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Your search keyword '"Wolke, Ralf"' showing total 24 results
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24 results on '"Wolke, Ralf"'

17. APPLICATIONS OF MESOSCALE MODELS FOR AIR POLLUTION RESEARCH

Author

Douros, John, primary, Fragkou, Evangelia, additional, Barmpadimos, Iakovos, additional, Chemel, Charles, additional, Deserti, Marco, additional, Finzi, Giovanna, additional, Friese, Elmar, additional, Geertsema, Gertie, additional, Keller, Johannes, additional, Kesanurm, Kaisa, additional, Martins, Vera, additional, Matthias, Volker, additional, Minguzzi, Enrico, additional, Miranda, Ana Isabel, additional, Monteiro, Alexandra, additional, Pérez, Juan L., additional, Prank, Marje, additional, Quante, Markus, additional, Sá, Elisa, additional, José, Roberto San, additional, Schaap, Martijn, additional, Schlünzen, K. Heinke, additional, Sofiev, Mikhail, additional, Sokhi, Ranjeet S., additional, Stern, Rainer, additional, Struzewska, Joanna, additional, Vautard, Robert, additional, and Wolke, Ralf, additional

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21. Formation of Secondary Inorganic Aerosols by High Ammonia Emissions Simulated by LM/MUSCAT.

Author

Renner, Eberhard and Wolke, Ralf

Abstract

Ammonia (NH3) is the most abundant gaseous base and responsible for neutralizing a large fraction of acidic gases promoting the formation of atmospheric particles. Therefore, the contribution of ammonia to the formation of secondary particles (PM2.5and PM10) in a regional scale is examined. The aerosols result from SO2 and NOx via sulfuric and nitric acid formation in the gas- and the liquid-phase and following subsequent reactions with ammonia. A period in May and a period in August/September 2006 were simulated by a nested application of the model system LM-MUSCAT. [ABSTRACT FROM AUTHOR]

Published
2008
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22. Chapter 5.5: Modeling of Saharan dust events within SAMUM: Implications for regional radiation balance and mesoscale circulation.

Author

Helmert, Jürgen, Heinold, Bernd, Tegen, Ina, Hellmuth, Olaf, and Wolke, Ralf

Abstract

Using a new regional dust model system the sensitivity of radiative forcing to dust aerosol properties and the impact on atmospheric dynamics were investigated. The climatological based distribution of desert-type aerosol in the radiation scheme of the regional model LM was replaced by dust optical properties from spectral refractive indices derived from in-situ measurements, remote sensing, bulk measurements, and laboratory experiments, employing Mie theory. A model study of a Saharan dust outbreak in October 2001 was carried out, when large amounts of Saharan dust were transported to Europe. For October, 11, 2001 simulated dust radiative impact and feedback mechanisms on 2 m-temperature and 10 m-wind speed were investigated. [ABSTRACT FROM AUTHOR]

Published
2007
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23. Cloud Chemistry Modeling: Parcel and 3D Simulations.

Author

Borrego, Carlos, Norman, Ann-Lise, Sehili, Aissa-Mounir, Wolke, Ralf, Helmert, Jürgen, Simmel, Martin, Schröder, Wolfram, and Renner, Eberhard

Abstract

The interaction of gases and aerosol particles with clouds entails a number of key environmental processes. On the one hand, they directly influence the life cycles of trace constituents and facilitate conversions of these trace constituents. On the other hand, multiphase transformations strongly influence cloud formation. Over a long time, the complexities of the cloud processes involved have discouraged investigators from simultaneously treating all aspects of multiphase chemistry and microphysics with equal rigor. Many recently available models focus either on complex multiphase chemistry only in a few aggregated drop classes (Ervens et al., 2003; Herrmann et al., 2000), or detailed microphysics for strongly simplified chemical mechanisms (Bott, 1999). The last year's efforts invested to develop sophisticated cloud models with complex multiphase chemistry allows more detailed studies on the interaction between microphysical and chemical multiphase processes (Leriche et al., 2000, 2003; Ervens et al., 2004). This is also true of size-resolved parameterizations of cloud chemistry in chemistry-transport codes (Gong et al., 2003). [ABSTRACT FROM AUTHOR]

Published
2006
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24. Poster 27: Modeling of Saharan dust events within SAMUM: On the description of the Saharan dust cycle using LM-MUSCAT.

Author

Heinold, Bernd, Helmert, Jürgen, Tegen, Ina, Hellmuth, Olaf, and Wolke, Ralf

Abstract

The multiscale model system LM-MUSCAT consists of two online coupled codes. The operational forecast model LM (Local Model) of the German Weather Service and the chemistry transport model MUSCAT (Multi-Scale Atmospheric Transport Model). The coupler provides MUSCAT with meteorological fields like temperature, humidity and density from LM. An improved coupling scheme was developed to optimize the parallel efficiency of the model system. [ABSTRACT FROM AUTHOR]

Published
2007
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