Saikiran Tharimena (University of Vienna, Department for Meteorology und Geophysics)
"Seismic anatomy of the global oceanic lithosphere - asthenosphere system"

The concept of the lithosphere asthenosphere system is well defined as the rheological boundary between the rigid lithosphere above and the weaker asthenosphere below. However, its nature remains enigmatic as tight constraints on observables that could distinguish the defining mechanism, such as the depth and seismic velocity gradient at the base of the tectonic plate, the lithosphere asthenosphere boundary (LAB), have proven challenging. Oceanic lithosphere provides an ideal location to test various theories about the nature of the LAB. It is well established that oceanic lithosphere cools, thickens, and subsides as it ages according to conductive cooling models. Yet, this simple realization fails to explain various observations, for example, lower than predicted subsidence of old oceanic lithosphere.

Although previous studies use seismic surface and body waves to image oceanic lithospheric discontinuities, directly connecting them to the LAB have proven challenging. A comprehensive and systematic high-resolution imaging of the lithospheric discontinuities can help constrain the nature of the LAB, which is essential for a better understanding of the formation and evolution of oceanic lithosphere, and the driving forces of plate tectonics and mantle convection.

This talk focuses on comprehensively imaging the LAB beneath oceans at different length scales, with focus on the Pacific Ocean using SS precursors, and on a regional scale at the equatorial mid-Atlantic ridge using receiver functions.

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Dienstag, 12:15 Uhr bis 13:30 Uhr

Roland Potthast (Deutscher Wetterdienst)
"Online versus 4D Parameter Estimation for NWP - Equivalences and Differences"

Dienstag, 12:15 Uhr bis 13:30 Uhr

Ort: UZAII, Althanstraße 14, 1090 Wien, im Raum 2B201

Domenico Cimini (National Research Council of Italy, Institute of Methodologies for Environmental Analysis)
"Profiling the atmospheric boundary layer at European scale: Prospects and challenges"

Dienstag, 12:15 Uhr bis 13:30 Uhr

Ort: UZAII, Althanstraße 14, 1090 Wien, im Raum 2B201