A5048224483- Arctic and Antarctic ice dynamics
- Photorefractive and Nonlinear Optics
- Meteorological Phenomena and Simulations
- Climate variability and models
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Cryospheric studies and observations
- Acoustic Wave Resonator Technologies
- Photonic and Optical Devices
- Ferroelectric and Piezoelectric Materials
- Advanced Fiber Laser Technologies
- Multiferroics and related materials
- Geophysics and Gravity Measurements
- Electronic and Structural Properties of Oxides
- Tropical and Extratropical Cyclones Research
- Atmospheric Ozone and Climate
- Climate change and permafrost
- 2D Materials and Applications
- Ocean Acidification Effects and Responses
- Ionosphere and magnetosphere dynamics
- Glass properties and applications
- Spectroscopy and Quantum Chemical Studies
- Magneto-Optical Properties and Applications
- Microfluidic and Bio-sensing Technologies
Leipzig University
2022-2024
Technische Universität Dresden
2019-2024
Leibniz Institute for Solid State and Materials Research
2015
Distinct events of warm and moist air intrusions (WAIs) from mid-latitudes have pronounced impacts on the Arctic climate system. We present a detailed analysis record-breaking WAI observed during MOSAiC expedition in mid-April 2020. By combining Eulerian with Lagrangian frameworks using simulations across different scales, we investigate aspects mass transformations via cloud processes quantify related surface impacts. The is characterized by two distinct pathways, Siberian Atlantic. A...
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-...
Challenges in the fields of renewable energy harvesting, data storage, and nanoelectronics have resparked interest ferroelectric domain walls (DWs) as tunable, nanoscale elements. However, study such structures has mostly relied on 2-dimensional, rather slow imaging techniques scanning probe microscopy. Therefore, Cherenkov second harmonic generation (CSHG) microscopy been established a technique suitable for nondestructive DWs their 3-dimensional (3D) evolution. Here, we report real-time...
The tethered balloon-borne measurement system BELUGA (Balloon-bornE moduLar Utility for profilinG the lower Atmosphere) was deployed over Arctic sea ice 4 weeks in summer 2020 as part of Multidisciplinary drifting Observatory Study Climate expedition. Using BELUGA, vertical profiles dynamic, thermodynamic, aerosol particle, cloud, radiation, and turbulence properties were measured from ground up to a height 1,500 m. operated during an anomalously warm period with frequent liquid water clouds...
Abstract. How air masses transform during meridional transport into and out of the Arctic is not well represented by numerical models. The airborne field campaign HALO-(𝒜𝒞)3 applied High Altitude Long-range Research Aircraft (HALO) within framework collaborative research project on amplification (𝒜𝒞)3 to address this question providing a comprehensive observational basis. took place from 7 March 12 April 2022 in North Atlantic sector Arctic, main gateway atmospheric Arctic. Here, we...
During Arctic marine cold air outbreaks (MCAOs), and dry flows from the central southward over open ocean. There, cloud streets form that transform to cellular convection downstream under extreme surface heat fluxes. MCAOs strongly affect water cycle through large-scale mass transformations can lead weather conditions at mid-latitudes. The description of is still challenging partly because previous observations do not resolve fine scales lack information about microphysical properties....
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...
Abstract. Arctic air masses undergo intense transformations when moving southward from closed sea ice to warmer open waters in marine cold-air outbreaks (CAOs). Due the lack of measurements diabatic heating and moisture uptake rates along CAO flows, studies often depend on atmospheric reanalysis output. However, uncertainties connected those datasets remain unclear. Here, we present height-resolved airborne observations heating, uptake, cloud evolution measured a quasi-Lagrangian manner. The...
Nonlinear and quantum optical devices based on periodically-poled thin film lithium niobate (PP-TFLN) have gained considerable interest lately, due to their significantly improved performance as compared bulk counterparts. Nevertheless, parameters such conversion efficiency, minimum pump power, spectral bandwidth strongly depend the quality of domain structure in these PP-TFLN samples, e.g., homogeneity duty cycle, well overlap penetration depth domains with waveguide mode. Hence, order...
Abstract. The airborne field campaign HALO–(AC)³ took place from 07 March to 12 April 2022 and was designed observe the transformation of air masses during their meridional transport in North Atlantic sector Arctic. We evaluate meteorological sea ice conditions based on European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis v5 (ERA5), satellite data, atmospheric soundings with respect climatology describe special synoptic events. started a warm period (11–20 March) where...
The Arctic region plays a crucial role in the global methane (CH4) budget, as it is anticipated to contain substantial CH4 sources, such (subsea) permafrost. sparse network of land-based meteorological observation stations results significant data gaps, particularly for marine sea-ice covered regions. Ship-based measurements can complement enhancing our process understanding cycling including source-sink dynamics.This study presents ship-borne observations concentration and...
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. Marine cold air outbreaks (MCAOs) strongly affect the Arctic water cycle and, thus, climate through large-scale mass transformations. The description of transformations is still challenging partly because previous observations do not resolve fine scales, particularly for initial development a MCAO, and lack information about cloud microphysical properties. Therefore, we focus on crucial within first 200 km over open two MCAO events with different strengths observed during...
Strongly charged head-to-head domain walls that are purposely engineered along the [110] crystallographic orientation into ferroelectric BaTiO3 single crystals have been proposed as intrinsically nanoscaled two-dimensional electron gases (2DEGs) because of their significant conductivity. Here, we quantify these 2DEG properties through dedicated Hall transport measurements in van der Pauw 4-point geometry, finding mobility to reach around 400 cm2 (V s)−1, while charge density amounts 7 × 103...
In the last decade, conductive domain walls (CDWs) in single crystals of uniaxial model ferroelectric lithium niobate (${\mathrm{Li}\mathrm{Nb}\mathrm{O}}_{3}$; LNO) have been shown to reach resistances more than 10 orders magnitude lower resistance surrounding bulk, with charge carriers being firmly confined sheets a width few nanometers. LNO is thus currently witnessing increased attention because its potential design room-temperature nanoelectronic circuits and devices based on such CDWs....
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. Marine cold-air outbreaks (MCAOs) strongly affect the Arctic water cycle and, thus, climate through large-scale air mass transformations. The description of transformations is still challenging, partly because previous observations do not resolve fine scales, particularly for initial development an MCAO, and due to a lack information about thermodynamical evolution starting over sea ice continuing open ocean associated cloud microphysical properties. Therefore, we focus on crucial...
Thin-film lithium niobate (TFLN) in the form of x- or z-cut lithium-niobate-on-insulator has attracted considerable interest as a very promising and novel platform for developing integrated optoelectronic (nano)devices exploring fundamental research. Here, we investigate coherent interaction length lc optical second-harmonic generation (SHG) microscopy such samples, that are purposely prepared into wedge shape, order to elegantly tune geometrical confinement from bulk thicknesses down...
Ferroelectric domain boundaries are quasi-two-dimensional functional interfaces with high prospects for nanoelectronic applications. Despite their reduced dimensionality, they can exhibit complex non-Ising polarization configurations and unexpected physical properties. Here, the impact of three-dimensional (3D) curvature on profile nominally uncharged 180° walls in LiNbO3 is studied using second-harmonic generation microscopy 3D polarimetry analysis. Correlations between domain-wall...
Abstract. In this case study, measured solar irradiances above and below Arctic cirrus are compared to simulations of the European Centre for Medium-Range Weather Forecasts’ Integrated Forecasting System (IFS) making use offline runs operational ecRad radiation scheme. Independent irradiances, properties derived from active remote sensing used evaluate optical microphysical parameterizations in ecRad. The data set was collected central over sea ice (81°–90° North) with High Altitude LOng...
Abstract. The simulations of upward and downward irradiances by the Integrated Forecasting System (IFS) European Centre for Medium-Range Weather Forecasts are compared with broadband solar irradiance measurements from Arctic CLoud Observations Using airborne during polar Day (ACLOUD) campaign. For this purpose, offline radiative transfer were performed ecRad radiation scheme using operational IFS output. agree within measurement uncertainty. However, underestimates reflected above sea ice...
Low-level clouds in the Arctic affect surface energy budget and vertical transport of heat moisture. The limited availability cloud-droplet-forming aerosol particles strongly impacts cloud properties lifetime. Vertical particle distributions are required to study aerosol–cloud interaction over sea ice comprehensively. This article presents vertically resolved measurements number concentrations sizes using tethered balloons. data were collected during Multidisciplinary drifting Observatory...
Abstract Optically nonlinear Pb 2 B 5 O 9 X (X = Cl, Br) borate halides are an important group of materials for second harmonic generation (SHG). Additionally, they also possess excellent photocatalytic activity and stability in the process dechlorination chlorophenols, which typical persistent organic pollutants. It would be great interest to conduct situ (photo‐) catalysis investigations during whole by SHG when considering them as materials. In order get superior efficiency maximum...
During marine cold air outbreaks (MCAOs), and dry Arctic masses are transported from the central southward across closed sea ice much warmer open oceans. They experience significant transformations including a rapid heating moistening, often leading to cloud formation. While intense wintertime MCAOs have been analyzed widely, mass during other seasons studied sparsely. We address this gap by investigating an MCAO case observed in September 2020. To study transformation processes, we combine...