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Results from the University of Toronto Continuous Flow Diffusion Chamber (Ut-cfdc) at the International Workshop for Comparing Ice Nucleation Measuring Systems (Icis 2007) : Volume 10, Issue 9 (01/09/2010)

By Kanji, Z. A.

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Book Id: WPLBN0003985915
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Results from the University of Toronto Continuous Flow Diffusion Chamber (Ut-cfdc) at the International Workshop for Comparing Ice Nucleation Measuring Systems (Icis 2007) : Volume 10, Issue 9 (01/09/2010)  
Author: Kanji, Z. A.
Volume: Vol. 10, Issue 9
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

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D. Abbat, J. P., Möhler, O., Kanji, Z. A., & Demott, P. J. (2010). Results from the University of Toronto Continuous Flow Diffusion Chamber (Ut-cfdc) at the International Workshop for Comparing Ice Nucleation Measuring Systems (Icis 2007) : Volume 10, Issue 9 (01/09/2010). Retrieved from http://community.ebooklibrary.org/


Description
Description: University of Toronto, Department of Chemistry, Toronto, ON, Canada. The University of Toronto continuous flow diffusion chamber (UT-CFDC) was used to study heterogeneous ice nucleation at the International Workshop on Comparing Ice Nucleation Measuring Systems (ICIS 2007) which also represented the 4th ice nucleation workshop, on 14–28 September 2007. One goal of the workshop was to inter-compare different ice nucleation measurement techniques using the same aerosol sample source and preparation method. The aerosol samples included four types of desert mineral dust, graphite soot particles, and live and dead bacterial cells (Snomax®). This paper focuses on the UT-CFDC results, with a comparison to techniques of established heritage including the Colorado State CFDC and the AIDA expansion chamber. Good agreement was found between the different instruments with a few specific differences attributed to the variation in how onset of ice formation is defined between the instruments. It was found that when efficiency of ice formation is based on the lowest onset relative humidity, Snomax® particles were most efficient followed by the desert dusts and then soot. For all aerosols, deposition mode freezing was only observed for T < 245 K except for the dead bacteria where freezing occurred below water saturation as warm as 263 K.

Summary
Results from the University of Toronto continuous flow diffusion chamber (UT-CFDC) at the international workshop for comparing ice nucleation measuring systems (ICIS 2007)

Excerpt
Abbatt, J. P. D., Benz, S., Cziczo, D. J., Kanji, Z., Lohmann, U., and Mohler, O.: Solid ammonium sulfate aerosols as ice nuclei: A pathway for cirrus cloud formation, Science, {313}(5794), 1770–1773, 2006.; Andreae, M. O. and Rosenfeld, D.: Aerosol-cloud-precipitation interactions. Part 1. The nature and sources of cloud-active aerosols, Earth-Sci. Rev., {89}(1–2), 13–41, 2008.; Ansmann, A., Mattis, I., Muller, D., Wandinger, U., Radlach, M., Althausen, D., and Damoah, R.: Ice formation in Saharan dust over central Europe observed with temperature/humidity//aerosol Raman lidar, J. Geophys. Res.-Atmos., {110}(D18), D18S12, doi:10.1029/2004JD005000, 2005.; Archuleta, C. M., DeMott, P. J., and Kreidenweis, S. M.: Ice nucleation by surrogates for atmospheric mineral dust and mineral dust/sulfate particles at cirrus temperatures, Atmos. Chem. Phys., 5, 2617–2634, doi:10.5194/acp-5-2617-2005, 2005.; Benz, S., Megahed, K., Möhler, O., Saathoff, H., Wagner, R., and Schurath, U.: T-dependent rate measurements of homogeneous ice nucleation in cloud droplets using a large atmospheric simulation chamber, J. Photochem. Photobiol. A, 176, 208–217, 2005.; Cantrell, W. and Heymsfield, A.: Production of ice in tropospheric clouds – A review, B. Am. Meteorol. Soc., {86}(6), 795–807, 2005.; Chen, Y. L., Kreidenweis, S. M., McInnes, L. M., Rogers, D. C., and DeMott, P. J.: Single particle analyses of ice nucleating aerosols in the upper troposphere and lower stratosphere, Geophys. Res. Lett., {25}(9), 1391–1394, 1998.; Cziczo, D. J., Murphy, D. M., Hudson, P. K., and Thomson, D. S.: Single particle measurements of the chemical composition of cirrus ice residue during CRYSTAL-FACE, J. Geophys. Res.-Atmos., {109}(D4), D04201, doi:10.1029/2003JD004032, 2004.; DeMott, P. J., Chen, Y., Kreidenweis, S. M., Rogers, D. C., and Sherman, D. E.: Ice formation by black carbon particles, Geophys. Res. Lett., {26}(16), 2429–2432, 1999.; DeMott, P. J., Cziczo, D. J., Prenni, A. J., Murphy, D. M., Kreidenweis, S. M., Thomson, D. S., Borys, R., and Rogers, D. C.: Measurements of the concentration and composition of nuclei for cirrus formation, P. Natl. Acad. Sci. USA, {100}(25), 14655–14660, 2003.; DeMott, P. J., Möhler, O., Stetzer, O., Murakami, M., Bundke, U., Kanji, Z., Cotton, R., Jones, H., Leisner, T., Klein, H., Cziczo, D., Petters, M., Prenni, A., Abbatt, J., Saito, A., Ardon, K., Levin, Z., Bingemer, H., Sierau, B., Nicolet, M., Bowels, J., Gallavardin, S., Targino, A., Dorsey, J., Georgakopolous, D., Rzesanke, D., Brinkmann, M., Schwartz, T., Benz, S., Wagner, R., Saathoff, H., Ebert, V., Team, O. A., and Vali, G.: {The Fourth International Ice Nucleation Workshop (ICIS-2007): Objectives and Preliminary Results }Proceedings of 15th ICCP, Cancun, Mexico, 7–11 July 2008.; DeMott, P. J., Möhler, O., Stetzer, O., Murakami, M., Leisner, T., Bundke, U., Klein, H., Kanji, Z. A., Cotton, R., Jones, H., Petters, M., Benz, S., Brinkmann, M., Rzesanke, D., Saathoff, H., Nicolet, M., Lohmann, U., Gallavardin, S., Saito, A., Nillius, B., Bingemer, H., Abbatt, J. P. D., Ardon, K., Levin, Z., Ganor, E., Georgakopoulos, D. G., Saunders, C., and Vali, G.: Resurgence in Ice Nuclei Measurement Research, B. Am. Meteorol. Soc., submitted, 2010.; Dymarska, M., Murray, B. J., Sun, L. M., Eastwood, M. L., Knopf, D. A., and Bertram, A. K.: Deposition ice nucleation on soot at temperatures relevant for the lower troposphere, J. Geophys. Res.-Atmos., {111}(D4), D04204, doi:10.1029/2005JD006627, 2006.; Eastwood, M. L., Cremel, S., Gehrke, C., Girard, E., and Bertram, A. K.: Ice nucleation on mineral dust particles: Onset conditions, nucleation rates and contact angles, J. Geophys. Res.-Atmos., 113, D22203, doi:10.1029/2008JD010639, 2008.; Eastwood, M. L., Cremel, S., Wheeler, M., Murray, B. J., Girard, E., and Bertram, A. K.: Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles, Geophys. Res. Lett., 36, L02811, doi:10.10

 

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