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Thin and Subvisible Cirrus and Contrails in a Subsaturated Environment : Volume 10, Issue 12 (22/12/2010)

By Kübbeler, M.

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Book Id: WPLBN0003977489
Format Type: PDF Article :
File Size: Pages 34
Reproduction Date: 2015

Title: Thin and Subvisible Cirrus and Contrails in a Subsaturated Environment : Volume 10, Issue 12 (22/12/2010)  
Author: Kübbeler, M.
Volume: Vol. 10, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Gayet, J., Meyer, J., Schiller, C., Krämer, M., Schumann, U., Voigt, C.,...Petzold, A. (2010). Thin and Subvisible Cirrus and Contrails in a Subsaturated Environment : Volume 10, Issue 12 (22/12/2010). Retrieved from http://ebooklibrary.org/


Description
Description: Forschungszentrum Jülich, Inst. for Energy and Climate Research, IEK-7, Jülich, Germany. 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.

Summary
Thin and subvisible cirrus and contrails in a subsaturated environment

Excerpt
Bunz, H., Benz, S., Gensch, I., and Krämer, M.: MAID: a model to simulate UT/LS aerosols and ice clouds, Environ. Res. Lett., 3, 035001, doi:10.1088/1748-9326/3/3/035001, 2008.; Burkhardt, U., Kärcher, B., and Schumann, U.: Global modeling of the contrail and contrail cirrus climate impact, B. Am. Meteorol. Soc., 91, 479–484, doi:10.1175/2009BAMS2656.1, 2010.; DeMott, P. J., Cziczo, D., Prenni, A., Murphy, D., Kreidenweis, S., Thomson, D., Borys, R., and Rogers, D.: Measurements of the concentration and composition of nuclei for cirrus formation, P. Natl. Acad. Sci. USA, 100, 14655–14660, 2003.; DeMott, P. J., Prenni, A. J., Liu, X., Kreidenweis, S. M., Petters, M. D., Twohy, C. H., Richardson, M. S., Eidhammer, T., and Rogers, D. C.: Predicting global atmospheric ice nuclei distributions and their impacts on climate, P. Natl. Acad. Sci. USA, 107, 11217–11222, doi:10.1073/pnas.0910818107, 2010.; Febvre, G., Gayet, J.-F., Minikin, A., Schlager, H., Shcherbakov, V., Jourdan, O., Busen, R., Fiebig, M., Kärcher, B., and Schumann, U.: On optical and microphysical characteristics of contrails and cirrus, J. Geophys. Res., 114, D02204, doi:10.1029/2008JD010184, 2009.; Koop, T.: Homogeneous ice nucleation in water and aqueous solutions, Z. Phys. Chem., 218, 1231–1258, 2004.; Forster, P. and Rogers, H.: Metrics for comparison of climate impacts from well mixed greenhouse gases and inhomogeneous forcing such as those from UT/LS ozone, contrails and contrail cirrus, Aviation Climate Change Research Initiative (ACCRI), http://www.faa.gov/about/office_org/headqua, 1–57, 2008.; Gayet, J.-F., Asano, S., Yamazaki, A., Uchiyama, A., Sinyuk, A., Jourdan, O., and Auriol, F.: Two case studies of winter continental-type water and mixed-phase stratocumuli over the sea 1. Microphysical and optical properties, J. Geophys. Res., 107, 4569, doi:10.1029/2001JD001106, 2002.; Gensch, I., Bunz, H., Baumgardner, D., Christensen, L., Fahey, D., Hermann, R., Lawson, P., Popp, P., Smith, J., Webster, C., Weinstock, E., Wilson, J., Peter, T., and Krämer, M.: Supersaturations, microphysics and nitric acid partitioning in a cold cirrus observed during CR-AVE 2006: an observation-modeling intercomparison study., Environ. Res. Lett., 3, 035003, doi:10.1088/1748-9326/3/3/035003, 2008.; Gettelman, A., Fetzer, E., Eldering, A., and Irion, F.: The global distribution of supersaturation in the upper troposphere from the atmospheric infrared sounder, J. Climate, 19, 6089–6103, 2006.; Gierens, K. and Spichtinger, P.: On the size distribution of ice-supersaturated regions in the upper troposphere and lowermost stratosphere, Ann. Geophys., 18, 499–504, doi:10.1007/s00585-000-0499-7, 2000.; Gierens, K., Schumann, U., Helten, M., Smit, H., and Marenco, A.: A&

 

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