<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE article SYSTEM "http://www.atmos-chem-phys.net/inc/acp/copernicus.dtd">
<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics</journal_title>
		<journal_url>www.atmos-chem-phys.net</journal_url>
		<issn>1680-7316</issn>
		<eissn>1680-7324</eissn>
		<volume_number>6</volume_number>
		<issue_number>11</issue_number>
		<publication_year>2006</publication_year>
	</journal>
	<doi>10.5194/acp-6-3611-2006</doi>
	<article_url>http://www.atmos-chem-phys.net/6/3611/2006/</article_url>
	<abstract_html>http://www.atmos-chem-phys.net/6/3611/2006/acp-6-3611-2006.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys.net/6/3611/2006/acp-6-3611-2006.pdf</fulltext_pdf>
	<start_page>3611</start_page>
	<end_page>3623</end_page>
	<publication_date>2006-09-06</publication_date>
	<article_title content_type="html">Liquid particle composition and heterogeneous reactions in a mountain wave Polar Stratospheric Cloud</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>D. Lowe</name>
		</author>
		<author numeration="2" affiliations="1">
			<name>A. R. MacKenzie</name>
		</author>
		<author numeration="3" affiliations="2">
			<name>H. Schlager</name>
		</author>
		<author numeration="4" affiliations="2">
			<name>C. Voigt</name>
		</author>
		<author numeration="5" affiliations="2">
			<name>A. Dörnbrack</name>
		</author>
		<author numeration="6" affiliations="3">
			<name>M. J. Mahoney</name>
		</author>
		<author numeration="7" affiliations="4">
			<name>F. Cairo</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Environmental Science Dept., Lancaster University, Lancaster, UK</affiliation>
		<affiliation numeration="2" content_type="html">Institute for Atmospheric Physics, DLR, Oberpfaffenhofen, Germany</affiliation>
		<affiliation numeration="3" content_type="html">Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA</affiliation>
		<affiliation numeration="4" content_type="html">Institute of Atmospheric Sciences and Climate of the National Research Council (CNR-ISAC), Rome, Italy</affiliation>
	</affiliations>
	<abstract content_type="html">Mountain wave polar stratospheric clouds (PSCs) were detected on 8 February
2003 above the Scandinavian Mountains by in-situ instruments onboard the M55
Geophysica aircraft. PSC particle composition,
backscatter and chlorine activation for this case are studied with a recently developed
non-equilibrium microphysical box model for liquid aerosol. Results from the
microphysical model, run on quasi-lagrangian trajectories, show that the PSC
observed was composed of supercooled ternary (H&lt;sub&gt;2&lt;/sub&gt;O/HNO&lt;sub&gt;3&lt;/sub&gt;/H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;)
solution (STS) particles, which are out of equilibrium with the gas phase.
The measured condensed nitric acid and aerosol backscatter of the PSC can well be simulated with the model. Up to
0.15 ppbv Cl&lt;sub&gt;2&lt;/sub&gt; can be released by the PSC within 2 h, showing the propensity
of these small-scale clouds for chlorine activation. Equilibrium calculations
&amp;ndash; of the sort commonly used in large scale chemistry transport models &amp;ndash;
overestimate the measured condensed nitrate by up to a factor of 3, and overestimates chlorine activation
by 10%, in this mountain wave cloud.</abstract>
	<references>
		<reference numeration="1" content_type="text"> Adriani, A., Cairo, F., Viterbini, M., Mandolini, S., Pulvirenti, L., and Di~Donfrancesco, G.: Multi-wavelength aerosol scatterometer for airborne experiments to study the optical properties of stratospheric aerosol, J. Atmos. Ocean. Tech., 16, 1329&amp;ndash;1336, 1999. </reference>
		<reference numeration="2" content_type="text"> Browell, E. V., Butler, C. F., Ismail, S., Robinette, P. A., Carter, A. F., Higdon, N. S., Toon, O. B., Schoeberl, M. R., and Tuck, A. F.: Airborne lidar observations in the wintertime Arctic stratosphere: polar stratospheric clouds, Geophys. Res. Lett., 17, 385&amp;ndash;388, 1990. </reference>
		<reference numeration="3" content_type="text"> Brune, W H., Anderson, J G., and Chan, K R.: Insitu Observations of ClO in the Antarctic &amp;ndash; ER-2 Aircraft results from 54&amp;deg; S to 72&amp;deg; S Latitude, J. Geophys. Res., 94, 16 649&amp;ndash;16 663, 1989. </reference>
		<reference numeration="4" content_type="text"> Carslaw, K S., Luo, B P., Clegg, S L., Peter, T., Brimblecombe, P., and Crutzen, P J.: Stratospheric Aerosol Growth and \chemHNO_3 Gas Phase Depletion from Coupled \chemHNO_3 and Water uptake by Liquid Particles, Geophys. Res. Lett., 21, 2479&amp;ndash;2482, 1994. </reference>
		<reference numeration="5" content_type="text"> Carslaw, K S., Luo, B., and Peter, T.: An analytic expression for the composition of aqueous \chemHNO_3&amp;ndash;\chemH_2SO_4 stratospheric aerosols including gas phase removal of \chemHNO_3, Geophys. Res. Lett., 22, 1877&amp;ndash;1880, 1995. </reference>
		<reference numeration="6" content_type="text"> Carslaw, K S., Wirth, M., Tsias, A., Luo, B P., Dörnbrack, A., Leutbecher, M., Volkert, H., Renger, W., Bacmeister, J T., and Peter, T.: Particle microphysics and chemistry in remotely observed mountain polar stratospheric clouds, J. Geophys. Res., 103, 5785&amp;ndash;5796, 1998. </reference>
		<reference numeration="7" content_type="text"> Denning, R F., Guidero, S L., Parks, G S., and Gary, B L.: Instrument Description of the Airborne Microwave Temperature Profiler, J. Geophys. Res., 94, 16 757&amp;ndash;16 765, 1989. </reference>
		<reference numeration="8" content_type="text"> Dörnbrack, A., Leutbecher, M., Volkert, H., and Wirth, M.: Mesoscale forecasts of stratospheric mountain waves, Meteorol. Appl., 5, 117&amp;ndash;126, 1998. \bibitem[Dye et~al.(1992)Dye, Baumgardner, Gandrud, Kawa, Kelly, Loewenstein, Ferry, Chan, and Gary] dye92 Dye, J. E., Baumgardner, D., Gandrud, B. W., Kawa, S. R., Kelly, K. K., Loewenstein, M., Ferry, G. V., Chan, K. R., and Gary, B. L.: Particle size distributions in Arctic polar stratsopheric clouds, growth and freezing of sulfuric acid droplets and implications for cloud formation, J. Geophys. Res., 97, 8015&amp;ndash;8034, 1992. </reference>
		<reference numeration="9" content_type="text"> Dörnbrack, A., Leutbecher, M., Kivi, R., and Kyrö, E.: Mountain wave induced record low stratospheric temperatures above northern Scandinavia, Tellus, 51A, 951&amp;ndash;963, 1999. </reference>
		<reference numeration="10" content_type="text"> Dörnbrack, A., Birner, T., Fix, A., Flentje, H., Meister, A., Schmid, H., Browell, E V., and Mahoney, M J.: Evidence for inertia gravity waves forming polar stratospheric clouds over Scandinavia, J. Geophys. Res., 107(D20), 8287, doi:10.1029/2001JD000452, 2002. </reference>
		<reference numeration="11" content_type="text"> Drdla, K.: Applications of a Model of Polar Stratospheric Clouds and Heterogeneous Chemistry, PhD thesis, University of California, Los Angeles, 1996. </reference>
		<reference numeration="12" content_type="text"> Drdla, K. and Schoeberl, M R.: Microphysical modeling of the 1999&amp;ndash;2000 Artic winter: 2. Chlorine activation and ozone depletion, J. Geophys. Res., 108(D5), 8319, doi:10.1029/2001JD001159, 2003. </reference>
		<reference numeration="13" content_type="text"> Fahey, D W., Gao, R S., Carslaw, K S., Kettleborough, J., Popp, P J., Northway, M J., Holecek, J C., Ciciora, S C., McLaughlin, R J., Thompson, T L., Winkler, R H., Baumgardner, D G., Gandrud, B., Wennberg, P O., Dhaniyala, S., McKinney, K., Peter, T., Salawitch, R J., Bui, T P., Elkins, J W., Webster, C R., Atlas, E L., Jost, H., Wilson, J C., Herman, R L., Kleinböhl, A., and von König, M.: The Detection of Large \chemHNO_3-Containing Particles in the Winter Artic Stratosphere, Science, 291, 1026&amp;ndash;1031, 2001. </reference>
		<reference numeration="14" content_type="text"> Hanson, D. and Mauersberger, K.: Laboratory Studies of the Nitrc Acid Trihydrate: Implications for the South Polar Stratosphere, Geophys. Res. Lett., 15, 855&amp;ndash;858, 1988. </reference>
		<reference numeration="15" content_type="text"> Hanson, D R.: Reaction of \chemClONO_2 with \chemH_2O and \chemHCl in Sulfuric Acid and \chemHNO_3/H_2SO_4/H_2O Mixtures, J. Phys. Chem. A, 102, 4794&amp;ndash;4807, 1998. </reference>
		<reference numeration="16" content_type="text"> Jones, R L., Soloman, S., McKenna, D S., Poole, L R., Brune, W H., Toohey, D W., Anderson, J G., and Fahey, D W.: The Polar Stratospheric Cloud Event of January 24, 1989: Part 2, Photochemistry, Geophys. Res. Lett., 17, 541&amp;ndash;544, 1990. </reference>
		<reference numeration="17" content_type="text"> Kawa, S. R., Newman, P. A., Lait, L. R., Schoeberl, M. R., Stimpfle, R. M., Kohn, D. W., Webster, C. R., May, R. D., Baumgardner, D., Dye, J. E., Wilson, J. C., Chan, K. R., and Loewenstein, M.: Activation of chlorine in sulfate aerosol as inferred from aircraft observations, J. Geophys. Res., 102, 3921&amp;ndash;3933, 1997. </reference>
		<reference numeration="18" content_type="text"> Krämer, M. and Afchine, A.: Sampling characteristics of inlets operated at low $U/U_0$ ratios: new insights from computational fluid dynamics (CFX) modeling, J. Aerosol Sci., 35, 683&amp;ndash;694, 2004. </reference>
		<reference numeration="19" content_type="text"> Kühl, S., Dörnbrack, A., Wilms-Grabe, W., Sinnhuber, B.-M., Platt, U., and Wagner, T.: Observational evidence of rapid chlorine activation by mountain waves above northern Scandinavia, J. Geophys. Res., 109, D22309, doi:10.1029/2004JD004797, 2004. </reference>
		<reference numeration="20" content_type="text"> Larsen, N., Knudsen, B. M., Rosen, J. M., Kjome, N. T., Neuber, R., and Kyro, E.: Temperature histories in liquid and solid polar stratospheric cloud formation, J. Geophys. Res., 102, 23 505&amp;ndash;23 517, 1997. </reference>
		<reference numeration="21" content_type="text"> Lowe, D., MacKenzie, A R., Nikiforakis, N., and Kettleborough, J.: A condensed-mass advection based model for the simulation of liquid polar stratospheric clouds, Atmos. Chem. Phys., 3, 29&amp;ndash;38, 2003. </reference>
		<reference numeration="22" content_type="text"> Luo, B., Carslaw, K S., Peter, T., and Clegg, S L.: Vapour pressures of \chemH_2SO_4/HNO_3/HCl/HBr/H_2O solutions to low stratospheric temperatures, Geophys. Res. Let., 22, 247&amp;ndash;250, 1995. </reference>
		<reference numeration="23" content_type="text"> Luo, B., Krieger, U K., and Peter, T.: Densities and refractive indices of \chemH_2SO_4/HNO_3/H_2O solutions, Geophys. Res. Lett., 23, 3707&amp;ndash;3710, 1996. </reference>
		<reference numeration="24" content_type="text"> Lutman, E R., Pyle, J A., Jones, R L., Lary, D L., MacKenzie, A R., Kilbane-Dawe, I., Larsen, N., and Knudsen, B.: Trajectory model studies of \chemClO_x activation during the 1991/92 northern hemispheric winter, Geophys. Res. Lett., 21, 1419&amp;ndash;1422, 1994. </reference>
		<reference numeration="25" content_type="text"> Mann, G W., Davies, S., Carslaw, K S., and Chipperfield, M P.: Factors controlling Artic denitrification in cold winters of the 1990s, Atmos. Chem. Phys., 3, 403&amp;ndash;416, 2003. </reference>
		<reference numeration="26" content_type="text"> Meilinger, S K., Koop, T., Luo, B P., Huthwelker, T., Carslaw, K S., Krieger, U., Crutzen, P J., and Peter, T.: Size-dependent Stratospheric Droplet Composition in lee wave Temperature Fluctuations and their potential role in PSC Freezing, Geophys. Res. Lett., 22, 3031&amp;ndash;3034, 1995. </reference>
		<reference numeration="27" content_type="text"> Molina, M J., Zhang, R., Wooldridge, P J., McMahon, J R., Kim, J E., Chang, H Y., and Beyer, K D.: Physical Chemistry of the \chemH_2SO_4/HNO_3/H_2O System: Implications for Polar Stratopsheric Clouds, Science, 261, 1418&amp;ndash;1423, 1993. </reference>
		<reference numeration="28" content_type="text"> Northway, M J., Gao, R S., Popp, P J., Holecek, J C., Fahey, D W., Carslaw, K S., Tolbert, M A., Lait, L R., Dhaniyala, S., Flagan, R C., Wennberg, P O., Mahoney, M J., Herman, R L., Toon, G C., and Bui, T P.: An analysis of large \chemHNO_3-containing particles sampled in the Arctic stratosphere during the winter of 1999/2000, J. Geophys. Res., 107(D20), 8298, doi:10.1029/2001JD001079, 2002. </reference>
		<reference numeration="29" content_type="text"> Pilinis, C.: Derivation and Numerical Solution of the Species Mass Distribution Equations for Multicomponent Particulate Systems, Atmos. Environ., 24A, 1923&amp;ndash;1928, 1990. </reference>
		<reference numeration="30" content_type="text"> Sander, S P., Friedl, R R., Ravishankara, A R., Golden, D M., Kolb, C E., Kurylo, M J., Huie, R E., Orkin, V L., Molina, M J., Moortgat, G K., and Finlayson-Pitts, B J.: Chemical Kinetics and Photochemical Data for Use in Atmospheric Studies, Evaluation number 14, JPL Publication 02-25, Pasadena, 2003. </reference>
		<reference numeration="31" content_type="text"> Schauffler, S M., Atlas, E L., Donnelly, S G., Andrews, A., Montzka, S A., Elkins, J W., Hurst, D F., Romashkin, P A., Dutton, G S., and Stroud, V.: Chlorine budget and partitioning during the Stratospheric Aerosol and Gas Experiment (SAGE) III Ozone Loss and Validation Experiment (SOLVE), J. Geophys. Res., 108(D5), 4173, doi:10.1029/2001JD002040, 2003. </reference>
		<reference numeration="32" content_type="text"> Schmitt, J.: Aufbau und Erprobung eines in-situ-Mess-Systems am Höhenforschungsflugzeug M55-Geophysica, PhD thesis, ISSN 1434-8454, ISRN DLR-FB-2003-21, 2003. </reference>
		<reference numeration="33" content_type="text"> Schreiner, J., Voigt, C., Kohlmann, A., Arnold, F., Mauersberger, K., and Larsen, N.: Chemical Analysis of Polar Stratospheric Cloud Particles, Science, 283, 968&amp;ndash;970, 1999. </reference>
		<reference numeration="34" content_type="text"> Sessler, J., Good, P., MacKenzie, A R., and Pyle, J A.: What role do type I polar stratospheric cloud and aerosol parameterizations play in modelled lower stratospheric chlorine activation and ozone loss?, J. Geophys. Res., 101, 28 817&amp;ndash;28 835, 1996. </reference>
		<reference numeration="35" content_type="text"> Shi, Q., Jayne, J T., Kolb, C E., Worsnop, D R., and Davidovits, P.: Kinetic model for reaction of \chemClONO_2 with \chemH_2O and \chemHCl and \chemHOCl with \chemHCl in sulfuric acid solutions, J. Geophys. Res., 106, 24 259&amp;ndash;24 274, 2001. </reference>
		<reference numeration="36" content_type="text"> Stefanutti, L., MacKenzie, A R., Santacesaria, V., Adriani, A., Balestri, S., Borrmann, S., Khattatov, V., Mazzinghi, P., Mitev, V., Rudakov, V., Schiller, C., Toci, G., Volk, C M., Yushkov, V., Flentje, H., Kiemle, C., Redaelli, G., Carslaw, K S., Noone, K., and Peter, T.: The APE-THESEO Tropical Campaign: An Overview, J. Atmos. Chem., 48, 1&amp;ndash;33, 2004. </reference>
		<reference numeration="37" content_type="text"> Tabazadeh, A., Turco, R. P., and Jacobson, M. Z.: A model for studying the composition and chemical effects of stratospheric clouds, J. Geophys. Res., 99, 12 897&amp;ndash;12 914, 1994. </reference>
		<reference numeration="38" content_type="text"> Tabazadeh, A., Turco, R. P., Drdla, K., and Jacobson, M. Z.: A study of type 1 polar stratospheric cloud formation, Geophys. Res. Lett., 21, 1619&amp;ndash;1622, 1994. </reference>
		<reference numeration="39" content_type="text"> Tabazadeh, A., Toon, O. B., Gary, B. L., Bacmeister, J. T., and Schoeberl, M. R.: Observational constraints on the formation of Type 1a polar stratospheric clouds, Geophys. Res. Lett., 23, 2109&amp;ndash;2112, 1996. </reference>
		<reference numeration="40" content_type="text"> Toon, O. B., Browell, E. V., Kinne, S., and Jordan, J.: An analysis of lidar observations of polar stratospheric clouds, Geophys. Res. Lett., 17, 393&amp;ndash;396, 1990. </reference>
		<reference numeration="41" content_type="text"> Toon, O. B., and Tolbert, M.: Spectroscopic evidence against nitric acid trihydrate in polar stratospheric clouds, Nature, 375, 218&amp;ndash;221, 1995. </reference>
		<reference numeration="42" content_type="text"> Voigt, C., Schreiner, J., Kohlmann, A., Zink, P., Mauersberger, K., Larsen, N., Deshler, T., Kröger, C., Rosen, J., Adriani, A., Cairo, F., Donfrancesco, G D., Viterbini, M., Ovarlez, J., Ovarlez, H., David, C., and Dörnbrack, A.: Nitric Acid Trihydrate (NAT) in Polar Stratospheric Clouds, Science, 290, 1756&amp;ndash;1758, 2000a. </reference>
		<reference numeration="43" content_type="text"> Voigt, C., Tsias, A., Dörnbrack, A., Meilinger, S., Luo, B., Schreiner, J., Larsen, N., Mauersberger, K., and Peter, T.: Non-equilibrium compositions of liquid polar stratospheric clouds in gravity waves, Geophys. Res. Lett., 27, 3873&amp;ndash;3876, 2000b. </reference>
		<reference numeration="44" content_type="text"> Voigt, C., Larsen, N., Deshler, T., Kröger, C., Schreiner, J., Mauersberger, K., Luo, B., Adriani, A., Cairo, F., Donfrancesco, G D., Ovarlez, J., Dörnbrack, A., Knudsen, B., and Rosen, J.: In situ mountain-wave polar stratospheric cloud measurements: Implications for nitric acid trihydrate formation, J. Geophys. Res., 108(D5), 8331, doi:10.1029/2001JD001185, 2003. </reference>
		<reference numeration="45" content_type="text"> Voigt, C., Schlager, H., Luo, B P., Dörnbrack, A., Roiger, A., Stock, P., Curtius, J., Vössing, H., Borrmann, S., Davies, S., Konopka, P., Schiller, C., Shur, G., and Peter, T.: Nitric acid trihydrate (NAT) formation at low NAT supersaturations, Atmos. Chem. Phys., 5, 1371&amp;ndash;1380, 2005. </reference>
		<reference numeration="46" content_type="text"> von Hobe, M., Grooß, J.-U., Müller, R., and Stroh, F.: A Re-evaluation of the \chemClO/ClO Dimer Equilibrium Constant based on In-Situ Observations, Atmos. Chem. Phys., 5, 693&amp;ndash;702, 2005. </reference>
		<reference numeration="47" content_type="text"> Weisser, C., Mauersberger, K., Schreiner, J., Larsen, N., Cairo, F., Adriani, A., Ovarlez, J., and Deshler, T.: Composition analysis of liquid particles in the Arctic stratopshere, Atmos. Chem. Phys., 6, 689&amp;ndash;696, 2006. </reference>
		<reference numeration="48" content_type="text"> Wernli, H. and Davis, H C.: A Lagrangian-based analysis of extratropical cyclones. 1. The method and some applications, Q. J. Roy. Meteorol. Soc., 123, 467&amp;ndash;489, 1997. </reference>
		<reference numeration="49" content_type="text"> Wirth, M., Tsias, A., Dörnbrack, A., Weiss, V., Carslaw, K. S., Leutbecher, M., Renger, W., Volkert, H., and Peter, T.: Model-guided Lagrangian observation and simulation of mountain polar stratospheric clouds, J. Geophys. Res., 104, 23 971&amp;ndash;23 981, 1999. </reference>
		<reference numeration="50" content_type="text"> WMO: Scientific Assessment of Ozone Depletion: 2002, Report~47, Global Ozone Research and Monitoring Project, Geneva, 2003. </reference>
		<reference numeration="51" content_type="text"> Worsnop, D R., Fox, L E., Zahniser, M S., and Wofsy, S C.: Vapor-Pressures of Solid Hydrates of Nitric-Acid &amp;ndash; Implications for Polar Stratospheric Clouds, Science, 259, 71&amp;ndash;74, 1993. </reference>
		<reference numeration="52" content_type="text"> Zhang, R., Wooldridge, P J., and Molina, M J.: Vapor Pressure Measurements for the \chemH_2SO_4/HNO_3/H_2O and \chemH_2SO_4/HCl/H_2O Systems: Incorporation of Stratospheric Acids into Background Sulfate Aerosols, J. Phys. Chem., 97, 8541&amp;ndash;8548, 1993. </reference>
		<reference numeration="53" content_type="text"> Zöger, M., Afchine, A., Eicke, N., Gerhards, M T., Klein, E., McKenna, D S., Morschel, U., Schmidt, U., Tan, V., Tuitjer, F., Woyke, T., and Schiller, C.: Fast in situ stratospheric hygrometers: A new family of balloon-borne and airborne Lyman a photofragment fluorescence hygrometers, J. Geophys. Res., 104, 1807&amp;ndash;1816, 1999. </reference>
	</references>
</article>

