BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Invisible Ship Tracks: What can we learn about the aerosol effect 
 on clouds and climate from previously unseen ship-polluted clouds?  - Pete
 r Manshausen (University of Oxford)
DTSTART:20221207T150000Z
DTEND:20221207T160000Z
UID:TALK193510@talks.cam.ac.uk
CONTACT:104065
DESCRIPTION:Aerosols\, e.g. soot\, dust\, etc.\, provide the condensation 
 nuclei around which cloud droplets form. By burning fossil fuels\, humans 
 have drastically increased the amount of aerosols in the atmosphere. More 
 aerosols lead to more cloud droplets\, which make the clouds more reflecti
 ve\, thereby cooling the planet and partly counteracting greenhouse gas-in
 duced heating. But the magnitude of this effect is poorly constrained and 
 the effect of aerosols on the amount of water in a cloud\, which is also i
 mportant for its reflectivity\, is uncertain. It is hard to experiment on 
 a system of the size of clouds or weather systems\, so studies rely on opp
 ortunistic experiments\, like a ship emitting aerosol into marine clouds a
 long its path. This leads to lines of more reflective clouds that were dis
 covered in some of the first satellite images in the 60s. Comparing the po
 lluted and the unpolluted parts can help to quantify the effect of anthrop
 ogenic aerosols more generally. However\, fewer than 2% of ships leave vis
 ible ship tracks behind. Are these tracks representative of the effect of 
 aerosols on clouds in other regions and under other meteorological conditi
 ons? Why are some of them visible and others are not? And is there no effe
 ct when we cannot see a track? 
LOCATION:Unilever Lecture Hall (and zoom https://us02web.zoom.us/j/8650067
 6542?pwd=NTFuNnpJQ1orMzZtem10cFNySjJiZz09 ))
END:VEVENT
END:VCALENDAR