Murray, B. and Wilson, T.W. and Dobbie, S. and Cui, Z. and Al-Jumur, S.M.R.K. and Möhler, O. and Schnaiter, M. and Wagner, R. and Benz, S. and Niemand, M. and Saathoff, H. and Ebert, V. and Wagner , S. and Kärcher, B. (2010) Heterogeneous nucleation of ice particles on glassy aerosols under cirrus conditions. Nature Geoscience, 3, 233-237 . DOI: 10.1038/NGEO817.
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Ice clouds in the tropical tropopause layer play a key role in dehydrating air as it enters the stratosphere1, 2. However, in situ measurements show that water vapour within these clouds is unexpectedly supersaturated3, 4, 5; normally the growth of ice crystals rapidly quenches supersaturation3. The high in-cloud humidity may be related to the low number of ice crystals found in these clouds4, 6, but low ice number densities are inconsistent with standard models of cirrus cloud formation involving homogeneous freezing of liquid aerosols7. Aqueous aerosols rich in organic matter are ubiquitous in the atmosphere8, 9, and under cirrus conditions they are known to become glassy10, 11, that is, amorphous, non-crystalline solids. Here we report experiments in a cloud simulation chamber that demonstrate heterogeneous nucleation of ice on glassy solution droplets. Cirrus residues measured in situ showed ice nuclei rich in oxidized organic matter12, consistent with heterogeneous nucleation on glassy aerosols. In addition, using a one-dimensional cirrus model, we show that nucleation on glassy aerosols may explain low ice crystal numbers and high in-cloud humidity in the tropical tropopause layer. We propose that heterogeneous nucleation on glassy aerosols is an important mechanism for ice nucleation in the tropical tropopause layer.
|Title:||Heterogeneous nucleation of ice particles on glassy aerosols under cirrus conditions|
|Date:||21 March 2010|
|Journal or Publication Title:||Nature Geoscience|
|In ISI Web of Science:||Yes|
|Keywords:||cirrus clouds, ice nucleation, tropical tropopause|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||ATM and Operation|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AO - Air Traffic Management and Operation|
|DLR - Research theme (Project):||L - Climate, Weather and Environment|
|Institutes and Institutions:||Institute of Atmospheric Physics > Atmospheric Trace Species|
|Deposited By:||Prof. Bernd Kärcher|
|Deposited On:||26 May 2011 13:57|
|Last Modified:||26 Feb 2013 15:05|
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