› › Diagnosing The Downstream Impact Of Extratropical Transition Using Multimodel Operational Ensemble Prediction Systems

Diagnosing the Downstream Impact of Extratropical Transition Using Multimodel Operational Ensemble Prediction Systems

Author : Julia Henriette Keller

Publisher : KIT Scientific Publishing

Page : 272 pages

File Size : 20,8 MB

Release : 2014-10-16

Category : Science

ISBN : 3866449844

Get eBook

Book Description

The study examines the predictability during the extratropical transition (ET) of tropical cyclones using the THORPEX Interactive Grand Global Ensemble (TIGGE), a multimodel ensemble prediction system (EPS). It is shown that TIGGE exhibits more possible development scenarios than a single EPS. By analysing the eddy kinetic energy budget of forecast scenarios for two ET cases, extracted from an EPS, the impact of the transitioning tropical cyclones on the midlatitude flow is studied in detail.



Wind Systems and Energy Balance in the Dead Sea Valley

Author : Metzger, Jutta

Publisher : KIT Scientific Publishing

Page : 236 pages

File Size : 26,76 MB

Release : 2017-10-17

Category : Physics

ISBN : 3731506998

Get eBook

Book Description

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.



Wind Systems in the Dead Sea and Footprints in Seismic Records

Author : Lott, Friederike Franziska

Publisher : KIT Scientific Publishing

Page : 270 pages

File Size : 35,45 MB

Release : 2017-02-22

Category : Physics

ISBN : 3731505967

Get eBook

Book Description

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.



Perspectives on warm conveyor belts - sensitivities to ensemble configuration and the role for forecast error

Author : Pickl, Moritz

Publisher : KIT Scientific Publishing

Page : 250 pages

File Size : 25,25 MB

Release : 2023-03-30

Category : Science

ISBN : 373151236X

Get eBook

Book Description

Warm conveyor belts (WCBs) are weather systems that substantially modulate the large-scale extratropical circulation. As they can amplify forecast errors and project them onto the Rossby wave pattern, they are of high relevance for numerical weather prediction. This work elaborates on two aspects of WCBs in the context of ensemble forecasts: (1) sensitivities of WCBs to the representation of initial condition and model uncertainties, and (2) the role of WCBs for forecast error growth.



Efficient Radar Forward Operator for Operational Data Assimilation within the COSMO-model

Author : Zeng, Yuefei

Publisher : KIT Scientific Publishing

Page : 256 pages

File Size : 44,27 MB

Release : 2014-09-26

Category : Biography & Autobiography

ISBN : 3731501287

Get eBook

Book Description

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.



Assessing the Aerosol Impact on Southern West African Clouds and Atmospheric Dynamics

Author : Deetz, Konrad

Publisher : KIT Scientific Publishing

Page : 344 pages

File Size : 23,58 MB

Release : 2018-01-30

Category : Physics

ISBN : 3731507447

Get eBook

Book Description

By using COSMO-ART, highly resolved process study simulations for 2-3 July 2016 are conducted to assess the aerosol effect on the meteorological conditions of southern West Africa. The meteorological phenomenon Evening Monsoon Flow Enhancement (EMFE) is identified as highly susceptible to the aerosol direct effect, leading to a spatial shift of the EMFE front. In a second aerosol feedback chain the aerosol variation leads to a temporal shift of the stratus-to-cumulus transition.





Separating the Aerosol Effect in Case of a "Medicane"

Author : Kraut, Isabel

Publisher : KIT Scientific Publishing

Page : 196 pages

File Size : 16,62 MB

Release : 2015-08-06

Category : Physics

ISBN : 3731504057

Get eBook

Book Description

This work addresses the interactions of aerosols, clouds and dynamics in case of a so-called Medicane. This type of cyclone occurs over the Mediterranean Sea, showing similarities to Hurricanes over the Atlantic and Pacific Ocean. Due to the high wind speed of the Medicane, a large amount of sea salt particles is emitted over the sea. This can influence the development of the Medicane, its associated clouds, and precipitation.



Representation of warm conveyor belts in sub-seasonal forecast models and the link to Atlantic-European weather regimes

Author : Wandel, Jan Lucas

Publisher : KIT Scientific Publishing

Page : 256 pages

File Size : 20,60 MB

Release : 2023-05-25

Category : Science

ISBN : 3731512491

Get eBook

Book Description

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.



Arctic mixed-phase clouds : Macro- and microphysical insights with a numerical model

Author : Loewe, Katharina

Publisher : KIT Scientific Publishing

Page : 174 pages

File Size : 26,81 MB

Release : 2017-09-15

Category : Physics

ISBN : 3731506866

Get eBook

Book Description

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.