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000838696 0247_ $$2doi$$a10.5194/gmd-2017-244
000838696 0247_ $$2ISSN$$a1991-9611
000838696 0247_ $$2ISSN$$a1991-962X
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000838696 1001_ $$0P:(DE-Juel1)164575$$aStadtler, Scarlet$$b0
000838696 245__ $$aIsoprene derived secondary organic aerosol in a global aerosol chemistry climate model
000838696 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2017
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000838696 520__ $$aWithin the framework of the global chemistry climate model ECHAM-HAMMOZ a novel explicit coupling between the sectional aerosol model HAM-SALSA and the chemistry model MOZ was established to form isoprene derived secondary organic aerosol (iSOA). Isoprene oxidation in the chemistry model MOZ is described by a semi-explicit scheme consisting of 147 reactions, embedded in a detailed atmospheric chemical mechanism with a total of 779 reactions. Low volatile compounds (LVOC) produced during isoprene photooxidation are identified and explicitly partitioned by HAM-SALSA. A group contribution method was used to estimate their evaporation enthalpies and corresponding saturation vapor pressures, which are used by HAM-SALSA to calculate the saturation concentration of each LVOC. With this method, every single precursor is tracked in terms of condensation and evaporation in each aerosol size bin. This approach lead to the identification of ISOP(OOH)2 as a main contributor to iSOA formation. Further, reactive uptake of isoprene epoxidiols (IEPOX) and isoprene derived glyoxal were included as iSOA sources. The parameterization of IEPOX reactive uptake includes a dependency on aerosol pH value. This model framework connecting semi-explicit isoprene oxidation with explicit treatment of aerosol tracers leads to a global, annual isoprene SOA yield of 16 % relative to the primary oxidation of isoprene by OH, NO3, and ozone. With 445 Tg (392 TgC) isoprene emitted, an iSOA source of 148 Tg (61 TgC) is simulated. The major part of iSOA in ECHAM-HAMMOZ is produced by IEPOX (24.4 TgC) and ISOP(OOH)2 (28.3 TgC). The main sink process is particle wet deposition which removes 143 Tg (59 TgC). The iSOA burden reaches 1.6 Tg (0.7 TgC) in the year 2012.
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000838696 536__ $$0G:(DE-Juel1)HITEC-20170406$$aHITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406)$$cHITEC-20170406$$x2
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000838696 7001_ $$0P:(DE-HGF)0$$aKühn, Thomas$$b1
000838696 7001_ $$0P:(DE-Juel1)16212$$aSchröder, Sabine$$b2$$ufzj
000838696 7001_ $$0P:(DE-Juel1)167439$$aTaraborrelli, Domenico$$b3
000838696 7001_ $$0P:(DE-Juel1)6952$$aSchultz, Martin G.$$b4
000838696 7001_ $$0P:(DE-HGF)0$$aKokkola, Harri$$b5$$eCorresponding author
000838696 773__ $$0PERI:(DE-600)2456729-2$$a10.5194/gmd-2017-244$$gp. 1 - 35$$p1 - 35$$tGeoscientific model development discussions$$v244$$x1991-962X$$y2017
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