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SUMMARY:A synthesised global database of dimethylsulfide concentration in 
 the marine atmosphere - George Manville\, University of Exeter
DTSTART:20260210T110000Z
DTEND:20260210T120000Z
UID:TALK242647@talks.cam.ac.uk
CONTACT:Yao Ge
DESCRIPTION:Abstract\nFive decades of extensive research have highlighted 
 the significant influence of ocean-emitted dimethylsulfide (DMS) on global
  climate\, primarily through its role in marine aerosol and cloud condensa
 tion nuclei formation. However\, uncertainties persist in seawater DMS con
 centrations\, sea-air exchange rates\, and atmospheric chemical pathways w
 hich determine its fate in the atmosphere. Current models of DMS emissions
  are predominantly informed by seawater observations\, partly due to the l
 ack of globally synthesised atmospheric DMS data. Here\, I present the fir
 st synthesised global database of marine atmospheric DMS observations\, co
 mprising over 1.4 million measurements from 50 ship campaigns\, 48 aircraf
 t campaigns (>150 flights)\, and 11 stations\, spanning a 37-year period (
 1987-2024) and covering all major ocean basins. Using the GFDL Atmospheric
  Model version 4 (AM4)\, I demonstrate that this database offers new const
 raints on seawater DMS\, gas transfer parameterisations\, and DMS lifetime
 . This database helps provide insights into the mechanisms governing DMS c
 ycling and its impact on regional and global climate dynamics.\n\nBio\nGeo
 rge is a Postdoctoral Research Fellow in the Aerosols\, Clouds\, and Clima
 te group at the University of Exeter\, working in close collaboration with
  the UK Met Office. His research focuses on understanding the source regio
 ns of natural aerosols and their precursors\, using tools such as Lagrangi
 an source-receptor modelling and machine learning techniques. Previously\,
  he led field-based research conducting dimethylsulfide (DMS) measurements
  in the Southern Ocean marginal ice zone\, produced the first global analy
 sis of controls on seawater DMS spatial variability\, co-authored the late
 st global seawater DMS climatology\, and worked extensively with Earth sys
 tem models. Prior to his current role\, he worked at Princeton University 
 and NOAA’s Geophysical Fluid Dynamics Laboratory\, where he led an inter
 national collaborative effort to develop the first global atmospheric DMS 
 observational database. In this talk\, he will present key results from th
 at effort and discuss implications for constraining DMS cycling in Earth s
 ystem models.
LOCATION:Chemistry Dept\, Unilever Lecture Theatre and Teams
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