Florian Ewald
A5033429605- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Cryospheric studies and observations
- Precipitation Measurement and Analysis
- Atmospheric Ozone and Climate
- Icing and De-icing Technologies
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- Blood groups and transfusion
- Arctic and Antarctic ice dynamics
- Trauma and Emergency Care Studies
- Case Reports on Hematomas
- Fire effects on ecosystems
- Climate variability and models
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Glycosylation and Glycoproteins Research
- Diabetes and associated disorders
- Ionosphere and magnetosphere dynamics
- Pancreatic and Hepatic Oncology Research
- Satellite Image Processing and Photogrammetry
- Remote Sensing in Agriculture
- Cancer, Hypoxia, and Metabolism
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2013-2024
Czech Academy of Sciences, Institute of Atmospheric Physics
2020
NSF National Center for Atmospheric Research
2020
Northwest Research Associates
2020
Ludwig-Maximilians-Universität München
2013-2019
Abstract The North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) explored the impact of diabatic processes on disturbances jet stream their influence downstream high-impact weather through deployment four research aircraft, each with a sophisticated set remote sensing in situ instruments, coordinated suite ground-based measurements. A total 49 flights were performed, including, for first time, aircraft: German High Altitude Long Range Research Aircraft (HALO), Deutsches...
Abstract. The science guiding the EUREC4A campaign and its measurements is presented. comprised roughly 5 weeks of in downstream winter trades North Atlantic – eastward southeastward Barbados. Through ability to characterize processes operating across a wide range scales, marked turning point our observationally study factors influencing clouds trades, how they will respond warming, their link other components earth system, such as upper-ocean or life cycle particulate matter. This...
Abstract Between 1 September and 4 October 2014, a combined airborne ground-based measurement campaign was conducted to study tropical deep convective clouds over the Brazilian Amazon rain forest. The new German research aircraft, High Altitude Long Range Research Aircraft (HALO), modified Gulfstream G550, extensive instrumentation were deployed in near Manaus (State of Amazonas). part German–Brazilian Aerosol, Cloud, Precipitation, Radiation Interactions Dynamics Convective Cloud...
Abstract A configuration of the High-Altitude Long-Range Research Aircraft (HALO) as a remote sensing cloud observatory is described, and its use illustrated with results from first second Next-Generation Remote Sensing for Validation (NARVAL) field studies. Measurements NARVAL (NARVAL2) are used to highlight ability HALO, when configured in this fashion, characterize not only distribution water condensate atmosphere, but also impact on radiant energy transfer covarying large-scale...
Abstract. Aerosols that are efficient ice-nucleating particles (INPs) crucial for the formation of cloud ice via heterogeneous nucleation in atmosphere. The distribution INPs on a large spatial scale and as function height determines their impact clouds climate. However, situ measurements provide sparse coverage over space time. A promising approach to address this gap is retrieve INP concentration profiles by combining particle derived lidar with efficiency parameterizations different...
Abstract. As part of the EUREC4A (Elucidating role cloud–circulation coupling in climate) field campaign, German research aircraft HALO (High Altitude and Long Range Research Aircraft), configured as a cloud observatory, conducted 15 flights trade-wind region east Barbados January February 2020. Narrative text, state data, metadata describing HALO's operation during campaign are provided. Each flight is segmented by timestamp intervals into standard elements to aid consistent analysis data....
Abstract. The new spectrometer of the Munich Aerosol Cloud Scanner (specMACS) is a multipurpose hyperspectral cloud and sky imager designated, but not limited to investigations cloud–aerosol interactions in Earth's atmosphere. With its high spectral spatial resolution, instrument designed measure solar radiation visible shortwave infrared region that reflected from, or transmitted through clouds aerosol layers. It based on two cameras range between 400 2500 nm with bandwidth 2.5 12.0 nm. was...
Abstract. Vertical profiles of the cloud particle phase state in tropical deep-convective clouds (DCCs) were investigated using airborne solar radiation data collected by German research aircraft HALO during ACRIDICON-CHUVA campaign, which was conducted over Brazilian Amazon September 2014. A discrimination retrieval based on imaging spec-troradiometer measurements side spectral reflectivity applied to DCCs under different aerosol conditions. From results height mixed layer determined. The...
Abstract. This study gives a summary of lessons learned during the absolute calibration airborne, high-power Ka-band cloud radar HAMP MIRA on board German research aircraft HALO. The first part covers internal instrument where individual components are characterized in laboratory. In second part, is validated with external reference sources like ocean surface backscatter and different air- spaceborne instruments. A key component this work was characterization spectral response transfer...
Abstract. Global warming is amplified in the Arctic. However, numerical models struggle to represent key processes that determine Arctic weather and climate. To collect data help constrain models, HALO–(𝒜𝒞)3 aircraft campaign was conducted over Norwegian Greenland seas, Fram Strait, central Ocean March April 2022. The focused on one specific challenge posed by namely reasonable representation of transformations air masses during their meridional transport into out via northward moist-...
Abstract. Cloud and precipitation processes are still a main source of uncertainties in numerical weather prediction climate change projections. The Priority Programme “Polarimetric Radar Observations meet Atmospheric Modelling (PROM)”, funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG), is guided hypothesis that many relate to lack observations suitable challenge representation cloud atmospheric models. Such can, however, at present be provided recently...
Abstract. The global warming is amplified in the Arctic. To collect data that help to constrain weather and climate models, which often do not realistically represent enhanced Arctic warming, HALO-(AC)³ aircraft campaign was conducted March April 2022 over Norwegian Greenland Seas, Fram Strait, central Ocean. Observations were made areas of open ocean, marginal sea ice zone, ice. Two low-flying one long-range, high-altitude research have been employed. Whenever possible, three flown...
Cirrus clouds permit much of the incoming solar shortwave radiation to pass through while trapping and reemitting Earth's outgoing longwave thermal radiation. This results in a net warming effect globally at top atmosphere. They are found almost over every region, but their impact can differ depending on latitude. The arctic is unique fascinating area. Over last few decades, scientists have shown that its average temperature increasing an accelerated rate compared global warming. phenomenon...
In May 2024 the EarthCARE satellite mission was launched. For first time, combines a high spectral resolution lidar and cloud radar with doppler capability as key instruments on one single platform. addition, it is equipped multi imager broadband radiometer. This unique combination makes most complex to study aerosol, clouds, precipitation, radiation. To fully use these new advanced data for science applications, careful validation of measurements products required. We have implemented an...
Abstract. A beam-aware columnar vertical profile (BA-CVP) methodology that incorporates data of the national German operational radar network with aim augmenting vertically pointing cloud radars is introduced. The method uses polarimetric collected in plan position indicator (PPI) scans multiple and considers contributions each a manner. results are paired measurements located range compared to dedicated scanning height (RHI) for two different case studies. combination side-looking BA-CVP...
Clouds and convection play a key role in structuring atmospheric circulation determining the climate sensitivity. However, it is still not understood how clouds will respond to warming of atmosphere. This due an insufficient representation moist models. A better understanding coupling between water vapor, convection, cloud formation needed. Shallow marine shows largest frequency occurrence amongst clouds. But besides being uniform similar structure, they can occur different larger scale...
Abstract. The HALO–(𝒜𝒞)3 aircraft campaign was carried out in March and April 2022 over the Norwegian Greenland seas, Fram Strait, central Arctic Ocean. Three research – High Altitude Long Range Research Aircraft (HALO), Polar 5, 6 performed 54 partly coordinated flights on 23 flight days areas of open ocean, marginal sea ice zone (MIZ), ice. general objective to quantify evolution air mass properties during moist warm-air intrusions (WAIs) cold-air outbreaks (CAOs). To obtain a...
Abstract. Cloud properties and their environmental conditions were observed during four aircraft campaigns over the North Atlantic on 37 flights. The Halo Microwave Package (HAMP) was deployed German research HALO (High Altitude Long Range Research Aircraft) these campaigns. HAMP comprises microwave radiometers with 26 channels in frequency range between 20 183 GHz a 35 cloud radar. took place December 2013 October 2016 out of Barbados Iceland. Measured situations cover wide including dry...
Abstract Strong turbulence was encountered by the German High-Altitude Long-Range Research Aircraft (HALO) at flight level 430 (13.8 km) on 13 October 2016 above Iceland. In this event caused altitude changes of research aircraft about 50 m within a period approximately 15 s. Additionally, automatic thrust control HALO could not large gradients in horizontal wind speed and, consequently, pilot had to switch off system. Simultaneously, French Falcon Service des Avions Français Instrumentés...
Abstract. Ice clouds and their effect on earth's radiation budget are one of the largest sources uncertainty in climate change predictions. The predicting ice cloud feedbacks a warming arises due to uncertainties measuring explaining current optical microphysical properties as well from insufficient knowledge about spatial temporal distribution. This can be significantly improved by active remote sensing, which help explore vertical profile microphysics, such particle size water content....
Abstract. Accurate measurements of ice hydrometeors are required to improve the representation clouds and precipitation in weather climate models. In this study, a newly developed, synergistic retrieval algorithm that combines radar with passive millimeter sub-millimeter observations is applied three frontally generated, mid-latitude cloud systems order validate assess its capabilities constrain properties hydrometeors. To account for uncertainty assumed shapes particles, run multiple times...
Abstract. In this study, a substantially improved version of the Meteosat cirrus detection algorithm (MeCiDA2) will be presented, which now allows application to full earth disc visible by satellite. As clouds have an influence on radiation budget earth, their optical properties and global coverage has monitored at scale using instruments aboard geostationary satellites. Since MeCiDA was optimised for area Europe only, various changes were necessary handle variable conditions found over...
Abstract. The science guiding the EUREC4A campaign and its measurements are presented. comprised roughly five weeks of in downstream winter trades North Atlantic – eastward south-eastward Barbados. Through ability to characterize processes operating across a wide range scales, marked turning point our observationally study factors influencing clouds trades, how they will respond warming, their link other components earth system, such as upper-ocean or, or life-cycle particulate matter. This...
Abstract. The HALO–(AC)3 aircraft campaign was carried out in March and April 2022 over the Norwegian Greenland Seas, Fram Strait, central Arctic Ocean. Three research aircraft, High Altitude Long Range Research Aircraft (HALO), Polar 5, 6, performed 54 partly coordinated flights on 23 flight days areas of open ocean, marginal sea ice zone (MIZ), ice. general objective to quantify evolution air mass properties during moist warm intrusions (WAIs) cold outbreaks (CAOs). To gain a comprehensive...
Abstract. Clouds are one of the main reasons uncertainties in forecasts weather and climate. In part, this is due to limitations remote sensing cloud microphysics. Present approaches often use passive spectral measurements for microphysical parameters. Large introduced by three-dimensional (3-D) radiative transfer effects inhomogeneities. Such largely caused unknown orientation sides or shadowed areas on cloud. Passive ground-based properties at high spatial resolution could be crucially...