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Uptake of nitric acid in ice crystals in persistent contrails

Schäuble, D. and Voigt, C. and Kärcher, B. and Stock, P. and Schlager, H. and Krämer, M. and Schiller, C. and Bauer, R. and Spelten, N. and de Reus, M. and Szakáll, M. and Borrm, S. and Weers, U. and Peter, T. (2010) Uptake of nitric acid in ice crystals in persistent contrails. DLR.

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Official URL: http://www.pa.op.dlr.de/tac/proceedings.html


This is a short version of Schäuble et al. (2009) published in ACPD. In November 2006 cirrus clouds and almost 40 persistent contrails were probed with in situ instruments over Germany and Northern Europe during the CIRRUS-III campaign. At altitudes between 10 and 11.5 km and temperatures of 211 to 220 K contrails with ages up to 8 hours were detected. These contrails had a larger ice phase fraction of total nitric acid (HNO3,ice/HNO3,tot = 6 %) than the ambient cirrus layers (3 %). The differences in ice phase fractions between developing contrails and cirrus are likely caused by high plume concentrations of HNO3 prior to contrail formation and large ice crystal number densities in contrails. The observed decrease of nitric acid to water molar ratios in ice with increasing mean ice particle diameter suggests that ice-bound HNO3 concentrations are controlled by uptake of exhaust HNO3 in the freezing plume aerosol in young contrails and subsequent trapping of ambient HNO3 in growing ice particles in older (age > 1 h) contrails.

Document Type:Proceedings
Title:Uptake of nitric acid in ice crystals in persistent contrails
AuthorsInstitution or Email of Authors
Schäuble, D.DLR
Voigt, C.DLR
Kärcher, B.DLR
Stock, P.DLR
Schlager, H.DLR
Krämer, M.FZ Jülich, Jülich
Schiller, C.FZ Jülich, Jülich
Bauer, R.FZ Jülich, Jülich
Spelten, N.FZ Jülich, Jülich
de Reus, M.Johannes-Gutenberg Univ. Mainz, Mainz
Szakáll, M.Johannes-Gutenberg Univ. Mainz, Mainz
Borrm, S.Johannes-Gutenberg Univ. Mainz, Mainz
Weers, U.ETH Zürich, Zürich, CH
Peter, T.ETH Zürich, Zürich, CH
Number of Pages:6
Sausen, R.DLR
Keywords:Nitric acid, Partitioning, Uptake, Contrails, Cirrus
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:29 Dec 2011 15:24
Last Modified:29 Dec 2011 15:30

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