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Now showing items 21-40 of 134

Dark matter searches using accelerometer-based networks

Figueroa, Nataniel L.; Budker, Dmitry; Rasel, Ernst M. (Philadelphia, PA : IOP Publishing, 2021)

Dark matter (DM) is one of the biggest open questions in physics today. It is known that it interacts gravitationally with luminous matter, so accelerometer-based searches are inherently interesting. In this article we ...
Data Processing and Investigations for the GRACE Follow-On Laser Ranging Interferometer

Misfeldt, Malte Matthias (Hannover : Leibniz Universität Hannover, Max Planck Institute for Gravitational Physics, 2019-06-15)

This thesis presents first in-depth results of the Laser Ranging Interferometer (LRI) onboard the Gravity Recovery And Climate Experiment - Follow On (GRACE-Follow On) mission. The LRI is a novel instrument, which was ...
Demistify: A large-eddy simulation (LES) and single-column model (SCM) intercomparison of radiation fog

Boutle, Ian; Angevine, Wayne; Bao, Jian-Wen; Bergot, Thierry; Bhattacharya, Ritthik; Bott, Andreas; Ducongé, Leo; Forbes, Richard; Goecke, Tobias; Grell, Evelyn; Hill, Adrian; Igel, Adele L.; Kudzotsa, Innocent; Lac, Christine; Maronga, Bjorn; Romakkaniemi, Sami; Schmidli, Juerg; Schwenkel, Johannes; Steeneveld, Gert-Jan; Vié, Benoît (Katlenburg-Lindau : EGU, 2022)

An intercomparison between 10 single-column (SCM) and 5 large-eddy simulation (LES) models is presented for a radiation fog case study inspired by the Local and Non-local Fog Experiment (LANFEX) field campaign. Seven of ...
Derivation of sky luminance and spectral sky radiance from images taken with a CCD camera

Tohsing, Korntip (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2013)

[no abstract]
Derivation of Structure Parameters of Temperature and Humidity in the Convective Boundary Layer from Large-Eddy Simulations and Implications for the Interpretation of Scintillometer Observations

Maronga, Björn; Moene, Arnold F.; van Dinther, Danielle; Raasch, Siegfried; Bosveld, Fred C.; Gioli, Beniamino (Heidelberg : Springer Verlag, 2013)

We derive the turbulent structure parameters of temperature CT 2 and humidity Cq 2 from high-resolution large-eddy simulations (LES) of a homogeneously-heated convective boundary layer. Boundary conditions and model forcing ...
Detecting and tracking eddies in oceanic flow fields: A Lagrangian descriptor based on the modulus of vorticity

Vortmeyer-Kley, R.; Gräwe, Ulf; Feudel, U. (Göttingen : Copernicus GmbH, 2016)

Since eddies play a major role in the dynamics of oceanic flows, it is of great interest to detect them and gain information about their tracks, their lifetimes and their shapes. We present a Lagrangian descriptor based ...
Development of a new urban climate model based on the model PALM – Project overview, planned work, and first achievements

Maronga, Björn; Gross, Günther; Raasch, Siegfried; Banzhaf, Sabine; Forkel, Renate; Heldens, Wieke; Kanani-Sühring, Farah; Matzarakis, Andreas; Mauder, Matthias; Pavlik, Dirk; Pfafferott, Jens; Schubert, Sebastian; Seckmeyer, Gunther; Sieker, Heiko; Winderlich, Kristina (Stuttgart : E. Schweizerbart Science Publishers, 2019)

In this article we outline the model development planned within the joint project Model-based city planning and application in climate change (MOSAIK). The MOSAIK project is funded by the German Federal Ministry of Education ...
Dispersion scenarios for pollution release in an occupied underground station - a numerical study with a micro-scale and a multi-Agent model

Gross, Günter (Stuttgart : Gebrueder Borntraeger Verlagsbuchhandlung, 2015)

The release of hazardous material in a subway station is a dangerous situation for passengers and staff. To achieve an acceptable level of risk, a correct marking of emergency exits and escape routes is essential., For ...
Effects of unstable stratification on ventilation in Hong Kong

Gronemeier, Tobias; Raasch, Siegfried; Ng, Edward (Basel : MDPI AG, 2017)

Ventilation in cities is crucial for thewell being of their inhabitants. Therefore, local governments require air ventilation assessments (AVAs) prior to the construction of new buildings. In a standard AVA, however, only ...
Entwicklung eines Modells zur Simulation von postfrontalen Niederschlagsgebieten

Himmelsbach, Stephan (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)

[no abstract]
European UV DataBase (EUVDB) as a repository and quality analyser for solar spectral UV irradiance monitored in Sodankylä

Heikkilä, Anu; Kaurola, Jussi; Lakkala, Kaisa; Karhu, Juha Matti; Kyrö, Esko; Koskela, Tapani; Engelsen, Ola; Slaper, Harry; Seckmeyer, Gunther (Göttingen : Copernicus GmbH, 2016)

Databases gathering atmospheric data have great potential not only as data storages but also in serving as platforms for coherent quality assurance (QA). We report on the flagging system and QA tools designed for and ...
Evaluation of a Sr+ 88 Optical Clock with a Direct Measurement of the Blackbody Radiation Shift and Determination of the Clock Frequency

Steinel, M.; Shao, H.; Filzinger, M.; Lipphardt, B.; Brinkmann, M.; Didier, A.; Mehlstäubler, T. E.; Lindvall, T.; Peik, E.; Huntemann, N. (College Park, Md. : APS, 2023)

We report on an evaluation of an optical clock that uses the S21/2→D25/2 transition of a single Sr+88 ion as the reference. In contrast to previous work, we estimate the effective temperature of the blackbody radiation ...
Evaluation of large-eddy simulations forced with mesoscale model output for a multi-week period during a measurement campaign

Heinze, Rieke; Moseley, Christopher; Böske, Lennart Nils; Muppa, Shravan Kumar; Maurer, Vera; Raasch, Siegfried; Stevens, Björn (Göttingen : Copernicus GmbH, 2017)

Large-eddy simulations (LESs) of a multi-week period during the HD(CP)2 (High-Definition Clouds and Precipitation for advancing Climate Prediction) Observational Prototype Experiment (HOPE) conducted in Germany are evaluated ...
Evaporation over a heterogeneous land surface: The EVA-GRIPS Project

Mengelkamp, H.-T.; Beyrich, F.; Heinemann, G.; Ament, F.; Bange, J.; Berger, F.; Bösenberg, J.; Foken, T.; Hennemuth, B.; Heret, C.; Huneke, C.; Johnsen, K.-P.; Kerschgens, M.; Kohsiek, W.; Leps, J.-P.; Liebethal, C.; Lohse, H.; Mauder, M.; Meijninger, W.; Raasch, S.; Simmer, C.; Spieß, T. A.; Tittebrand, A.; Uhlenbrock, J.; Zittel, P. (Boston, Massachusetts : American Meteorological Society, 2006)

The representation of subgrid-scale surface heterogeneities in numerical weather and climate models has been a challenging problem for more than a decade. The Evaporation at Grid and Pixel Scale (EVA-GRIPS) project adds ...
Evolution and Features of Dust Devil-Like Vortices in Turbulent Rayleigh-Bénard Convection—A Numerical Study Using Direct Numerical Simulation

Giersch, S.; Raasch, S. (Hoboken, NJ : Wiley, 2021)

Dust devils are convective vortices with a vertical axis of rotation that are made visible by entrained soil particles. These soil particles contribute to the atmospheric aerosol input, influencing the Earth radiation ...
Examination of the mixed layer deepening process during convection using LES

Noh, Y.; Goh, G.; Raasch, S. (Boston, Massachusetts : American Meteorological Society, 2010)

Analysis of large-eddy simulation data of the ocean mixed layer under convection reveals that the contribution from wind stress decreases with time as a result of inertial oscillation in the extratropical ocean and that ...
First Demonstration of 6 dB Quantum Noise Reduction in a Kilometer Scale Gravitational Wave Observatory

Lough, James; Schreiber, Emil; Bergamin, Fabio; Grote, Hartmut; Mehmet, Moritz; Vahlbruch, Henning; Affeldt, Christoph; Brinkmann, Marc; Bisht, Aparna; Kringel, Volker; Lück, Harald; Mukund, Nikhil; Nadji, Severin; Sorazu, Borja; Strain, Kenneth; Weinert, Michael; Danzmann, Karsten (College Park, Md. : APS, 2021)

Photon shot noise, arising from the quantum-mechanical nature of the light, currently limits the sensitivity of all the gravitational wave observatories at frequencies above one kilohertz. We report a successful application ...
Formation of a diurnal thermocline in the ocean mixed layer simulated by LES

Noh, Y.; Goh, G.; Raasch, S.; Gryschka, M. (Boston, Massachusetts : American Meteorological Society, 2009)

The formation of a diurnal thermocline in the ocean mixed layer under a stabilizing buoyancy flux was simulated successfully by large-eddy simulation, reproducing various features consistent with observation. The analysis ...
The Generalized Method of Wavelet Moments with eXogenous inputs: a fast approach for the analysis of GNSS position time series

Cucci, Davide A.; Voirol, Lionel; Kermarrec, Gaël; Montillet, Jean-Philippe; Guerrier, Stéphane (Berlin ; Heidelberg : Springer, 2023)

The global navigation satellite system (GNSS) daily position time series are often described as the sum of stochastic processes and geophysical signals which allow to study global and local geodynamical effects such as ...
Generation of Level 1 Data Products and Validating the Correctness of Currently Available Release 04 Data for the GRACE Follow-On Laser Ranging Interferometer

Müller, Laura (Hannover : Leibniz Universität Hannover, Max Planck Institute for Gravitational Physics, 2021-10-22)

The satellite pair of the Gravity Recovery and Climate Experiment (GRACE) Follow-On orbits the Earth, while their inter-satellite distance changes are measured with an accuracy never reached before. This is achieved with ...

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