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000002084 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000002084 1001_ $$0P:(DE-HGF)0$$aWiedensohler, A.$$b0
000002084 245__ $$aRapid aerosol particle growth and increase of cloud condensation nucleus activity by secondary aerosol formation and condensation: A case study for regional air pollution in northeastern China
000002084 260__ $$aWashington, DC$$bUnion$$c2009
000002084 300__ $$a1 - 13
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000002084 440_0 $$06393$$aJournal of Geophysical Research D: Atmospheres$$v114$$x0148-0227$$yD00G08
000002084 500__ $$aThis work as part of CAREBeijing-2006 (Campaigns of Air Quality Research in Beijing 2006) were mainly supported by Beijing Council of Science and Technology (HB200504-6 and HB200504-2). The authors wish to extend their gratitude to all participants for their good humor, enthusiasm, and openness to collaboration in the field measurements at the Yufa site and in the data evaluation. S. S. G., D. R., H. S., and U. P. thank M.O. Andreae and the Max Planck Society for support.
000002084 520__ $$aThis study was part of the international field measurement Campaigns of Air Quality Research in Beijing and Surrounding Region 2006 (CAREBeijing-2006). We investigated a new particle formation event in a highly polluted air mass at a regional site south of the megacity Beijing and its impact on the abundance and properties of cloud condensation nuclei (CCN). During the 1-month observation, particle nucleation followed by significant particle growth on a regional scale was observed frequently (similar to 30%), and we chose 23 August 2006 as a representative case study. Secondary aerosol mass was produced continuously, with sulfate, ammonium, and organics as major components. The aerosol mass growth rate was on average 19 mu g m(-3) h(-1) during the late hours of the day. This growth rate was observed several times during the 1-month intensive measurements. The nucleation mode grew very quickly into the size range of CCN, and the CCN size distribution was dominated by the growing nucleation mode ( up to 80% of the total CCN number concentration) and not as usual by the accumulation mode. At water vapor supersaturations of 0.07-0.86%, the CCN number concentrations reached maximum values of 4000-19,000 cm(-3) only 6-14 h after the nucleation event. During particle formation and growth, the effective hygroscopicity parameter kappa increased from about 0.1-0.3 to 0.35-0.5 for particles with diameters of 40-90 nm, but it remained nearly constant at similar to 0.45 for particles with diameters of similar to 190 nm. This result is consistent with aerosol chemical composition data, showing a pronounced increase of sulfate.
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000002084 7001_ $$0P:(DE-HGF)0$$aCheng, Y.F.$$b1
000002084 7001_ $$0P:(DE-HGF)0$$aNowak, A.$$b2
000002084 7001_ $$0P:(DE-HGF)0$$aWehner, B.$$b3
000002084 7001_ $$0P:(DE-HGF)0$$aAchtert, P.$$b4
000002084 7001_ $$0P:(DE-HGF)0$$aBerghof, M.$$b5
000002084 7001_ $$0P:(DE-HGF)0$$aBirmili, Z.$$b6
000002084 7001_ $$0P:(DE-HGF)0$$aWu, J.$$b7
000002084 7001_ $$0P:(DE-HGF)0$$aHu, M.$$b8
000002084 7001_ $$0P:(DE-HGF)0$$aZhu, T.$$b9
000002084 7001_ $$0P:(DE-HGF)0$$aTakegawa, N.$$b10
000002084 7001_ $$0P:(DE-HGF)0$$aKita, K.$$b11
000002084 7001_ $$0P:(DE-HGF)0$$aKondo, Y.$$b12
000002084 7001_ $$0P:(DE-Juel1)VDB81049$$aLou, S.R.$$b13$$uFZJ
000002084 7001_ $$0P:(DE-Juel1)16326$$aHofzumahaus, A.$$b14$$uFZJ
000002084 7001_ $$0P:(DE-Juel1)16342$$aHolland, F.$$b15$$uFZJ
000002084 7001_ $$0P:(DE-Juel1)16324$$aWahner, A.$$b16$$uFZJ
000002084 7001_ $$0P:(DE-HGF)0$$aGunthe, S.S.$$b17
000002084 7001_ $$0P:(DE-HGF)0$$aRose, D.$$b18
000002084 7001_ $$0P:(DE-HGF)0$$aSu, H.$$b19
000002084 7001_ $$0P:(DE-HGF)0$$aPöschl, U.$$b20
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