CloudNet: TARA status and database H. Russchenberg, O. Krasnov Delft University of Technology – IRCTR, The Netherlands

TARA current status It is working… Starting August 18, 2004: 1 min 1 hour RAW data – 1 ms sweeps sec moments of Doppler spectrum – Z, V, W Calibrated, net CDF format Range resolution: 30 m Doppler velocity ± 22 m/sec CLOUDNET product: 30 sec averaged Z,V,W data after application cloud mask

15° B0 - Full polarimetry beam B1 - One polarization beam B2 - One polarization beam 3D wind mode for TARA 5 x 1-msec sweeps sequence: B0 HH – B0 HV – B0 VV – B1 – B2 repeats N times to form Doppler spectra in all channels Output: Standard products as it is now 3D wind field Polarimetric information November - December 2004, first experimental campaign

2002 January February March April May June July August September October November December January February March April May June July August September October November December January February March April May June July August September October November December January February March April May June July August September October November December … … … … … … … … … … Total86Total260 Total298Total34 (?) TARA database status On KNMI CloudNet FTP server

LWC retrievals using radar - lidar algorithm NetCDF YYYYMMDD_site_LWC_Radar_lidar_method.nc : Common variables - time, height, latitude, longitude, altitude, radar frequency, global attributes. 2D arrays –optical extinction, –radar reflectivity to optical extinction ratio Time series of lidar’s optical depth Retrievals: –Used for retrieval Z/  and Z thresholds, –2D liquid water categorization map and LWC array, –time series of retrieved LWP (for the different Z-LWC relations)

liquid_water_map_bits Bit 0 - Reading's categorization product recognized pixel as water ((small droplets OR water precipitation) AND Temperature > 0C]) Bit 1 - radar signal presented Bit 2 - lidar signal (extinction) presented Bit 3 - radar reflectivity to lidar extinction presented Bit 4 - atmospheric water, class 1 - "water cloud without drizzle" Bit 5 - atmospheric water, class 2 - "water cloud with light drizzle" Bit 6 - atmospheric water, class 3 - "water cloud with heavy drizzle"

May 19, 2003, Cabauw