1 Comprehensive assessment of meteorological conditions 2 and airflow connectivity during HCCT-2010 3 4 A. Tilgner1, L. Schöne1, P. Bräuer1, D. van Pinxteren1, E. Hoffmann1, 5 G. Spindler1, S. A. Styler1, S. Mertes1, W. Birmili1, R. Otto1, M. Merkel1, 6 K. Weinhold1, A. Wiedensohler1, H. Deneke1, R. Schrödner1, R. Wolke1, 7 J. Schneider2, W. Haunold3, A. Engel3, A. Wéber3, and H. Herrmann1 8 [1]{Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany} 9 [2]{Particle Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany} 10 [3]{Institute for Atmospheric and Environmental Sciences (IAU), Goethe University 11 Frankfurt, Germany} 12 Correspondence to: H. Herrmann (
[email protected]) 13 14 Abstract 15 This study presents a comprehensive assessment of the meteorological conditions and 16 atmospheric flow during the Lagrangian-type “Hill Cap Cloud Thuringia 2010” experiment 17 (HCCT-2010), which was performed in September and October 2010 at Mt. Schmücke in the 18 Thuringian Forest, Germany and which used observations at three measurement sites 19 (upwind, in-cloud, and downwind) to study physical and chemical aerosol–cloud interactions. 20 A Lagrangian-type hill cap cloud experiment requires not only suitable cloud conditions but 21 also connected airflow conditions (i.e. representative air masses at the different measurement 22 sites). The primary goal of the present study was to identify time periods during the 6-week 23 duration of the experiment in which these conditions were fulfilled and therefore which are 24 suitable for use in further data examinations. The following topics were studied in detail: i) 25 the general synoptic weather situations, including the mesoscale flow conditions ii) local 26 meteorological conditions and iii) local flow conditions.