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Modelling of Cirrus Clouds – Part 2: Competition of Different Nucleation Mechanisms : Volume 9, Issue 7 (01/04/2009)

By Spichtinger, P.

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Book Id: WPLBN0003991265
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Modelling of Cirrus Clouds – Part 2: Competition of Different Nucleation Mechanisms : Volume 9, Issue 7 (01/04/2009)  
Author: Spichtinger, P.
Volume: Vol. 9, Issue 7
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Gierens, K. M., & Spichtinger, P. (2009). Modelling of Cirrus Clouds – Part 2: Competition of Different Nucleation Mechanisms : Volume 9, Issue 7 (01/04/2009). Retrieved from http://community.ebooklibrary.org/


Description
Description: Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland. We study the competition of two different freezing mechanisms (homogeneous and heterogeneous freezing) in the same environment for cold cirrus clouds. To this goal we use the recently developed and validated ice microphysics scheme (Spichtinger and Gierens, 2009a) which distinguishes between ice classes according to their formation process. We investigate cases with purely homogeneous ice formation and compare them with cases where background ice nuclei in varying concentration heterogeneously form ice prior to homogeneous nucleation. We perform additionally a couple of sensitivity studies regarding threshold humidity for heterogeneous freezing, uplift speed, and ambient temperature, and we study the influence of random motions induced by temperature fluctuations in the clouds. We find three types of cloud evolution, homogeneously dominated, heterogeneously dominated, and a mixed type where neither nucleation process dominates. The latter case is prone to long–lasting in–cloud ice supersaturation of the order 30% and more.

Summary
Modelling of cirrus clouds – Part 2: Competition of different nucleation mechanisms

Excerpt
Haag, W. and Kärcher, B.: The impact of aerosols and gravity waves on cirrus clouds at midlatitudes. J. Geophys. Res., 109, D12202, doi:10.1029/2004JD00457, 2004.; Heymsfield, A. and Iaquinta, J.: Cirrus crystal terminal velocities, J. Atmos. Sci., 57, 916–938, 2000.; Fusina, F., Spichtinger, P. Lohmann, U.: The impact of ice supersaturated regions and thin cirrus on radiation in the mid latitudes, J. Geophys. Res., D24S14, doi:10.1029/2007JD008449, 2007.; Gierens, K., Schumann, U., Helten, M. Smit, H., and Marenco, A.: A distribution law for relative humidity in the upper troposphere and lower stratosphere derived from three years of MOZAIC measurements, Ann. Geophys., 17, 1218–1226, 1999.; Grabowski, W. and Smolarkiewicz, P.: A multiscale anelastic model for meteorological research, 5 Mon. Weather Rev., 130, 939–956, 2002.; Barahona, D. and Nenes, A.: Parameterization of cirrus formation in large scale models: Homogeneous nucleation, J. Geophys. Res., 113, doi:10.1029/2007JD009355, 2008.; Chen, T., Rossow, W. B., and Zhang, Y.: Radiative Effects of Cloud-Type Variations, J. Climate, 13, 264–286, 2000.; Clark, T. and Farley, R.: Severe downslope windstorm calculations in two and three spatial dimensions using anelastic interactive grid nesting: A possible mechanism for gustiness, J. Atmos. Sci., 41, 329–350, 1984.; DeMott, P. J., Rogers, D. C., and Kreidenweis, S. M.: The susceptibility of ice formation in upper tropospheric clouds to insolu- ble aerosol components, J. Geophys. Res., 102, 19575–19584, 1997.; DeMott, P. D., Cziczo, A., Prenni, D., Murphy, S., Kreidenweis, D., Thomson, R., Borys, D., and Rogers, D. C.: Measurements of the concentration and composition of nuclei for cirrus formation, Proc. Nat. Acad. Sciences, 100, 14655–14660, 2003.; Emanuel, K.: Atmospheric convection, Oxford University Press, 580 pp., 1994.; Gierens, K.: On the transition between heterogeneous and homogeneous freezing, Atmos. Chem. Phys., 3, 437–446, 2003; Heymsfield, A. J. and Sabin, R. M.: Cirrus crystal nucleation by homogeneous freezing of solution droplets, J. Atmos. Sci., 46, 2252–2264, 1989.; Kajikawa, M. and Heymsfield, A.: Aggregation of ice crystals, J. Atmos. Sci., 46, 3108–3121, 1989.; Kärcher, B. and Lohmann, U.: A Parameterization of cirrus cloud formation: Homogeneous freezing of supercooled aerosols, J. Geophys. Res., 107(D2), 4010, doi:10.1029/2001JD000470, 2002.; Kärcher, B. and Ström, J.: The roles of dynamical variability and aerosols in cirrus cloud formation, Atmos. Chem. Phys., 3, 823–838, 2003.; Kärcher, B. and Koop, T.: The role of organic aerosols in homogeneous ice formation, Atmos. Chem. Phys., 5, 703–714, 2005.; Kärcher, B., Hendricks, J., and Lohmann, U.: Physically based parameterization of cirrus cloud formation for use in global atmospheric models, J. Geophys. Res. 111, doi:10.1029/2005JD006219, 2006.; Koenig, L.: Numerical modeling of ice deposition, J. Atmos. Sci., 28, 226–237, 1971.; Korolev, A. and Mazin, I.: Supersaturation of Water Vapor in Clouds, J. Atmos. Sci., 60, 2957–2974, 2003.; Koop, T.: Homogeneous ice nucleation in water and aqueous solutions, Z. Phys. Chem. 218, 1231–1258, 2004.; Koop, T., Luo, B., Tsias, A., and Peter, T.: Water activity as the determinant for homogeneous ice nucleation in aqueous solutions, Nature 406, 611–614, 2000.; Liu, X. and Penner, J. E.: Ice nucleation parameterization for global models, Meteor. Z., 14, 499–514, 2005.; Khvorostyanov, V. and Curry, J.: The Theory of Ice Nucleation by Heterogeneous Freezing of Deliquescent Mixed CCN. Part II: Parcel Model Simulation, J. Atmos. Sci., 62, 261–285, 2005.; Khvorostyanov, V., Morrison, H., Curry, J. A., Baumgardner, D., and Lawson, P.: High supersaturation and modes of ice nucleation in thin tropopause cirrus: Simulation of the 13 July 2002 Cirrus Regional Study of Tropical Anvils and Cirrus Layers case, J. Geophys. Res., 111, D02201, doi:10.1029/2004JD005235, 2006.; Mace, G. G., Benson, S., and Vernon, E.: Cirrus Clouds an

 

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