The AQUAVIT formal intercomparison of atmospheric water measurement methods

Transcription

1 The AQUAVIT formal intercomparison of atmospheric water measurement methods Organisers: H. Saathoff (1), C. Schiller (2), V. Ebert (3), Referees: D. W. Fahey (4) R.-S. Gao (4), O. Möhler (1), and the AQUAVIT Team (1) Institute for Meteorology and Climate Research, Forschungszentrum Karlsruhe, Germany (2) Institute of Chemistry and Dynamics of the Geosphere, Forschungszentrum Jülich, Germany (3) Institute for Physical Chemistry, University of Heidelberg, Germany, (4) NOAA Earth System Science Laboratory, Boulder, CO, USA

2 Is there a supersaturation puzzle Peter et al., Science, 2006 Conventional Nucleation and Growth Suppressed nucleation of ice enhanced humidity Suppressed crystal growth enhanced humidity or just a problem with measurement techniques?

3 Disagreement between atmospheric measurements? Vömel et al., JGR, 2007 See also Peter, Krämer, Möhler SPARC, 2008

4 AIDA formal intercomparison of atmospheric water vapour measurement methods October 2007 () Participation: 36 scientists 17 research groups 11 countries 22 instruments 3 referees

5 Partners and Instruments Participants Harald Saathoff Volker Ebert Cornelius Schiller, Nicole Spelten Robert L. Herman, Robert F. Troy Holger Vömel Elliot Weinstock, Jessica Smith Sergey Khaykin, Leonid Korshunov Linnea Avallone, Sean Davis Teresa Campos, Frank Flocke, Dennis Krämer Mark Zondlo Martina Krämer, Cornelius Schiller George Durry Debbie O'Sullivan Theo Brauers, Rolf Häseler Zoltán Bozóki, Arpad Mohacsi Andreas Zahn, Julia Keller, Christoff Dyroff Frank Wienhold, Ulrich Krieger, Martin Brabec Ulrich Bundke Peter Mackrodt Cornelius Schiller David Fahey, Ru-Shan Gao COST Ottmar - WAVACS Möhler WG-1, Lindenberg, 2008 Institute Forschungszentrum Karlsruhe (IMK-AAF) University of Heidelberg Forschunszentrum Jülich (ICG-1) JPL, Caltech University of Colorado Harvard University Central Aerological Observatory University of Colorado NCAR Boulder Southwest Science, Inc. Forschunszentrum Jülich (ICG-1) University of Reims & INSU/CNRS UK Met Office Forschungszentrum Jülich (ICG-2) University of Szeged Forschungszentrum Karlsruhe (IMK-ASF) ETH Zürich University of Frankfurt PTB Braunschweig Forschungszentrum Jülich NOAA, Boulder Forschungszentum Karlsruhe (IMK-AAF) Instrument AIDA TDL, MBW-373LX (FP) AIDA TDL FISH-1 (Ly-α), FISH-2 (Ly-α), JPL-Laser-Hygrometer (TDL) CFH (FP) Harvard Ly-α FLASH-A (Ly-α), FLASH-B (Ly-α) CLH (TDL) NCAR OPLH (TDL) HIAPER VCSEL (TDL) Ojster TDL PicoSDLA (TDL) Met Office (Ly-α) Vaisala Sensor DM 500 WaSul-Hygro (PA) CARIBIC (Buck FP, PA), Isotope TDL Snow-White (FP) PADDY (FP) Water permeation source MBW-DP30 (FP) Referees Referee

6 Facility AIDA

7 Instrument Setup Thermostated housing K FLASH A Ly-α MBW-373LX FP FISH-1 Ly-α 1-5 Vaisala DM AIDA-TDL PADDY FP 1-5 AID TDL CLH TDL 2-8 JPL TDL Snow-White FISH-2 Ly-α 1-5 FLASH B Ly-α 1-5 CFH FP 1-5 Harvard Ly-α NCAR OPLH 5-10 HIAPER TDL 1-10 WaSul-Hygro 0.6 OJSTER PicoSDLA NCAR Buck 5 Met Office Ly-α Buck FP (CARIBIC) 2 Photoacoustic (CARIBIC) 2 Isotope TDL 2

8 List of experiments October 2007 Day Exp. No. Experiment type T (K) P (hpa) H 2 O (ppm) 15 3 Constant p,t , 5 Constant p,t Constant p,t Constant p,t Constant p,t Dynamic p,t Dynamic p,t Dynamic p,t Dynamic p,t Dynamic p,t

9 Figure 1. October 15, 2007

10 Preliminary result

11 Result of Dynamic Experiment

12 Summary and Outlook High humidity observed in upper troposphere still under discussion Field intercomparison shows disagreement between different water instruments first laboratory intercomparison of major aircraft and balloon instruments No final conclusions yet data discussion meeting May in Zurich More results and conclusions until SPARC meeting September 1 5 in Bologna Second step: operation condition on aircraft/balloons, sampling issues,

13 Sponsors Stratospheric Processes and their Role in Climate SPARC (a core project of the World Climate Research Program WCRP) EUROCHAMP A European Union FP6 project. SCOUT-O3 A European Union FP6 project. Swiss Federal Institute of Technology Zurich (ETH) Institute for Atmospheric and Climate Science. Forschungszentrum Jülich Institute of Chemistry and Dynamics of the Geosphere (ICG-1). Forschungszentrum Karlsruhe Institute of Meteorology and Climate Research (IMK-AAF)