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SUMMARY:The role of sulphur from human emissions in driving climate change
  - Vichawan Sakulsupich\, Yusuf Hamied Dept of Chemistry\, University of C
 ambridge
DTSTART:20240220T160000Z
DTEND:20240220T170000Z
UID:TALK209716@talks.cam.ac.uk
CONTACT:Annabelle Scott
DESCRIPTION:To aid climate policy decisions\, robust\, accurate and compre
 hensive Earth system models are needed. Earth system models are large nume
 rical models of the atmosphere\, ocean and other components which describe
  different environments of our planet such as the atmosphere\, ocean\, etc
 . These models provide quantitative treatment of the interactions within t
 he climate system and give the necessary understanding of both the drivers
  and responses to future climate change. Modelling aerosol as part of the 
 Earth system has been identified as the largest source of uncertainty in E
 arth's energy budget calculation due to the complex chemical reactions the
 y undergo and their interaction with clouds. This work investigates how ae
 rosols affect the climate under changing human emissions. This is importan
 t because human emissions change the atmosphere constituents\, modifying a
 erosol production\, which in turn affects the climate. \n\nUnderstanding t
 he link between anthropogenic emissions and radiative forcing remains a ch
 allenge in climate research. Linkages arise between emissions\, atmospheri
 c chemistry and climate through the formation of secondary aerosols such a
 s sulfate\, nitrate and organic aerosols. Sulfur dioxide (SO2) is an impor
 tant aerosol precursor with the largest sources coming from anthropogenic 
 activity. The lifetime of SO2 is short\, and a principal sink is the conve
 rsion to sulfate via oxidation.  Unlike well-mixed greenhouse gases\, anth
 ropogenic aerosols are heterogeneously distributed because of localised em
 issions and the short atmospheric residence time. Thus SO2 conversion to a
 erosol is important to aerosol distribution reflecting both its emission l
 ocation and the locally available oxidants\; both of which are changing ra
 pidly and disparately with time.\n\nThis work uses the UKESM1 to investiga
 te the modelled response of sulfate aerosol properties and cloud propertie
 s to emissions increases and oxidant changes over the period 1850-2014. Fr
 om an analysis of the CMIP6 and AerChemMIP experiments\, we show that ther
 e have been significant changes in the atmospheric oxidation processes of 
 SO2 over this period with consequences for the calculated radiative forcin
 g. Ultimately\, this work contributes to the improvement of our process-le
 vel understanding of Earth system models that interactively simulate aeros
 ol from precursors and aims to improve the accuracy of aerosol radiative f
 orcing predictions.
LOCATION:Drum Building\, Madingley Rise Site\, West Cambridge and on zoom:
   https://zoom.us/j/6708259482?pwd=Qk03U3hxZWNJZUZpT2pVZnFtU2RRUT09
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