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000902274 0247_ $$2doi$$a10.5194/egusphere-egu21-10203
000902274 0247_ $$2Handle$$a2128/28921
000902274 037__ $$aFZJ-2021-04137
000902274 1001_ $$0P:(DE-Juel1)173788$$aRosanka, Simon$$b0$$eCorresponding author
000902274 1112_ $$aEGU General Assembly 2021$$cOnline$$d2021-04-19 - 2021-04-30$$w 
000902274 245__ $$aOrganic pollutants from Indonesian peatland fires: regional influences and its impact on lower the stratospheric composition
000902274 260__ $$c2021
000902274 3367_ $$033$$2EndNote$$aConference Paper
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000902274 520__ $$a<p>In 2015, the particularly strong dry season in Indonesia, caused by an exceptional strong El Ni&#241;o, led to severe peatland fires. Due to the high carbon content of peatland, these fires are characterised by high volatile organic compound (VOC) biomass burning emissions. The resulting primary and secondary pollutants are efficiently transported to the upper troposphere/lower stratosphere (UTLS) by the developing Asian monsoon anticyclone (ASMA) and the general upward transport in the intertropical convergence zone (ITCZ). In this study, we assess the importance of these VOC emissions for the composition of the lower troposphere and the UTLS by performing multiple chemistry simulations using the global atmospheric model ECHAM/MESSy (EMAC). In a first step, we find that EMAC properly captures the exceptional strength of the Indonesian fires based on the comparison of modelled columns of the biomass burning marker hydrogen cyanide (HCN) to spaceborne measurements from the Infrared Atmospheric Sounding Interferometer (IASI). In the lower troposphere, the increase in VOC levels is higher in Indonesia compared to other biomass burning regions. This directly impacts the oxidation capacity and leads to a high reduction in hydroxyl radicals (OH) and nitrogen oxides (NO<sub>x</sub>). In general, an increase in ozone (O<sub>3</sub>) is predicted close to the peatland fires. However, particular high concentrations of phenols lead to an O<sub>3</sub> depletion in eastern Indonesia. By employing the detailed in-cloud OVOC oxidation scheme J&#252;lich Aqueous-phase Mechanism of Organic Chemistry (JAMOC), we find that the predicted changes are dampened and that by ignoring these processes, global models tend to overestimate the impact of such extreme pollution events. The upward transport in the ASMA and the ITCZ leads to elevated VOC concentrations in the UTLS region. This also results in a depletion of lower stratospheric O<sub>3</sub>. We find that this is caused by a high destruction of O<sub>3</sub> by phenoxy radicals and by the increased formation of NO<sub>x</sub> reservoir species, which dampen the chemical production of O<sub>3</sub>.</p>
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000902274 7001_ $$0P:(DE-Juel1)168550$$aFranco, Bruno$$b1
000902274 7001_ $$00000-0002-8805-2141$$aClarisse, Lieven$$b2
000902274 7001_ $$0P:(DE-HGF)0$$aCoheur, Pierre-François$$b3
000902274 7001_ $$0P:(DE-Juel1)16324$$aWahner, Andreas$$b4
000902274 7001_ $$0P:(DE-Juel1)167439$$aTaraborrelli, Domenico$$b5
000902274 773__ $$a10.5194/egusphere-egu21-10203
000902274 8564_ $$uhttps://juser.fz-juelich.de/record/902274/files/EGU21-10203-print.pdf$$yOpenAccess
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000902274 9141_ $$y2021
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