Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
  • CiteScore value: 6.13 CiteScore
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Volume 11, issue 12
Atmos. Chem. Phys., 11, 5853-5865, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 11, 5853-5865, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 22 Jun 2011

Research article | 22 Jun 2011

Thin and subvisible cirrus and contrails in a subsaturated environment

M. Kübbeler1,5, M. Hildebrandt1,6, J. Meyer1, C. Schiller1, Th. Hamburger2, T. Jurkat2, A. Minikin2, A. Petzold2, M. Rautenhaus2, H. Schlager2, U. Schumann2, C. Voigt2,3, P. Spichtinger3, J.-F. Gayet4, C. Gourbeyre4, and M. Krämer1 M. Kübbeler et al.
  • 1Forschungszentrum Jülich, Inst. for Energy and Climate Research, IEK-7, Jülich, Germany
  • 2DLR Oberpfaffenhofen, Inst. Atmos. Physics, Weßling, Germany
  • 3Univ. Mainz, Inst. Atmos. Physics, Mainz, Germany
  • 4Univ. Blaise Pascal, LaMP, Clermont-Ferrand, France
  • 5now at: ETH Zürich, Inst. Atmos. & Climate, Zürich, Switzerland
  • 6now at: IUTA, Air Quality Dep., Duisburg, Germany

Abstract. The frequency of occurrence of cirrus clouds and contrails, their life time, ice crystal size spectra and thus their radiative properties depend strongly on the ambient distribution of the relative humidity with respect to ice (RHice). Ice clouds do not form below a certain supersaturation and both cirrus and contrails need at least saturation conditions to persist over a longer period. Under subsaturated conditions, cirrus and contrails should dissipate. During the mid-latitude aircraft experiment CONCERT 2008 (CONtrail and Cirrus ExpeRimenT), RHice and ice crystals were measured in cirrus and contrails. Here, we present results from 2.3/1.7 h of observation in cirrus/contrails during 6 flights. Thin and subvisible cirrus with contrails embedded therein have been detected frequently in a subsaturated environment. Nevertheless, ice crystals up to radii of 50 μm and larger, but with low number densities were often observed inside the contrails as well as in the cirrus. Analysis of the meteorological situation indicates that the crystals in the contrails were entrained from the thin/subvisible cirrus clouds, which emerged in frontal systems with low updrafts. From model simulations of cirrus evaporation times it follows that such thin/subvisible cirrus can exist for time periods of a couple of hours and longer in a subsaturated environment and thus may represent a considerable part of the cirrus coverage.

Publications Copernicus