1. LIDAR network F.Fierli, C. Flamant, F. Cairo

2. Scientific Task for SOP ● provide the aerosol content before convection episodes to improve the estimate of aerosol impact on convection ● provide measurement of cirrus clouds, remnants from convective activity or in-situ formed ● provide an optimal set of observations for improving the knowledge of the heat low dynamics, including its diurnal evolution and aerosol radiative forcing,

3. What can be inferred form the data? ● The lidars deployed in AMMA have in common the 532 nm backscatter ● Height and time evolution of the PBL ● Presence of aerosol layers ● Rough information on the aerosol type (biomass vs mineral) ● Presence/evolution of Cirrus

4. Bani Cinzana Tamanrasset + + Cinzana = Lidar Site + = Airport Tamanrasset M'Bour Djougou Niamey

5. MPL 532 nm backscatter 24 hours data (Niamey) Aerosol Cirrus PBL Blind below 1 km

6. DUST LIDAR network (CNR-ISAC, ENEA, LISA) Bani, Cinzana, M’Bour Implemented in Jan 2006, operative Jan Feb 2006 with two meas/day in automatic mode. Stopped in March. Maintenance in May, operative for SOP. 532 Bkr and dep lidar in Cinzana

7. What is TReSS? TReSS is an autonomous and high-performance system designed to observe radiative and structural properties of clouds and aerosol layers, as well as atmospheric boudary layer dynamics. The standard payload is made of the following instruments: 1) a multi-wavelength elastic backscatter Mini-Lidar operating at 532 and 1064 nm (with diverse polarization capability at 532 nm), 2) a sun-photometer, 3) an IR radiometer, 3) a full sky visible channel web-type camera. For the AMMA SOP period, the platform capability will be enhanced with: an Optical Depth Sensor (for daytime and nighttime measurements), a CLIMAT radiometer a sonic anemometer a GRIMM for size distribution measurements a nephelometer operating at 880 nm filters for chemical speciation (in collaboration with LISA) The above instrumentation will also be enhanced by the measurements conducted routinely by the Météo Algérienne: balloon soundings (x4 during the SOP), surface Meteorological measurements, radiative measurements, ozone integrated column

8. Status of implementation The multi-wavelength backscatter Mini-Lidar  seriously damaged during transportation between Algers and Tamanrasset New laser and new telescope are needed!! Replacement scheduled for SOP 1a Sun-photometer  operational since 16/02/06 (data transmitted to AERONET and available on the web) CLIMAT radiometer  operational since 17/02/06 (data transmitted to M. Legrand at LOA via internet) Sonic anemometer  operational since 18/02/06 (installed on 10 m mast) Size distribution measurements  operational since 18/02/06 Failure Operational

9. Status of implementation Full sky visible channel web-type camera IR radiometer Nephelometer Tested / will be running during lidar operations Optical Depth Sensor (for daytime and nighttime measurements) Filters for chemical speciation To be installed / tested (before SOP 1a)  IOPs: Day J: continuous Days J-1 & J+1: continuous ??  Outside IOPs: 4 h around 12 z (flexible)

10. Lidar Network: availability for SOP ● Niamey, MPL, ARM mobile station (24h, 532 nm Backscatter) ● Bani, CNR, Microlidar (automatic, 2profiles/day 532, 1064 nm Backscatter and depolarization) ● Cinzana, CNR, Microlidar (automatic, 2 profiles/day, 532 nm Backscatter) ● Djougou, IPSL, Mini-Lidar CIMEL (operated, 532 nm backscatter) ● Tamanrasset, IPSL, Lidar

11. Conclusions ● 5 lidar systems around the target region and 2 systems near the Niamey airport ● Different operating modes and retrieved variables ● Bani enhanced operation. Could it be ensured ● Cinzana will work as EOP instrument ● Djougou operator should be confirmed ● Need communication to switch to enhanced mode during IOP