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SUMMARY:The role of chemistry and oxidants on the forcing from vegetation 
 emissions and the next steps for understanding the atmospheric composition
  changes and forcing from widespread tree planting - Dr James Weber (The U
 niversity of Sheffield)
DTSTART:20220516T130000Z
DTEND:20220516T140000Z
UID:TALK174488@talks.cam.ac.uk
CONTACT:104065
DESCRIPTION:Emissions of BVOCs affect climate via the formation of organic
  aerosols and their influence on cloud properties\, and via atmospheric ox
 idation changes influencing the greenhouse gases ozone and methane. BVOCs 
 also exhibit dependence on climate (leading to a feedback)\, and land use 
 change (including afforestation/reforestation as a CO2 removal strategy). 
 Despite recent scientific advances\, there remains considerable uncertaint
 y between model simulations in the net impact BVOCs have on climate. One c
 ontributor to this uncertainty is the description of BVOC chemistry\, hith
 erto minimally assessed in a climate context. To quantify the influence of
  chemistry\, the climate response to a doubling of BVOC emissions with the
  Strat-Trop and CRI-Strat 2 chemical mechanisms is compared. This comparis
 on illustrates the significant influence of chemistry\, via oxidant concen
 trations\, on gas and aerosol responses to BVOC emission changes and the m
 ore complex pathways by which BVOCs influence climate than are currently r
 ecognised.\n\nI will also discuss more recent work on developing an altern
 ative set of UKESM/iBVOC emission factors for isoprene and monoterpene. Th
 is aims to fix an oversimplification in the current approach and will have
  implications for the simulation of future changes in BVOC emissions.\n\nF
 inally\, I will present current and planned work looking at future BVOC em
 issions changes associated with a deforestation scenario (ssp370) and a sc
 enario considering widescale\, but plausible\, re/afforestation\, includin
 g experiments to assess the role of background climate on the impact of BV
 OC emission changes.   
LOCATION:https://us02web.zoom.us/j/88391274319?pwd=ZzhVaGtkYUtBTWdsQUR4dm5
 IWnprZz09
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