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Radar climatology of the COPS region

Weckwerth, Tammy M. and Wilson, James W. and Hagen, Martin and Emerson, Tracy J. and Pinto, James O. and Rifea, Daran L. and Grebe, Leslie (2011) Radar climatology of the COPS region. Quarterly Journal of the Royal Meteorological Society, 137, pp. 31-41. DOI: 10.1002/qj.747.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.747/abstract

Abstract

A climatology of convection initiation (CI) and convective enhancements (CE) has been developed using radar reflectivity data in southwestern Germany and eastern France over the period of May�August of 2000�2006 and 2008. The study region included the Vosges Mountains of France, the Rhine Valley which straddles France and Germany, the Black ForestMountains and the SwabianMountains of Germany. Convection occurred frequently during the summer months throughout the study region. The CI density (number of initiations per square km) illustrates preferential formation in the mountain regions while the CE events spanned both mountains and valleys nearly equally. There is a strongmid-day peak of the CI events suggesting that diurnal heating is critical for CI in the region. The very strong thunderstorms (>46 dBZ) first occurred in the mountains and �2 h later in the Rhine Valley. During the summer of 2007, the Convective and Orographically-induced Precipitation Study (COPS) field campaign was conducted with the objective of obtaining improved understanding of convective processes and short-term quantitative precipitation forecasting in low-mountain regions. Comparisons were made between the radar climatology results and the COPS summer. The COPS summer exhibited preferential CI density in the mountainous regions but not as pronounced as the climatology. The COPS summer had a similar diurnal peak of CI events as climatology but the ratio of daytime to nighttime CI (1.7), or amplitude of the diurnal cycle, was less than that of climatology (3.0). While both the 8-year climatology and COPS summer were dominated by daytime, locally-forced CI occurrences, the broad distribution of daytime CI events and increase in nighttime events observed during COPS indicate a more active synoptic pattern in 2007.

Document Type:Article
Title:Radar climatology of the COPS region
Authors:
AuthorsInstitution or Email of Authors
Weckwerth, Tammy M.NCAR, Boulder, CO, USA
Wilson, James W.NCAR, Boulder, CO, USA
Hagen, Martinmartin.hagen@dlr.de
Emerson, Tracy J.NCAR, Boulder, CO, USA
Pinto, James O.NCAR, Boulder, CO, USA
Rifea, Daran L.NCAR, Boulder, CO, USA
Grebe, LeslieDLR
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.747
Page Range:pp. 31-41
Status:Published
Keywords:weather radar, orographic thunderstorm, climatology
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 > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:13 May 2011 11:58
Last Modified:12 Dec 2013 21:17

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