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The dependence of convection-related parameters on surface and boundary-layer conditions over complex terrain

Titelangaben

Kalthoff, Norbert ; Kohler, M. ; Barthlott, Christian ; Adler, B. ; Mobbs, Stephen ; Corsmeier, Ulrich ; Träumner, K. ; Foken, Thomas ; Eigenmann, Rafael ; Krauss, Liane ; Khodayar, S. ; di Girolamo, Paolo:
The dependence of convection-related parameters on surface and boundary-layer conditions over complex terrain.
In: Quarterly Journal of the Royal Meteorological Society. Bd. 137 (Januar 2011) Heft S1 . - S. 70-80.
ISSN 1477-870X
DOI: https://doi.org/10.1002/qj.686

Abstract

The field campaign ‘Convective and Orographically-induced Precipitation Study’ (COPS) was performed in south-western Germany and eastern France in summer 2007. Within the COPS context this study focused on the process chain of soil moisture, surface fluxes, conditions of the convective boundary layer (CBL), and convection-related parameters. The results were different for valley and mountain sites. Only in the Rhine valley did the ratios of sensible and latent heat to the net radiation at the surface, H0/Q0 and E0/Q0 respectively, reveal a weak dependence on soil moisture. H0/Q0 was lower and E0/Q0 was higher at higher soil moisture. The correlation of the diurnal increase of the equivalent potential temperature,Θe, with the energy supplied by H0 and E0 was found to be lower for higher surface inhomogeneity. Furthermore, only a weak dependence of the CBL depth on the sensible surface heat flux was found for valley sites and was non-existent for the mountain crest. The convective indices in the whole COPS domain were found to depend on Θe in the CBL. The absolute values of conditional and potential instability are not necessarily the decisive parameters for convection to occur, because highest instabilitywas observed in the Rhine valley while convection was preferably initiated over the mountains. Convective inhibition (CIN) was positively correlated with the capping strength and negatively with the CBL height: the higher the CBL, the lower the upper threshold of CIN. The frequency of low CIN was higher in the Black Forest mountains than in the Rhine valley, which facilitates convection initiation over the mountain sites.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER86194
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige Professoren
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige Professoren > Professur Mikrometeorologie - Univ.-Prof. Dr. Thomas Foken
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 13 Aug 2015 06:11
Letzte Änderung: 02 Okt 2018 07:37
URI: https://eref.uni-bayreuth.de/id/eprint/17943