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Abstract
Caeli is the CESAR Water Vapour, Aerosol and Cloud Lidar and is a multiwavelength, high-performance Raman lidar, capable of providing round-the-clock measurements. It is deployed at the Cabauw Experimental Site for Atmospheric Research (CESAR) in the Netherlands (51°58.2' N, 4° 55.6' E). The instrument was developed as a key instrument for CESAR to strengthen the sites capabilities as a profiling station for atmospheric research and climate studies. Next to the lidar, other profiling techniques are also routinely operated providing synergy in observations.
Caeli has contributed to several observation programmes and studies. In particular, the instrument is part of EARLINET, has provided data during the IMPACT campaign and provides correlative measurements for CALIPSO. Recently, the instrument was compared to its peers in the EARLINET Reference Lidar Intercomparison (EARLI09) in Leipzig. This paper describes the Caeli instrument configuration and shows examples of application of the data. Also, preliminary intercomparison results will be shown from EARLI09.