Arctic Mixed-phase Clouds
Arctic Mixed-phase Clouds

Author: Katharina Loewe

Publisher:

Published: 2020-10-09

Total Pages: 160

ISBN-13: 9781013281211

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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. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

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

Author: Loewe, Katharina

Publisher: KIT Scientific Publishing

Published: 2017-09-15

Total Pages: 174

ISBN-13: 3731506866

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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.

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

Author: Deetz, Konrad

Publisher: KIT Scientific Publishing

Published: 2018-01-30

Total Pages: 344

ISBN-13: 3731507447

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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.

Convective precipitation simulated with ICON over heterogeneous surfaces in dependence on model and land-surface resolution
Convective precipitation simulated with ICON over heterogeneous surfaces in dependence on model and land-surface resolution

Author: Singh, Shweta

Publisher: KIT Scientific Publishing

Published: 2021-08-16

Total Pages: 198

ISBN-13: 3731510685

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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.

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

Published: 2023-05-25

Total Pages: 256

ISBN-13: 3731512491

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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.

Contrails and Climate Engineering - Process Studies on Natural and Artificial High-Level Clouds and Their Impact on the Radiative Fluxes
Contrails and Climate Engineering - Process Studies on Natural and Artificial High-Level Clouds and Their Impact on the Radiative Fluxes

Author: Gruber, Simon

Publisher: KIT Scientific Publishing

Published: 2019-03-22

Total Pages: 282

ISBN-13: 3731508966

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Two aspects of anthropogenic impacts on the atmosphere are investigated using means of numerical weather prediction. A case study is conducted to estimate the impact of such artificial clouds on the incoming solar radiation at the Earth's surface with special regard to photovoltaic power production. Furthermore, simulations are performed to assess the efficacy of injecting particles into the Arctic troposphere with the aim of modifying cirrus clouds for counteracting global warming.

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

Author: Pickl, Moritz

Publisher: KIT Scientific Publishing

Published: 2023-03-30

Total Pages: 250

ISBN-13: 373151236X

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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.

Objective identification and climatology of mesoscale high-wind features within extratropical cyclones
Objective identification and climatology of mesoscale high-wind features within extratropical cyclones

Author: Eisenstein, Lea Andrea

Publisher: KIT Scientific Publishing

Published: 2024-10-01

Total Pages: 222

ISBN-13: 3731513749

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Strong winds accompanying extratropical cyclones are commonly associated with various mesoscale features. This work introduces RAMEFI (RAndom-forest-based Mesoscale wind Feature Identification), an objective and flexible identification approach based on key surface characteristics to distinguish these features. RAMEFI is further applied to compile a climatology over Europe, offering a comprehensive analysis of feature frequency, distribution, and characteristics.