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The SOUSY (SOUnding SYstem) radar was relocated to the Jicamarca RadioObservatory (JRO) near Lima, Peru, in 2000, where the radar controller andacquisition system were upgraded with state-of-the-art parts to take fulladvantage of its potential for high-resolution atmospheric sounding. Due toits broad bandwidth (4 MHz), it is able to characterize clear-airbackscattering with high range resolution (37.5 m). A campaign conducted at JRO in July 2014 aimed to characterize the lowertroposphere with a high temporal resolution (8.1 Hz) using the DataHawk (DH)small unmanned aircraft system, which provides in situ atmosphericmeasurements at scales as small as 1 m in the lower troposphere and can beGPS-guided to obtain measurements within the beam of the radar. This was aunique opportunity to make coincident observations by both systems and todirectly compare their in situ and remotely sensed parameters. Because SOUSY only points vertically, it is only possible to retrieve vertical radarprofiles caused by changes in the refractive index within the resolution volume.Turbulent variations due to scattering are described by the structure function parameter of refractive index Cn2. Profiles of Cn2 from the DH are obtained by combining pressure,temperature, and relative humidity measurements along the helical trajectoryand integrated at the same scale as the radar range resolution. Excellentagreement is observed between the Cn2 estimates obtained from the DH andSOUSY in the overlapping measurement regime from 1200 m up to 4200 m abovesea level, and this correspondence provides the first accurate calibration ofthe SOUSY radar for measuring Cn2

annales geophysicae

Simultaneous observations of structure function parameter of refractive index using a high-resolution radar and the DataHawk small airborne measurement system