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SUMMARY:Chemistry–climate feedback of atmospheric methane in a methane-e
 mission-flux-driven chemistry–climate model - Dr Laura Stecher\, Univers
 ity of Cambridge
DTSTART:20251007T100000Z
DTEND:20251007T110000Z
UID:TALK237427@talks.cam.ac.uk
CONTACT:Yao Ge
DESCRIPTION:Biography: \nAfter completing a BSc in Physics (minor in Mete
 orology) and MSc in Meteorology at Ludwig-Maximilians-Universität Munich\
 , Laura pursued a PhD on "The role of methane for chemistry-climate intera
 ctions" at the German Aerospace Center\, Institute of Atmospheric Physics\
 , where Laura remained for a year as post-doctoral researcher. In April 20
 25\, Laura joined the University of Cambridge as Research Associate to wor
 k on the FETCH4 project - an international collaboration focusing on a bet
 ter understanding of the methane cycle.\n\nAbstract:\nMethane (CH₄)\, th
 e second most important greenhouse gas directly emitted by human activity\
 , is removed from the atmosphere through chemical decomposition\, which de
 pends on temperature and atmospheric composition.\nThis seminar examines h
 ow changes in the chemical sink under a warming climate feed back on atmos
 pheric CH₄ using a CH₄-emission-driven setup of the chemistry–climat
 e model EMAC. This approach allows CH₄ mixing ratios to evolve explicitl
 y in response to changes in emissions\, climate\, and atmospheric chemistr
 y. Results from perturbation simulations driven either by increased CO₂ 
 concentrations or by increased CH₄ emissions will be presented.\n\nIncre
 asing CH₄ emissions leads to a substantial rise in CH₄ mixing ratios. 
 Remarkably\, the factor by which CH₄ mixing ratios increase exceeds the 
 factor of the emission increase\, due to the extended atmospheric lifetime
  of CH₄. In contrast\, the individual effect of global warming is to sho
 rten CH₄’s lifetime\, thereby reducing its mixing ratios. The explicit
  evolution of CH₄ mixing ratio also enables secondary chemical feedbacks
  on the hydroxyl radical (OH) and tropospheric ozone (O₃).
LOCATION:Chemistry Dept\, Unilever Lecture Theatre and Teams
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