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Observational evidence for human impact on aerosol cloud-mediated processes in the Baltic region

Krüger O.

Oceanologia

2014

No. 56 (2)

205--222

Knowledge about aerosol cloud-mediated processes is important for judging climate change in Europe during recent decades. Here, some observational evidence for anthropogenic influences is described and discussed. The emphasis is laid on the effects of the large emissions of sulphur dioxide and particulate matter during the 1980s in Europe and the subsequent strong decrease in the 1990s. In addition, an analysis of the dependence of aerosol cloud-mediated processes on atmospheric circulation patterns (Grosswetterlagen) is presented.

A phase-field model for the isothermal solidification process of a binary alloy

Kessler D., Krüger O., Rappaz J.

Computer Assisted Mechanics and Engineering Sciences

2000

Vol. 7, No. 3

279-288

We study a phase-field model for the isothermal solidification of a binary alloy which involves the relative concentration and the order parameter. We prove the existence of weak solutions as well as regularity and uniqueness results under Lipschitz and boundeness assumptions for the nonlinearities. A maximum principle holds that justifies these assumptions. A numerical approximation and some numerical results are also presented