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Mechanisms initiating deep convection over complex terrain during COPS

Kottmeier, Christoph und Kalthoff, Norbert und Barthlott, Christian und Corsmeier, Ulrich und van Baelen, Joël und Behrendt, Andreas und Behrendt, Rainer und Blyth, Alan und Coulter, Richard und Crewell, Susanne und di Girolamo, Paolo und Dorninger, Manfred und Flamant, Cyrille und Foken, Thomas und Hagen, Martin und Hauck, Christian und Höller, Hartmut und Konow, Heike und Kunz, Michael und Mahlke, Holger und Mobbs, Stephen und Richard, Evelyne und Steinacker, Reinhold und Weckwerth, Tammy und Wieser, Andreas und Wulfmeyer, Volker (2008) Mechanisms initiating deep convection over complex terrain during COPS. Meteorologische Zeitschrift, 17, Seiten 931-948. DOI: 10.1127/0941-2948/2008/0348.

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Mechanisms initiating deep convection over complex terrain during COPS
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kottmeier, ChristophKIT, Karlsruhe
Kalthoff, NorbertUBP/CNRS, F
Barthlott, ChristianKIT, Karlsruhe
Corsmeier, UlrichKIT, Karlsruhe
van Baelen, JoëlUBP/CNRS, F
Behrendt, AndreasUniv. Hohenheim, Hohenheim
Behrendt, RainerHessischer Rundfunk, Frankfurt
Blyth, AlanNCAS, Leeds, UK
Coulter, RichardArgonne National Lab., Argonne, USA
Crewell, SusanneUniv. zu Köln, Köln
di Girolamo, PaoloUniv. degli Studi della Basilicata, Potenza, I
Dorninger, ManfredUniv. Wien, Wien, A
Flamant, CyrilleUniv. Pierre et Marie Curie, Paris, F
Foken, ThomasUniv. Bayreuth, Bayreuth
Hagen, MartinNICHT SPEZIFIZIERT
Hauck, ChristianKIT, Karlsruhe
Höller, HartmutNICHT SPEZIFIZIERT
Konow, HeikeKIT, Karlsruhe
Kunz, MichaelKIT, Karlsruhe
Mahlke, HolgerKIT, Karlsruhe
Mobbs, StephenNCAS, Leeds, UK
Richard, EvelyneUniv. de Toulouse, F
Steinacker, ReinholdUniv. Wien, Wien, A
Weckwerth, TammyNCAR, Boulder, USA
Wieser, AndreasKIT, Karlsruhe
Wulfmeyer, VolkerUniv. Hohenheim, Hohenheim
Datum:2008
Erschienen in:Meteorologische Zeitschrift
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:17
DOI :10.1127/0941-2948/2008/0348
Seitenbereich:Seiten 931-948
Status:veröffentlicht
Stichwörter:convection, orography, precipitation
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Jana Freund
Hinterlegt am:12 Jan 2009
Letzte Änderung:20 Okt 2014 14:33

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