KlimaCampus Kolloquium: Benjamin Murray

31.05.2018

Benjamin Murray from the School of Earth and Environment, University of Leeds, is guest of Bjorn Stevens (MPI-M).

Time: 3:15 PM, Room 22/23 Bundestraße 53 (ground floor).

The Seeds of Ice in Clouds

The formation of ice in clouds is fundamentally important to life on our planet since
cold clouds play a central role in climate and the hydrological cycle. Despite the
significance of ice formation, our quantitative understanding of sources, properties,
mode of action and transport of Ice-Nucleating Particles (INP) is remarkably poor. In
this seminar I will review some of the advances we have made over recent years,
focusing on improving knowledge of mineral dust INPs from deserts through laboratory
and modelling work as well as using aircraft and ground stations on either side of the
tropical Atlantic. As part of this, I will illustrate how we cross scales from laboratory
research where we can identify nanoscale ice nucleation sites through to planetary
scale modelling of INP and interaction with cloud fields. In addition, I will present
some of our recent modelling work where we have shown that the correct
representation of INP concentrations in shallow cold-sector clouds over the Southern
Ocean is critical for their representation. Many global models are structurally incapable
of allowing clouds to persist in a highly supercooled state and therefore are
unrealistically insensitive to INP concentrations. Supercooled Southern Ocean clouds
help illustrate the importance of INP concentrations throughout our planet’s
atmosphere and why we need to consolidate our effort in quantifying atmospheric INP,
predicting their changes in the future and correctly representing them in weather and
climate models.

All talks in Winter Term 2017/18