Henk Klein Baltink Atmospheric Research Section

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Presentation transcript:

Henk Klein Baltink Atmospheric Research Section BBC2 radar data 24-05-2003 Henk Klein Baltink Atmospheric Research Section

CloudNET Workshop Toulouse Outline intercomparison 3 radars on 2003-05-24, BBC2 intercomparison 3 radars on 2001-08-03, BBC1 some issues 35 GHz cloudradar: power loss operational modes cloud mask 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse 24th May 2003 3 RADARS: MIRACLE (30 m range gate, 5 sec. average profile, ~20 dB offset) TARA (30 m range gate, 5 sec average profile) KNMI RADAR (90 m range gate, 15 sec combined profile) period: 7:40 - 9:50 UTC 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse loss of signal due to raindrops on antenna(?) artefact of mode merging ice clouds (mixed?) 35 GHz Cloudradar data melting layer precip water clouds insects rain at surface 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse 24th May 2003 7:40 – 9:50 UTC 35 GHz MIRACLE TARA CT75 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse Profiles @ 7:50 and 8:15 reflectivity velocity spectral width 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse Vertical Velocity Reflectivity Ice cloud 2001-8-3 BBC1 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse research issues: calibration of radars (BBC2/COST720) velocity offset 35 GHz? differences in coded / uncoded mode (dBZ, width)? 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse 35 GHz radar issues power loss operational modes cloud mask 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse power loss 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse modes 35 GHz (acquisition cycle) 5000 10000 20 s BBC1 16 s After BBC1 acquisition processing Height uncoded coded coded X-pol 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse cloud mask based on Clothiaux et al. 1995 (5x5 pixels) too many small clouds are masked 20/21 October 2003 CloudNET Workshop Toulouse

CloudNET Workshop Toulouse to do next months: analyse BBC1 and BBC2 data (analysis other datasets with multiple radar?) improve: mode merging cloud mask insect removal 20/21 October 2003 CloudNET Workshop Toulouse