The Role of Natural Halogens in Global Tropospheric Ozone Chemistry and Budget Under Different 21st Century Climate Scenarios
Badia, Alba (Instituto de Química Física "Rocasolano")
Iglesias-Suarez, Fernando (Instituto de Química Física "Rocasolano")
Fernandez, Rafael Pedro (Instituto de Química Física "Rocasolano")
Cuevas Rodríguez, Carlos Alberto (Instituto de Química Física "Rocasolano")
Kinnison, Douglas E. (National Center for Atmospheric Research)
Lamarque, Jean Francois (National Center for Atmospheric Research)
Griffiths, Paul T. (Cambridge University. National Centre for Atmospheric Science)
Tarasick, David W. (Environment and Climate Change Canada)
Liu, Jane (University of Toronto. Department of Geography and Planning)
Saiz-Lopez, Alfonso (Instituto de Química Física "Rocasolano")

Data:	2021
Resum:	Tropospheric ozone (O3) is an important greenhouse gas and a surface pollutant. The future evolution of (O3) abundances and chemical processing are uncertain due to a changing climate, socioeconomic developments, and missing chemistry in global models. Here, we use an Earth System Model with natural halogen chemistry to investigate the changes in the (O3) budget over the 21st century following Representative Concentration Pathway (RCP)6. 0 and RCP8. 5 climate scenarios. Our results indicate that the global tropospheric (O3) net chemical change (NCC, chemical gross production minus destruction) will decrease (~50%), notwithstanding increasing or decreasing trends in ozone production and loss. However, a wide range of surface NCC variations (from -60% to 150%) are projected over polluted regions with stringent abatements in (O3) precursor emissions. Water vapor and iodine are found to be key drivers of future tropospheric (O3) destruction, while the largest changes in (O3) production are determined by the future evolution of peroxy radicals. We show that natural halogens, currently not considered in climate models, significantly impact on the present-day and future global (O3) burden reducing ~30-35 Tg (11-15%) of tropospheric ozone throughout the 21st century regardless of the RCP scenario considered. This highlights the importance of including natural halogen chemistry in climate model projections of future tropospheric ozone.
Ajuts:	European Commission 726349
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Chemistry ; Climate ; Emission ; Halogens ; Ozone ; SDG 13 - Climate Action
Publicat a:	Journal of Geophysical Research. Atmospheres, Vol. 126, Issue 20 (October 2021) , art. e2021JD034859, ISSN 2169-8996

DOI: 10.1029/2021JD034859

25 p, 11.5 MB

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