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SUMMARY:EESS Student talk on "Climate-relevant natural aerosol processes i
 n the Arctic"
DTSTART:20250520T121500
DTEND:20250520T124500
DTSTAMP:20260926T221337Z
UID:e42041233c5c61c0be1bf87855986169f914bc57f6342b7da3520b27
CATEGORIES:Conferences - Seminars
DESCRIPTION:Nora Bergner\, PhD Student\, EERL\nAbstract:\nThe Arctic is w
 arming three to four times faster than the rest of the globe with drastic 
 local and global consequences. Aerosol and cloud processes play an essenti
 al role in the Arctic energy balance but incomplete process understanding 
 and representation in climate models lead to uncertainties in quantifying 
 current and future climate change. Natural aerosol sources\, including sea
  salt aerosol and mineral dust\, have complex source processes and are und
 ergoing changes that remain poorly understood. Sea salt aerosol in the cen
 tral Arctic can originate from sublimating salty blowing snow\, but direct
  observations of this process are limited. Rapid retreat of glaciers expos
 es new land surfaces and leads to the formation of glacial outwash plains 
 rich in fine glacial dust\, which can influence cloud properties and radia
 tive transfer through wind-driven emissions. We investigate these natural
  aerosol processes using field campaign data and experimental methods. Com
 prehensive measurements during the year-long “Multidisciplinary drifting
  Observatory for the Study of Arctic Climate” (MOSAiC) expedition in the
  central Arctic reveal that aerosol number concentrations\, cloud condensa
 tion nuclei concentrations\, and scattering coefficients are greatly enhan
 ced during blowing snow events\, particularly in fall. In southern Greenla
 nd\, field measurements and glacial sediment samples allow us to evaluate 
 the natural aerosol baseline and the abundance of ice-nucleating particles
  (INPs) in glacial outwash plains\, which are critical for cloud phase and
  radiative properties. Preliminary results indicate that glacial dust show
 s good ice-nucleating properties\, influenced by local environmental facto
 rs\, including the presence of organic matter. These findings advance our 
 understanding of Arctic natural aerosol processes and their possible clima
 te impacts.\n\nBiography:\nNora Bergner is a PhD student at the Extreme En
 vironments Research Laboratory with Julia Schmale. Her research focuses on
  understanding natural Arctic coarse-mode aerosol processes and their clim
 ate-relevant properties. Before joining EERL\, she completed her master’
 s degree in Atmospheric and Climate science at ETH Zürich.
LOCATION:ALP 1 107 https://plan.epfl.ch/?room==ALP%201%20107 https://epfl.
 zoom.us/j/69011077410
STATUS:CONFIRMED
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