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Heterogeneous nucleation of ice particles on glassy aerosols under cirrus conditions

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.

Full text not available from this repository.

Official URL: http://www.nature.com/ngeo/journal/v3/n4/abs/ngeo817.html

Abstract

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.

Document Type:Article
Title:Heterogeneous nucleation of ice particles on glassy aerosols under cirrus conditions
Authors:
AuthorsInstitution or Email of Authors
Murray, B.Uni Leeds, UK
Wilson, T.W.Uni Leeds, UK
Dobbie, S.Uni Leeds, UK
Cui, Z.Uni Leeds, UK
Al-Jumur, S.M.R.K.Uni Leeds, UK
Möhler, O.FZK-IMK
Schnaiter, M.FZK-IMK
Wagner, R.FZK-IMK
Benz, S.FZK-IMK
Niemand, M.FZK-IMK
Saathoff, H.FZK-IMK
Ebert, V.Uni Heidelberg
Wagner , S.Uni Heidelberg
Kärcher, B.DLR-IPA
Date:21 March 2010
Journal or Publication Title:Nature Geoscience
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:3
DOI:10.1038/NGEO817
Page Range:233-237
Status:Published
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
Location: Oberpfaffenhofen
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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