Wydział Fizyki UW > Badania > Seminaria i konwersatoria > Środowiskowe Seminarium Fizyki Atmosfery

Środowiskowe Seminarium Fizyki Atmosfery

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Zapraszamy do sali 1.02, ul. Pasteura 5 o godzinie 13:15

prof. dr hab. Małgorzata Werner (Wydział Nauk o Ziemi i Kształtowania Środowiska, Uniwersytet Wrocławski)

Anthropogenic and natural aerosols in the atmosphere - examples of practical applications of modelling and measurements

This presentation will focus on the application of numerical modelling and measurement methods to assess air quality in Europe, with a focus on Poland. The modelling will include the state-of-the-art Eulerian chemical transport models dedicated for regional scale analysis as well as Gaussian type models used for city scale. In addition, the application of machine learning methods and the combination of chemical transport model results with observations to predict air pollution concentrations will be presented. The talk will cover the most problematic chemical pollutants such as PM2.5 (particulate matter with a diameter of less than 2.5 m), BaP (benzo(L)piren), NO2 (nitrogen dioxide) as well as biological particles such as allergenic pollen grains. Examples of the application of modelling to answer questions related to air quality management will be shown. The presentation will conclude with current challenges and opportunities for further development.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/98168055999?pwd=BWRrOr06kAFjQaIri757V8Fi1bqyCQ.1
Meeting ID: 981 6805 5999
Passcode: 016069

Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15

prof. Martin Oberlack (Department of Mechanical Engineering, Technical University of Darmstadt, Germany)

Recent progress in the symmetry based theory for near-surface shear flows

Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15

dr Simon Görtz (Technical University of Darmstadt)

Wave propagation and causality in atmospheric free shear layers

We investigate the reflection and transmission of waves through a shear layer. We use a hyperbolic tangent to model the shear layer, and reflection and transmission coefficients to quantify its interaction with pressure waves. Using causality arguments in the inverse Laplace transform, we demonstrate that the direction of the incident wave in relation to the mean velocity gradient is crucial. A wave that is incident from the upper far field and propagates in the opposite direction to the increasing velocity gradient is amplified during the reflection process, and a distinct resonance frequency exists. Conversely, waves incident from the lower far field propagate in the direction of the increasing velocity gradient. Causality reveals that these waves are damped during reflection and that a distinct total absorption frequency exists. Therefore, causality arguments underline the observation that the problem is not fully symmetric from the perspective of an incident wave, even if a symmetric mean flow profile is chosen.
Join Zoom Meeting:
https://uw-edu-pl.zoom.us/j/95929888109?pwd=gsOXOpvJ0bXl5aYrK7ppjzIy0vjqLd.1
Meeting ID: 959 2988 8109
Passcode: 874810