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Observation of convection initiation processes with a suite of state-of-the-art research instruments during COPS IOP 8b

Behrendt, Andreas and Pal, S. and Aoshima, F. and Bender, M. and Blyth, A. and Corsmeier, U. and Cuesta, J. and Dick, G. and Dorninger, M and Flamant, Cyrille and Di Girolamo, P. and Gorgas, T. and Huang, Y. and Kalthoff, N. and Wieser, Andreas and Wulfmeyer, V. and Khodayar, S. and Mannstein,, H. and Träumner, K. (2011) Observation of convection initiation processes with a suite of state-of-the-art research instruments during COPS IOP 8b. Quarterly Journal of the Royal Meteorological Society, 137, pp. 81-100. DOI: 10.1002/qj.758.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.758/abstract

Abstract

In the afternoon of15 July 2007, a thunderstormwas initiatedwithin a line ofcumulus clouds which formed parallel to the crest of the Black Forest mountains during the Intensive Observation Period (IOP) 8b of the Convective and Orographicallyinduced Precipitation Study (COPS). This paper extends the analysis of processes that led to convection initiation (CI), i.e. the transition from shallow to deep convection, on this day with the data from several COPS instruments that have not been considered in previous studies. In particular, the boundary-layer structure, lids and the water-vapour field in the pre-convective environment of the event are discussed. For this purpose, we investigated measurements of water-vapour lidars, temperature lidars and wind lidars, profiles from radiosondes, in situ aircraft data and gridded data of weather stations as well as GPS integrated-water-vapour data and satellite imagery. Thermally driven circulation systems formed over both the Black Forest and the Vosges mountain ranges which resulted in local convergence zones. These superimposed with the large-scale convergence in the Black Forest area. In the presence of sufficient moisture and updraught, clouds formed close to the mountain crests. The related latent-heat release allowed larger thermals to be produced, which may have had a positive feedback on stabilizing these convergence zones as a whole. We believe that differences in the moisture field explain why convection remained shallow and sparse over the Vosges mountains because these differences were responsible for differences in convective inhibition (CIN). The stationary location of the convergence zone over the southern Black Forest was probably decisive for CI because it constantly transported sensible and latent heat into the area inwhich CI took place.

Document Type:Article
Title:Observation of convection initiation processes with a suite of state-of-the-art research instruments during COPS IOP 8b
Authors:
AuthorsInstitution or Email of Authors
Behrendt, AndreasUniv. Hohenheim, Hohenheim
Pal, S.UNSPECIFIED
Aoshima, F.UNSPECIFIED
Bender, M.UNSPECIFIED
Blyth, A.UNSPECIFIED
Corsmeier, U.UNSPECIFIED
Cuesta, J.UNSPECIFIED
Dick, G.UNSPECIFIED
Dorninger, MUNSPECIFIED
Flamant, CyrilleUNSPECIFIED
Di Girolamo, P.UNSPECIFIED
Gorgas, T.UNSPECIFIED
Huang, Y.UNSPECIFIED
Kalthoff, N.UNSPECIFIED
Wieser, AndreasUNSPECIFIED
Wulfmeyer, V.UNSPECIFIED
Khodayar, S.UNSPECIFIED
Mannstein,, H.UNSPECIFIED
Träumner, K.UNSPECIFIED
Date:2011
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:137
DOI:10.1002/qj.758
Page Range:pp. 81-100
Status:Published
Keywords:convection, orography, precipitation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Jana Freund
Deposited On:13 May 2011 15:28
Last Modified:12 Dec 2013 21:17

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