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The atmospheric science community demands autonomous and quality-assuredvertically resolved measurements of aerosol and cloud properties. For thispurpose, a portable lidar called Polly was developed at TROPOS in 2003. Thelidar system was continuously improved with gained experience from the EARLINET community, involvement inworldwide field campaigns, and international institute collaborations within the last10 years. Here we present recent changes of the setup of the portablemultiwavelength Raman and polarization lidar Polly<sup>XT</sup> anddiscuss the improved capabilities of the system by means of a case study. The latest system developments include an additional near-range receiver unit for Ramanmeasurements of the backscatter and extinction coefficient down to 120 mabove ground, a water-vapor channel, and channels for simultaneousmeasurements of the particle linear depolarization ratio at 355 and 532 nm.Quality improvements were achieved by systematically following the EARLINETguidelines and the international PollyNET quality assurance developments. A modified ship radar ensures measurementsin agreement with air-traffic safety regulations and allows for 24∕7 monitoringof the atmospheric state with Polly<sup>XT</sup>

The automated multiwavelength Raman polarization and water-vapor lidar Polly&lt;sup&gt;XT&lt;/sup&gt;: the neXT generation

The automated multiwavelength Raman polarization and water-vapor lidar Polly<sup>XT</sup>: the neXT generation