Abstract : D.2
First results of the field campaign COPS

Volker Wulfmeyer, Andreas Behrendt, Christoph Kottmeier, Ulrich Corsmeier, Gerhard Adrian, Alan Blyth, George Craig, Ulrich Schumann, Hans Volkert, Susanne Crewell, Paolo Di Girolamo, Cyrille Flamant, Mark Miller, Stephen Mobbs, Evelyne Richard, Mathias Rotach, Marco Arpagaus, Herman Russchenberg, Peter Schluessel, Marianne Koenig, Volker Gaertner, Reinhold Steinacker, Dave Turner, Tammy Weckwerth
Institute of Physics and Meteorology (IPM)

The Convective and Orographically-induced Precipitation Study (COPS, www.uni-hohenheim.de/cops) is an international field experiment being performed from June 1 - August 31, 2007, in south-western Germany and eastern France. The overarching science goal is to advance the quality of forecasts of orographically-induced convective precipitation by 4D observations and modeling of its life cycle.

COPS is a component of the German Priority Program "Praecipitationis Quantitativae Predictio" (PQP, http://www.meteo.uni-bonn.de/projekte/SPPMeteo/) and has been endorsed as World Weather Research Program (WWRP) Research and Development Project (RDP). It is coordinated with the first summertime European THORPEX Regional Campaign (ETReC07) and the WWRP Forecast Demonstration Project (FDP) Demonstration of Probabilistic Hydrological and Atmospheric Simulation of flood Events in the Alpine region (D-PHASE) (www.map.meteoswiss.ch/map-doc/dphase/dphase_info.htm). During COPS, a synergy of state-of-the-art remote sensing and in-situ measurement systems will be operated. At five so-called Supersites, this synergy shall be used to observe the chain of processes leading to the development of precipitation from the clear-air pre-convective environment, to the initial of convection, to the development and organization of clouds. Existing networks of standard meteorological, turbulence and energy balance, soil moisture, and GPS sensors will be densified during the campaign. To close remaining gaps between and to extend the coverage of ground-based observations, airborne instruments on nine platforms will be operated.

Strong support is provided by coordinating COPS with the project TRACKS of German Helmholtz Centers (www.fzk.imk.uni-karlsruhe.de/english/seite_417.php). A highlight is the operation of the Atmospheric Radiation Measurement (ARM) Program Mobile Facility (AMF, www.arm.gov/amf/blackforest) at one of the Supersites from April 2 - December 31, 2007.

After a short description of the observation strategy, first results are presented. It will be discussed how the combination of synergetic observations, high-resolution models, and data assimilation techniques will be used to address the COPS science topics. These include the relative role of small-scale/large-scale processes for convection initiation in low-mountain ranges and the limits of predictability of convective precipitation.