ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-2689-2011 Measurement and simulation of the 16/17 April 2010 Eyjafjallajökull volcanic ash layer dispersion in the northern Alpine region Emeis S. 1 Forkel R. 1 Junkermann W. 1 Schäfer K. 1 Flentje H. 2 Gilge S. 2 Fricke W. 2 Wiegner M. 3 Freudenthaler V. 3 Groβ S. 3 Ries L. 4 Meinhardt F. 4 Birmili W. 5 Münkel C. 6 Obleitner F. 7 Suppan P. 1 Institute for Meteorology and Climate Research (IMK-IFU), Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany DWD German Meteorological Service, Offenbach and Hohenpeißenberg, Germany Meteorological Institute, Ludwig-Maximilians-Universität Munich (MIM), Germany UBA Federal Environmental Agency, Germany Leibniz Institut für Tropospheric Research, Leipzig, Germany Vaisala GmbH, Hamburg, Germany IMG-IBK Institute for Meteorology and Geophysics, University of Innsbruck, Austria 22 03 2011 11 6 2689 2701 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/2689/2011/acp-11-2689-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/2689/2011/acp-11-2689-2011.pdf

The spatial structure and the progression speed of the first ash layer from the Icelandic Eyjafjallajökull volcano which reached Germany on 16/17 April is investigated from remote sensing data and numerical simulations. The ceilometer network of the German Meteorological Service was able to follow the progression of the ash layer over the whole of Germany. This first ash layer turned out to be a rather shallow layer of only several hundreds of metres thickness which was oriented slantwise in the middle troposphere and which was brought downward by large-scale sinking motion over Southern Germany and the Alps. Special Raman lidar measurements, trajectory analyses and in-situ observations from mountain observatories helped to confirm the volcanic origin of the detected aerosol layer. Ultralight aircraft measurements permitted the detection of the arrival of a second major flush of volcanic material in Southern Germany. Numerical simulations with the Eulerian meso-scale model MCCM were able to reproduce the temporal and spatial structure of the ash layer. Comparisons of the model results with the ceilometer network data on 17 April and with the ultralight aircraft data on 19 April were satisfying. This is the first example of a model validation study from this ceilometer network data.

 References Amt der Tiroler Landesregierung: Monthly report of air pollution in Tirol, April 2010, available at: http://www.tirol.gv.at/uploads/media/Monatsbericht_April_2010.pdf. Ansmann, A., Bösenberg, J., Chaikovsky, A., Comerón, A., Eckhardt, S., Eixmann, R., Freudenthaler, V., Ginoux, P., Komguem, L., Linné, H., López Márquez, M. Á., Matthias, V., Mattis, I., Mitev, V., Müller, D., Music, S., Nickovic, S., Pelon, J., Sauvage, L., Sobolewsky, P., Srivastava, M. K., Stohl, A., Torres, O., Vaughan, G., Wandinger, U., and Wiegner, M.: Long-range transport of Saharan dust to northern Europe: The 11–16~October~2001 outbreak observed with EARLINET, J. Geophys. Res., 108(D24), 4783, http://dx.doi.org/10.1029/2003JD003757doi:10.1029/2003JD003757, 2003. Birmili, W., Weinhold, K., Nordmann, S., Wiedensohler, A., Spindler, G., Müller, K., Herrmann, H., Gnauk, T., Pitz, M., Cyrys, J., Flentje, H., Nickel, C., Kuhlbusch, T. A. J., Löschau, G., Haase, D., Meinhardt, F., Schwerin, A., Ries, L., and Wirtz, K.: Atmospheric aerosol measurements in the German Ultrafine Aerosol Network (GUAN): Part 1 – soot and particle number size distributions, Gefahrst. Reinh. Luft, 69, 137–145, 2009. Bösenberg, J., Matthias, V., Amodeo, A., Amoiridis, V., Ansmann, A., Baldasano, J. M., Balin, I., Balis, D., Böckmann, C., Boselli, A., Carlsson, G., Chaikovsky, A., Chourdakis, G., Comerón, A., De Tomasi, F., Eixmann, R.,Freudenthaler, V., Giehl, H., Grigorov, I., Hågård, A., Iarlori, M., Kirsche, A., Kolarov, G., Komguem, L., Kreipl, S., Kumpf, W., Larchevêque, G., Linné, H., Matthey, R., Mattis, I., Mekler, A., Mironova, I., Mitev, V., Mona, L., Müller, D., Music, S., Nickovic, S., Pandolfi, M., Papayannis, A., Pappalardo, G., Pelon, J., Pérez, C., Perrone, R. M., Persson, R., Resendes, D. P., Rizi, V., Rocadenbosch, F., Rodrigues, J. A., Sauvage, L., Schneidenbach, L., Schumacher, R., Shcherbakov, V., Simeonov, V., Sobolewski, P., Spinelli, N., Stachlewska, I., Stoyanov, D., Trickl, T., Tsaknakis, G., Vaughan, G., Wandinger, U., Wang, X., Wiegner, M., Zavrtanik, M., and Zerefos, C.: EARLINET: A European aerosol research lidar network to establish an aerosol climatology. MPI-Report 348, Max-Planck-Institute for Meteorology, Hamburg, Germany, 191~pp., ISSN 0937-1060, available at: http://www.mpimet.mpg.de/fileadmin/publikationen/Reports/max_scirep_348.pdf, 2003. Casadevall, T. J.: Volcanic hazards and aviation safety – Lessons of the past decade, FAA Aviation Safety J., 2, 9–17, 1992. Damoah, R., Spichtinger, N., Forster, C., James, P., Mattis, I., Wandinger, U., Beirle, S., Wagner, T., and Stohl, A.: Around the world in 17 days – hemispheric-scale transport of forest fire smoke from Russia in May 2003, Atmos. Chem. Phys., 4, 1311–1321, http://dx.doi.org/10.5194/acp-4-1311-2004doi:10.5194/acp-4-1311-2004, 2004. Durand, M. and Grattan, J.: Effects of volcanic air pollution on health, The Lancet, 357, 164, 2001. Elbern, H.: R&D modelling/forecasting of the Eyjafjöll ash plume at University of Cologne. Talk at the ESA/EUMETSAT Workshop on Volcanic Ash Plume Monitoring on 26/27 May 2010 at Frascati (Rome), http://earth.eo.esa.int/workshops/Volcano/files/8_Elbern_Eyjafjalla_ESA.pdf, 2010. Emeis, S.: Measurement Methods in Atmospheric Sciences. In situ and remote. Series: Quantifying the Environment, Vol. 1, Borntraeger Stuttgart, ISBN 978-3-443-01066-9, 2010. Flentje, H., Heese, B., Reichardt, J., and Thomas, W.: Aerosol profiling using the ceilometer network of the German Meteorological Service, Atmos. Meas. Tech. Discuss., 3, 3643–3673, http://dx.doi.org/10.5194/amtd-3-3643-2010doi:10.5194/amtd-3-3643-2010, 2010a. Flentje, H., Claude, H., Elste, T., Gilge, S., Köhler, U., Plass-Dülmer, C., Steinbrecht, W., Thomas, W., Werner, A., and Fricke, W.: The Eyjafjallajökull eruption in April 2010 – detection of volcanic plume using in-situ measurements, ozone sondes and lidar-ceilometer profiles, Atmos. Chem. Phys., 10, 10085–10092, http://dx.doi.org/10.5194/acp-10-10085-2010doi:10.5194/acp-10-10085-2010, 2010b. Freudenthaler, V., Esselborn, M., Wiegner, M., Heese, B., Tesche, M., Ansmann, A., Müller, D., Althausen, D., Wirth, M., Fix, A., Ehret, G., Knippertz, P., Toledano, C., Gasteiger, J., Garhammer, M., and Seefeldner, M.: Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM 2006. Tellus 61B, 165–179, 2009. Furger, F., Dommen, J., Graber, W. K., Poggio, L., Prévôt, A., Emeis, S., Trickl, T., Grell, G., Neininger, B., and Wotawa, G.: The VOTALP Mesolcina Valley Campaign 1996 – Concept, Background and some Highlights, Atmos. Environ., 34, 1395–1412, 2000. Grattan, J. and Brayshay, M.: An Amazing and Portentous Summer: Environmental and Social Responses in Britain to the 1783 Eruption of an Iceland Volcano, The Geographical Journal, 161, 125–134, 1995. Grell, G. A., Dudhia, J., and Stauffer, D. R.: A description of the Fifth-generation Penn State/NCAR Mesoscale Model (MM5), NCAR Tech Note TN-398#STR, 122~pp., 1994. Grell, G. A., Emeis, S., Stockwell, W. R., Schoenemeyer, T., Forkel, R., Michalakes, J., Knoche, R., and Seidl, W.: Application of a multiscale, coupled MM5/Chemistry Model to the complex terrain of the VOTALP Valley Campaign, Atmos. Environ., 34, 1435–1453, 2000. Grutter, M., Basaldud, R., Rivera, C., Harig, R., Junkerman, W., Caetano, E., and Delgado-Granados, H.: SO<sub>2</sub> emissions from Popocatpetl volcano: emission rates and plume imaging using optical remote sensing techniques, Atmos. Chem. Phys., 8, 6655–6663, http://dx.doi.org/10.5194/acp-8-6655-2008doi:10.5194/acp-8-6655-2008, 2008. Haas, E., Forkel, R., and Suppan, P.: Application and intercomparison of the RADM2 and RACM chemistry mechanism including a new isoprene degradation scheme within the regional meteorology-chemistry-model MCCM, Int. J. Environ. Pollut., 40, 1/2/3, 236–148, 2010. ICAO: International Civil Aviation Organisation International Handbook on the International Airways Volcano Watch (IAVW) – Operational procedures and contact list, ICAO Doc 9766-AN/968, First Edition, 2000. Junkermann, W.: An Ultralight Aircraft as Platform for Research in the Lower Troposphere: System Performance and First Results from Radiation Transfer Studies in Stratiform Aerosol Layers and Broken Cloud Conditions, J. Atmos. Oceanic Technol., 18, 934–946, 2001. Petersen, G. N.: A short meteorological overview of the Eyjafjallajökull eruption 14 April–23 May 2010, Weather, 65(8), 203–207, 2010. Pollack, J. B., Toon, O. B., Ackerman, T. P., McKay, C. P., and Turco, R. P.: Environmental Effects of an Impact-Generated Dust Cloud: Implications for the Cretaceous-Tertiary Extinctions, Science, 219(4582), 287–289, 1983. Schäfer, K., Thomas, W., Peters, A., Ries, L., Obleitner, F., Schnelle-Kreis, J., Birmili, W., Diemer, J., Fricke, W., Junkermann, W., Pitz, M., Emeis, S., Forkel, R., Suppan, P., Flentje, H., Wichmann, H. E., Gilge, S., Meinhardt, F., Zimmermann, R., Weinhold, K., Soentgen, J., Münkel, C., Freuer, C., and Cyrys, J.: Influences of the 2010 Eyjafjallaj|"okull volcanic plume on air quality in the northern Alpine region, Atmos. Chem. Phys. Discuss., 11, 9083–9132, http://dx.doi.org/10.5194/acpd-11-9083-2011doi:10.5194/acpd-11-9083-2011, 2011. Schell, B., Ackermann, I. J., Hass, H., Binkowski, F. S., and Ebel, A.: Modeling the formation of secondary organic aerosol within a comprehensive air quality model system, J. Geophys. Res., 106, 28275–28293, 2001. Schreiter M.: Auswertung von Ceilometerdaten hinsichtlich Grenzschicht- und Wolkenhöhe im Raum Innsbruck und Wien, Diploma thesis submitted at Institute of Meteorology and Geophysics, Innsbruck University, 2010. Schumann, U., Weinzierl, B., Reitebuch, O., Schlager, H., Minikin, A., Forster, C., Baumann, R., Sailer, T., Graf, K., Mannstein, H., Voigt, C., Rahm, S., Simmet, R., Scheibe, M., Lichtenstern, M., Stock, P., Rüba, H., Schäuble, D., Tafferner, A., Rautenhaus, M., Gerz, T., Ziereis, H., Krautstrunk, M., Mallaun, C., Gayet, J.-F., Lieke, K., Kandler, K., Ebert, M., Weinbruch, S., Stohl, A., Gasteiger, J., Olafsson, H., and Sturm, K.: Airborne observations of the Eyjafjalla volcano ash cloud over Europe during air space closure in April and May 2010, Atmos. Chem. Phys. Discuss., 10, 22131–22218, http://dx.doi.org/10.5194/acpd-10-22131-2010doi:10.5194/acpd-10-22131-2010, 2010. Shao, Y.: Physics and Modelling of Wind Erosion, 2nd Edn. (revised and expanded), Atmospheric and Oceanographic Sciences Library, Springer, 452~pp., 2008. Simpson, J. J., Hufford, G. L., Servranckx, R., Berg, J., and Pieri, D.: Airborne Asian Dust: Case Study of Long-Range Transport and Implications for the Detection of Volcanic Ash, Weather Forecast., 18, 121–141, 2003. Stockwell, W. R., Middleton, P., Chang, J. S., and Tang, X.: The second generation regional acid deposition model chemical mechanism for regional air quality modeling, J. Geophys. Res., 95, 16343–16367, 1990. Tupper, A., Davey, J., Stewart, P., Stunder, B., Servranckx, R., and Prata, F.: Aircraft encounters with volcanic clouds over Micronesia, Oceania, 2002–03, Aust. Met. Mag., 55, 289–299, 2006. Wiegner, M., Gasteiger, J., Groß, S., Schnell, F., Freudenthaler, V., and Forkel, R.: Characterization of the Eyjafjallajökull ash-plume: Potential of lidar remote sensing, Phys. Chem. Earth, http://dx.doi.org/10.1016/j.pce.2011.01.006doi:10.1016/j.pce.2011.01.006, in press, 2011. Witham, C. S., Hort, M. C., Potts, R., Servranckx, R., Husson, P., and Bonnardot, F.: Comparison of VAAC atmospheric dispersion models using the 1 November 2004 Grimsvötn eruption, Meteorol. Appl., 14, 27–38, 2007. Woods, A. W., Holasek, R. E., and Self, S.: Wind-driven dispersal of volcanic ash plumes and its control on the thermal structure of the plume-top, Bull. Volcanol., 57, 283–292, 1995.