37 Hagen

European Virtual GV Site : 

European Virtual GV Site Martin Hagen Institut für Physik der Atmosphäre DLR Oberpfaffenhofen Germany A. Mugnai, E. Gorgucci, J. Goddard, C. Wilson, D. Sempere Torres, M. Haeffelin, R. Uijlenhoet, M. Schönhuber, H. Russchenberg, J. Koistinen

Europe: 

Europe Various Precipitation Regimes Various National Weather Services Various Research Organizations Various Radar Networks Various Sites suited for Ground Validation ONE AIM: Ground Validation for GPM and EGPM

Precipitation in Europe: 

Precipitation in Europe Seasonal Precipitation Precipitation all over the year High Latitude Snow Extra tropical Baroclinic Mid-Latitude Continental Stratiform Convective Coastal Mountainous Chilbolton Cabouw Bonn Palaiseau Oberpfaffenhofen Rome Catalunya Graz Sodankylä Cevennes- Vivarais

GV in Snow Regions: 

GV in Snow Regions Snow is the dominant precipitation in Northern Scandinavia, The Alps. Accumulated snow is a major resource for fresh water + hydropower throughout all seasons and for wide areas. No previous experience with snow retrieval from TRMM. Scattering properties: Raindrop shape is well (?) known,  = 1 g/cm³ Snow has irregular shape,  = 0.05 – 1 g/cm³ Finland Alps

GPM Validation Strategy: 

GPM Validation Strategy Basic Rainfall Validation Rain gauge networks Radar networks Supersites (Routine Product Site, RPS) Research radar sites, polarimetric radars preferred Enhanced well-calibrated radar networks Field Campaigns (Focused Observational Program, FPO) Research radar sites Aircraft EU / ESA / ... ... projects

Basic rainfall validation: 

Basic rainfall validation Dense rain gauge networks Example: gauges available for the Mesoscale Alpine Project (MAP) Radar networks

Example for radar network: BALTRAD: 

Example for radar network: BALTRAD DBZC Composites of radar reflectivity 2x2 km horizontal resolution 15 minute intervals 0.4 dBZ resolution All available BALTRAD radars Continuous production Example: Convective snow bands More than 30 radars in 11 countries Radar Data Centre at SMHI, Sweden Continuous operation since October 1, 1999

GV Supersites: 

GV Supersites Supersites will be used to support the Routine Product Site (RPS) Program Focused Observational Program (FOP) Interest shown by: (further candidates are expected)

Potential GV Supersites : 

Potential GV Supersites Chilbolton Cabouw Palaiseau Oberpfaffenhofen Catalunya Graz Rome

Instrumentation of Supersites: 

Instrumentation of Supersites The proposed European supersites have excellent instrumentation and are well experienced in the development and operation of the systems and the organization of field campaigns. Radar systems (S, C, X, Ka, W - Band) (Ku ?) co-located systems, some systems are mobile (airborne, truck) Multi-frequency radiometer systems Lidar systems, ceilometers Windprofiler, RASS, Sodar Surface observations Disdrometers, rain gauges Rain gauge networks Operational radio sondes nearby Lightning detection systems Research aircraft ...

Current Networking: 

Current Networking Radar networks and rain gauge networks operated by National weather services, Regional weather services. International Networking through WMO, Network of European weather services EUMETNET, Network of European operational radar systems OPERA. Potential supersites are currently operated by national research organizations, some in cooperation with national weather services. Networking of supersites currently through Common EU projects like CLIWANET, EuroTRMM, CLOUDMAP, ...

Concept of a distributed or virtual Supersite: 

Concept of a distributed or virtual Supersite The concept is based on a networking infrastructure, both physical and organisational. Physical networking consists of the exchange of data, instruments and routines. Exchange of instruments for calibration and intercomparison campaigns. Mobile instruments for focus observation campaigns at any of the existing sites or in other regions of interest. Organisational networking is a structure where the participating site mangers, the national weather services and GPM and EGPM representatives will be presented.

Concept of a distributed or virtual Supersite: 

Concept of a distributed or virtual Supersite A distributed or virtual »supersite« will consist of: Supersites in different countries, National weather radar networks. Benefits of a distributed or virtual supersite: Synergy through different instrument set-up. Sites have different scientific background. Economic benefits, reduction of costs. Supersites will also allow for the assessment of the error structure of operational radar networks. Recommendations for radar – gauge adjustment by weather services and users.

Concept of a distributed or virtual Supersite: 

Concept of a distributed or virtual Supersite The concept of a distributed or virtual supersite will increase the observational area and thus increasing the number of satellite overpasses for various regions and precipitation systems. Through the networking activities it will be possible to provide a maximum of information even though not all sites are fully instrumented.

Next steps: 

Next steps Definition of a network of ground validation sites (in close cooperation with the EurAt consortium) Exchange of site and instrumentation information. Introduce GPM/EGPM ground validation to EUMETNET (network of European weather services) Access to rain gauge networks, Support for additional surface data. Introduce GPM/EGPM ground validation to OPERA (network of European weather services for radar operation) Access to operational radar data.