Abstract
Helsinki Testbed is a research project of mesoscale meteorology. Data from various meteorological sensors including five lidar ceilometers situated in and around Helsinki have been collected since 2005. The ceilometers report attenuated backscatter profiles that have been evaluated in respect of mixing height determination. Two different methods, a gradient method and an idealized backscatter method have been applied for this purpose. Data examples from different meteorological situations are discussed. The enhanced single lens optical concept of the ceilometers improves their ability to detect nocturnal stable layers. Residual layers are visible up to heights exceeding 2500 m. Such layers can also be seen in data from the space-borne lidar CALIOP.
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