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000852463 0247_ $$2doi$$a10.5194/acp-2018-232
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000852463 1001_ $$00000-0003-4413-8266$$aSchulz, Christiane$$b0$$eCorresponding author
000852463 245__ $$aAircraft-based observations of isoprene epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region
000852463 260__ $$aKatlenburg-Lindau$$bEGU$$c2018
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000852463 520__ $$aDuring the ACRIDICON-CHUVA field project (September–October 2014; based in Manaus, Brazil) aircraft-based in-situ measurements of aerosol chemical composition were conducted in the tropical troposphere over the Amazon using the High Altitude and Long Range Research Aircraft (HALO), covering altitudes from the boundary layer height up to 14.4km. The submicron non-refractory aerosol was characterized by flash-vaporization/electron impact-ionization aerosol particle mass spectrometry. The results show that significant secondary organic aerosol (SOA) formation by isoprene oxidation products occurs in the upper troposphere, leading to increased organic aerosol mass concentrations above 10km altitude. The median organic mass concentrations in the upper troposphere above 10km range between 1.0 and 2.1μgm−3 (referring to standard temperature and pressure; STP) with interquartile ranges of 0.6 to 3.0μgm−3 (STP), representing 70% of the total submicron non-refractory aerosol particle mass. The presence of isoprene epoxydiol-derived isoprene secondary organic aerosol (IEPOX-SOA) was confirmed by marker peaks in the mass spectra. We estimate the contribution of IEPOX-SOA to the total organic aerosol in the upper troposphere to be about 20%. After isoprene emission from vegetation, oxidation processes occur at low altitudes and/or during transport to higher altitudes, which may lead to the formation of IEPOX (one oxidation product of isoprene). Reactive uptake or condensation of IEPOX on pre-existing particles leads to IEPOX-SOA formation and subsequently increasing organic mass in the upper troposphere. This organic mass increase was accompanied by an increase of the nitrate mass concentrations, most likely due to NOx production by lightning. We further found that the ammonium contained in the aerosol particles is not sufficient to neutralize the particulate sulfate and nitrate. Analysis of the ion ratio of NO+ to NO2+ indicated that nitrate in the upper troposphere exists mainly in the form of organic nitrate. IEPOX-SOA and organic nitrates are coincident with each other, indicating that IEPOX-SOA forms in the upper troposphere either on acidic nitrate particles forming organic nitrates derived from IEPOX or on already neutralized organic nitrate aerosol particles.
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000852463 7001_ $$00000-0001-7169-3973$$aSchneider, Johannes$$b1
000852463 7001_ $$0P:(DE-HGF)0$$aAmorim Holanda, Bruna$$b2
000852463 7001_ $$0P:(DE-HGF)0$$aAppel, Oliver$$b3
000852463 7001_ $$0P:(DE-Juel1)156523$$aCosta, Anja$$b4
000852463 7001_ $$0P:(DE-HGF)0$$ade Sá, Suzane S.$$b5
000852463 7001_ $$0P:(DE-HGF)0$$aDreiling, Volker$$b6
000852463 7001_ $$0P:(DE-HGF)0$$aFütterer, Daniel$$b7
000852463 7001_ $$0P:(DE-HGF)0$$aJurkat-Witschas, Tina$$b8
000852463 7001_ $$0P:(DE-HGF)0$$aKlimach, Thomas$$b9
000852463 7001_ $$0P:(DE-Juel1)129131$$aKrämer, Martina$$b10
000852463 7001_ $$0P:(DE-HGF)0$$aMartin, Scot T.$$b11
000852463 7001_ $$0P:(DE-HGF)0$$aMertes, Stephan$$b12
000852463 7001_ $$0P:(DE-HGF)0$$aPöhlker, Mira L.$$b13
000852463 7001_ $$00000-0002-0317-5063$$aSauer, Daniel$$b14
000852463 7001_ $$00000-0001-8925-7731$$aVoigt, Christiane$$b15
000852463 7001_ $$00000-0003-4555-5686$$aWeinzierl, Bernadett$$b16
000852463 7001_ $$00000-0001-5483-5669$$aZiereis, Helmut$$b17
000852463 7001_ $$0P:(DE-HGF)0$$aZöger, Martin$$b18
000852463 7001_ $$00000-0003-1968-7925$$aAndreae, Meinrat O.$$b19
000852463 7001_ $$00000-0001-7754-3036$$aArtaxo, Paulo$$b20
000852463 7001_ $$0P:(DE-HGF)0$$aMachado, Luiz A. T.$$b21
000852463 7001_ $$00000-0003-1412-3557$$aPöschl, Ulrich$$b22
000852463 7001_ $$00000-0002-4652-5561$$aWendisch, Manfred$$b23
000852463 7001_ $$0P:(DE-HGF)0$$aBorrmann, Stephan$$b24
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