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Kottmeier, Christoph ; Kalthoff, Norbert ; Barthlott, Christian ; Corsmeier, Ulrich ; van Baelen, Joel ; Behrendt, Andreas ; Behrendt, Rainer ; Blyth, Alan ; Coulter, Richard ; Crewell, Susanne ; di Girolamo, Paolo ; Dorninger, Manfred ; Flamant, Cyrille ; Foken, Thomas ; Hagen, Martin ; Hauck, Christian ; Höller, Hartmut ; Konow, Heike ; Kunz, Michael ; Mahlke, Holger ; Mobbs, Stephen ; Richard, Evelyne ; Steinacker, Reinhold ; Weckwerth, Tammy ; Wieser, Andreas ; Wulfmeyer, Volker:
Mechanisms initiating deep convection over complex terrain during COPS.
In: Meteorologische Zeitschrift.
Bd. 17
(2008)
Heft 6
.
- S. 931-948.
ISSN 1610-1227
Abstract
Precipitating convection in a mountain region of moderate topography is investigated, with particular emphasis on its initiation in response to boundary-layer and mid- and upper-tropospheric forcing mechanisms. The data used in the study are from COPS (Convective and Orographically-induced Precipitation Study) that took place in southwestern Germany and eastern France in the summer of 2007. It is found that the initiation of precipitating convection can be roughly classified as being due to either:(i) surface heating and low-level flow convergence; (ii) surface heating and moisture supply overcoming convective inhibition during latent and/or potential instability; or (iii) mid-tropospheric dynamical processes due to mesoscale convergence lines and forced mean vertical motion. These phenomena have to be adequately represented in models in order to improve quantitative precipitation forecast. Selected COPS cases are analysed and classified into these initiation categories. Although only a subset of COPS data (mainly radiosondes, surface weather stations, radar and satellite data) are used here, it is shown that convective systems are captured in considerable detail by sensor synergy. Convergence lines were observed by Doppler radar in the location where deep convection is triggered several hours later. The results suggest that in many situations, observations of the location and timing of convergence lines will facilitate the nowcasting of convection. Further on, forecasting of the initiation of convection is significantly complicated if advection of potentially convective air masses over changing terrain features plays a major role. The passage of a frontal structure over the Vosges – Rhine valley – Black Forest orography was accompanied by an intermediate suppression of convection over the wide Rhine valley. Further downstream, an intensification of convection was observed over the Black Forest due to differential surface heating, a convergence line, and the flow generated by a gust front.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER64768 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige ProfessorInnen > Professur Mikrometeorologie - Univ.-Prof. Dr. Thomas Foken Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige ProfessorInnen |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 21 Aug 2015 06:49 |
| Letzte Änderung: | 09 Okt 2023 11:05 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/18441 |