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SIRTA Site Instrumental de Recherche par Télédétection Atmosphérique

SIRTA Site Instrumental de Recherche par Télédétection Atmosphérique. Martial Haeffelin SIRTA Coordinator CLOUDNET Meeting, Paris May 2002. SIRTA: dedicated to cloud observation. SIRTA Cloud-Aerosol Lidar. Nd-Yag laser ( w 1064 nm, 2 w 532 nm) 200 mJ (100 for 2 w ) per pulse at 20 Hz

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SIRTA Site Instrumental de Recherche par Télédétection Atmosphérique

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  1. SIRTASite Instrumentalde Recherche parTélédétection Atmosphérique Martial Haeffelin SIRTA Coordinator CLOUDNET Meeting, Paris May 2002

  2. SIRTA: dedicated to cloud observation

  3. SIRTA Cloud-Aerosol Lidar • Nd-Yag laser (w 1064 nm, 2w 532 nm) • 200 mJ (100 for 2w) per pulse at 20 Hz • Detection : • 532 nm // and  • 607 nm N2 Raman • 1064 nm • NFOV telescope: 3-20 km • WFOV telescope: 100m - 4 km 9 GHz radar for airplane detection Lidar backscattering coefficient

  4. Operations of Cloud-Aerosol Lidar Goal: reach 100% on 4-day schedule starting Sept 2002

  5. RASTA Cloud Radar • Transmitter: • Frequency: 95 GHz • Peak power: 1.8 kW • Antenna: (vertically pointing) • 1.2 m diameter, 0.2o beamwidth • Sensitivity: -50 dBZ at 1 km • Range: 200-15 km Radar reflectivity

  6. Operations of RASTA Cloud Radar • Ground version ready in Sept 2001 • Failure after a few tests due to problems in the high-voltage components of the Klystron transmitter • Transmitter sent back to manufacturer in Sept 2001 • Due back June 2002 • July-Aug 2002: tests + 2 days/week operational observations • Goal: reach 100% on 4-day schedule starting Sept 2002

  7. 5 GHz Doppler Radar C-band pulsed radar designed to study dynamic and microphysical properties of precipitating and non-precipitating systems in the troposphere • Transmitter: • Frequency : 5.5 GHz • Peak power : 250 kW • Antenna: • Diameter : 4 m • Gain : 44 dBZ at 1 km • Azim. + Elev. scanning • Dual polarization (emission/detection) • Range: 100 km; Resolution: 200 m Goal: Operations during IOPs to provide multi-frequency data and cloud advection data

  8. 10.6mm Doppler Lidar IR Doppler Lidar designed to get 3-D wind profiles in the troposphere and to study turbulence in the boundary layer • Pulsed TE-CO2 laser (10.59 mm) • 150-300 mJ per pulse at 2 Hz • 2-mirror scanning system • Range : 10 km, Resolution: 450 m Goal: Operations during IOPs to provide cloud advection data

  9. DRAKKARMicro-wave Radiometer RESCOM Scanning Micro-wave Radiometer Microwave Radiometers Column integrated measurements of water vapor and liquid vapor in the atmosphere Frequencies: 23.8 and 31.7 GHz DRAKKAR: nadir pointing radiometer RESCOM: scanning radiometer Beam width : DRAK 11-13o; RESC 2o RESC: Calibrated by tip-curve technique DRAK: Calibrated w/ resp. to RESC Continuous observation

  10. Data Archival, Visualisation and Dissemination • Archived data are progressively converted into NetCDF format • Data sorted by instrument (or group) and data level • Automatic quick-look image production under development: • real-time QL for current day • archived QL available for browsing and ordering • Archived data available for ordering through web site: • Data users register with simple login name • Data ordering form allows users to select: • Time range • Instrument data / QL • Data levels • Ordered files are provided on ftp site • SIRTA general website is being redesigned

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