols play a significant role in stratospheric chemistry. In the past, it was assumed that only liquid droplets are present stratosphere. Nevertheless, few lidar measurements have shown sudden enhancement of aerosol content middle stratosphere could be due to meteoritic debris. Aircraft solid particles can found lower stratosphere; these mainly soot, but also include some interplanetary material. order better document various characteristics unperturbed (i.e., free volcanic...
Abstract. The global aerosol extinction from the CALIOP space lidar was used to compute optical depth (AOD) over a 9-year period (2007–2015) and partitioned between boundary layer (BL) free troposphere (FT) using BL heights obtained ERA-Interim archive. results show that vertical distribution of AOD does not follow diurnal cycle but remains similar day night highlighting presence residual during night. FT contribute 69 31 %, respectively, tropospheric daytime in line with observations Aire...
Abstract. The major volcanic eruption of Mount Pinatubo in 1991 has been shown to have significant effects on stratospheric chemistry and ozone depletion even at midlatitudes. Since then, only moderate but recurrent eruptions modulated the aerosol loading are assumed be one cause for reported increase global content over past 15 years. This particularly enhanced context raises questions about which depend latitude, altitude season injection. In this study, we focus midlatitude Sarychev...
Abstract. Aerosols from the Sarychev volcano eruption (Kuril Islands, northeast of Japan) were observed in Arctic lower stratosphere a few days after strongest SO2 injection which occurred on 15 and 16 June 2009. From observations provided by Infrared Atmospheric Sounding Interferometer (IASI) an estimated 0.9 Tg sulphur dioxide was injected into upper troposphere (UTLS). The resultant stratospheric sulphate aerosols detected satellites Optical Spectrograph Imaging System (OSIRIS) limb...
Clouds are crucial for Earth's climate and radiation budget. Great attention has been paid to low, high vertically thick tropospheric clouds such as stratus, cirrus deep convective clouds. However, much less is known about mid-level these challenging observe in situ difficult detect by remote sensing techniques. Here we use Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) satellite observations show that thin (TMLCs) ubiquitous the tropics. Supported high-resolution regional model...
Can we build stable Climate Data Records (CDRs) spanning several satellite generations? This study outlines how the ClOud Fractional Cover dataset from METeosat First and Second Generation (COMET) of EUMETSAT Satellite Application Facility on Monitoring (CM SAF) was created for 25-year period 1991–2015. Modern multi-spectral cloud detection algorithms cannot be used historical Geostationary (GEO) sensors due to their limited spectral resolution. We document innovation needed create a...
Abstract Surface solar radiation is fundamental for terrestrial life. It provides warmth to make our planet habitable, drives atmospheric circulation, the hydrological cycle and photosynthesis. Europe has experienced an increase in surface radiation, termed “brightening,” since 1980s. This study investigates causative factors behind this brightening. A novel algorithm from EUMETSAT satellite application facility on climate monitoring (CM SAF) unique opportunity simulate under various...
Large increase in stratospheric NO 2 content has been observed during the 2003–2004 Arctic winter. The first one, early November 2003 is well documented and due to a strong solar protons event. A second event occurred on January 22, 2004, leading large amount of lower mesosphere. This can be analyzed using data from nighttime satellite measurements performed by GOMOS MIPAS instruments onboard Envisat, ground based column SAOZ. It seems that in‐situ production located at an altitude around 60...
Nighttime remote‐sensing balloon observations conducted by the SALOMON instrument in arctic polar vortex January 2006 reveal high amounts of stratospheric NO 2 lower stratosphere similarly to previously published profiles. concentration enhancements are also present vertical profiles observed GOMOS on board Envisat satellite and obtained coincidently measurements. Such quantities not situ SPIRALE similar geophysical conditions. While OClO acceptably reproduced Chemistry Transport Model (CTM)...
Abstract Grid datasets of sunshine duration at high spatial resolution and extending over many decades are required for quantitative applications in regional climatology environmental change (e.g., modelling droughts snow/ice covers, evaluation clouds numerical models, mapping solar energy potentials). We present a new gridded dataset relative (and derived absolute) Austria grid spacing 1 km, back until 1961 daily time resolution. Challenges the construction were consistency issues available...
Abstract. We use observations from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) satellite instrument and a global aerosol-climate model to document an aerosol layer that forms in vicinity of tropical tropopause (TTL) over Southern Asian Indian Ocean region. CALIOP suggest is present throughout year follows migration Intertropical Convergence Zone (ITCZ). The located at about 20° N during boreal summers 15° S winters. ECHAM5.5-HAM2 reproduces such close TTL but overestimates...
Abstract. The global aerosol extinction from the CALIOP space lidar was used to compute optical depth (AOD) over a nine-year period (2007–2015) and partitioned between boundary layer (BL) free troposphere (FT) using BL heights obtained ERA-Interim archive. results show that vertical distribution of AOD does not follow diurnal cycle but remains similar day night highlighting presence residual during night. FT contribute 69 % 31 %, respectively, tropospheric daytime in line with observations...
Abstract. Mineral dust from arid areas is a major component of the global aerosol and has strong interactions with climate biogeochemistry. As part Chemistry-Aerosol Mediterranean Experiment (ChArMEx) to investigate atmospheric chemistry its impacts in region, an intensive field campaign was performed mid-June early August 2013 western basin including situ balloon-borne measurements Light Optical Aerosol Counter (LOAC). LOAC counter/sizer that provides concentrations 19 size classes between...
Surface solar radiation is fundamental for terrestrial life. It provides warmth to make our planet habitable, drives atmospheric circulation, the hydrological cycle and photosynthesis. Europe has experienced an increase in surface radiation, termed “brightening”, since 1980s. This study investigates causative factors behind this brightening. A novel algorithm from EUMETSAT satellite application facility on climate monitoring (CM SAF) unique opportunity simulate under various conditions...
Anomalously enhanced NO 2 concentrations are sometimes observed in the polar winter upper atmosphere. The enhancements over Antarctica from May to August 2003 were probably due auroral electron precipitation, producing high amounts of mesosphere that converted during downward transport stratosphere. Another enhancement was detected Arctic middle stratosphere October–November 2003, this time energetic solar proton precipitation. This quickly followed by a new produced electrons November 2003....
In recent years, it has become more and clear that climate change its impacts do severely affect companies’ business. For example, acute risks driven by e.g. floods tropical cyclones can impact physical assets halt productions, whereas chronic such as droughts temperature increases have severe on crop production, labour productivity water availability. This increased understanding of risk performances led to the establishment Task Force Climate-related Financial Disclosure (TCFD)...
Abstract. The major volcanic eruption of Mount Pinatubo in 1991 has been shown to have significant effects on stratospheric chemistry and ozone depletion even at mid-latitudes. Since then, only "moderate" but recurrent eruptions modulated the aerosol loading such as mid-latitude Sarychev volcano which injected 0.9 Tg sulfur dioxide (about 20 times less than Pinatubo) June 2009. In this study, we investigate chemical impacts enhanced liquid sulfate resulting from moderate using data a balloon...
Abstract. Aerosols from the Sarychev volcano eruption (Kuril Islands, northeast of Japan) were observed in Arctic lower stratosphere a few days after strongest SO2 injection which occurred on 15 and 16 June 2009. From observations provided by Infrared Atmospheric Sounding Interferometer (IASI) an estimated 0.9 Tg sulphur dioxide was injected into Upper Troposphere Lower Stratosphere (UTLS). The resultant stratospheric sulphate aerosols detected Optical Spectrograph Imaging System (OSIRIS)...