A5071841291- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Wind Energy Research and Development
- Spectroscopy and Laser Applications
- Blood disorders and treatments
- Immunodeficiency and Autoimmune Disorders
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Geophysics and Gravity Measurements
- Wind and Air Flow Studies
- Erythrocyte Function and Pathophysiology
- Island Studies and Pacific Affairs
- Radioactive contamination and transfer
- Nuclear Issues and Defense
- bioluminescence and chemiluminescence research
- African Botany and Ecology Studies
- Solar Radiation and Photovoltaics
- Calibration and Measurement Techniques
- Ocean Waves and Remote Sensing
- Seismology and Earthquake Studies
Federal Office of Meteorology and Climatology MeteoSwiss
2018-2023
University of Bern
1988-2019
Leibniz Institute of Atmospheric Physics at the Rostock University
2017-2018
Czech Academy of Sciences, Institute of Atmospheric Physics
2016
Institute of Applied Physics
2016
Abstract High‐resolution, ground‐based and independent observations including co‐located wind radiometer, lidar stations, infrasound instruments are used to evaluate the accuracy of general circulation models data‐constrained assimilation systems in middle atmosphere at northern hemisphere midlatitudes. Systematic comparisons between observations, European Centre for Medium‐Range Weather Forecasts (ECMWF) operational analyses recent Integrated Forecast System cycles 38r1 38r2, NASA's...
This paper reviews recent progress toward understanding the dynamics of middle atmosphere in framework Atmospheric Dynamics Research InfraStructure Europe (ARISE) initiative. The atmosphere, integrating stratosphere and mesosphere, is a crucial region which influences tropospheric weather climate. Enhancing requires improved measurement propagation breaking planetary gravity waves originating lowest levels atmosphere. Inter-comparison studies have shown large discrepancies between...
Abstract. We report on the wind radiometer WIRA, a new ground-based microwave Doppler-spectro-radiometer specifically designed for measurement of middle-atmospheric horizontal by observing ozone emission spectra at 142.17504 GHz. Currently, speeds in five levels between 30 and 79 km can be retrieved which makes WIRA first instrument able to continuously measure this altitude range. For an integration time one day error each level lies around 25 m s−1. With planned upgrade value is expected...
Abstract. WIRA is a ground-based microwave Doppler spectroradiometer specifically designed for the measurement of profiles horizontal wind in upper stratosphere and lower mesosphere region where no other continuously running technique exists. A proof principle has been delivered previous publication. technical upgrade including new high-frequency amplifier sideband filter improved signal to noise ratio by factor 2.4. Since this full field comprising zonal meridional measured. completely...
Abstract. Wind profile information throughout the entire upper stratosphere and lower mesosphere (USLM) is important for understanding of atmospheric dynamics but became available only recently, thanks to developments in remote sensing techniques modelling approaches. However, as wind measurements from these altitudes are rare, such products have generally not yet been validated with (other) observations. This paper presents first long-term intercomparison observations USLM by co-located...
The first operations at the new High-altitude Maïdo Observatory La Réunion began in 2013. Lidar Calibration Campaign (MALICCA) was organized there April 2013 and has focused on validation of thermodynamic parameters (temperature, water vapor, wind) measured with many instruments including very large lidar for vapor temperature profiles. aim this publication consists providing an overview different deployed during campaign their status, some targeted scientific questions associated...
Abstract. The purpose of the EUNADICS-AV (European Natural Airborne Disaster Information and Coordination System for Aviation) prototype early warning system (EWS) is to develop combined use harmonised data products from satellite, ground-based in situ instruments produce alerts airborne hazards (volcanic, dust, smoke radionuclide clouds), satisfying requirement aviation air traffic management (ATM) stakeholders (https://cordis.europa.eu/project/id/723986, last access: 5 November 2021)....
E-Profile is the EUMETNET Programme coordinating measurements of vertical profiles wind, aerosols and clouds from radars lidars in Europe. The wind network provides near real-time weather dedicated profilers with main goal to promote usability these data for operational meteorology provide expertise both provider end-user.Ground-based scanning Doppler Wind Lidars (DWLs) are capable measuring atmospheric boundary layer (ABL) at a high spatial temporal resolution they have potential improve...
Abstract. Ground-based microwave wind radiometry provides a method to measure horizontal speeds at altitudes between 35 and 75 km as has been shown by various previous studies. No other is capable of continuously delivering measurements in this altitude region. As opposed lidar systems, radiometers operate autonomously independent daylight clouds.In paper, we present the WIRA-C (Wind Radiometer for Campaigns) instrument that observes 142.17504 GHz rotational transition line ozone with high...
Abstract. Reliable ozone trends after 2000 are essential to detect early recovery. However, the long-term ground-based and satellite profile reported in literature show a high variability. There multiple reasons for variability such as measurement timing dataset quality. The Payerne Switzerland microwave radiometer (MWR) significantly positive at 2 % 3 per decade upper stratosphere (5–1 hPa, 35–48 km), with variation altitude. This is accordance Northern Hemisphere (NH) by other instruments...
Abstract. Ozone performs a key role in the middle atmosphere and its monitoring is thus necessary.At Institute of Applied Physics University Bern, Switzerland, we built new ground-based microwave radiometer, GROMOS-C (GRound based MOnitoring System for Campaigns). It has compact design can be operated remotely with very little maintenance requirements, being therefore suitable remote deployments. been conceived to measure vertical distribution ozone atmosphere, by observing...
Abstract. Direct measurements of middle-atmospheric wind oscillations with periods between 5 and 50 days in the altitude range mid-stratosphere (5 hPa) upper mesosphere (0.02 have been made using a novel ground-based Doppler radiometer. The were not inferred from tracer measurements, as radiometer offers unique capability near-continuous horizontal profile measurements. Observations four campaigns at high, middle low latitudes an average duration 10 months analyzed. dominant oscillation has...
Abstract. We used 3 years of water vapour and ozone measurements to study the dynamics in Arctic middle atmosphere. investigated descent within polar vortex, major minor sudden stratospheric warmings periodicities at Ny-Ålesund. The were performed with two ground-based microwave radiometers MIAWARA-C GROMOS-C, which have been co-located AWIPEV research base Ny-Ålesund, Svalbard (79∘ N, 12∘ E), since September 2015. Both instruments belong Network for Detection Atmospheric Composition Change...
Abstract. We report on the wind radiometer WIRA, a new ground-based microwave Doppler-spectro-radiometer specifically designed for measurement of middle-atmospheric horizontal by observing ozone emission spectra at 142.17504 GHz. Currently, speeds in five levels between 30 and 79 km can be retrieved what makes WIRA first instrument able to continuously measure this altitude range. For an integration time one day error each level lies around 25 m s−1. With planned upgrade value is expected...
Abstract. Observations of oscillations in the abundance middle-atmospheric trace gases can provide insight into dynamics middle atmosphere. Long-term, high-temporal-resolution and continuous measurements dynamical tracers within strato- mesosphere are rare but would facilitate better understanding impact atmospheric waves on Here we report water vapor from ground-based microwave radiometer MIAWARA (MIddle Atmospheric WAter RAdiometer) located close to Bern during two winter periods 6 months...
Abstract. Wind profile information throughout the upper stratosphere and lower mesosphere (USLM) is important for understanding of atmospheric dynamics but became available only recently, thanks to developments in remote sensing techniques modelling approaches. However, as wind measurements from these altitudes are still very rare, such products have generally not yet been validated with (other) observations. This paper presents first long-term intercomparison observations USLM by opposing...
Abstract. Observations of oscillations in the abundance middle atmospheric trace gases can provide insight into dynamics atmosphere. Long term, high temporal resolution and continuous measurements dynamical tracers within strato- mesosphere are rare, but would be important to better understand impact planetary gravity waves on Here we report water vapor from ground-based microwave radiometer MIAWARA located close Bern during two winter periods 6 months October March. Oscillations with...
Abstract. We use 3 years of water vapour and ozone measurements to analyse dynamical events in the polar middle atmosphere such as sudden stratospheric warmings (SSW), vortex shifts, descent rates periodicities. The were performed with two ground-based microwave radiometers MIAWARA-C GROMOS-C which are co-located at AWIPEV research base Ny-Ålesund, Svalbard (79° N, 12° E) since September 2015. almost continuous datasets characterised by a high time resolution order hours. A thorough...
Abstract. WIRA is a ground-based microwave Doppler spectro radiometer specifically designed for the measurement of profiles horizontal wind in upper stratosphere and lower mesosphere region where no other continuously running technique exists. A proof principle has been delivered previous publication. Since technical upgrade which improved signal to noise ratio by factor 2.4 full field comprising zonal meridional measured. completely new retrieval based on optimal estimation set up. Its...
Abstract. Ground-based microwave wind radiometry provides a method to measure horizontal speeds at altitudes between 35 and 75 km as it has been shown by various previous studies. No other is capable of continuously delivering measurements in this altitude region. In paper, we present the WIRA-C (WInd Radiometer for Campaigns) instrument that observes 142.17504 GHz rotational transition line ozone with high spectral resolution using low noise single side band heterodyne receiver. Because...