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UP: Fachverband Umweltphysik

UP 3: Atmospheric Dynamics

UP 3.2: Vortrag

Dienstag, 17. März 2020, 14:30–14:50, HSZ 105

Could there be a synchronization between the phases of the Madden-Julian oscillation and the solar 27-day cycle? — •Christoph Hoffmann and Christian von Savigny — Universität Greifswald, Institut für Physik, Felix-Hausdorff-Str. 6, 17487 Greifswald

The solar irradiance is subject to variations on different time scales including the 27-day cycle. These variations are known to introduce variability in the upper and middle atmosphere. Implications for the troposphere are currently under discussion.

The Madden-Julian oscillation (MJO) is a major source of intraseasonal variability in the troposphere. Recently, studies have indicated that the occurrence of strong MJO events could be modulated by the solar 27-day cycle.

We analyze whether also the temporal evolution of the MJO phases could be linked to the solar 27-day cycle and find indications for such a synchronization, which are most notable under particular atmospheric background conditions, like, e.g., boreal winter conditions. We do not claim to unambiguously prove this relationship; neither in a statistical, nor in a causal sense. Instead, we challenge these initial findings ourselves in detail by varying underlying datasets and methods. Note that the question discussed here, is not connected to the questions concerning the influence of the sun on the Earth's climate but addresses much shorter time scales.