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Cosmic ray-induced aerosol-formation: First observational evidence from aircraft-based ion mass spectrometer measurements in the upper troposphere

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Eichkorn,  S.
Prof. Konrad Mauersberger, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Wilhelm,  S.
Frank Arnold - Atmospheric Trace Gases and Ions, Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Aufmhoff,  H.
Frank Arnold - Atmospheric Trace Gases and Ions, Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Wohlfrom,  K. H.
Frank Arnold - Atmospheric Trace Gases and Ions, Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Arnold,  F.
Frank Arnold - Atmospheric Trace Gases and Ions, Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Eichkorn, S., Wilhelm, S., Aufmhoff, H., Wohlfrom, K. H., & Arnold, F. (2002). Cosmic ray-induced aerosol-formation: First observational evidence from aircraft-based ion mass spectrometer measurements in the upper troposphere. Geophysical Research Letters, 29(14): 1698, pp. 1698-1698.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-82E8-6
Abstract
[1] Large positive cluster ions with atomic mass numbers up to 2500 have for the first time been detected in the upper troposphere using an aircraft-based large ion mass spectrometer (LIOMAS). Three ion families seem to be present (types 1, 2 and 3). Type 1 ions probably are H+BbWw (W is H2O and B is mostly acetone (CH3)(2)CO, and b less than or equal to 2). Type 2 ions are probably H(+)B(b)A(a)W(w) (A = H2SO4) formed by A- attachment to type 1 ions. Type 3 ions are probably very small charged aerosols formed preferably by type 1 ion attachment to stable electrically neutral A(x)W(y) clusters. The latter are preferably formed by ion-ion recombination. Hence our observations provide strong evidence for the ion-mediated formation and growth of aerosol particles in the upper troposphere.