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000005758 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000005758 1001_ $$0P:(DE-HGF)0$$aRollins, A. W.$$b0
000005758 245__ $$aIsoprene oxidation by nitrate radical: alkyl nitrate and secondary organic aerosol yields
000005758 260__ $$aKatlenburg-Lindau$$bEGU$$c2009
000005758 300__ $$a6685 - 6703
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000005758 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v9$$x1680-7316
000005758 500__ $$aThe Berkeley authors were supported by NSF ATM-0639847 and NSF ATM-0511829. The authors would like to thank the SAPHIR NO<INF>3</INF> intercomparison campaign team for organizing and administering the experiments in June 2007 at Forschungszentrum Julich. This work was a joint activity of the European Community Network of Excellence ACCENT, grant no. GOCE CT-2004-505337 and the EUROCHAMP project.
000005758 520__ $$aAlkyl nitrates and secondary organic aerosol (SOA) produced during the oxidation of isoprene by nitrate radicals has been observed in the SAPHIR ( Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) chamber. A 16 h dark experiment was conducted with temperatures at 289-301 K, and maximum concentrations of 11 ppb isoprene, 62.4 ppb O-3 and 31.1 ppb NOX. We find the yield of nitrates is 70 +/- 8% from the isoprene + NO3 reaction, and the yield for secondary dinitrates produced in the reaction of primary isoprene nitrates with NO3 is 40 +/- 20%. We find an effective rate constant for reaction of NO3 with the group of first generation oxidation products to be 7 x 10(-14) molecule(-1) cm(3) s(-1). At the low total organic aerosol concentration in the chamber (max=0.52 mu g m(-3)) we observed a mass yield (Delta SOA mass/Delta isoprene mass) of 2% for the entire 16 h experiment. However a comparison of the timing of the observed SOA production to a box model simulation of first and second generation oxidation products shows that the yield from the first generation products was <0.7% while the further oxidation of the initial products leads to a yield of 14% ( defined as Delta SOA/Delta isoprene(2X) where Delta isoprene(2X) is the mass of isoprene which reacted twice with NO3). The SOA yield of 14% is consistent with equilibrium partitioning of highly functionalized C-5 products of isoprene oxidation.
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000005758 7001_ $$0P:(DE-Juel1)4528$$aKiendler-Scharr, A.$$b1$$uFZJ
000005758 7001_ $$0P:(DE-HGF)0$$aFry, J. L.$$b2
000005758 7001_ $$0P:(DE-Juel1)16306$$aBrauers, T.$$b3$$uFZJ
000005758 7001_ $$0P:(DE-HGF)0$$aBrown, S. S.$$b4
000005758 7001_ $$0P:(DE-Juel1)16317$$aDorn, H.-P.$$b5$$uFZJ
000005758 7001_ $$0P:(DE-HGF)0$$aDubé, W. P.$$b6
000005758 7001_ $$0P:(DE-Juel1)7363$$aFuchs, H.$$b7$$uFZJ
000005758 7001_ $$0P:(DE-Juel1)VDB66036$$aMensah, A.$$b8$$uFZJ
000005758 7001_ $$0P:(DE-Juel1)16346$$aMentel, T. F.$$b9$$uFZJ
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000005758 7001_ $$0P:(DE-HGF)0$$aWooldridge, P. J.$$b13
000005758 7001_ $$0P:(DE-HGF)0$$aCohen, R.C.$$b14
000005758 773__ $$0PERI:(DE-600)2069847-1$$gVol. 9, p. 6685 - 6703$$p6685 - 6703$$q9<6685 - 6703$$tAtmospheric chemistry and physics$$v9$$x1680-7316$$y2009
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