Veranstaltungskalender

 
Online Seminar

Ice nucleating aerosol particles and the cloud-phase climate feedback’

Dienstag, 09. Juni 2020, 14:00-15:00
University of Leeds

An enigmatic population of atmospheric aerosol particles is capable of catalysing the formation of ice in the atmosphere. These ice-nucleating particles, which make up a very small fraction of aerosol, have a disproportionate impact on cloud hydrometeor size, precipitation and radiative properties, but their concentration around the globe is poorly defined. In this talk I will focus on shallow oceanic cloud systems in the mid- to high-latitudes which are responsible for substantial biases in climate models and appear to be linked to the larger equilibrium climate sensitivities in CMIP6 verses CMIP5 models. We have shown that the concentration of ice nucleating particles is a first order driver for the properties of these clouds and their role in climate feedbacks. However, the concentration, temperature spectra and sources of ice nucleating particles relevant for these specific clouds types is very poorly understood. As well as reviewing the relevant literature, I will discuss our recent laboratory, field and modelling research on ice nucleating particle sources in the mid- to high-latitudes relevant for these specific cloud systems. Finally, I will summarise what the key questions are and speculate on how changes in future ice nucleating particle emissions might amplify future warming.

Diese Veranstaltung ist Teil der Reihe ICAS External Seminar
Veranstalter
School of Earth & Environment
University of Leeds
Leeds
E-Mail: M VanDerGucht does-not-exist.leeds ac uk
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