Airborne Lidar LEANDRE II for Water-Vapor Profiling in the Troposphere. II. First results.
The airborne lidar LEANDRE II, described in part I [Appl. Opt. 40, 3450-3461 (2001)], has been flown on the French Atmospheric Research Aircraft to perform lower-troposphere (0-3.5-km) measurements of the water-vapor mixing ratio. We present and discuss the method used for retrieval of the water-vapor mixing ratio and analyze systematic and random measurement errors in relation to instrument design and performance. The results of a series of test flights are presented. With a 0.8-km horizontal resolution and a 300-m vertical resolution, the standard deviation of the measurement error ranges from approximately 0.05 g kg(-1) at 3.5 km to 0.3-0.4 g kg(-1) near the ground, in agreement with the predicted random error. Comparisons with dew-point hygrometer measurements show a vertically averaged difference of ?0.15 g kg(-1), approximately equal to the observed water-vapor variability.
Bruneau
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Quaglia
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Flamant
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Pelon
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