1 / 10

VI-ACI Kickoff Meeting, Karlsruhe, May 14/15, 2007

This meeting aims to discuss the parameterization of heterogeneous ice nucleation, perform experimental and modeling studies, and explore the composition and activity of aerosols.

jarmijo
Download Presentation

VI-ACI Kickoff Meeting, Karlsruhe, May 14/15, 2007

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  2. Background VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  3. Background Parameterisation of heterogeneous ice nucleation in most models as function of T and RH: Fletcher et al., 1962 Meyers et al., 1992 Khain et al., 2000 Alfred Wegener, 1911 “Thermodynamic der Atmosphäre” Concluded the existence of ice nuclei from observations during Arctic expeditions. Recent measurements of atmospheric ice nuclei: Kreidenweis et al., 1998 DeMott et al., 1998 Ström et al., 1998 Rogers et al., 2001 Cziczo et al., 2003, 2004 Only very recently new parameterisations of het. IN consider aerosol parameters: Kärcher&Lohmann, 2002 Lohmann et al., 2004 Diehl&Wurzler, 2004 Wieckmann, 1949 VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  4. Objectives Experimental • Quantify CCN and IN activity of aerosols Natural: desert dust, secondary organic aerosol, biogenic particles,  Anthropogenic: air traffic emissions, combustion particles. • Quantify the effect of particle transformation on CCN and IN activity condensed-phase processes heterogeneous chemistry coating by condensation of less volatile compounds. • Study the formation and slow transformation of potential CCN and IN from representative precursor mixtures, natural light, and oxidant levels. • Perform experiments at simulated cloud conditions to investigate the competition of different aerosol types for cloud droplet formation and heterogeneous freezing. VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  5. Objectives Modelling • Improve existing or develop novel concepts for aerosol-related parameterisations of ice nucleation in cloud and climate models. • Investigate the sensitivity of precipitation initiation in cloud models to the natural variability of CCN and IN concentrations and their properties measured in the laboratory experiments. • Investigate the partitioning of water in life cycles of cirrus clouds by cloud chamber simulations, link the observations to field measurements, and reproduce the measurements with model simulations. • Determine particle composition and mixing state of ubiquitous UTLS aerosol composition (sulphate, organics, soot) by means of process-oriented modelling in support of laboratory measurements of ice nucleation activity of such mixtures. VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  6. Partners Forschungszentrum Karlsruhe, IMK-AAF Thomas Leisner, Ottmar Möhler Deutsches Zentrum für Luft- und Raumfahrt, IPA Ulrich Schumann, Bernd Kärcher Forschungszentrum Jülich, ICG-1, ICG-2 Martin Riese, Martina Krämer, Andreas Wahner, Thomas Mentel Leibniz-Institut für Troposphärenforschung, IfT Jost Heintzenberg, Frank Stratmann Universität Mainz, Institut für Physik der Atmosphäre Stephan Borrmann, Johannes Schneider Universität Frankfurt, Institut für Atmosphäre und Umwelt Ulrich Schmidt, Ulrich Bundke Universität Heidelberg, Physikaisch-Chemisches Institut Volker Ebert ETH Zurich, Institute for Atmospheric and Climate Science Ulrike Lohmann, Olaf Stetzer University of Hertfordshire, Science an Technology RI Paul Kaye, Joseph Ulanowski Tel Aviv University, Cloud and Precipitation Physics Laboratory Zev Levin VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  7. Project Structure Speaker: Prof. T. Leisner Steering Committee: Work package coordinators and one representative of each partner institute Laboratory Experiments (Dr. O. Möhler) Modelling Studies (Prof. B. Kärcher) WP-L1: AIDA (Dr. O. Möhler) IMK-AAF, ICG-I, ICG-II, UniHD, UniMZ, UniHS, ETH WP M1: Processes (Prof. B. Kärcher) DLR, IMK-AAF, ICG-I, IfT, UniMZ. WP-L2: LACIS (Prof. J Heintzenberg) IfT, ICG-II, UniMZ WP M2: Clouds (Prof. U. Lohmann) Uni-TA, DLR, ETH WP-L3: ZINC (Dr. O. Stetzer) ETH WP M3: Climate (Dr. U. Burkhardt) DLR, ETH WP L4: SAPHIR (Dr. Th. F. Mentel) UniMZ, ICG-II, IfT, ETH VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  8. Related Projects and Activities Helmholtz project PAZI-2, coordinated by DLR Oberpfaffenhofen, IPA HALO research aircraft: DFG SPP and Helmholtz Virtual Institute DFG SFB TROPEIS (Frankfurt, Mainz, Darmstadt) DFG Research Group SAMUM (Saharan Dust) EU Integrated Project SCOUT-O3 NCAR Strategic Initiative Ice Initiation in Clouds (ICE-L) UK NERC project APPRAISE (Universities Manchester, Leeds, Hertfordshire) Ice Nucleation Workshop (with Colorado State University and ETH Zürich VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  9. Time Table VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

  10. Work Program and Milestones … will be subject of following talks and discussion tomorrow. VI-ACI kickoff meeting, Karlsruhe, May 14/15, 2007.

More Related