By the same authors

From the same journal

From the same journal

Comprehensive assessment of meteorological conditions and airflow connectivity during HCCT-2010

Research output: Contribution to journalArticle

Full text download(s)

Published copy (DOI)

Author(s)

  • A. Tilgner
  • L. Schöne
  • D. Van Pinxteren
  • E. Hoffmann
  • G. Spindler
  • S. A. Styler
  • S. Mertes
  • W. Birmili
  • R. Otto
  • M. Merkel
  • K. Weinhold
  • A. Wiedensohler
  • H. Deneke
  • R. Schrödner
  • R. Wolke
  • J. Schneider
  • W. Haunold
  • A. Engel
  • A. Wéber
  • H. Herrmann

Department/unit(s)

Publication details

JournalAtmospheric Chemistry and Physics
DatePublished - 2014
Issue number17
Volume14
Number of pages24
Pages (from-to)9105-9128
Original languageEnglish

Abstract

This study presents a comprehensive assessment of the meteorological conditions and atmospheric flow dur- ing the Lagrangian-type “Hill Cap Cloud Thuringia 2010” experiment (HCCT-2010), which was performed in Septem- ber and October 2010 at Mt. Schmücke in the Thuringian Forest, Germany and which used observations at three measurement sites (upwind, in-cloud, and downwind) to study physical and chemical aerosol–cloud interactions. A Lagrangian-type hill cap cloud experiment requires not only suitable cloud conditions but also connected airflow condi- tions (i.e. representative air masses at the different measure- ment sites). The primary goal of the present study was to identify time periods during the 6-week duration of the ex- periment in which these conditions were fulfilled and there- fore which are suitable for use in further data examinations. The following topics were studied in detail: (i) the general synoptic weather situations, including the mesoscale flow conditions, (ii) local meteorological conditions and (iii) lo- cal flow conditions. The latter were investigated by means of statistical analyses using best-available quasi-inert trac- ers, SF6 tracer experiments in the experiment area, and re- gional modelling. This study represents the first applica- tion of comprehensive analyses using statistical measures such as the coefficient of divergence (COD) and the cross- correlation in the context of a Lagrangian-type hill cap cloud experiment. This comprehensive examination of local flow connectivity yielded a total of 14 full-cloud events (FCEs), which are defined as periods during which all connected flow and cloud criteria for a suitable Lagrangian-type ex- periment were fulfilled, and 15 non-cloud events (NCEs), which are defined as periods with connected flow but no cloud at the summit site, and which can be used as refer- ence cases. The overall evaluation of the identified FCEs provides the basis for subsequent investigations of the mea- sured chemical and physical data during HCCT-2010 (see http://www.atmos-chem-phys.net/special_issue287.html). Results obtained from the statistical flow analyses and regional-scale modelling performed in this study indicate the existence of a strong link between the three measurement sites during the FCEs and NCEs, particularly under condi- tions of constant southwesterly flow, high wind speeds and slightly stable stratification. COD analyses performed using continuous measurements of ozone and particle (49nm di- ameter size bin) concentrations at the three sites revealed, particularly for COD values

Bibliographical note

© Author(s) 2014.

Discover related content

Find related publications, people, projects, datasets and more using interactive charts.

View graph of relations