SIRTA Site Instrumental de Recherche par Télédétection Atmosphérique Martial Haeffelin SIRTA Coordinator CLOUDNET Meeting, Paris May 2002

LIDARBackscattering Lidar (532 w/ polar., 607, 1064 nm)Clouds, aerosols (100m-20km)1993 Scanning Coherent Doppler Lidar (10.6  m) 3D wind fields1999 Backscattering Lidar (316 nm)Ozone, aerosols1999 Raman Lidar (355 nm)Water vapor profile2002 RADARDoppler Radar (94 GHz), dev. of polarization 2002Clouds2001 Doppler Radar (5 GHz)Precipitation, 3D wind1999 RADIO- METER Pyranometer pyrgeometer dev. BSRN station 2002Radiative fluxes1993 AERONET Sun-Photometer (8 channels)Aerosol properties, water vapor content1999 Infrared imager (ground version of CALIPSO)Brightness temperature2002 Scanning micro-wave radiometer ( GHz)Water content (liquid + vapor)1999 IN-SITUWeather stationPressure, Temperature, Humidity (PTH)1996 Radio-sondes from Météo-France (15km from site)PTH vertical profile1999 Sonic anemometerTurbulent fluxes2002 Spectro-pluviometerDrop radius + velocity1999 SIRTA: dedicated to cloud observation

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

Aug-Dec 2001Jan-May 2002 Days of operation / month Inclement weather/month (on days of operation) Maintenance 2.0 Rate of success for 2-day schedule (Mon, Thu) >100% Rate of success for 4-day schedule (Mon-Thu) 60%75% Operations of Cloud-Aerosol Lidar Goal: reach 100% on 4-day schedule starting Sept 2002

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

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

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

10.6  m 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  m) 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

DRAKKAR Micro-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 o ; RESC 2 o RESC: Calibrated by tip-curve technique DRAK: Calibrated w/ resp. to RESC Continuous observation

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