Author : Zeng, Yuefei
Publisher : KIT Scientific Publishing
Page : 256 pages
File Size : 21,54 MB
Release : 2014-09-26
Category : Biography & Autobiography
ISBN : 3731501287
Doppler radars provide unique 3D information about precipitating clouds in high spatial and temporal resolutions. However, the observed quantities (reflectivity, Doppler velocity and polarization properties) are not directly comparable to the variables of numerical prediction models. In order to enable radar data assimilation, a comprehensive modular radar forward operator has been developed.
Author : Jerger, Dorit
Publisher : KIT Scientific Publishing
Page : 145 pages
File Size : 14,29 MB
Release : 2014-05-19
Category : Science
ISBN : 3731501724
In this work, various simulation methods of the effective radar reflectivity factor and its attenuation by atmospheric particles from the variables of the COSMO model have been implemented within a so-called radar forward operator, and its output was compared to measurements from the German radar network. To perform a statistically reliable model verification, contoured frequency by altitude diagrams (CFADs) were used and refined.
Author : Mehdi Khaki
Publisher : Springer Nature
Page : 292 pages
File Size : 43,43 MB
Release : 2020-01-02
Category : Science
ISBN : 3030373754
This book presents the fundamentals of data assimilation and reviews the application of satellite remote sensing in hydrological data assimilation. Although hydrological models are valuable tools to monitor and understand global and regional water cycles, they are subject to various sources of errors. Satellite remote sensing data provides a great opportunity to improve the performance of models through data assimilation.
Author : Loewe, Katharina
Publisher : KIT Scientific Publishing
Page : 174 pages
File Size : 10,12 MB
Release : 2017-09-15
Category : Physics
ISBN : 3731506866
This work provides new insights into macro- and microphysical properties of Arctic mixed-phase clouds: first, by comparing semi-idealized large eddy simulations with observations; second, by dissecting the influences of different surface types and boundary layer structures on Arctic mixed- phase clouds; third, by elucidating the dissipation process; and finally by analyzing the main microphysical processes inside Arctic mixed-phase clouds.
Author : Singh, Shweta
Publisher : KIT Scientific Publishing
Page : 198 pages
File Size : 39,78 MB
Release : 2021-08-16
Category : Science
ISBN : 3731510685
The impact of land-surface properties like vegetation, soil type, soil moisture, and the orography on the atmosphere is manifold. These features determine the evolution of the atmospheric boundary layer, convective conditions, cloud evolution and precipitation. The impact of model grid spacing and land-surface resolution on convective precipitation over heterogeneous surfaces is investigated using ICOsahedral Nonhydrostatic (ICON) simulations within the framework of the HD(CP)2 project.
Author : Stawiarski, Christina
Publisher : KIT Scientific Publishing
Page : 262 pages
File Size : 42,64 MB
Release : 2014-07-10
Category : Science
ISBN : 373150197X
Coherent structures are patterns in the wind field of the atmospheric boundary layer. The deployment of two scanning Doppler lidars facilitates the measurement of the horizontal wind field, but the inherent averaging processes complicate an interpretation of the results. To assess the suitability of this technique for coherent structure detection large-eddy simulations are used as a basis for virtual measurements, and the effects of the lidar technique on the wind field structure are analyzed.
Author : Wandel, Jan Lucas
Publisher : KIT Scientific Publishing
Page : 256 pages
File Size : 17,5 MB
Release : 2023-05-25
Category : Science
ISBN : 3731512491
This study systematically investigates the representation of warm conveyor belts (WCBs) in large reforecast data sets of different numerical weather prediction models and evaluates the role of WCBs for the onset and life cycle of Atlantic-European weather regimes. The results emphasize the importance of accurate forecast of WCBs for sub-seasonal prediction on time scales beyond two weeks and tie the low forecast skill of blocked weather regimes over Europe to misrepresented WCBs.
Author : Adler, Bianca
Publisher : KIT Scientific Publishing
Page : 272 pages
File Size : 44,92 MB
Release : 2014-09-12
Category : Physics
ISBN : 373150247X
Over complex terrain, spatial inhomogeneities of pre-convective atmospheric conditions occur due to convection and mesoscale transport processes. This thesis focuses on the identification of these processes over the mountainous island of Corsica and on the evaluation of their impact on the spatial variability of water vapour, convection-related parameters and the evolution of deep convection by means of observations.
Author : Lott, Friederike Franziska
Publisher : KIT Scientific Publishing
Page : 270 pages
File Size : 34,75 MB
Release : 2017-02-22
Category : Physics
ISBN : 3731505967
Atmospheric processes, such as wind, impact the ground motion of the earth and have the potential to induce strong broad-band noise in seismological records. In order to quantify the influence of wind on ground motion velocity joint seismological and meteorological measurements were conducted at the Dead Sea.Results reveal a pronounced impact of wind on seismological records. A methodology is presented to account for the dependency of PSD of ground motion velocity on the horizontal wind field.
Author : Metzger, Jutta
Publisher : KIT Scientific Publishing
Page : 236 pages
File Size : 44,88 MB
Release : 2017-10-17
Category : Physics
ISBN : 3731506998
A new measurement concept was developed to determine the amount, variability and governing factors of evaporation from the Dead Sea. Additionally, a suitable indirect method to calculate evaporation is presented. Results show that vapour pressure deficit and wind speed are governing evaporation and that the diurnal cycle is determined by three distinct diurnal wind systems. The occurrence frequency and intensity of the wind systems are determined by local differential cooling and heating.
