A5063314874- Ionosphere and magnetosphere dynamics
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Seismic Waves and Analysis
- Planetary Science and Exploration
- Spaceflight effects on biology
- Atmospheric aerosols and clouds
- Astro and Planetary Science
- Atmospheric and Environmental Gas Dynamics
- Earthquake Detection and Analysis
- Spacecraft Design and Technology
- Ocean Waves and Remote Sensing
- GNSS positioning and interference
- Geophysics and Sensor Technology
- Space Science and Extraterrestrial Life
- thermodynamics and calorimetric analyses
- Renal cell carcinoma treatment
- Remote Sensing and LiDAR Applications
- Sesame and Sesamin Research
- Drilling and Well Engineering
- Innovations in Concrete and Construction Materials
- Seismology and Earthquake Studies
- Ecology and Conservation Studies
- Religion, Spirituality, and Psychology
Ludwig-Maximilians-Universität München
2021-2025
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2019-2024
Technische Universität Ilmenau
2023
Czech Academy of Sciences, Institute of Atmospheric Physics
2021-2022
Queen's Medical Centre
2022
John Wiley & Sons (United States)
2017
Ecological Society of America
2017
California Institute of Technology
1997
Jet Propulsion Laboratory
1978-1995
Abstract The southern part of South America and the Antarctic peninsula are known as world’s strongest hotspot region stratospheric gravity wave (GW) activity. Large tropospheric winds deflected by Andes Peninsula excite GWs that might propagate into upper mesosphere. Satellite observations show large GW activity above mountains, Drake Passage, in a belt centered along 60°S. This scientifically highly interesting for studying dynamics was focus Southern Hemisphere Transport, Dynamics,...
Abstract Gravity waves (GWs) are among the key drivers of meridional overturning circulation in mesosphere and upper stratosphere. Their representation climate models suffers from insufficient resolution limited observational constraints on their parameterizations. This obscures assessments middle atmospheric changes a changing climate. study presents comprehensive analysis stratospheric GW activity above downstream Andes 1 to 15 August 2019, with special focus ranging an unprecedented...
Abstract. This paper describes the Python package JuWavelet, which implements continuous wavelet transform using Morlet wavelet, is a popular tool in Geosciences to analyse wave-like phenomena. It closes gap available software, are typically focused on discrete transforms or lower dimensions than offered here. The code 1-D, 2-D, and 3-D. In particular, not only analysis, but also synthesis from (modified) decomposition available. provides consistent implementation for both original...
On the night of 21/22 May 2018, clear-sky conditions enabled a 12-hour-long temperature measurement Advanced Mesospheric Temperature Mapper (AMTM) in mesosphere-lower thermosphere (MLT) region over Río Grande, Argentina. Given westerly forcing Patagonia, we observe North-South-oriented phase lines AMTM maps exclusively during semi-diurnal tide, indicating deep propagation mountain waves (MWs) with horizontal wavelengths between 20 km and 40 km. After wind reversal MLT, two...
Abstract The Southern Andes are the strongest hot spot for atmospheric gravity waves (GWs) in stratosphere. Yet, until recently, no high‐cadence measurements of GWs within middle atmosphere were available this region. Therefore, COmpact Rayleigh Autonomous Lidar (CORAL) was deployed to Estación Astrónomica Río Grande (53.7°S, 67.7°W), Argentina, obtain temperature profiles up 100 km altitude. CORAL operates autonomously and obtained during roughly two thirds all nights between November 2017...
During the last 2 weeks of February 1977, an intensive scientific investigation martian satellite Phobos was conducted by Viking Orbiter-1 (VO-1) spacecraft. More than 125 television pictures were obtained during this period and infrared observations made. About 80 percent illuminated hemisphere imaged at a resolution about 30 meters. Higher images limited areas also obtained. Flyby distances within kilometers surface achieved. An estimate mass (GM) observing effect Phobos's gravity on orbit...
Abstract Long‐term high‐resolution temperature data of the Compact Rayleigh Autonomous Lidar (CORAL) is used to evaluate and gravity wave (GW) activity in ECMWF Integrated Forecasting System (IFS) over Río Grande (53.79°S, 67.75°W), which a hot spot stratospheric GWs winter. Seasonal altitudinal variations differences between IFS lidar are studied for 2018 with uniform version. Moreover, interannual considered taking into account updated versions. We find monthly mean <2 K at 20–40 km...
Abstract. We analyse gravity waves in the upper-mesosphere, lower-thermosphere region from high-resolution temperature variations measured by Rayleigh lidar and OH mapper. From this combination of instruments, aided meteor radar wind data, full set ground-relative intrinsic wave parameters are derived means novel WAPITI (Wavelet Analysis Phase line IdenTIfication) method. This tool decomposes field into its spectral component while preserving temporal resolution, allowing us to identify...
Abstract. Continuous wavelet transform (CWT) is a commonly used mathematical tool when it comes to the time–frequency (or distance–wavenumber) analysis of non-stationary signals that in variety research areas. In this work, we use CWT investigate signatures atmospheric internal gravity waves (GWs) as observed vertical temperature profiles obtained, for instance, by lidar. The focus laid on determination wavelengths dominant GWs. According linear GW theory, these are function horizontal wind...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Atmospheres. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v2]Gravity-Wave-Driven Seasonal Variability Temperature Differences between ECMWF IFS Rayleigh Lidar Measurements Lee Southern...
The Aeolus mission, launched by the European Space Agency in August 2018, was a landmark Earth observation providing global wind profiles near-real time using first Doppler lidar space: Atmospheric Laser Instrument (ALADIN). Despite challenges such as systematic errors affecting data quality at beginning of surpassed its planned lifetime three years and proved invaluable for weather prediction scientific research until conclusion July 2023. A permanent challenge throughout mission involved...
Abstract. We analyze gravity waves in the mesosphere, lower thermosphere region from high-resolution temperature variation measured by Rayleigh lidar and OH mapper. From this combination of instruments, aided meteor radar wind data, full set ground-relative intrinsic wave parameters are derived means novel WAPITI method. This Wavelet Analysis Phase line IdenTIfication tool decomposes field into its spectral components while preserving temporal resolution, allowing us to identify study...
T he region of the southern Andes and Antarctic Peninsula is known as world's strongest stratospheric hotspot gravity wave (GW) activity, occurring during austral winter through early spring.Known sources GWs include flow over orography [GWs mountain waves (MWs)], convection, spontaneous emission.Large-scale tropospheric winds are deflected by Peninsula, excite that may propagate into upper mesosphere.Satellite observations show increased GW activity above mountains, Drake Passage, in a belt...
Abstract Ongoing developments in nanotechnology demand higher spatial resolution and thus, amplitude sensitivity Atomic Force Microscopy (AFM). In this work, active cantilevers with integrated sensor actuator systems are parametrically excited using a novel, analog feedback circuit. With that it is possible to adapt the strength sign of cubic nonlinearity which provides bound amplitudes resonance operation . The system response shows steeper curves therefore sensitivities compared forced...
Abstract. Continuous Wavelet Transform (CWT) is a commonly used mathematical tool when it comes to the time-frequency (or distance-wavenumber) analysis of non-stationary signals and in variety research areas. In this work we use CWT investigate signatures atmospheric internal gravity waves (GW) as observed vertical temperature profiles obtained for instance by lidar. The focus laid on determination wavelengths dominant GWs. According linear GW theory these are function horizontal wind speed...