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Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region

Schulz, Christiane and Schneider, Johannes and Holanda, Bruna A. and Appel, Oliver and Costa, Anja and de Sa, Suzane S. and Dreiling, Volker and Futterer, Daniel and Jurkat-Witschas, Tina and Klimach, Thomas and Knote, Christoph and Krämer, Martina and Martin, Scot T. and Mertes, Stephan and Pöhlker, Mira L. and Sauer, Daniel and Voigt, Christiane and Walser, Adrian and Weinzierl, Bernadett and Ziereis, Helmut and Zöger, Martin and Andreae, Meinrat O. and Artaxo, Paulo and Machado, Luiz A. T. and Pöschl, Ulrich and Wendisch, Manfred and Borrmann, Stephan (2018) Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region. Atmospheric Chemistry and Physics (ACP), 18 (20), pp. 14979-15001. Copernicus Publications. DOI: 10.5194/acp-18-14979-2018 ISSN 1680-7316

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Official URL: https://doi.org/10.5194/acp-18-14979-2018


During 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 (BL) height up to 14.4 km. The submicron non-refractory aerosol was characterized by flashvaporization/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 (UT), leading to increased organic aerosol mass concentrations above 10 km altitude. The median organic mass concentrations in the UT above 10 km range between 1.0 and 2.5 µg m−3 (referring to standard temperature and pressure; STP) with interquartile ranges of 0.6 to 3.2 µg m−3 (STP), representing 78 % of the total submicron non-refractory aerosol particle mass. The presence of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) was confirmed by marker peaks in the mass spectra. We estimate the contribution of IEPOXSOA to the total organic aerosol in the UT 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 preexisting particles leads to IEPOX-SOA formation and subsequently increasing organic mass in the UT. This organic mass increase was accompanied by an increase in the nitrate mass concentrations, most likely due to Ox production by lightning. Analysis of the ion ratio of NOC to NOC2 indicated that nitrate in the UT 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 UT either on acidic nitrate particles forming organic nitrates derived from IEPOX or on already neutralized organic nitrate aerosol particles.

Item URL in elib:https://elib.dlr.de/123652/
Document Type:Article
Title:Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schulz, ChristianeMPI Chemie, MainzUNSPECIFIED
Schneider, JohannesMPI Chemie, MainzUNSPECIFIED
Holanda, Bruna A.MPI Chemie, MainzUNSPECIFIED
Appel, OliverMPI Chemie, MainzUNSPECIFIED
de Sa, Suzane S.Harvard Univ., Cambridge, MA, USAUNSPECIFIED
Jurkat-Witschas, TinaDLR, IPAUNSPECIFIED
Klimach, ThomasMPI Chemie, MainzUNSPECIFIED
Knote, ChristophLMU, MünchenUNSPECIFIED
Krämer, MartinaFZ Jülich, IEK7UNSPECIFIED
Martin, Scot T.Harvard Univ., Cambridge, MA, USAUNSPECIFIED
Mertes, StephanTROPOS, LeipzigUNSPECIFIED
Pöhlker, Mira L.MPI Chemie, MainzUNSPECIFIED
Walser, AdrianUniv. Wien, ÖsterreichUNSPECIFIED
Weinzierl, BernadettUniv. Wien, ÖsterreichUNSPECIFIED
Andreae, Meinrat O.MPI Chemie, MainzUNSPECIFIED
Artaxo, PauloUniv. SãoPaulo, BrasilienUNSPECIFIED
Machado, Luiz A. T.INPE, São José dos Campos, BrasilienUNSPECIFIED
Pöschl, UlrichMPI Chemie, MainzUNSPECIFIED
Wendisch, ManfredUniv. LeipzigUNSPECIFIED
Borrmann, StephanMPI Chemie, MainzUNSPECIFIED
Date:18 October 2018
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/acp-18-14979-2018
Page Range:pp. 14979-15001
Publisher:Copernicus Publications
Keywords:ACRIDICON, Aerosol, HALO
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Flight Experiments > Oberpfaffenhofen
Deposited By: Ziereis, Helmut
Deposited On:23 Nov 2018 13:53
Last Modified:02 May 2019 13:59

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