Airborne Doppler lidar surface returns data products other than :机载多普勒激光雷达表面返回数据以外的产品.ppt
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1、Airborne Doppler lidar surface returns: data products other than tropospheric winds,G. D. Emmitt and C. OHandley Simpson Weather Associates Charlottesville, VA. Hangzhou, China October, 2002,TODWL: the program (Twin Otter Doppler Wind Lidar),SPAWAR and ONR 35/SBIR Program provided the lidar and supp
2、orted its integration into the CIRPAS Twin Otter IPO has co-funded the lidar adaptation to the Twin Otter. IPO has solely funded the mission planning, flight hours, data collection and the post flight installation of the lidar in a trailer for inter-flight research.,TODWL : the aircraft,Navy Twin Ot
3、ter operated by CIRPAS out of Marina, CA Unpressurized ( 10 ft normal operations) Cruise speeds 100 - 140 kts Equiped with: GPS/INS Dropsonde aerosol probes temperature, water vapor, turbulence sensors,TODWL : the instrument,2m coherent detection 4-6 mJ (330 nsec pulse) 80 Hz water cooled 7-10% tota
4、l system efficiency 10 cm two axis scanner, side door mounted GUI with realtime instrument control and data display Weight: 250lb Power: 1.5 KW,TODWL 2-axis scanner,The Experiments,Airborne missions over various water bodies (open ocean, surf zone, large rivers, lakes and wetlands) in the vicinity o
5、f Monterey, CA Laboratory studies using a water slide to simulate observations at differing incidence angles,Objectives,Check out the operations of an airborne 2m coherent, semi-hemispherical scanned DWL Investigate the utility of water surface returns at 2m for space-based and airborne DWLs (ocean,
6、 lake, river, & wetlands) Compare DWL wind soundings with RAOBs, microwave sounders, met towers, ground-based DWLs and assorted surface observations Investigate the use of an airborne DWL to provide cal/val data for scatterometers and RadarSat Demonstrate the application of LAHDSSA for future space-
7、based DWL missions. Collect aerosol data along with lidar data to assist in the interpretation of signals from the LAS,TODWL sounding looking up (20seconds),TODWL sounding looking down (20 seconds),Microwave sounding Ft Ord (30 minutes),0030 UTC March 2002,Aircraft flight level,Water surface returns
8、 as a function of incidence angle at 2m with a coherent Doppler lidar,Modeled reflectance from ocean surface for a wind speed of 7.5m/s (Tratt, 2002),along wind direction,Cross wind direction,200,400,600,1000,800,1200,1400,1600,Range from aircraft (meters),LAS returns,Water surface returns,Nadir ang
9、le,Relative spectral amplitude (range corrected) using 400 shot integration,TODWL returns collected over Monterey Bay, 12 March 2002,Single shot data used to obtain 400 shot average at 3 degrees off nadir,Water surface,Single shot data used to obtain 400 shot average at 33 degrees off nadir,Water su
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