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Nat Commun

Title:		Chemistry-driven changes strongly influence climate forcing from vegetation emissions
Author(s):		Weber J; Archer-Nicholls S; Abraham NL; Shin YM; Griffiths P; Grosvenor DP; Scott CE; Archibald AT;
Address:		"Centre for Atmospheric Science, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK. j.weber@sheffield.ac.uk. School of Biosciences, University of Sheffield, Sheffield, S10 2TN, UK. j.weber@sheffield.ac.uk. Centre for Atmospheric Science, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK. Research IT, University of Manchester, Manchester, M13 9PL, UK. National Centre for Atmospheric Science, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK. Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK. School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK"
Journal Title:		Nat Commun
Year:		2022
Volume:		20221123
Issue:		1
Page Number:		7202 -
DOI:		10.1038/s41467-022-34944-9
ISSN/ISBN:		2041-1723 (Electronic) 2041-1723 (Linking)
Abstract:		"Biogenic volatile organic compounds (BVOCs) affect climate via changes to aerosols, aerosol-cloud interactions (ACI), ozone and methane. BVOCs exhibit dependence on climate (causing a feedback) and land use but there remains uncertainty in their net climatic impact. One factor is the description of BVOC chemistry. Here, using the earth-system model UKESM1, we quantify chemistry's influence by comparing the response to doubling BVOC emissions in the pre-industrial with standard and state-of-science chemistry. The net forcing (feedback) is positive: ozone and methane increases and ACI changes outweigh enhanced aerosol scattering. Contrary to prior studies, the ACI response is driven by cloud droplet number concentration (CDNC) reductions from suppression of gas-phase SO(2) oxidation. With state-of-science chemistry the feedback is 43% smaller as lower oxidant depletion yields smaller methane increases and CDNC decreases. This illustrates chemistry's significant influence on BVOC's climatic impact and the more complex pathways by which BVOCs influence climate than currently recognised"
Keywords:		"*Ozone Earth, Planet Industry Methane Oxidants *Volatile Organic Compounds;"
Notes:		"MedlineWeber, James Archer-Nicholls, Scott Abraham, Nathan Luke Shin, Youngsub Matthew Griffiths, Paul Grosvenor, Daniel P Scott, Catherine E Archibald, Alex T eng Research Support, Non-U.S. Gov't England 2022/11/24 Nat Commun. 2022 Nov 23; 13(1):7202. doi: 10.1038/s41467-022-34944-9"